WO2024188434A1

WO2024188434A1 - Hybrid heat pump frame kit with side panels

Info

Publication number: WO2024188434A1
Application number: PCT/EP2023/056223
Authority: WO
Inventors: Francesco ROBERTI VITTORY; Alberto PIVOTTO; Omar LUNARDON
Original assignee: Bdr Thermea Group B.V.
Priority date: 2023-03-10
Filing date: 2023-03-10
Publication date: 2024-09-19

Abstract

The invention relates to a heat pump frame kit (1) for a hybrid energy transformation device (600), the heat pump frame kit (1) comprising a frame (2) for connecting the heat pump frame kit (1) to a wall and to a boiler unit (500), boiler unit (500), in particular a boiler frame kit (100), and a heat exchanger (9) for heat exchange between a refrigerant of a heat pump unit (200) and a load circuit (300) and wherein the heat pump frame kit (1) comprises side panels (6) which are configured to be attached to the frame (2) in an operational state of the heat pump support frame kit (1) and are configured to be opened or removed from the heat pump support frame kit (1) in a maintenance state.

Description

HYBRID HEAT PUMP FRAME KIT WITH SIDE PANELS

The invention relates to a heat pump frame kit. The invention further relates to a boiler frame kit, a hybrid energy transformation device and an energy system. The invention further relates to the use of such a heat pump frame kit and/or boiler frame kit. The invention further relates to a method of maintaining a hybrid energy transformation device.

Heat pumps become more and more popular for heating and/or cooling of houses, more and more also in addition to a boiler. Using a heat pump alongside a boiler is referred to as a ‘hybrid heat pump’. In other words, this term refers to an energy transfer system that uses a heat pump alongside a further heat source. Typically, it describes fitting a heat pump alongside a natural gas, LPG or oil boiler. Systems comprising a common boiler and a common heat pump require additional installation space. This installation space is not always available, in particular in cases where an already existing boiler needs to be replaced.

In order to reduce the needed installation space for such hybrid heat pump system, more recent hybrid heat pump systems comprise a heat pump unit, an out-door unit, and a boiler unit in one compact system, sometimes referred to as a complete hybrid heat pump product. Such a complete hybrid heat pump product is designed for a cooperation of the individual units in the system, which are easy to transport and install such a compact system. These compact systems allow that the components of the units can be accessed from the front of the system. These known complete hybrid heat pump products are configured to determine cheap and energy-efficient heating modes depending on the internal heating demand, energy prices and out-door temperatures. The complete hybrid heat pump product according to the prior art, comprising a heat pump unit with a heat exchanger, an out-door unit, and a boiler unit in one compact system comprises a load line of the heat pump unit and a load line of the boiler unit, which are directly fluidically connected via a T-piece to the load connector to the load circuit for a central heating. This has the disadvantage of recirculation. In other words, for example hot water enters the heat pump unit or in the boiler unit instead of to the load circuit.

In addition, the parts of the known complete hybrid heat pump products are only accessible during maintenance via the front of the complete hybrid heat pump product. In a limited and poorly accessible installation space, this means that an installer, who needs to access the heat pump has to work at least partially behind the boiler parts, which leads to longer maintenance service times and reduced comfort for the installer.

The object of the invention is therefore, to constructively facilitate the easy and safe installation and connection of hybrid heat pump systems and of their components wherein and wherein relevant components of the heat pump unit are easily accessible during maintenance or servicing.

The object of the invention is therefore, to facilitate the easy and safe installation and connection of hybrid heat pump systems and of their components wherein the installation and connection does not require specific refrigeration system training of the installer and wherein relevant components of the heat pump unit are easily accessible during maintenance.

The object is solved by a heat pump frame kit for a hybrid energy transformation device, the heat pump frame kit comprising a frame for connecting the heat pump frame kit to a wall and to a boiler unit, in particular a boiler frame kit as described below, and a heat exchanger for heat exchange between a refrigerant of a heat pump unit and a load circuit and wherein the heat pump frame kit (1 ) comprises side panels (6) which are configured to be attached to the frame (2) in an operational state of the heat pump support frame kit (1 ) and are configured to be opened or removed from the heat pump support frame kit (1 ) in a maintenance state.

The heat pump frame kit according to the invention allows for a constructively easy access to the heat pump frame kit parts during maintenance without requiring access from the front. The installation and connection of the heat pump frame kit to provide a hybrid energy transformation device and of its components is constructively easy and safe.

The heat pump frame kit is to be connected to the wall and the boiler unit is to be connected to the heat pump frame kit such that the heat pump frame kit is in between the wall and the boiler unit. The heat pump frame kit allows to install and connect a heat pump unit and a boiler unit to form a hybrid energy transfer system in a standardized, easy manner, reducing the chance of errors.

The boiler unit uses fuel, which may be oil, natural gas, propane, hydrogen or a mixture of hydrogen and another fuel, such as natural gas or propane. The boiler unit comprises a burner, a burner chamber and a heat exchanger and can comprise valves, at least one control unit, a control panel and an expansion valve.

In the operational state the side panels cover the inside of the heat pump frame kit and close off the inside of the heat pump frame kit to prevent accidental access of by-passers or dust. At least one side panel, in particular two side panels can be removed or opened to provide access to the inside of the heat pump frame kit. This allows maintenance personnel to access the heat pump frame kit without the need to remove the boiler unit and/or the boiler frame kit. Depending on the circumstances, the maintenance personnel may access from one side or the other side. In case one side panel can be removed for servicing of components of the heat pump frame kit, the heat pump frame kit according to the invention can be provided selectively accessible from the left-hand side or the right-hand side in an installation position.

According to an embodiment the heat pump frame kit comprises two side panels, in particular a right-hand side panel and a left-hand side panel.

The side panels are provided at opposite sides of the heat pump frame kit to shield the interior of the heat pump frame kit comprising the distributor and other components, like the deaerator, the pump, the supply pipe, diverting valve. In particular, the side panels can be opposite to each other regarding a plane comprising the central body axis of the heat pump frame kit. The side panels refer to the sides of the heat pump frame kit that are covered by the wall or the boiler unit when the heat pump coupling panel is connected to the wall and the boiler unit.

According to an embodiment the side panels can comprise at least one of steel, aluminium, a polymeric, in particular a thermoplastic material, and a composite material or can be made of steel, aluminium, a polymeric, in particular a thermoplastic material, and a composite material. Steel provides the side panels with strength. The aluminium, the polymeric, in particular the thermoplastic material, and the composite material may be used to reduce the noise generated by the heat pump coupling frame kit and the boiler unit and reduce the weight of the respective unit.

A further disadvantage of known complete hybrid heat pump systems is recirculation. In other words, for example hot water enters the heat pump unit or in the boiler unit instead of to the load circuit.

According to an embodiment the heat pump frame kit comprises a distributor arranged within a volume delimited by the frame, in particular connected to the frame, and fluidically connected to the heat exchanger, wherein the distributor comprises at least one load connector set for connecting a cavity of the distributor with at least one load circuit of an energy system.

The distributor is a hydronic or hydraulic distributor by means of which a liquid, in particular water, as an energy carrier is distributed between the heat pump unit and/or boiler on one side and at least one load circuit on the other side. The terms hydraulic and hydronic are used as synonymously. The term is used in this application to mean a liquid, in particular a liquid aqueous system, in particular water, as a heat-transfer medium in heating and/or cooling system, as also the term hydraulic is used in the field of heating and cooling for such a heat-transfer medium system, the terms are used synonymously in this application. The distributor is fluidly connected with a heat pump unit and a boiler unit to receive water from the heat pump unit and the boiler unit that is to be distributed to the one or more load circuits of the energy system.

The heat pump frame kit according to the invention thereby further allows for the reduction or even avoidance of recirculation in the hybrid energy transfer system.

The heat pump frame kit can be fluidically connected to a heat pump unit. The heat pump unit can be a split heat pump. Further the heat pump can be an air source heat pump or ground source heat pump.

Another advantage of the heat pump frame kit to an existing heat pump unit and/or boiler unit in an existing installation is constructively easy and safe. The heat exchanger may be a refrigerant-destination medium heat exchanger. The destination medium may be water to be cycled through a load circuit. The refrigerant is a medium used by the heat pump unit to transfer heat. The heat exchanger is fluidly connected to and part of a refrigerant circulation system to receive warmed (or cooled) refrigerant for warming (or cooling) water. The received refrigerant is used in the heat exchanger to warm (or cool) water. The heat exchanger is also fluidly connected to and part of the refrigeration circulation system to discharge refrigerant from the heat exchanger. The discharged refrigerant is used in the remainder of the refrigerant circulation system to be reheated (or re-cooled). The refrigerant circulation system is part of the heat pump unit.

Hence, the at least one load connector set of the distributor connects a cavity of the distributor to at least one load circuit of an energy system via a first connector of the load connector set directly and via a second connector of the load connector set indirectly via the heat exchanger.

The heat exchanger comprises at least one heat pump connector set for a heat pump unit. The distributor comprises at least one boiler connector set for a boiler unit.

The term connector set is used to refer to a set of connectors, comprising at least one connector functioning as a fluid outlet from the distributor and one corresponding connector functioning as a fluid inlet to the distributor. Connector sets may be provided as pairs. More generally, connectors sets may also comprise one or more connector functioning as a fluid outlet from the distributor and one or more corresponding connectors functioning as a fluid inlet to the distributor.

The load connector set, in particular for connecting the distributor with a central heating circuit, may be arranged at a standard distance from the wall (or the parts of the heat pump frame kit to be positioned against the wall, i.e. the back panel(s)) and at a standard mutual distance relative to each other, i.e. the first connector of a set and the second connector of a set are at a standard mutual distance relative to each other. The distances are all measured from the centre point of the connectors. The distance from the wall may be in the range of 70 - 80 mm, for instance 60 mm. The mutual distance may be in the range of 60 - 70 mm, for instance 75 mm.

According to an embodiment the heat pump frame kit comprises a set of coupling elements to fluidically connect a first boiler connector set to a first load circuit. The coupling elements may be hollow members which each are on one end configured to be connected to a first boiler connector set (via suitable piping) and which each are on the other end configured to be connected to a first load circuit. The first load circuit may be a domestic heat water circuit, comprising a heat exchanger in which the warm water received from the boiler unit and passed on to the first load circuit is allowed to exchange heat with the actual domestic water. The coupling element establish a direct connection between the boiler unit and the first load circuit.

The heat pump frame kit may comprise a second boiler connector set, configured to fluidically connect the boiler unit to the distributor. Via the second boiler connector set the distributor is fluidly connected to the boiler unit to receive warmed water from the boiler unit and to discharge water from the distributor to the boiler unit to be heated by the boiler unit.

According to an embodiment the heat pump frame kit comprises a jig, the jig holds

• the at least one load connector set and/or

• the coupling elements and/or

• a fuel connection.

As an additional advantage, the installation of the heat pump frame kit according to this embodiment requires few changes to the existing installation site, in particular, extensive interventions in the piping system of the existing, e.g. boiler installation can be reduced to a minimum or even avoided.

According to an embodiment the jig is fluidically connected to the heat pump frame kit and is attached to the wall at a pre-defined distance to the heat pump frame kit. It is conceivable that the jug is alternatively or additionally attached to the heat pump frame kit, in particular to the frame or to back panels of the heat pump frame kit.

The jig may be a steel plate having receiving holes for receiving connectors of a connector set. The holes may be provided at standardized mutual distances to be aligned with connector sets of load circuits.

According to an embodiment the heat pump frame kit comprises a control unit. The control unit is used for controlling the heat pump unit and/or the boiler unit. Additionally, the control unit can be used to control the components discussed above that are arranged in the heat pump frame kit.

According to an embodiment the heat pump frame kit comprises an expansion vessel. . The expansion vessel comprises air and water from a load circuit for the central heating. The expansion vessel maintains a predetermined level of pressure in the load circuit. Expansion vessels are also referred to as expansion tanks. Expansion vessels have various designs. One common design is a rectangular shaped container. Also known are cylinder or disk shaped expansion vessels. The expansion vessel is split in two parts by diaphragm. One part is filled with water from the load circuit, the other part is filled with nitrogen. An expansion vessel further comprises an air valve which allows for the expansion vessel to be depressurized and repressurized as needed. The air valve is used to check the pressure of the expansion vessel and correct it if necessary. For testing, the expansion vessel on the water side must first be depressurized.

According to an embodiment the heat pump frame kit comprises a receiving portion in which selectively an expansion vessel or a control unit can be arranged. In case the control unit is selected to be arranged in the receiving portion of the heat pump frame kit, the expansion vessel can be arranged in the boiler unit or can be arranged outside an energy system. This has the advantage, that the configuration of the heat pump frame kit can be constructively easily optimized to the respective installation needs, requirements and limitations.

The heat pump coupling kit according to the invention allows for particularly easy optimization of the configuration of the heat pump coupling kit to fit the needs, requirements and limitations of the respective installation space. In case the control unit selected to be arranged in the receiving portion of the heat pump frame kit, the expansion vessel can be arranged in the boiler unit or can be arranged outside an energy system. This has the advantage, that the configuration of the heat pump frame kit can be constructively easily optimized to the respective installation needs, requirements and limitations.

The control unit may be integrated in the heat pump frame kit. The control unit may be configured to control the switch valve. The control unit may be configured to control the heat pump unit and/or the boiler unit to which the heat pump frame kit may be connected. The control unit comprise one or more processors or be a processor. Alternatively, the control unit can be a control board circuit or can be part of a control board circuit. Any or all sensors, pumps, actuators, room units of the energy system can be connected the controller unit, wirelessly or via electric lines.

According to an embodiment the heat pump frame kit comprises a mounting fixture for a boiler unit or the heat pump unit. The mounting fixture allows for easy installation, in particular only requiring one installer. The mounting fixture can be comprised in or part of the support panels. The mounting fixture can comprise two protruding sheet metal strips on the top right and on the top left, respectively (in installation position). The mounting fixture can be designed such, that the out-out in a rear panel of a boiler unit, in particular a boiler frame kit, can be accommodated and the weight of the boiler unit, in particular the boiler frame kit, is introduced into the frame of the heat pump frame kit. In other words, the frame of the heat pump frame kit replaces a mounting rail of the boiler unit, in particular a boiler frame kit, which is otherwise attached to the wall with screws. The mounting fixture can be a mounting bracket.

According to an embodiment the at least one load connector set for connecting a cavity of the distributor with at least one load circuit of an energy system comprises an outlet connector configured to convey water from the distributor to the at least one load circuit and a return connector configured to convey water from the at least one load circuit, via the heat exchanger, to the distributor.

Downstream from the return connector and upstream of the heat exchanger a pump may be provided to convey the water through the system.

According to a further embodiment the heat pump frame kit comprises a filter, in particular a magnetic filter, positioned downstream of a return connector of the load connector set, the return connector being configured to convey water from the at least one load circuit to the distributor, in particular via the heat exchanger.

The (magnetic) filter is configured to filter pollution from the water returning from the load circuit(s), to prevent pollution from reaching the pump and the heat exchanger. The (magnetic) filter is preferably positioned downstream from the return connector and upstream of the pump and heat exchanger.

According to a further aspect there is provided a boiler frame kit for a hybrid energy transformation device, comprising o a frame for connecting the boiler frame kit to a heat pump frame kit and/or o at least one control unit wherein the control unit is configured for controlling a boiler unit and/or a heat pump unit.

The boiler frame kit is configured to be attached to the heat pump frame kit. The boiler frame kit may be a newly installed boiler unit which is now combined with a heat pump unit using the heat pump frame kit.

According to an embodiment the boiler frame kit comprises a mounting fixture for a control unit.

According to an embodiment the boiler frame kit comprises a mounting fixture for a boiler control unit.

The boiler control unit may be integrated in the boiler frame kit. The boiler control unit may be configured to control the boiler unit, the heat pump unit and/or the heat pump frame kit.

According to an embodiment the boiler frame kit comprises a control panel, which is configured to or configurable to communicate with the boiler control unit.

The boiler control unit may be configured to control and communicate with boiler parts, including sensors, pumps, actuators, room units via wired or wireless connections (including internet). The boiler control unit may comprise recesses for receiving plugs.

According to an aspect there is provided a hybrid energy transformation device comprising a heat pump frame kit as described, further comprising further comprising a boiler unit, in particular a boiler frame kit as described wherein the heat pump frame kit supports the boiler unit, in particular the boiler frame kit.

According to an aspect there is provided an energy system, comprising a hybrid energy transformation device as described and a heat pump unit.

According to an embodiment, there is provided an energy system, further comprising at least one load circuit. The load circuit can be a central heating circuit or a domestic hot water circuit. The central heating circuit can comprise a radiator for heating a room and/or can be a floor heating. The domestic hot water circuit provides hot water for e.g. showering. An energy system comprising more load circuits can comprise one or more central heating circuits and/or one or more domestic hot water circuits.

The energy system may comprise one load circuit, or two or more load circuits. The load circuits may be selected from a central heating or cooling circuit and a domestic water circuit.

When the energy system is used for cooling purposes, the pipes and components are preferably insulated, in particular diffusion-proof insulated, to prevent condensation formation. Diffusion-proof, also referred to as diffusion-tight insulation is diffusion-proof cold and heat insulation.

The invention further relates to the use of the heat pump frame kit and/or boiler frame kit in a hybrid energy transformation device as described or in an energy system as described.

According to an aspect there is provided a method of maintaining a hybrid energy transformation device as described the method comprising

1) bringing at least one side panel of the heat pump frame kit in a maintenance state by opening or removing the at least one side panel

2) performing maintenance on the hybrid energy transformation device and

3) bringing the at least one side panel f the heat pump frame kit in an operational state by closing or repositioning the at least one side panel.

According to an aspect there is provided a method of installation a hybrid energy transformation device as described, the method comprising a) installing a heat pump frame kit as described by connecting it to a wall and b) installing a boiler unit, in particular a boiler frame kit according to the invention to the heat pump frame kit.

According to an embodiment the method further comprises removing an existing boiler unit before commencing with a). The method may further comprise connecting the at least one load connector set for connecting a cavity of the distributor with at least one load circuit of an energy system. The method may further comprise connecting the first boiler connector set to a first load circuit via the set of coupling elements. The method may further comprise selectively arranging an expansion vessel or a control unit in a receiving slot of the heat pump frame kit. According to an embodiment, an energy system as described comprises a hybrid energy transformation device, which can be installed in a first and second implementation. The boiler unit is installed to a wall and a heat pump frame kit can be installed behind the existing boiler unit as part of an energy system (first implementation) or the boiler unit can be replaced by a heat pump frame kit and a replacement boiler unit, in particular a boiler frame kit (second implementation) and the frame kits are connected to provide a hybrid energy transformation device as part of the energy system.

Dismantling of existing boiler unit

As preceding steps prior to the removal of the boiler unit from the wall, the following can be performed. In a step, a system on the water and gas side is shut off using an existing connector set of a load circuit, in particular shut-off valves, in particular a set of shut off valves for gas and a central heating load circuit. The boiler unit is drained. The connector set, in particular the set of shut-off valves can remain in place but can also be replaced if necessary. In case of a second heating circuit, a respective pump or pump group of said second heating circuit is shut off, pipes of the second heating circuit to the boiler unit are drained and respective the connections are uninstalled. If needed, in a further step, a drinking water storage tank which can be located under the boiler unit, can be uninstalled. In a further step, electrical connections of the boiler unit are disconnected, a condensate drain and a flue gas connection of a flue gas system to the boiler unit can be uninstalled. If needed, a new flue gas system can be installed.

Installation of a hybrid energy transformation device according to the first implementation

In the first implementation, in a first step, the heat pump frame kit is installed by connecting it to the wall and the previously removed boiler unit is installed in a further step by connecting the boiler unit to the heat pump frame kit. The boiler unit can advantageously be installed using the two protruding sheet metal strips of the mounting fixture positioned on the top right and on the top left (in installation position) of the frame of the heat pump frame kit, respectively. The mounting fixture can be designed such, that the out-out in a rear panel of the boiler unit can be accommodated and the weight of the boiler unit is introduced into the frame of the heat pump frame kit. The mounting fixture can be a mounting bracket as described. In other words, the frame of the heat pump frame kit replaces a mounting rail of the boiler unit, in particular a boiler frame kit, which is otherwise attached to the wall with screws. Further details of the installation process are described for the second implementation and also apply to the first implementation.

Installation of a hybrid energy transformation device according to the second implementation

In a first step of the second implementation, a heat pump frame kit is installed by connecting it to the wall and a boiler unit, in particular a boiler frame kit, is installed in a further step by connecting the boiler unit, in particular the boiler frame kit, to the heat pump frame kit. The heat pump frame kit comprises at least one load connector of a connector set which is hold by the jig and which fluidically connects a cavity of the distributor with at least one load circuit of an energy system. The at least one connector is configured to be connected to a corresponding connector, in particular a shut-off valve, of a corresponding connector set of the load circuit in case the distributor is fluidically connected to the load circuit.

The frame of the heat pump frame kit can be aligned with the aid of an integrated spirit level. In the upper left and right corner of the frame of the heat pump frame kit two drill holes each can be provided, through which the frame of the heat pump frame kit can be screwed to the wall, for example by means of key screws.

Optional Right /Left Selection

Depending on the conditions on site (niches, walls, fixtures, closets, etc.), a pump, a heat exchanger, and optionally a switch valve of the heat pump frame kit may not be accessible in the frame of the heat pump frame kit without having to remove the boiler unit, in particular in the form of the boiler frame kit. In the event of maintenance, repair, replacement or to carry out a hydraulic balancing, side panels as described of the heat pump frame kit according to the invention can be easily removed. For example, in case of a niche installation with a accessibility of an installed hybrid energy transformation device from the right side, a removable right-hand side panel could be removed to access the pump, the heat exchanger and the switch valve. It is conceivable that an installer in a planning step prior to the installation, can choose for a product as a right-hand version or a left-hand version. In other words, in case one side panel can be removed for servicing of components of the heat pump frame kit, the heat pump frame kit according to the invention can be provided selectively accessible from the left-hand side or the right-hand side in the installation position. Boiler unit, in

a boiler frame kit installation

As a subsequent step, a boiler unit, in particular a boiler frame kit as described can be installed on the heat pump frame kit. This can be constructively easily achieved by hooking the boiler unit, in particular the boiler frame kit into the mounting fixture of the heat pump frame kit. The mounting fixture can for example provided as a mounting bracket, configured to be arranged on the frame of the heat pump frame kit. The connecting set for boiler flow, boiler return flow and gas can be connected to the heat pump frame kit. The offset from the old to the new connection on the boiler preferably is 150 mm which is the depth of the frame of the heat pump frame kit. The flue gas connection can be re-established to a new flue gas system or to the existing system.

Installation of a control unit

The boiler unit , in particular the boiler frame kit, can be opened and a control unit can be installed, which control unit can be pre-mounted in the boiler frame kit or in the boiler unit. The control unit can also be arranged, in particular pre-mounted, in the heat pump frame kit, allowing for constructively easy adaption of the installation depending on the specific conditions on site. Existing electrical lines of the energy system can be rewired to the control unit, such as a domestic hot water sensor, a room unit, an outdoor sensor, a pump and mixer of a second heating circuit. The control unit according to the invention can comprise pre-installed lines.

Plug in connectors of the pump and the switch valve of the heat pump frame kit can be connected to the control unit. Subsequently, a boiler front cover can be installed.

All system components connected to the control unit, such as the heat pump unit, the boiler unit and any consumers of the energy system, can be controlled via a boiler unit control panel.

The commissioning of the installed boiler unit, including leak test, flue gas measurement, etc., can be carried out as usual.

The invention further relates to a method of operation of an energy system according to the invention, wherein an operation mode of a heat pump unit and of a boiler unit is selected dependent on an outside air temperature and/or an outlet temperature of a load circuit liquid, and/or a threshold value of at least 2,5 COP for the heat pump unit. The COP value is defined as the relationship between the power (kW) that is drawn out of the heat pump as cooling or heat, and the power (kW) that is supplied to the compressor. The COP value can be determined according to DIN EN 14511 .

A further problem to be solved by the application is to provide a method to optimize the use of renewable energies during operation of an energy system.

According to an embodiment, the method further comprises that the heat pump unit and/or the boiler unit is selected such that in a first operation mode the boiler unit is operated and the heat pump unit is deactivated when the outside air temperature is 0 °C, in particular -4 °C, in particular -5 °C, in particular -7°C, in particular -10 °C or less. Additionally or alternatively, such that in a first operation mode the heat pump unit is operated and the boiler unit is deactivated or only provides peak load coverage when the outside air temperature is greater than - 10 °C, in particular -7 °C ,in particular -5 °C, in particular -4 °C, in particular 0 °C and the outlet temperature of the load circuit liquid is less than 55 °C, in particular less than 52 °C, in particular less than 50 °C, in particular less than 45 °C, in particular less than 35 °C. Additionally or alternatively, such that in a first operation mode the boiler unit is operated and the heat pump unit is deactivated when the outlet temperature of the load circuit liquid is 35 °C, in particular, 45 °C , in particular 50°C , in particular 53 °C, in particular 55 °C or greater.

According to an embodiment, the heat pump unit and/or the boiler unit is selected such that a heat load of the heat pump unit is at least 30% at 2 °C outside air temperature and 35 °C outlet temperature of the load circuit liquid.

This has the additional advantage that the method is particularly optimized to the use of renewable energies.

In a further embodiment, the first mode comprises that the selection comprises a delay time for switching on the boiler unit depending on at least one outside temperature condition / threshold.

This has the additional advantage that the heat pump use is further optimized by delaying the use of the boiler even further. In a further embodiment, the first mode comprises a step of selecting a heating zone or room in a building, The first mode can further comprise a pre-heating setting wherein a target temperature is reached over a time period. The time period is selected, received or inputted. This pre-heating step has the additional advantage, that the heat pump unit and/or the boiler unit can operate in a low power mode, whereby the efficiency is further enhanced.

Instead of the first operation mode or additionally, in a further embodiment, the method comprises an alternative or second operation mode, wherein the heat pump unit and/or the boiler unit is alternatively or additionally selected based on the actual or forecasted energy cost price. The method further comprising a step of selecting, receiving or inputting at least one cost parameter.

This has the additional advantage that in addition or as a starting point for the user, the optimization can be based on cost price of the energy used.

Instead of the first operation mode or additionally, in a further embodiment, the method comprises an alternative or third operation mode, wherein the heat pump unit and/or the boiler unit is alternatively or additionally selected based on actual, simulated or forecasted CO2 emission threshold.

The method can further comprise the step of selecting, receiving or inputting at least one CO2 parameter.

This has the additional advantage that flexible to renewable, sustainable energies are chosen based on their CO2 footprint parameters.

In a further embodiment, the method comprises a step of using surplus energy of a PV module of the energy system, wherein the energy of the PV module can be transferred to a buffer tank or used in the operational mode of the heating unit or the boiler unit. This has the additional benefit that the efficiency is further enhanced.

This has the additional advantage that local renewable energy can be stored optimally and enhance sustainability.

The invention further relates to a computer program product comprising programmed instructions for controlling an energy management system as described, wherein the programmed instructions, when executed on a processor of a control unit configured for controlling a boiler unit as described and/or a heat pump unit as described, cause the control unit to carry out the method as described for selecting the heat pump unit and/or the boiler unit.

In the figures, the subject-matter of the invention is schematically shown, wherein identical or similarly acting elements are usually provided with the same reference signs.

Figures 1 schematically show a heat pump frame kit according to an embodiment,

Figures 2a, b schematically show a hybrid energy transformation device according to an embodiment,

Figures 3 schematically shows a back view of a heat pump frame kit according to an embodiment,

Figure 4 schematically shows an energy system according to an embodiment and first and second installation implementation, and

Figure 5 schematically depicts a mounting bracket, and

Figure 6 schematically shows a complete hybrid heat pump product according to the prior art.

Fig. 1 schematically depicts a heat pump frame kit 1 for a hybrid energy transformation device.

The heat pump frame kit 1 comprises a frame 2, which is configured to be attached to a wall. The frame 2 may comprise one or more back panels 3 which, when installed, are positioned against the wall. The back panels 3 may comprise one or more holes for to facilitate attaching the heat pump frame kit 1 to the wall with screws, hooks, nails or the like.

The frame 2 may further be configured to connect to a boiler unit 500, in particular a boiler frame kit 100. When installed, the heat pump frame kit 1 is positioned in between the wall and the boiler unit 500, in particular the boiler frame kit 100. Fig.’s 2a and 2b show the heat pump frame unit 1 connected to the boiler unit 500 shown as the boiler frame kit 100.

The frame 2 may further comprise two side panels 6, shown in Fig. 2b. Fig. 2a shows the same, without side panels 6. The side panels 6 can comprise at least one of steel, aluminium, a polymeric, in particular a thermoplastic material, and a composite material or can be made of steel, aluminium, a polymeric, in particular a thermoplastic material, and a composite material. Steel provides for strong and durable side panels. The aluminium, the polymeric, in particular the thermoplastic material, and the composite material may be used to reduce the noise generated by the heat pump frame kit and the boiler unit and reduce the weight of the respective unit.

The side panels 6 may be attached to the frame 2 in a removable or openable manner. The side panels 6 may be configured to be attached to the frame 2 in an operational state to close off the interior of the heat pump frame kit 1 and are configured to be opened or removed from the frame in a maintenance state to allow access to the interior of the heat pump frame kit 1. The side panels 6 may be connected to the frame 2 via a hinge, allowing the side panels 6 to be opened.

The heat pump frame kit 1 is configured to be connected to a heat pump unit 200. The heat pump frame kit 1 comprises at least one heat pump connector set 14 for connection to a heat pump unit 200. The heat pump unit 200 may be any kind of suitable heat pump unit 200. Heat pump units 200 comprise a refrigerant circulation system in which a refrigerant is circulated to transfer heat. Such a refrigerant circulation system comprises a compressor, an expansion valve, a source medium-refrigerant heat exchanger and a refrigerant-destination medium heat exchanger. According to the embodiment, the refrigerant-destination medium heat exchanger 9 is arranged in the frame 2 of the heat pump frame kit 1 , while the other components are in the heat pump unit 200. The heat pump unit 200 may be a split heat pump comprising all further components of the refrigerant circulation system or may comprise an indoor and an outdoor unit together comprising all further components of the refrigerant circulation system, the outdoor unit comprising the source medium refrigerant heat exchanger. The source medium may be air or water. The destination medium may be water.

As shown in Fig. 1 , the heat pump frame kit 1 comprises a heat exchanger 9 for heat exchange between a refrigerant of a heat pump unit 200 and a load circuit 300.

Further provided is a distributor 10, which is fluidically connected to the heat exchanger 9 to receive water from the heat exchanger 9 which is heated or cooled by the refrigerant in the heat exchanger 9. The distributor 10 comprises a cavity in which water can be collected from the heat exchanger 9, the boiler unit 500 and from which water can be discharged to the boiler unit 500 and to the one or more load circuits. The distributor 10 is arranged within a volume delimited by the frame 2, in the figure the distributor 10 is connected to the frame 2.

The distributor 10 is a hydronic or hydraulic distributor by means of which a liquid, in particular water, as an energy carrier is distributed between the heat pump unit and/or boiler on one side and at least one load circuit on the other side. The terms hydraulic and hydronic are used synonymously.

The heat pump frame kit 1 comprises a set of coupling elements 15 to fluidically connect a first boiler connector set 18 to a first load circuit. The coupling elements 15 may be short tubes or intermediate piping elements. These coupling elements 15 facilitate fluidically connecting a first boiler connector set to for instance a domestic warm water load circuit.

The distributor 10 comprises at least one load connector set 17 for connecting a cavity of the distributor 10 with at least one further load circuit of an energy system 400, e.g. central heating circuit). Preferably, at least one load connector set 17 is positioned such that it is connected with a corresponding connector set of a load circuit. The load connector set 17 may be arranged at a standard distance from the wall (or the parts of the heat pump frame kit to be positioned against the wall, i.e. the back panel(s)) and at a standard mutual distance relative to each other, i.e. the first connector and the second connector are at a standard mutual distance relative to each other. The distances are all measured from the centre point of the connectors. The distance from the wall may be in the range of 70 - 80 mm, for instance 60 mm. The mutual distance may be in the range of 60 - 70 mm, for instance 75 mm.

As shown in Fig. 1 , the heat pump frame kit 1 comprises a jig 4 holding the at least one load connector set 17, the coupling elements 15 and a fuel connection 19. The jig is connected to the frame 2 and provides for a standardized, easy to reach place to make different connections.

The fuel connection 19 facilitates connecting a fuel supply, such as for instance a domestic gas line, to the boiler unit 500.

Fig. 1 further shows expansion vessel 26. The expansion vessel 26 comprises air and water from a load circuit 300 for the central heating. The expansion vessel 26 maintains a predetermined level of pressure in the load circuit 300. Expansion vessels 26 are also referred to as expansion tanks. Expansion vessels 26 have various designs. One common design is a rectangular shaped container. Also known are cylinder or disk shaped expansion vessels. The expansion vessel 26 is split in two parts by diaphragm. One part is filled with water from the load circuit 300, the other part is filled with nitrogen. An expansion vessel 26 further comprises an air valve which allows for the expansion vessel 26 to be depressurized and repressurized as needed. The air valve is used to check the pressure of the expansion vessel 26 and correct it if necessary. For testing, the expansion vessel 26 on the water side must first be depressurized.

The heat pump frame kit 1 may comprise a control unit 25. An example of this is shown in Fig. 3, schematically showing a back view of a heat pump frame kit 1 , comprising a control unit 25. For reasons of clarity, the frame 2 is not shown. In case the control unit 25 is selected to be arranged in the receiving portion of the heat pump frame kit 1 , the expansion vessel 26 can be arranged in the boiler unit 500 or can be arranged outside an energy system 400. This has the advantage, that the configuration of the heat pump frame kit 1 can be constructively easily optimized to the respective installation needs, requirements and limitations.

The control unit 25 may be integrated in the heat pump frame kit. The control unit may be configured to control, the heat pump unit and/or the boiler unit to which the heat pump frame kit may be connected. The control unit comprise one or more processors or be a processor. Alternatively, the control unit can be a control board circuit or can be part of a control board circuit. Any or all sensors, pumps, actuators, room units of the energy system can be connected the controller unit, wirelessly or via electric lines (not shown).

The heat pump frame kit may comprise a receiving portion in which selectively an expansion vessel 26 or a control unit 25 can be arranged.

Fig. 4 shows a more schematic overview of the system, showing an energy system 400. The energy system 400 comprises a heat pump unit 200 connected to a so-called hybrid energy transformation device, which is formed by the heat pump frame kit 1 and a boiler unit 500, in particular a boiler frame kit 100. The boiler frame kit 100 is configured to be connected to the heat pump frame kit 1 by means of frame 2, which is not shown in Fig. 4. Fig. 4 schematically shows a first boiler connection set 18, which f luidically connects the boiler unit 500 to a first load circuit 300, by-passing the coupling elements 15 and non shown connectors of the load circuit 300. The first load circuit 300 may be a domestic warm water circuit, used for tap water and showering.

The distributor 10 is depicted, being fluidly connected to the boiler unit 500 via a second boiler connector set 18’ and corresponding boiler pipes 28. That means, the boiler unit 100 is fluidically connected with the distributor 10 by means of the second boiler connector set 18’. The heat exchanger 3 is shown, which is fluidly connected to a heat pump unit 200 via heat pump connector set 14 and corresponding refrigerant pipes. The distributor 10 is connected to a second load circuit 300 via load connector set 17. The second load circuit 300 may be a central heating circuit.

Load connector set 17 for connecting a cavity of the distributor 10 with at least one load circuit of an energy system 400 comprises an outlet connector 17 configured to convey water from the distributor 10 to the at least one load circuit 300 and a return connector 17’ configured to convey water from the at least one load circuit to the distributor 10. This return flow is not directly connected to the distributor 10, but to the heat exchanger 9 from which the water flows to the distributor 10. The connection between the return connector 17’ and the heat exchanger is provided by a return pipe 29.

The return pipe comprises a pump 30 to pump water from the load circuit 300 to the heat exchanger 9.

The return pipe comprises a filter 31 . In the embodiment depicted there is provided a magnetic filter, filtering pollution from the returning water, thereby protecting the heat exchanger 9 and the pump 30. The filter 31 is positioned upstream from the pump 30 and the heat exchanger 9.

Further provided is a further return pipe 32, which fluidically connects the heat exchanger 9 and the collector 10 to convey water from the heat exchanger 9 to the collector 10. The further return pipe 32 may comprise a flow meter.

When the outside temperatures are such that the heat pump unit 200 does not work (efficiently), the boiler unit 500 takes water from the distributor 10, returns heated water to the distributor 10 via the second boiler connector set 18. From the distributor 10 warm water is send to the load circuit 300 and returned from the load circuit 300 via load connector set 17. This water flows through the heat exchanger 9, without exchanging heat with the refrigerant.

When the outside temperatures are such that the heat pump unit 200 and the boiler unit 500 work together, water that is returned from the load circuit 300 is heated by the refrigerant from the heat pump unit 200 in the heat exchanger 9 before it is returned to the distributor. To heat the water further, the boiler unit 500 still takes water from the distributor 10 and returns heated water to the distributor 10 via second boiler connector set 18’.

When the outside temperatures are such that the heat pump unit 200 can work without support from the boiler unit 500, water that is returned from the load circuit 300 is heated by the refrigerant from the heat pump unit 200 in the heat exchanger 9 before it is returned to the distributor. The boiler unit 500 is idle and no water it taken from the distributor 10 and returned to the distributor 10 via second boiler connector set 18’.

The energy system 400 as shown schematically in Fig. 4 comprises a hybrid energy transformation device 600, which can be installed in a first and second implementation. The boiler unit 500 is installed to a wall and a heat pump frame kit 1 can be installed behind the existing boiler unit 500 as part of an energy system 400 (first implementation) or the boiler unit 500 can be replaced by a heat pump frame kit 1 and a replacement boiler unit 500, in particular a boiler frame kit 100 (second implementation) and the frame kits are connected to provide a hybrid energy transformation device 600 as part of an energy system 400.

Dismantling of existing boiler unit 500

As preceding steps prior to the removal of the boiler unit 500 from the wall, the following is performed. In a step, a system on the water and gas side (not shown) is shut off using an existing connector set 17 of a load circuit 30, in particular shut-off valves, in particular a set of shut off valves 36 for gas and a central heating load circuit. The boiler unit 500 is drained. The connector set 17, in particular the set of shut-off valves 43 can remain in place but can also be replaced if necessary. In case of a second heating circuit, a respective pump or pump group of said second heating circuit is shut off, pipes of the second heating circuit to the boiler unit 500 are drained (not shown) and respective the connections are uninstalled. If needed, in a further step, a drinking water storage tank (not shown) which can be located under the boiler unit 500, can be uninstalled. In a further step, electrical connections of the boiler unit 500 are disconnected, a condensate drain (not shown) and a flue gas connection of a flue gas system (not shown) to the boiler unit 500 can be uninstalled. If needed, a new flue gas system (not shown) can be installed.

Installation of a hybrid energy transformation device 600 according to the first implementation

In the first implementation, in a first step, the heat pump frame kit 1 is installed by connecting it to the wall and the previously removed boiler unit 500 is installed in a further step by connecting the boiler unit 500 to the heat pump frame kit 1 . The boiler unit 500 can advantageously be installed using the two protruding sheet metal strips 42 of the mounting fixture 39 positioned on the top right and on the top left (in installation position) of the frame 2, respectively. The mounting fixture 39 is designed such, that the out-out in a rear panel of the boiler unit 500 can be accommodated and the weight of the boiler unit 500 is introduced into the frame 2. The mounting fixture can be a mounting bracket 40 as shown in Fig. 5. In other words, the frame 2 replaces a mounting rail (not shown) of the boiler unit 500, in particular a boiler frame kit 100, which is otherwise attached to the wall with screws (not shown). Further details of the installation process are described for the second implementation and also apply to the first implementation.

Installation of a hybrid energy transformation device 600 according to the second implementation

In a first step of the second implementation, a heat pump frame kit 1 is installed by connecting it to the wall and a boiler unit 500, in particular a boiler frame kit 100, is installed in a further step by connecting the boiler unit 500, in particular the boiler frame kit 100, to the heat pump frame kit 1 . At least one load connector 17 of a connector set , which is hold by the jig 4 and which f lu id ically connects a cavity of the distributor 10 with at least one load circuit 30 of an energy system 400. The at least one connector 17 is configured to be connected to a corresponding connector, in particular a shut-off valve 43, of a corresponding connector set 17 of the load circuit in case the distributor 10 is fluidically connected to the load circuit 30. The frame 2 can be aligned with the aid of an integrated spirit level (not shown). In the upper left and right corner of the frame 2 two drill holes each can be provided, through which the frame 2 can be screwed to the wall, for example by means of key screws.

/ Left Execution

Depending on the conditions on site (niches, walls, fixtures, closets, etc.), a pump, a heat exchanger 41 and optionally a switch valve may not be accessible in the frame 2 without having to remove the boiler unit 500, in particular in the form of the boiler frame kit 100. In the event of maintenance, repair, replacement or to carry out a hydraulic balancing, the side panels 6 can be easily removed. For example, in case of a niche installation, in case of a niche installation with an accessibility of an installed hybrid energy transformation device 600 from the right side, a removable right-hand side panel 6 could be removed to access the pump, the heat exchanger and the switch valve. It is conceivable that an installer in a planning step prior to the installation, can choose for a product as a right-hand version or a left-hand version. In other words, in case one side panel 6 can be removed for servicing of components of the heat pump frame kit 1 , the heat pump frame kit 1 can be provided selectively accessible from the left-hand side or the right-hand side in the installation position.

Boiler unit 500, in particular a boiler frame kit 100 installation

As a subsequent step, a boiler unit 500, in particular a boiler frame kit 100 can be installed on the heat pump frame kit 1. This can be constructively easily achieved by hooking the boiler unit 500, in particular the boiler frame kit 100 into the mounting fixture 39, for example provided as a mounting bracket 40 as shown in fig. 9, provided on the frame 2. The connecting set 15 for boiler flow, boiler return flow and gas to the heat pump frame kit 1 . The offset from the old to the new connection on the boiler preferably is 150 mm which is the depth of the frame 2. The flue gas connection can be re-established to a new flue gas system or connection to the existing system (not shown).

Installation of a control unit 25

The boiler unit 500, in particular the boiler frame kit 100, can be opened and a control unit 25 can be installed, which can be pre-mounted in the boiler frame kit 100, in the boiler unit 500. The control unit 25 can also be arranged, in particular pre-mounted, in the heat pump frame kit 1 , allowing for constructively easy adaption of the installation depending on the specific conditions on site. The existing electrical lines of the energy system 400 can be rewired to the control unit 25, such as a domestic hot water sensor, a room unit, an outdoor sensor, a pump and mixer of a 2^nd heating circuit. The controller 25 according to the invention can comprise pre-installed lines. Plug in connectors of the pump 22 and the switch valve 23 can be connected to the control unit 25. Subsequently, a boiler front cover can be installed.

All system components connected to the control unit 25, such as the heat pump unit 200, the boiler unit 500 and any consumers (not shown), can be controlled via a boiler unit control panel 44.

The commissioning of the boiler unit 500, including leak test, flue gas measurement, etc., can be carried out as usual.

Fig. 5 schematically depicts a mounting bracket 40.

Fig. 6 shows a complete hybrid heat pump product 700 according to the prior art, comprising a heat pump unit 800 with an heat exchanger, an out-door unit (not shown), and a boiler unit 900 in one compact system, wherein a load line 36 of the heat pump unit 800 and a load line 37 of the boiler unit 900 are directly fluidically connected via a T-piece 34 to the load connector to the load circuit for a central heating 35. The complete hybrid heat pump product 700 allows for components of the units (800, 900) to be accessed from the front F of the complete hybrid heat pump product 700.

Reference Signs

1 . Heat pump frame kit

2. Frame

3. Back panel

4. Jig

6. Side panel

9. Heat exchanger

10. Distributor

14. Heat pump connector set

15. Coupling elements

17. Load connector set (heating/cooling)

18. (First/second) boiler connection set

19. Fuel connection

25. Control unit

26. Expansion vessel

27. Refrigerant pipes

28. Boiler pipes

29. Return pipe

30. Pump

31. Filter

32. load connector

33. corresponding connector of a corresponding connector set of the load circuit

34. T-piece

35. load circuit for a central heating

36. load line (heat pump unit 800)

37. load line (boiler unit 900)

38. receiving portion

39. mounting fixture for a boiler

40. Mounting bracket

41. Heat exchanger

42. sheet metal strips

43. shut-off valve

44. boiler unit control panel

100. Boiler frame kit 200. Heat pump unit

300. Load circuit

400. Energy system

500. Boiler unit 600. Hybrid energy transformation device

700. Complete hybrid heat pump product

800. Heat pump unit

900. Boiler unit F. Front

Claims

PATENT CLAIMS

1 . Heat pump frame kit (1 ) for a hybrid energy transformation device (600), the heat pump frame kit (1 ) comprising a frame (2) for connecting the heat pump frame kit (1 ) to a wall and to a boiler unit (500), boiler unit (500), in particular a boiler frame kit (100), and a heat exchanger (9) for heat exchange between a refrigerant of a heat pump unit (200) and a load circuit (300) and wherein the heat pump frame kit (1 ) comprises side panels (6) which are configured to be attached to the frame (2) in an operational state of the heat pump support frame kit (1 ) and are configured to be opened or removed from the heat pump support frame kit (1 ) in a maintenance state.

2. Heat pump frame kit (1 ) according to claim 1 , wherein the heat pump frame kit (1 ) comprises two side panels (6).

3. Heat pump frame kit (1 ) according to any one of the preceding claims, wherein the side panels (6) comprise at least one of steel, aluminium, a polymeric, in particular a thermoplastic material, and a composite material or can be made of steel, aluminium, a polymeric, in particular a thermoplastic material, and a composite material.

4. Heat pump frame kit (1 ) according to any one of the preceding claims, wherein the heat pump frame kit (1 ) comprises a distributor (10) arranged within a volume delimited by the frame (2), in particular connected to the frame (2), and fluidically connected to the heat exchanger (9), wherein the distributor (10) comprises at least one load connector set (17) for connecting a cavity of the distributor (10) with at least one load circuit of an energy system (400).

5. Heat pump frame kit (1 ) according to any one of the preceding claims, wherein the heat pump frame kit (1 ) comprises a set of coupling elements (15) to fluidically connect a first boiler connector set (18) to a first load circuit (300).

6. Heat pump frame kit (1 ) according to any one of the preceding claims, wherein the heat pump frame kit (1 ) comprises a jig (4), the jig (4) holds

• the at least one load connector set (17) and/or

• the coupling elements (15) and/or

• a fuel connection (19).

7. Heat pump frame kit (1 ) according to claim 6, wherein the jig (4) is fluidically connected to the heat pump frame kit (1 ), in particular to the frame (2) or to back panels (3) of the heat pump frame kit (1 ).

8. Heat pump frame kit (1 ) according to any one of the preceding claims, wherein the heat pump frame kit (1 ) comprises a control unit (25).

9. Heat pump frame kit (1 ) according to any one of the preceding claims, wherein the heat pump frame kit (1 ) comprises an expansion vessel (26).

10. Heat pump frame kit (1 ) according to any one of the preceding claims, wherein the heat pump frame kit (1 ) comprises a receiving portion (38) in which selectively an expansion vessel (26) or a control unit (25) can be arranged.

11 . Heat pump frame kit (1 ) according to any one of the preceding claims, wherein the at least one load connector set (17) for connecting a cavity of the distributor (10) with at least one load circuit (300) of an energy system (400) comprises an outlet connector configured to convey water from the distributor (10) to the at least one load circuit (300) and a return connector configured to convey water from the at least one load circuit, via the heat exchanger (9), to the distributor (10).

12. Heat pump frame kit (1 ) according to any one of the preceding claims, wherein the heat pump frame kit (1 ) comprises a filter (31 ), in particular a magnetic filter (31 ), positioned downstream of a return connector of the load connector set (17), the return connector being configured to convey water from the at least one load circuit to the distributor (10), in particular via the heat exchanger (9).

13. Boiler frame kit (100) for a hybrid energy transformation device, comprising o a frame for connecting the boiler frame kit (100) to a heat pump frame kit (1 ) and/or o at least one control unit wherein the control unit is configured for controlling a boiler unit (500) and/or a heat pump unit (200).

14. Boiler frame kit (100) according to claim 13, wherein the boiler frame kit (100) comprises a mounting fixture (39) for a boiler control unit (25).

15. Boiler frame kit (100) according to claim 14, wherein the boiler frame kit (100) comprises a control panel (44), which is configured to or configurable to communicate with the boiler control unit.

16. Hybrid energy transformation device (600) comprising a heat pump frame kit (1 ) according to any one of the claims 1 - 12, further comprising a boiler frame kit according to any one of the claims 13 - 15 or a boiler unit (500), wherein the heat pump frame kit (1 ) supports the boiler unit (500), in particular the boiler frame kit (100).

17. Energy system (400), comprising a hybrid energy transformation device (600) according to claim 16 and a heat pump unit (200).

18. Energy system (400) according to 16, further comprising at least one load circuit (300).

19. Use of the heat pump frame kit (1 ) and/or boiler frame kit in a hybrid energy transformation device (600) according to claim 16 or in an energy system (400) according to any one of the claims 17 - 18.

20. Method of maintaining a hybrid energy transformation device (600) according to claim 16, the method comprising

4) bringing at least one side panel (6) of the heat pump frame kit (1 ) in a maintenance state by opening or removing the at least one side panel (6)

5) performing maintenance on the hybrid energy transformation device and

6) bringing the at least one side panel (6) of the heat pump frame kit (1) in an operational state by closing or repositioning the at least one side panel (6).

21. Method of operation of an energy system (400) according to claims 17 or 18, wherein an operation mode of a heat pump unit (200) and of a boiler unit (500) is selected dependent on an outside air temperature and/or an outlet temperature of a load circuit liquid and/or a threshold value of at least 2,5 COP for the heat pump unit (200).

22. Method according to claim 21 , wherein the method further comprises that the heat pump unit (200) and/or the boiler unit (500) is, in particular selectively, selected a) such that in a first operation mode the boiler unit (500) is operated and the heat pump unit (200) is deactivated when the outside air 0 °C, in particular -4 °C, in particular -5 °C, in particular -7°C, in particular -10 °C or less; and/or b) such that in a first operation mode the heat pump unit (200) is operated and the boiler unit (500) is deactivated or only provides peak load coverage when the outside air temperature is greater than -10 °C, in particular -7 °C ,in particular -5 °C, in particular -4 °C, in particular 0 °C and the outlet temperature of the load circuit liquid is less than 55 °C, in particular less than 52 °C, in particular less than 50 °C, in particular less than 45 °C, in particular less than 35 °C; and/or c) such that in a first operation mode the boiler unit (500) is operated and the heat pump unit (200) is deactivated when the outlet temperature of the load circuit liquid is 35 °C, in particular, 45 °C, in particular 50°C, in particular 53 °C , in particular 55 °C or greater.

23. Method according to claim 21 or claim 22, wherein the method further comprises that the heat pump unit (200) and/or the boiler unit (500) is selected such that a heat load of the heat pump unit (200) is at least 30% at 2 °C outside air temperature and 35 °C outlet temperature of the load circuit liquid.

24. A computer program product comprising programmed instructions for controlling an energy management system (400) according to at least one of claims 17 or 18, characterised in that the programmed instructions, when executed on a processor of a control unit (25) configured for controlling a boiler unit (500) and/or a heat pump unit (200), cause the control unit (25) to carry out the method of any one of claims 21 to 23.