DE102020127770A1 - cooler - Google Patents

Abstract

The present invention relates to a cooling device (1) comprising: a substantially vertical riser (2), a heat exchanger (3) arranged below the riser, and a ventilation device (4) adapted thereto to emit a gaseous To suck in medium and to move it to flow through the heat exchanger (3) and to promote it through the riser pipe (2).

Description

The present invention relates to a cooling device for rooms, in particular for industrial halls.

Industrial halls have large volumes and it is difficult to cool these large volumes homogeneously when necessary. This is due to the fact that when turbomachines are used for air conditioning, there are always dead spaces in which cooling and a homogeneous temperature distribution are difficult to achieve.

In the prior art is from the document DE 10 2016 125 735 A1 a device for cooling buildings, in particular halls, is known, which consists essentially of an air cooler arranged on the ceiling side, through which cooling liquid flows, to which a chute is attached on the bottom side, through which the cooled air is guided to the ground. The air coolers have a compact, cylindrical contour and a chute designed as a downpipe is arranged below the air cooler for air routing. Such a device works according to the principle of gravity, so no fan or active ventilation is necessary. This makes the device very efficient, since no electrical energy has to be used to maintain the flow through the air cooler and chute.

However, the cooling elements arranged on the ceiling side are difficult to access from the hall floor - for maintenance and cleaning purposes, for example.

In addition, a significant temperature gradient develops across the height of the room, since a cold air sea forms on the floor of the room to be cooled, and heated air rises above heat sources (i.e. above objects to be cooled) to be cooled again by the air cooler under the ceiling will. The temperature on the floor is therefore significantly lower than under the ceiling, which corresponds to inhomogeneous temperature stratification.

It is therefore an object of the present invention to provide an improved, easy-to-handle cooling device which can be easily connected to a coolant network and whose cooling efficiency is improved over the prior art. In addition, a homogeneous temperature stratification over the height of the room should be achieved.

This object is solved by a cooling device according to claim 1 and a system according to claim 9.

A cooling device according to the invention comprising a riser pipe, a heat exchanger which is arranged below the riser pipe, and a ventilation device which is adapted to draw in a gaseous medium and move it to flow through the heat exchanger and convey it into the riser pipe. The treated, cooled room air can thus be conveyed upwards through the riser pipe. As cold air sinks due to its higher density, the cold air moves back to the floor of a room, which can realize constant and homogeneous cooling. Within a very short time, a homogeneous temperature stratification forms over the height of the room.

The heat exchanger preferably has two connections which are adapted to allow the inflow and outflow of coolant which is intended to flow through the heat exchanger. More preferably, the inflow and/or the outflow is controlled by controllable valves, for example 3-way valves. As a result, thermal differences in the measuring rooms can be taken into account in the control technology

More preferably, the riser has an angled section which is located in the upper area of the riser. This allows the flow of cooled air to be directed to the center of the room. As a result, the riser pipe does not have to extend to the ceiling of a room in order to form a homogeneous temperature stratification between the floor and the upper area of the riser pipe. Rather, the flow of cooled air forms a mixing area when exiting the riser due to the horizontal component of the flow, whereby an area with warm air above the mixing area is thermally sealed off from the area (with a homogeneous temperature stratification) below the mixing area.

If the room to be cooled has a poorly insulated roof, for example, the thermal load to be managed by the air conditioning on hot summer days is even significantly reduced. The space below the roof can heat up as a buffer area down to the mixing area below, whereby this volume of air acts as a buffer for absorbing thermal energy.

Preferably, the heat exchanger is adapted to allow ambient air to flow radially into it. More preferably, the heat exchanger essentially has a hollow-cylindrical shape.

The heat exchanger is preferably a fin heat exchanger and has spaced-apart flow-through tubes and spaced-apart fins. More preferably, it is delimited at the top by a top plate and at the bottom by a bottom plate. In this case, the upper plate has an opening for connection to the riser pipe.

The arrangement of the tubes in a hollow-cylindrical form (with spaces between the individual windings) allows air to flow efficiently into the heat exchanger. The surface of the heat exchanger is increased by fins, which preferably extend axially over the length of the heat exchanger. A heat flow can thus be transferred from the incoming air to the fins, from which the heat flow is transferred by conduction to the tubes, and there it is transferred to the coolant by convective heat transfer. This ensures a very high cooling capacity.

More preferably, the heat exchanger includes tubes and/or fins which contain copper, aluminum or an alloy thereof. These materials have particularly good thermal conductivity.

An opening which can be closed with a cover is preferably provided in the base plate. When closed, the cover ensures that ambient air flows radially into the heat exchanger and not through the opening in the base plate. By providing a base plate with an opening, the heat exchanger can be cleaned particularly easily. To do this, the cover is removed and water is sprayed onto the heat exchanger from the outside. The waste water can drain down through the opening in the base plate. This construction means that the heat exchanger can be designed and operated without a filter, which means that flow losses can be significantly reduced. As a result, the energy expenditure for air transport is extremely low and is less than one tenth compared to classic air conditioning devices with ventilation units and duct distribution systems. Contamination of the heat exchanger caused by operation without a filter is not a problem, since regular cleaning can be carried out with little effort.

More preferably, the ventilation device is arranged directly above the heat exchanger or in the riser pipe. This leads to short supply air pipe paths, which is very advantageous in terms of flow technology.

A system according to the invention consists of several cooling devices which are arranged in a room, for example a hall.

By placing the angled sections of the riser pipes opposite one another, a mixing area or a mixing section is particularly advantageously produced in the upper spatial area, which forms a homogeneous, temperature-stable area underneath in the simplest way. In addition, due to the return air being sucked in close to the floor, a forced flow is generated right down to the floor, thus achieving a large-area flushing without flow-free nests. This forced air flow ensures a very strong mix in the hall and neutralizes the natural stratification below the mixing area.

A buffer layer is formed above the mixing area, which is sealed off from the room volume to be cooled by the mixing area. As a result, thermal energy inputs from above, for example due to a poorly insulated roof or other heat sources, can be absorbed by the buffer layer, which heats up as a result. This means that the entire room volume does not have to be cooled in order to achieve homogeneous temperature stratification from the floor to a desired height.

By hanging the heat exchangers close to the ground, cleaning them, especially the fins, is extremely easy. When connecting to a coolant network, little pipe material is also required, since the heat exchanger is intended for installation close to the floor.

A plurality of cooling devices according to the invention are preferably distributed in the outer peripheral area of the base area of the room to be cooled, for example on the walls, with the angled sections of the riser pipes being directed towards the center of the room.

• 1 zeigt eine Ausführungsform der Kühlvorrichtung 1 der vorliegenden Erfindung in isometrischer Ansicht.
• 2 zeigt eine Ausführungsform der Kühlvorrichtung 1 der vorliegenden Erfindung schräg von unten dargestellt.
• 3 zeigt einen Ausschnitt einer Kühlvorrichtung 1 der vorliegenden Erfindung in Detailansicht.
• 4 zeigt eine schematische Ansicht einer Ausführungsform der Kühlvorrichtung 1 der vorliegenden Erfindung, in welcher von außen nicht sichtbare Komponenten gestrichelt angedeutet sind.
• 5a zeigt eine Anordnung mehrerer Kühlvorrichtungen 1 der vorliegenden Erfindung von der Seite.
• 5b zeigt die Ansicht aus 5a. mit eingezeichneten Luftschichtungen.
• 6 zeigt eine Anordnung mehrere Kühlvorrichtungen 1 der vorliegenden Erfindung in einem Raum in isometrischer Ansicht.

In the following, embodiments of the present invention are explained in more detail with reference to the enclosed figures.

• 1 shows an embodiment of the cooling device 1 of the present invention in isometric view.
• 2 shows an embodiment of the cooling device 1 of the present invention shown obliquely from below.
• 3 shows a section of a cooling device 1 of the present invention in a detailed view.
• 4 shows a schematic view of an embodiment of the cooling device 1 of the present invention, in which components that are not visible from the outside are indicated by dashed lines.
• 5a shows an arrangement of several cooling devices 1 of the present invention from the side.
• 5b shows the view 5a . with marked air layers.
• 6 shows an arrangement of several cooling devices 1 of the present invention in a room in an isometric view.

In 1 shows a cooling device 1 in an isometric view. A heat exchanger 3 is provided in the form of a hollow cylinder, the tubes and channels of the heat exchanger 3 enclosing a cylindrical space. On the upper side of the heat exchanger 3 is bounded by a top plate 5, below by a bottom plate 6. Connecting elements 7 connect the top plate 5 and the bottom plate 6. The bottom plate 6 has an opening 6a (not shown here), which is connected to a Lid 6b can be closed.

The riser pipe 2 is connected to the upper plate 5 via a flange 5a. This riser pipe 2 also has an angled section 2a in the upper part, at the end of which there is the opening 2b.

Ambient air is sucked in through the outer peripheral surface of the heat exchanger 3, flows through the heat exchanger 3, enters the cylindrical space within the heat exchanger 3, and is then conveyed upwards via the riser pipe 2. There the cooled air is discharged and then sinks back down, creating a cooling effect for rooms.

Not shown in 1 the connections 3a, 3b and the valves 3v, via which the heat exchanger 3 can be connected to a coolant-circulating device or a coolant network.

In 2 the cooling device 1 is shown obliquely from below. It is also shown here that an opening 6a is provided in the base plate 6, which opening can be closed by a cover 6b. The bottom plate 6 is connected to the top plate 5 by connecting elements 7 . The heat exchanger 3 is arranged between the bottom plate 6 and the top plate 5 . Above the heat exchanger 3 is the riser pipe 2 with an angled section 2a.

The heat exchanger 3 is a finned heat exchanger with tubes 3R arranged in the shape of a hollow cylinder and fins 3L which are connected to the tubes 3R and preferably extend axially over the entire length of the heat exchanger 3 .

Due to the fact that the tubes 3R are spaced apart from one another and the fins 3L are spaced apart from one another, ambient air can be sucked radially into the heat exchanger 3 , which is then cooled and can be transported further in the riser pipe 2 .

In 3 a detailed view of the heat exchanger 3 is shown in a partially exploded view. An annular recess 6c is provided in the base plate 6, in which the lower part of the heat exchanger 3 can be accommodated. In addition, the upper plate 5 and connecting elements 7 are shown.

In a further preferred embodiment, the ring-shaped depression 6c is only optionally provided for accommodating the lower part of the heat exchanger 3, but mainly for collecting condensed water, which can be discharged to the outside through a drainage channel through the base plate 6.

In 4 a schematic view of the cooling device 1 is shown. The inner structure of the cooling device 1 is also at least partially visible here. Above the heat exchanger 3, a ventilation device 4 is arranged in the riser pipe 2, which is designed here as a fan. As a result, outside air can be sucked in, flows through the heat exchanger 3 , is cooled there and then conveyed upwards via the ventilation device 4 . The cooled air then rises in the riser pipe 2, also passes through the angled section 2a and is then blown out.

5a shows two cooling devices 1 from the side. The two cooling devices 1 are arranged opposite one another and, as shown in the previous figures, have a heat exchanger 3 and a riser pipe 2 with an angled section 2a. The flows of the cooled air are represented by arrows. This is ejected from the bent portion 2a of the riser 2, falls toward the bottom, and is then sucked in again by the heat exchanger 3 of each cooling device 1.

5b shows the view 5a , showing different regions of temperature stratification. A roof D is shown in section at the top, through which thermal load in the form of solar radiation penetrates into the room to be air-conditioned. The buffer area P, which extends from roof D to the next one below dashed line, contains cool air early in the morning, which heats up during the course of the day and thus during the course of the solar radiation. In the mixing area M below, an area is formed in which warm air from the buffer area P is mixed with cold air from the cooling device 1 . The mixing area M acts as a barrier layer, which limits the air volume within the buffer area P at the bottom and thus encloses it under the roof D.

The heat input from the solar radiation through the roof D into the buffer area P only has to be dissipated to a small extent by the cooling device 1 since the warm air of the buffer area P cannot spread throughout the room or is completely mixed.

Energy-efficient cooling of the room is thus achieved, among other things, by the fact that the upper area is allowed to heat up in a targeted manner by the sun, and the cooling devices 1 only cool the area below the mixing area M. As a result, less cooling capacity is required, while a homogeneous temperature profile below the mixing area M is nevertheless achieved.

The specific design (mounting height of the heat exchanger 3, length of the riser pipe 2 with length and angle of inclination of the angled section 2a, number and mounting locations of the cooling devices 1) is hereby adapted to the individual circumstances and initial requirements of the location and the conditions of use, through the knowledge of the specialist.

6 shows an arrangement of six cooling devices 1 in one room. There are three cooling devices 1 with heat exchanger 3 and riser 2 with angled section 2a arranged next to each other as an example, and these are further three cooling devices 1 opposite.

The present invention is not limited to the embodiments described. Instead of a lamellar heat exchanger, a tubular heat exchanger could also be provided, for example.

Furthermore, the ventilation device 4 can be provided at any point in the riser pipe 2 .

Reference List

1

cooler

2

riser

2a

angled section

2 B

opening

3

heat exchanger

3a, 3b

connection

3v

Valve

4

ventilation device

5

top plate

6

bottom plate

6a

opening

6b

lid

6c

annular indentation

7

fastener

D

roof

P

buffer area

M

mixing area

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 102016125735 A1 [0003]

Claims (10)

Cooling device (1) for installation in a room to be air-conditioned, having: a substantially vertical riser (2), a heat exchanger (3), which is arranged below the riser pipe (2), and a ventilation device (4) which is adapted to draw in a gaseous medium and to move it to flow through the heat exchanger (3) and to convey it through the riser pipe (2). Cooling device (1) according to claim 1 , the heat exchanger (3) having two connections (3a, 3b) which are adapted to allow the inflow and outflow of coolant which flows through the heat exchanger (3), at least one of the connections (3a, 3b) or both connections (3a, 3b) are preferably provided with controllable valves (3v) via which the inflow and outflow can be regulated. Cooling device (1) according to one of the preceding claims, wherein the riser pipe (2) has an angled section (2a) which is located in the upper region of the riser pipe (2) and/or the heat exchanger (3) is adapted to allow ambient air flows into it in a radial direction. Cooling device (1) according to one of the preceding claims, wherein the heat exchanger (3) essentially has a hollow-cylindrical shape. Cooling device (1) according to one of the preceding claims, wherein the heat exchanger (3) is a lamellar heat exchanger and has spaced-apart flow tubes (3R) and lamellae (3L) spaced apart, and/or wherein the heat exchanger (3) extends upwards from an upper Plate (5) is limited with an opening for connection to the riser pipe (2). Cooling device (1) according to any one of the preceding claims, wherein the heat exchanger (3) comprises tubes (3R) and/or fins (3L) containing copper, aluminum or an alloy thereof. Cooling device (1) according to one of the preceding claims, wherein the heat exchanger (3) is limited at the bottom by a base plate (6) with an opening (6a), the opening being closable with a cover (6b), the opening being open when the Cover (6b) serves as a drain during cleaning of the heat exchanger (3). Cooling device (1) according to one of the preceding claims, wherein the ventilation device (4) is arranged directly above the heat exchanger (3) or in the riser pipe (2). System consisting of several cooling devices (1) according to one of Claims 1 until 8th . System according to the preceding claim, wherein the angled sections (2a) of the risers (2) have a horizontal component in their direction of extension, which are directed towards the center of the space to be air-conditioned, wherein the cooling devices (1) are designed and arranged in such a way that a buffer zone (P) provided for heating is formed below the ceiling of the room to be air-conditioned, and the area above the floor with homogeneous temperature stratification is sealed off from the buffer zone (P) by a mixing area (M) in order to achieve highly efficient air conditioning of the room.

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