JP2021018000A - Separately installed air conditioning system - Google Patents

Abstract

To provide a separately installed air conditioning system capable of reducing facility and running costs.SOLUTION: A separately installed air conditioning system comprises: an external air conditioner (4) that has a heat pump (50) capable of switching between cooling operation and heating operation, and exchanges heat with refrigerant for heat exchange of the heat pump (50) to supply the air; a heat exchange unit (5) having a heat exchanger (20) that selectively circulates cold water or hot water as water for heat exchange; a fan unit (7) that takes the outside air supplied from the external air conditioner (4) and return air of an air-conditioned space into the heat exchange unit (5), and exchanges heat with the water for heat exchange of the heat exchanger (20) to supply the air as air-conditioning air; and an attracting radiation unit (6) that attracts and mixes the return air in the air-conditioned space with the air-conditioning air supplied from the fan unit (7), discharges this mixed air to the air-conditioned space, and then radiates the heat of the mixed air. The external air conditioner (4), the fan unit (7) and the attracting radiation unit (6) are installed on the ceiling of the air-conditioned space, and the heat exchange unit (5) is installed in a machine room (R).SELECTED DRAWING: Figure 3

Description

The present invention relates to a separate installation air conditioning system.

Conventionally, the air conditioning system of a building connects an outdoor cold / hot water heat source unit and an indoor cold / hot water air conditioner with a water pipe, and supplies air conditioning air from the cold / hot water air conditioner to the room using a duct. , It is configured to introduce outside air so that the carbon dioxide in the room does not exceed the standard value. Alternatively, the heat pump type outdoor unit and the indoor unit are connected by a refrigerant pipe without using cold / hot water.

Japanese Unexamined Patent Publication No. 2016-217561 Japanese Unexamined Patent Publication No. 2000-274777 Japanese Unexamined Patent Publication No. 2001-280859

In the case of the cold / hot water type, since the air conditioner is installed on the floor, there is a problem that a machine room dedicated to the air conditioner is required in the building and the rentable ratio is lowered. Furthermore, in order to simultaneously perform cooling operation and heating operation with a cold / hot water type air conditioner, a water heat source facility called a 4-tube type that simultaneously sends cold water and hot water to the cold / hot water type air conditioner is required, and the equipment cost and operating cost are high. Become. On the other hand, in a water heat source facility that switches between cold water and hot water, which is called a two-tube type, and sends it to a cold / hot water type air conditioner, there is a problem that the cooling operation and the heating operation cannot be performed at the same time, and the comfort is impaired.

In addition, the air conditioner is equipped with a heat exchanger that exchanges heat between the air conditioning air and the heat exchange water, adjusts the heat exchange amount by increasing or decreasing the flow rate of the heat exchange water, and cools or heats the air conditioning air. Controls the ability to do. By dividing the heat transfer tube group of this heat exchanger into two groups equally, the lower limit flow rate of the heat exchange water is reduced and the lower limit capacity control range of the heat exchange coil is expanded. However, since the heat transfer tube group is divided into equal parts, there is a limit to the lower limit flow rate of heat exchange water, and in a low air conditioning load region where a small amount of heat exchange (through heat amount) is sufficient, the capacity becomes excessive and it is overcooled or overheated. There is a problem that the temperature difference of the heat exchange water generated by the heat exchange of the heat exchanger is not constant.

In addition, in buildings such as buildings where multiple tenants are occupying, air conditioning is performed by sharing a heat source unit such as a chiller, and it is necessary to prorate and charge the air conditioning fee for each tenant. As a billing system for that purpose, there is a system in which the air conditioning charge is calculated and apportioned from the product of the opening degree of the water amount control valve of the heat exchanger provided in the air conditioner and the operating time. In such a billing system, the amount of water flowing through the heat exchange coil can be calculated, but since the amount of energy actually used for heat exchange is unknown, there is a problem that the calculation of the air conditioning charge is not accurate.

In order to solve the above problems, the present invention has an external conditioner which has a heat pump capable of switching between cooling operation and heating operation and exchanges heat with the heat exchange refrigerant of the heat pump to supply air, and cold water which is heat exchange water. Alternatively, the heat exchanger unit having a heat exchanger for selectively flowing hot water, and the outside air supplied from the external conditioner and the return air of the air-conditioned space are taken into the heat exchange unit. The fan unit that exchanges heat with the heat exchange water and supplies air as air conditioning air and the air conditioning air supplied from the fan unit attracts and mixes the return air of the air-conditioned space and mixes the air. An attractive radiation unit that radiates the heat of the mixed air while discharging air to the air-conditioned space is provided, and the external conditioner, the fan unit, and the attractive radiation unit are installed on the ceiling of the air-conditioned space. The most important feature is that the heat exchange unit is installed in the machine room.

According to the inventions of claims 1 and 2, the heat exchange unit and the fan unit, which are usually integrally installed, are separated and separated, and the external conditioner, the fan unit, and the attracting radiation unit are used as the ceiling, and the heat exchange unit is used as the machine room. Since each is installed, the machine room can be narrowed, labor can be saved, and the rentable ratio can be increased.
Since it is only necessary to provide a 2-tube type water heat source equipment and a heat pump type external air conditioner, the equipment and operation costs can be reduced as compared with the 4-tube type water heat source equipment.
In the middle period when both cooling and heating are required, the heat pump type external air conditioner can freely switch between cooling operation and heating operation, improving comfort. Moreover, energy saving is improved because the outside air can be cooled and the water heat source equipment used for operating the heat exchange unit can be stopped.
Since the air is treated in two stages, the external controller and the heat exchange unit, it has excellent dehumidifying and humidifying effects.
Due to the action of heat radiation from the attract radiation unit, there is no temperature unevenness and the comfort of the air-conditioned space is improved.
Since the air-conditioning air and the return air can be attracted and mixed by the attracting radiation unit to bring the temperature of the mixed air close to the temperature of the air-conditioned space, there is no cold draft and the effect of preventing dew condensation during cooling can be obtained.

According to the invention of claim 2, by combining the first and second operation patterns, it is possible to finely respond to fluctuations in the air conditioning load of the air-conditioned space, so that excess or deficiency of the air conditioning capacity does not occur and wasteful energy consumption occurs. Eliminates and improves energy efficiency.
Since the heat is radiated by the attracting radiation unit, the air conditioning range is not biased, and even if any set of air conditioning equipment is stopped, the air conditioning of the entire air-conditioned space can be covered, and comfort is not impaired.
According to the third aspect of the invention, the operating time of the air conditioner can be averaged and the life can be extended by the third operation pattern.

According to the invention of claim 4, since the external air conditioner is provided with an integrated heat pump that does not require a refrigerant pipe, the equipment cost and the operating cost can be reduced as compared with the separate type heat pump type air conditioner.
Since the return air, which has a higher exergy than the outside air, is used as a heat source, it is possible to improve energy saving and reduce defrost operation.
Since it can be ventilated by an external air conditioner, it is not necessary to install a separate ventilation device, and the equipment cost can be reduced.
Maintenance is easy because the heat pump can be taken in and out from the bottom of the external air conditioner by the slide mechanism without lowering the entire external air conditioner from the ceiling.

According to the invention of claim 5, since the temperature of the air-conditioned space is adjusted by both the flow rate of the heat exchange water and the air supply air volume (the temperature adjustment of only the water amount control of the heat exchange water or only the air supply air volume control). (Compared to this) It is possible to mitigate excessive fluctuations in air conditioning capacity (overcooling and overheating), suppress overshoot of indoor temperature, and perform air conditioning with excellent stability and comfort.
Even if the air conditioning load fluctuates, the temperature difference of the heat exchange water is controlled to be constant, and the temperature of the air-conditioned space is controlled by increasing or decreasing the amount of air supply air, so comfort can be maintained.
In the case of a low air conditioning load, the lower limit flow rate can be further minimized by increasing or decreasing the flow rate of heat exchange water in the first group of the shunt circuit. Therefore, the lower limit capacity control range of the heat exchanger is widened so that the capacity is not excessive even in the case of a low air-conditioning load, energy waste, overcooling and overheating are eliminated, and energy saving and comfort are improved.
Since the temperature difference of the heat exchange water is controlled to be constant even when the air conditioning load is low, the heat exchange unit can be operated with a small amount of water and a large temperature difference. You can save energy on the machine.

According to the invention of claim 6, the heat exchange water is circulated to the first group during cooling so as not to be circulated to the second group, and the supercooled dehumidified air passing through the first group passes through the non-overlapping zone. By reheating with bypass air having a temperature higher than that of the supercooled dehumidified air, dry air without an unpleasant cooling sensation can be obtained. At this time, since the supercooled dehumidified air is sandwiched between the bypass airs so as not to escape, mixing is promoted and reheating can be reliably performed. Therefore, even in the middle period when the humidity is high and it gets damp, air conditioning can be performed with a crisp air flow without cold draft, and comfort is improved. Moreover, equipment such as a bypass damper is not required, and cost reduction and compactness can be achieved.

According to the invention of claim 7, the temperature difference of the heat exchange water can be controlled to be constant, and the energy consumption of the air-conditioned space can be calculated based on the temperature difference of the heat exchange water and the flow rate of the heat exchange water. Therefore, the air-conditioning charge can be accurately calculated and apportioned by comparing the energy consumption of each air-conditioned space.
Since it is only necessary to measure the flow rate and temperature of the heat exchange water, the operation of the heat exchange unit and the output of energy consumption can be performed with one control device, so that the equipment and construction can be simplified and the cost can be reduced.

According to the invention of claim 8, since the number of operating heat source machines is increased or decreased according to the increase or decrease in the energy consumption of the heat exchange unit, the energy waste of the heat source unit can be suppressed and energy saving can be achieved.
According to the invention of claim 9, the dead water region of the heat transfer tube group is reduced, the ventilation resistance of the heat transfer tube group is small, energy is saved, the contact area with air conditioning air (through heat amount) is increased, and the heat exchange efficiency is improved. To do. Therefore, it is possible to operate with a small amount of water and a large temperature difference without increasing (increasing the size) the heat transfer area of the heat exchanger.

It is a simplified plan view of the separate installation air-conditioning system of this invention. It is a simplified side view of FIG. It is a simplified explanatory drawing of an air conditioner. It is a perspective view which shows the heat exchanger. It is a simplified explanatory view of the arrow A view of FIG. It is a simplified explanatory view of the arrow B view of FIG. It is a side sectional view of an external conditioner. It is a perspective view of the attraction radiation unit. It is sectional drawing of the attract radiation unit. It is a flowchart which shows an example of the air-conditioning operation. It is a simplified plan view which shows the other embodiment of the separate installation air conditioning system.

1 to 3 are an embodiment of the separate installation air conditioning system of the present invention. The separate installation air conditioning system includes an air conditioner 1, a heat exchange unit 5, a water heat source facility 2, and a control device 3, and includes a building and the like. Installed in the building of. Two or more sets of the air conditioner 1 are installed on the ceiling of one or a plurality of air-conditioned spaces S in the building, and the heat exchange unit 5 is installed in the machine room R. The air-conditioned space S is formed by partitioning each floor of the building by a ceiling, a floor, a wall, or the like. The air conditioner 1 includes an external air conditioner 4, a fan unit 7, and an attractive radiation unit 6. The thick dotted arrow in each figure indicates the direction of air flow.

The external air conditioner 4 has a heat pump 50 capable of switching between cooling operation and heating operation, and uses the return air of the air-conditioned space S as heat source air. The outside air (OA) is heat-exchanged (cooled or heated) with the heat exchange refrigerant of the heat pump 50 to supply air (SA). The heat exchange unit 5 has a heat exchanger 20 for water that selectively circulates cold water or hot water as heat exchange water. With the heat exchange water of the heat exchanger 20, the outside air supplied from the external air conditioner 4 and the return air (RA) of the air-conditioned space S are heat-exchanged (cooled or heated), and the fan unit 7 is used as air-conditioning air. Air supply (SA) at. Alternatively, only the outside air or the mixed air of the outside air and the return air is supplied by the fan unit 7 as air conditioning air without heat exchange with the heat exchange water of the heat exchanger 20.

The attracting radiation unit 6 attracts and mixes the return air of the air-conditioned space S with the air-conditioning air supplied from the heat exchange unit 5, and radiates the heat of the mixed air while discharging the mixed air to the air-conditioned space S. To do. The attraction radiation unit 6, the fan unit 7, the machine room R, the heat exchange unit 5, the external air conditioner 4, and the outdoor are connected to each other via a duct 15 so that air can flow. The duct 15 is shown simply by a thick solid line in FIGS. 1 and 2. In the illustrated example, the air conditioner 1 is installed in the ceiling pocket provided by partitioning the air-conditioned space S by the ceiling plate 8. The ceiling pocket is used as a ceiling chamber, and the return air of the air-conditioned space S is taken into the ceiling pocket from the air intake 9 provided in the ceiling plate 8.

The water heat source equipment 2 is a two-tube type and includes a heat source machine 10 and a circulation device 11. The heat source machine 10 cools or heats the heat exchange water provided in the heat exchanger 20 of the heat exchange unit 5, and adjusts the water temperature so that the water becomes cold water or hot water suitable for heat exchange. A plurality of heat source machines 10 are provided so that each unit can be individually started and stopped and can switch between cold water and hot water. The circulation device 11 circulates heat exchange water between the heat source machine 10 and the heat exchange unit 5. The circulation device 11 includes an outgoing pipe 12 that sends heat exchange water from the heat source machine 10 to the heat exchange unit 5, a return pipe 13 that returns the heat exchange unit 5 to the heat source machine 10, and a pump 14 that conveys the heat exchange water. I have.

The heat exchange unit 5 includes a heat exchanger 20, a valve 33 that adjusts the flow rate of heat exchange water flowing through the heat exchanger 20, a humidifier 21 that humidifies the air that has passed through the heat exchanger 20, and a heat exchanger 20. It includes a casing 24 that houses the humidifier 21 and the fan 22. The casing 24 is provided with an outside air port 16 and a return air port 26. The machine room R is used as an air mixing chamber, and the return air of the air-conditioned space S is taken in from the air intake 17 provided in the machine room R.

The fan unit 7 includes an air supply fan 22, a rotation controller 23 that adjusts the air supply air volume by steplessly or stepwise controlling the rotation speed of the fan 22, and a branch chamber portion 25 that divides air. There is. The branch chamber portion 25 is connected to a plurality of attractive radiation units 6 via a duct 15. The fan 22 uses the outside air supplied from the external air conditioner 4 and the return air taken in from the air-conditioned space S through the air intake port 17 and the return air port 26 to the heat exchanger 20 of the heat exchange unit 5 and the return air. It is passed through the humidifier 21 and blown from the branch chamber portion 25 to the attracting radiation unit 6 through the duct 15.

As shown in FIGS. 4 to 6, the heat exchanger 20 includes a fin group 27 and a flow dividing circuit 28. The fin group 27 is composed of a large number of plate fins 29 arranged so as to allow air for air conditioning to pass through. The shunt circuit 28 distributes the heat transfer tube group 30 through which the heat exchange water flows to a plurality of groups G and has different distribution ratios. As a result, the heat transfer area (heat exchange amount) of some or all of the group G is made different. For example, the first group G (G1) having a single and minimum distribution ratio shown by the thick alternate long and short dash line in FIG. 5 and the second group G (G1) having a large distribution ratio shown by the thin alternate long and short dash line in FIG. 5 excluding the first group (G1). Divide into group G (G2). The heat transfer tube group 30 meanders across the air flow direction of the air conditioning air and is connected to the fin group 27. The straight tube portion of the heat transfer tube group 30 is preferably formed of an elliptical tube, but may be a circular tube.

The heat exchange water inlet of the first group G1 is connected to the first branch header 31, and the heat exchange water inlet of the second group G2 is connected to the second branch header 31. Both the heat exchange water outlets of the first group G1 and the second group G2 are connected to the merging header 32. The branch header 31 is connected to the outgoing pipe 12 via the valve 33, and the merging header 32 is connected to the return pipe 13. The valve 33 is a proportional control valve capable of steplessly adjusting the flow rate (valve opening degree), and is provided in each group G of the shunt circuit 28. The increase / decrease in the cooling capacity and the heating capacity of the heat exchange unit 5 is adjusted by combining the flow rate control of the heat exchange water flowing through the shunt circuit 28 and the air supply air volume control of the fan 22. In the shunt circuit 28, a plurality of non-overlapping zones F that do not overlap with the first group G1 are formed in the second group G2 when viewed from the direction of the air flow passing through the heat exchanger 20, and the first group G1 Is configured to be sandwiched between non-overlapping zones F.

As shown in FIGS. 3 and 7, the external air conditioner 4 includes a heat pump 50, a humidifier 40 that humidifies the outside air, and an outside air supply that supplies the outside air (OA) from the external air conditioner 4 to the heat exchange unit 5. The rotation speeds of the air fan 41, the heat source air exhaust fan 42 that exhausts the return air (RA) to the outside (EA), the outside air air supply fan 41, and the heat source air exhaust fan 42 are steplessly or stepwise controlled. It includes a rotation controller 43 for adjusting the supply air volume and the exhaust air volume, a casing 45 for incorporating them, and a slide mechanism 46 for moving the heat pump 50 in and out from the bottom of the casing 45. The casing 45 is provided with a return air port 54.

The slide mechanism 46 includes a frame 47 to which the heat pump 50 is attached, and a damper 48 for moving the frame 47 up and down. The damper 48 is provided so as to straddle the casing 45 and the frame 47. For maintenance and inspection of the external air conditioner 4, the inspection port 44 provided on the ceiling plate 8 is opened, the exterior plate 49 closing the opening on the bottom surface of the casing 45 is removed, and the heat pump 50 is installed together with the frame 47 using the slide mechanism 46. Take it down. The damper 48 expands and contracts due to the pressure of gas or oil to reduce the physical burden on the operator.

As shown in FIG. 3, the heat pump 50 is an integrated type having a heat exchanger 51 for outside air, a heat exchanger 52 for heat source air, and a compressor 53, which does not require refrigerant piping work. The outside air supply fan 41 takes in outside air from the outside through the duct 15, passes it through the outside air heat exchanger 51, and blows air from the external controller 4 to the heat exchange unit 5 via the duct 15 and the machine room R. And supply. In the illustrated example, the machine room R and the external air conditioner 4 are connected by the duct 15, but the external air conditioner 4 and the heat exchange unit 5 may be connected by the duct 15. The heat source air exhaust fan 42 takes in return air from the air-conditioned space S through the air intake port 9 and the return air port 54, passes it through the heat source air heat exchanger 52, and passes the duct 15 from the external air conditioner 4. Exhaust to the outside through.

The heat pump 50 repeats the steps of compression, condensation, expansion, and evaporation of the refrigerant, and absorbs heat from the air that exchanges heat with the refrigerant in the refrigerant evaporation step and dissipates heat in the refrigerant condensation step. The heat pump 50 expands the refrigerant, the outside air heat exchanger 51 and the heat source air heat exchanger 52, which are the refrigerant evaporation process and the refrigerant condensation process, and the compressor 53 that compresses and conveys the refrigerant. It is provided with at least a pressure reducing mechanism 55 such as an expansion valve to be operated, and a switching mechanism 56 such as a valve for switching between the evaporation process and the condensation process of the heat exchanger 51 for outside air and the heat exchanger 52 for heat source air, and the refrigerant circulates therein. It consists of connecting pipes like this.

In the heat exchanger 51 for outside air and the heat exchanger 52 for heat source air, the heat transfer tubes through which the heat exchange refrigerant flows are connected to the fins through which the air passes, similarly to the heat exchanger 20 of the heat exchange unit 5. In the structure, the heat exchange refrigerant and the passing air exchange heat via the heat transfer tube group and the fin group (not shown). The heat transfer tube group is preferably formed of an elliptical tube, but may be a circular tube. The increase / decrease in the cooling capacity and the heating capacity of the external air conditioner 4 is adjusted by combining the outside air cooling or heating capacity control of the outside air heat exchanger 51 and the supply air volume control of the outside air supply fan 41.

As shown in FIGS. 8 and 9, the attraction radiation unit 6 includes an air supply unit 60, an air attraction unit 61, and an air mixing unit 62, and an air-conditioned space is provided on the bottom surface of the air mixing unit 62 from the opening of the ceiling plate 8. Install in a state facing S. The air supply unit 60 jets the supply air of the heat exchange unit 5, and the air attraction unit 61 draws the return air of the air-conditioned space S by the action of attracting the jet air. The air mixing unit 62 includes a plate 63 for storing the heat of the mixed air and a group of through holes 64, and radiates heat from the plate 63 to the air-conditioned space S through the through holes 64 while radiating the mixed air to the air-conditioned space S. Release to.

As shown in FIGS. 2 and 5, the control device 3 includes a setting unit 70 for setting the temperature and humidity of the air-conditioned space S and a temperature difference between the heat exchange water, an air condition detection unit 71, and a water condition detection unit 72. The air conditioning control unit 73, the temperature compensation unit 74, the energy consumption monitoring unit 75, and the heat source control unit 76 are provided, and these are composed of a microprocessor, various sensors, switches, and other control devices.

The air condition detection unit 71 includes a return air sensor 77 that detects the temperature and humidity of the air (return air) in the air-conditioned space S. The water state detection unit 72 includes a flow meter 78 that detects the flow rate of the heat exchange water in each air-conditioned space S, and a water temperature meter 79 that detects the inlet water temperature and the outlet water temperature of the heat exchange water of the heat exchanger 20. .. The flow meter 78 is provided in the forward pipe 12 or the return pipe 13 of each air-conditioned space S, and the water temperature gauge 79 is provided in the forward pipe 12 and the return pipe 13 connected to the heat exchanger 20 of each heat exchange unit 5. The water state detection unit 72 may be a calorimeter in which a flow meter 78 and a water temperature gauge 79 are integrated.

The air conditioning control unit 73 heats the external conditioner 4 and heat so that the temperature and humidity of the air in the air-conditioned space S detected by the air detection unit 46 becomes the temperature and humidity of the air-conditioned space S set by the setting unit 70. The cooling capacity and heating capacity of the exchange unit 5 are controlled, and the humidification amounts of the humidifiers 21 and 40 of the external air conditioner 4 and the heat exchange unit 5 are controlled. Further, the air conditioning control unit 73 switches between the first operation pattern in which the air conditioning device 1 is operated and stopped in groups, and the single operation of the external air conditioner 4 and the simultaneous operation of the external air conditioner 4 and the heat exchange unit 5. The second operation pattern, the third operation pattern in which the air-conditioning device 1 in operation and the air-conditioning device 1 in stop are replaced, and the air-conditioning capacity of one or both of the external conditioner 4 and the heat exchange unit 5 are increased or decreased. The air-conditioned space S is air-conditioned by switching or combining the first to fourth operation patterns.

For example, as the difference between the temperature and humidity of the air in the air-conditioned space S and the preset temperature and humidity (air-conditioning load) decreases, the operation pattern of the air-conditioning device 1 is switched in the order of first and second. To reduce the air conditioning capacity. When the first, second, and fourth operation patterns are combined, the control range of the temperature and humidity of the air-conditioned space S is expanded, and more detailed air conditioning can be performed. When the third operation pattern is additionally combined with these operation patterns, the operation is not biased only to the specific air conditioner 1.

In the above operation pattern, the external air conditioner 4 is operated by operating the compressor 53 of the heat pump 50, the outside air supply fan 41, and the heat source air exhaust fan 42, and the heat exchange unit 5 is operated. Is performed by opening each valve 33 to circulate heat exchange water through the heat exchanger 20 and operating the fan 22 of the fan unit 7. The external air conditioner 4 is stopped by stopping the compressor 53 of the heat pump 50, and the heat exchange unit 5 is stopped by fully closing each valve 33 to stop the flow of heat exchange water in the heat exchanger 20.

The temperature compensation unit 74 increases or decreases the flow rate of the heat exchange water in the first group G1 of the flow dividing circuit 28 in the case of a low air conditioning load, and constantly controls the temperature difference of the heat exchange water generated by the heat exchange of the heat exchanger 20. At the same time, the temperature of the air-conditioned space S is controlled by increasing or decreasing the air supply air volume of the heat exchange unit 5. Further, the temperature compensation unit 74 increases or decreases the flow rate of the heat exchange water in all groups G in the case of a high air conditioning load to control the temperature difference of the heat exchange water to be constant, and between the high air conditioning load and the low air conditioning load. In the case of the normal air conditioning load of, the second group G2 increases or decreases the flow rate of the heat exchange water to control the temperature difference of the heat exchange water to be constant. As a result, the heat exchange unit 5 covers a wide range from high air-conditioning loads that require the maximum heat exchange amount such as midsummer and midwinter to low air-conditioning loads that require a small amount of heat exchange such as the middle period. It can handle small water volume and large temperature difference operation.

The energy consumption monitoring unit 75 is air-conditioned based on the flow rate of the heat exchange water provided to the heat exchanger 20 of the heat exchange unit 5 and the temperature difference of the heat exchange water generated by the heat exchange of the heat exchanger 20. The energy consumption for each space S is calculated and output as data. The heat source control unit 76 outputs a signal for increasing or decreasing the number of operating heat source machines 10 according to the increase or decrease in the energy consumption of all the air-conditioned spaces S data output by the energy consumption monitoring unit 75.

FIG. 10 shows an example of air conditioning operation. After the start of the air conditioning operation, the external air conditioner 4 is not operated and only the heat exchange unit 5 is operated to maximize the flow rate of the heat exchange water of the heat exchanger 20 and the air supply air volume of the fan 22 to perform the warm-up operation. When the temperature of the air-conditioned space S (return air temperature) falls within the allowable range of the return air temperature set in advance, the operation of the external air conditioner 4 is started. After that, when the temperature difference (water temperature difference) of the heat exchange water generated by the heat exchange of the heat exchanger 20 of the heat exchange unit 5 is out of the preset allowable range of the water temperature difference, the temperature difference is brought closer to the set water temperature difference. The flow rate of heat exchange water in the heat exchanger 20 is controlled. When the return air temperature deviates from the allowable range of the set return air temperature by this process, the supply air volume of the fan 22 is controlled so as to approach the set return air temperature. These processes are repeated until the air conditioning operation of the heat exchange unit 5 is stopped.

The present invention is not limited to the above-mentioned examples. In the embodiment of FIG. 1, the air conditioner 1 is a set of the external air conditioner 4, the fan unit 7, and the attractive radiation unit 6, but as shown in FIG. 11, the external air conditioner 4, the heat exchange unit 5, and the fan are used. The air conditioner 1 may be a set of the unit 7 and the attracting radiation unit 6. Further, the number of sets of the air conditioner 1 may be increased or decreased according to the design air conditioning capacity, or if the required air conditioning capacity is exceeded, the external air conditioner 4 of an appropriate set of the air conditioner 1 may be omitted. In the illustrated example, the group G of the shunt circuit 28 is distributed to two groups G1 and G2, but it is also free to distribute the group G to three or more groups G and set one group G as the minimum distribution ratio. Although the attracting radiation unit 6 is installed on the ceiling plate 8, it may be installed on the wall surface forming the air-conditioned space S. Further, the air conditioner 1 may be installed on the ceiling with the ceiling plate 8 omitted.

1 Air conditioner 3 Control device 4 External conditioner 5 Heat exchange unit 6 Induction radiation unit 7 Fan unit 10 Heat source machine 20 Heat exchanger 28 Divided circuit 30 Heat transfer tube group 45 Casing 46 Slide mechanism 50 Heat pump 51 Outside air heat exchanger 52 Heat source Heat exchanger for air 53 Compressor 73 Air conditioning control unit 74 Temperature compensation unit 75 Energy consumption monitoring unit 76 Heat source control unit F Non-overlapping zone G Group R Machine room S Air-conditioned space

According to the inventions of claims 1 and 2, since the heat exchange unit and the fan unit, which are usually integrally installed, are separated and installed in the ceiling and the machine room, respectively, the machine room can be narrowed for construction. Labor saving can be achieved and the rentable ratio can be increased.
Since it is only necessary to provide a 2-tube type water heat source equipment and a heat pump type external air conditioner, the equipment and operation costs can be reduced as compared with the 4-tube type water heat source equipment.
In the middle period when both cooling and heating are required, the heat pump type external air conditioner can freely switch between cooling operation and heating operation, improving comfort. Moreover, energy saving is improved because the outside air can be cooled and the water heat source equipment used for operating the heat exchange unit can be stopped.
Since the air is processed in two stages, the external controller and the heat exchange unit, it has excellent dehumidifying and humidifying effects.
Due to the action of heat radiation from the attract radiation unit, there is no temperature unevenness and the comfort of the air-conditioned space is improved.
Since the air-conditioning air and the return air can be attracted and mixed by the attracting radiation unit to bring the temperature of the mixed air close to the temperature of the air-conditioned space, there is no cold draft and the effect of preventing dew condensation during cooling can be obtained.
In the case of a low air conditioning load, the lower limit flow rate can be further minimized by increasing or decreasing the flow rate of heat exchange water in the first group of the heat exchanger diversion circuit. Therefore, the lower limit capacity control range of the heat exchanger is widened so that the capacity is not excessive even in the case of a low air-conditioning load, energy waste, overcooling and overheating are eliminated, and energy saving and comfort are improved.
Even when the air conditioning load is low, the temperature difference of the heat exchange water of the heat exchanger is controlled to be constant, so the heat exchange unit can be operated with a small amount of water and a large temperature difference. It is possible to save energy in the heat source machine by making a difference.
During cooling, the heat exchange water is circulated to the first group of the heat exchanger's diversion circuit so that it is not circulated to the second group, and the supercooled dehumidified air that has passed through the first group has passed through the non-overlapping zone. By reheating with bypass air that is hotter than supercooled dehumidified air, it is possible to obtain dry air without an unpleasant feeling of coldness. At this time, since the supercooled dehumidified air is sandwiched between the bypass airs so as not to escape, mixing is promoted and reheating can be reliably performed. Therefore, even in the middle period when the humidity is high and it gets damp, air conditioning can be performed with a crisp air flow without cold draft, and comfort is improved. Moreover, equipment such as a bypass damper is not required, and cost reduction and compactness can be achieved.

According to the invention of claim 5, the temperature difference of the heat exchange water of the heat exchanger is controlled to be constant, and the energy consumption of the air-conditioned space is based on the temperature difference of the heat exchange water and the flow rate of the heat exchange water. Can be calculated. Therefore, the air-conditioning charge can be accurately calculated and apportioned by comparing the energy consumption of each air-conditioned space.
Since it is only necessary to measure the flow rate and temperature of the heat exchange water, the operation of the heat exchange unit and the output of energy consumption can be performed with one control device, so that the equipment and construction can be simplified and the cost can be reduced.

According to the invention of claim 6 , since the number of operating heat source machines is increased or decreased according to the increase or decrease in the energy consumption of the heat exchange unit, the energy waste of the heat source unit can be suppressed and energy saving can be achieved.
According to the invention of claim 7, the dead water region of the heat transfer tube group of the heat exchanger is reduced, the ventilation resistance of the heat transfer tube group is small to save energy, and the contact area (through heat amount) with the air conditioning air is increased to heat. Exchange efficiency is improved. Therefore, it is possible to operate with a small amount of water and a large temperature difference without increasing (increasing the size) the heat transfer area of the heat exchanger.

Claims (9)

An external air conditioner (4) having a heat pump (50) capable of switching between cooling operation and heating operation and exchanging heat with the heat exchange refrigerant of the heat pump (50) to supply air, and cold water or heat exchange water. The heat exchange unit (5) having a heat exchanger (20) for selectively flowing hot water, the outside air supplied from the external conditioner (4), and the return air of the air-conditioned space (S) are described. A fan unit (7) that takes in heat exchange unit (5) and exchanges heat with the heat exchange water of the heat exchanger (20) to supply air as air conditioning air, and air supply from the fan unit (7). An attracting radiation unit that attracts and mixes the return air of the air-conditioned space (S) with the air-conditioning air, and radiates the heat of the mixed air while discharging the mixed air to the air-conditioned space (S). 6), the external air conditioner (4), the fan unit (7), and the attracting radiation unit (6) are installed on the ceiling of the air-conditioned space (S), and the heat exchange unit (5) is provided. A separate installation air conditioning system characterized by the fact that is installed in the machine room (R). An air conditioner (1) in which the external conditioner (4), the fan unit (7), and the attractive radiation unit (6) are a set, or the external conditioner (4) and the heat exchange unit (5). ), The fan unit (7), and the air-conditioning device (1) which is a set of the attracting radiation unit (6), and also includes a control device (3), and the control device (3) has two sets. The first operation pattern in which the operation and stop of the air conditioner (1) are performed in groups, the single operation of the external air conditioner (4), the external air conditioner (4), and the heat exchange unit (5). The separate installation air-conditioning system according to claim 1, further comprising an air-conditioning control unit (73) for air-conditioning the air-conditioned space (S) using a second operation pattern for switching between the simultaneous operations of the above. The separate installation air conditioning system according to claim 2, wherein the air conditioning control unit (73) has a third operation pattern in which the operating air conditioning device (1) and the stopped air conditioning device (1) are replaced. The external air conditioner (4) uses the return air of the air-conditioned space (S) as heat source air, and is an outside air heat exchanger (51), a heat source air heat exchanger (52), and a compressor. An integrated heat pump (50) having (53), a casing (45) containing the heat pump (50), and a slide mechanism (50) for moving the heat pump (50) in and out from the bottom of the casing (45). 46), the separate installation air conditioning system according to any one of claims 1 to 3. The heat exchanger (20) of the heat exchange unit (5) distributes the heat transfer tube group (30) through which the heat exchange water flows to a plurality of groups (G) and has different distribution ratios. The control device (3) includes a diversion circuit (28), and the control device (3) is a single group (G1) of the diversion circuit (28) having a minimum distribution ratio in the case of a low air conditioning load. The temperature difference of the heat exchange water generated by the heat exchange of the heat exchanger (20) is controlled to be constant, and the air supply air volume of the fan unit (7) is increased or decreased to increase or decrease the air-conditioned space (S). The separate installation air conditioning system according to any one of claims 2 to 4, further comprising a temperature compensation unit (74) for controlling the temperature of the above. The second group (G1) excluding the first group (G1) of the shunt circuit (28) when viewed from the air flow direction of the air passing through the heat exchanger (20) of the heat exchange unit (5). A non-overlapping zone (F) that does not overlap with the first group (G1) is formed in G2), and the shunt circuit is formed so that the first group (G1) is sandwiched between the non-overlapping zones (F). The separate installation air conditioning system according to claim 5, which comprises (28). The control device (3) is the heat exchange water generated by the heat exchange between the flow rate of the heat exchange water provided to the heat exchanger (20) of the heat exchange unit (5) and the heat exchange of the heat exchanger (20). The separate installation air conditioning system according to any one of claims 2 to 6, further comprising an energy consumption monitoring unit (75) that calculates and outputs the energy consumption of the air-conditioned space (S) based on the temperature difference of the above. .. The control device (3) is provided with a plurality of heat source machines (10) for cooling or heating the heat exchange water provided in the heat exchanger (20) of the heat exchange unit (5) to adjust the water temperature. Is a heat source control that outputs a signal for increasing or decreasing the number of operating units of the heat source machine (10) according to an increase or decrease in the energy consumption of the air-conditioned space (S) output by the energy consumption monitoring unit (75). The separate installation air conditioning system according to claim 7, further comprising a unit (76). The separate installation air conditioning system according to any one of claims 1 to 8, wherein the heat transfer tube group (30) of the heat exchanger (20) of the heat exchange unit (5) is formed of an elliptical tube.

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