JP2020098087A - Air conditioning system - Google Patents

Abstract

To provide an air conditioning system capable of reducing a load on a fan and separately treating latent heat/sensible heat and sensible heat by using a simple configuration.SOLUTION: An air conditioning system 10 includes: a first air conditioner 12 having a first coil 20; a second air conditioner 14 having a second coil 24; a low-temperature cold water circulation passage 26 selectively circulating low-temperature cold water to the first coil and the second coil; a high-temperature cold water circulation passage 28 selectively circulating high-temperature cold water to the first coil and the second coil; a supply passage 30 joining air that has undergone heat exchange in each of the first coil and the second coil and supplying the air to an air-conditioning target room 16; and a recirculation passage 32 recirculating the air in the air-conditioning target room to the first air conditioner and the second air conditioner. The air conditioning system includes a first mode of performing latent heat and sensible heat treatment of air by circulating the low-temperature cold water in the first coil, performing sensible heat treatment of air by circulating the high-temperature cold water in the second coil, joining the air in the supply passage and then, supplying the air to the air-conditioning target room.SELECTED DRAWING: Figure 2

Description

The present invention relates to an air conditioning system.

Patent Document 1 below discloses a first coil arranged in an air conditioning chamber into which an air-fuel mixture flows, a second coil arranged downstream of the first coil in the air conditioning chamber, and a second coil arranged in the air conditioning chamber. And an air blower that is disposed on the downstream side of the air blower and sends out the supply air toward the air conditioning room. In this air conditioning system, high temperature cold water is supplied to the first coil, and either low temperature cold water having a temperature lower than that of the high temperature cold water or hot water is supplied to the second coil.

Further, in Patent Document 2 below, a first air passage and a second air passage for taking in outside air or return air to supply air are provided in the air conditioner frame body, and the first coil is provided in the first air passage as the second air passage. An air conditioning system in which the second coils are arranged is disclosed. In this air conditioning system, low temperature cold water is supplied to the first coil to cool the air in the first air passage, and medium temperature cold water discharged from the first coil is supplied to the second coil to cool and drain the air. Further, the air in the first air passage and the air in the second air passage cooled in the air conditioner frame are mixed and supplied.

JP, 2005-7484, A JP, 2005-59692, A

In Patent Document 1, since the first coil and the second coil are arranged in series in the air conditioning chamber toward the downstream side in the air flow direction, the air resistance is large and the load on the fan is large.

In Patent Document 2, low-temperature cold water is supplied to the first coil to cool the air in the first air passage, and medium-temperature cold water discharged from the first coil is supplied to the second coil to cool the air and drain it. Then, the air in the first air passage and the second air passage cooled in the air conditioner frame is mixed and supplied in the air conditioner frame. Therefore, it is necessary to constantly supply low-temperature cold water, and there is room for improvement in order to realize energy saving.

In consideration of the above facts, the present invention separates latent heat/sensible heat (that is, latent heat and sensible heat, hereinafter, may be referred to as “latent heat/sensible heat”) and sensible heat with a simple configuration and a small load on the fan. It is an object to provide an air conditioning system that can be processed by means of.

An air conditioning system according to the invention of claim 1 is a first air conditioner having a first coil, a second air conditioner having a second coil, and low-temperature cold water selectively to the first coil and the second coil. A low temperature cold water circulation path, a high temperature cold water circulation path that selectively circulates high temperature cold water to the first coil and the second coil, and air that has undergone heat exchange with the first coil and the second coil. The first coil includes a supply passage that joins or supplies one of the air to the air conditioning target chamber, and a return passage that recirculates the air in the air conditioning target chamber to the first air conditioner and the second air conditioner. In the first mode, low temperature cold water is circulated to heat latent air and sensible heat of the air, high temperature cold water is circulated to the second coil to sensible heat of the air, and the air is merged in the supply passage and supplied to the air-conditioned room. Have.

According to the invention described in claim 1, the first air conditioner having the first coil and the second air conditioner having the second coil are provided, and the first coil and the first coil are provided by the low temperature cold water circulation path. Low temperature cold water is selectively circulated to the two coils. Further, the hot and cold water circulation passage selectively circulates the hot and cold water to the first coil and the second coil. Then, the air that has undergone heat exchange between the first coil of the first air conditioner and the second coil of the second air conditioner is joined by the supply passage, or one of the air is supplied to the air conditioning target room. In the first mode, low-temperature cold water is circulated in the first coil for latent heat and sensible heat treatment of air, and high-temperature cold water is circulated in the second coil for sensible heat treatment of air, and they are merged in the supply passage and supplied to the air-conditioned room. To do. As a result, the temperature and humidity of the air in the air-conditioned room are adjusted. Further, the air in the target room is circulated to the first air conditioner and the second air conditioner by the recirculation passage, thereby circulating the air between the first air conditioner and the second air conditioner and the target room. Therefore, latent heat/sensible heat (that is, latent heat and sensible heat) and sensible heat can be separated and processed with a simple configuration.

An air conditioning system according to a second aspect of the present invention is the air conditioning system according to the first aspect, wherein the first air conditioner or the second air conditioner is stopped to air-condition the target room. Have.

According to the second aspect of the present invention, in the second mode, either the first air conditioner or the second air conditioner is stopped to air-condition the target room. Therefore, for example, when one of the first air conditioner and the second air conditioner fails, by operating only the other of the first air conditioner and the second air conditioner to air-condition the target room, It can be used as a backup of time.

According to the air conditioning system of the present invention, the load on the fan is small, and the latent heat/sensible heat and the sensible heat can be separated and processed with a simple configuration.

It is a block diagram which shows the air conditioning system of 1st Embodiment. In the air conditioning system of the first embodiment, low temperature cold water is circulated in the first coil of the first air conditioner to perform latent heat/sensible heat treatment of air, and high temperature cold water is circulated in the second coil of the second air conditioner to expose air. It is a block diagram which shows the state of the 1st mode which heat-processes. It is a block diagram which shows the state which stopped the 2nd air conditioner in the air conditioning system of 1st Embodiment, and operated the 1st air conditioner only, and changed to the 2nd mode which air-conditions an air-conditioning target room. It is a psychrometric chart explaining the state change of the air in the 1st mode of the air conditioning system of 1st Embodiment. It is a block diagram which shows the air conditioning system of a comparative example. It is a psychrometric chart explaining the state change of the air in a comparative example.

Embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that each of the drawings is a schematic one, and illustrations of those having little relevance to the present invention are omitted.

[First Embodiment]
The air conditioning system of the first embodiment will be described with reference to FIGS.

(Configuration of air conditioning system)
FIG. 1 is a configuration diagram showing an air conditioning system. As shown in FIG. 1, the air conditioning system 10 includes a first air conditioner 12, a second air conditioner 14, and a room in which the temperature and relative humidity of air are adjusted by the first air conditioner 12 and the second air conditioner 14. A certain air-conditioned room 16 is provided. The first air conditioner 12 includes a housing 18, a first coil 20 arranged in the housing 18, and a fan 34 arranged in the housing 18 to blow air. The second air conditioner 14 includes a housing 22, a second coil 24 arranged in the housing 22, and a fan 36 arranged in the housing 22 for blowing air.

Further, the air conditioning system 10 has a low-temperature cold water circulation path 26 that selectively circulates low-temperature cold water to the first coil 20 and the second coil 24, and selectively circulates high-temperature cold water to the first coil 20 and the second coil 24. The hot and cold water circulation path 28 is provided. Further, the air conditioning system 10 merges the air from the first air conditioner 12 and the air from the second air conditioner 14 to supply the air to the air conditioning target chamber 16 and the air in the air conditioning target chamber 16 to the first air conditioning system. And a return passage 32 for returning the air to the machine 12 and the second air conditioner 14.

Hot cold water means cold water having a higher temperature than cold cold water. The high temperature cold water is set to, for example, 10° C. or higher and 20° C. or lower. The low temperature cold water is set to, for example, 5°C or higher and lower than 10°C.

The housing 18 of the first air conditioner 12 is a substantially rectangular box body. A downstream end of a first return passage 32E, which will be described later, of the return passage 32 is connected to one end of the housing 18 in the longitudinal direction. An upstream end of a first supply passage 30A, which will be described later, of the supply passage 30 is connected to the other end of the housing 18 in the longitudinal direction. In the housing 18, a fan 34 is arranged on the downstream side of the first coil 20 in the direction of air flow, and the fan 34 sucks the air that has been heat-exchanged in the first coil 20 to the first supply passage 30A. It is sent out to.

The housing 22 of the second air conditioner 14 is a substantially rectangular box body. A downstream end of a second return passage 32F, which will be described later, of the return passage 32 is connected to one end of the housing 22 in the longitudinal direction. An upstream end of a second supply passage 30B, which will be described later, of the supply passage 30 is connected to the other end of the housing 22 in the longitudinal direction. In the housing 22, a fan 36 is arranged on the downstream side of the second coil 24 in the direction of air flow in the housing 22, and the fan 36 sucks the heat-exchanged air in the second coil 24. It is sent out toward the second supply passage 30B.

The supply passage 30 includes a first supply passage 30A, a second supply passage 30B, and one main body connected to the downstream side of the first supply passage 30A and the downstream side of the second supply passage 30B via a merging portion 30C. And a passage 30D. Further, the supply passage 30 includes branch passages 30E and 30F that are branched from the main body passage 30D into a plurality (two in the present embodiment). The branch passages 30E and 30F are respectively connected to the air outlets 40 arranged in the air-conditioned chamber 16.

In the air conditioning system 10, the air heat-exchanged by the first coil 20 of the first air conditioner 12 is supplied to the first supply passage 30A, and the air heat-exchanged by the second coil 24 of the second air conditioner 14 is second. It is supplied to the supply passage 30B. Then, the air supplied to the first supply passage 30A and the air supplied to the second supply passage 30B are merged at the merging portion 30C and flow through the main body passage 30D, and the air is branched from the main body passage 30D into the branch passages 30E, 30F. And is supplied to the air-conditioned room 16.

The return passage 32 includes a plurality (two in the present embodiment) of air passages 32A and 32B, and one main body passage 32C to which the air passages 32A and 32B are connected via a merging portion. The air passages 32A and 32B are respectively connected to the air intake ports 42 arranged in the air-conditioned room 16. Further, the return passage 32 includes a first return passage 32E and a second return passage 32F in which the main body passage 32C is branched into two via a branch portion 32D. As described above, the first return passage 32E is connected to the housing 18 of the first air conditioner 12, and the second return passage 32F is connected to the housing 22 of the second air conditioner 14.

As a result, the air in the air-conditioned chamber 16 is introduced into the air passages 32A and 32B, the air is merged at the merging portion, and flows through the single main body passage 32C. Then, the air is diverted from the main body passage 32C to the first recirculation passage 32E and the second recirculation passage 32F through the branch portion 32D, and further the first recirculation passage 32E and the second recirculation passage 32F are respectively connected to the first air conditioner 12 and the 2 Returned to the air conditioner 14.

The low-temperature cold water circulation path 26 includes a forward-side first circulation path 26A that supplies a heat medium such as low-temperature cold water to the first coil 20 and a return-path side first circulation path 26B that recovers the heat medium discharged from the first coil 20. And are equipped with. That is, the downstream end of the outward first circulation path 26A is connected to the first coil 20, and the upstream end of the return first circulation circuit 26B is connected to the first coil 20. Further, the low-temperature cold water circulation path 26 includes a forward-side second circulation path 26C that supplies a heat medium such as low-temperature cold water to the second coil 24, and a return path that recovers the heat medium such as low-temperature cold water discharged from the second coil 24. The second side circulation path 26D is provided. That is, the downstream end of the outward second circulation passage 26C is connected to the second coil 24, and the upstream end of the return second circulation passage 26D is connected to the second coil 24.

In addition, the low temperature cold water circulation passage 26 includes one main body circulation passage 26E connected to the upstream side of the outward passage side first circulation passage 26A and the upstream side of the outward passage side second circulation passage 26C. That is, the outward path first circulation path 26A and the outward path second circulation path 26C are branched on the upstream side in the flow direction from the downstream end of the main body circulation path 26E. In addition, the first return circulation path 26B and the second outward circulation circuit 26C are connected to the upstream end of the main circulation passage 26E on the downstream side in the flow direction.

A heat source device 46 for supplying low temperature cold water and a pump 48 for circulating the low temperature cold water are provided in the main body circulation path 26E. A flow rate adjusting valve 50 for adjusting the flow rate of the low temperature cold water is provided in the outward first circulation path 26A, and a flow rate adjusting valve 52 for adjusting the flow rate of the low temperature cold water is provided in the return first side circulation path 26B. Has been. Further, a flow rate adjusting valve 54 for adjusting the flow rate of the low temperature cold water is provided in the outward second circulation path 26C, and a flow rate adjusting valve 56 for adjusting the flow rate of the low temperature cold water is provided in the return second side circulation path 26D. Is provided.

The high temperature cold water circulation passage 28 includes a forward circulation side first circulation passage 28A for supplying a heat medium such as high temperature cold water to the first coil 20. In the present embodiment, the downstream end of the outward first circulation path 28A is connected to the downstream first circulation circuit 26A downstream of the flow rate adjustment valve 50. Further, the high-temperature cold water circulation path 28 collects the outward-side second circulation path 28B for supplying the heat medium such as high-temperature cold water to the second coil 24, and the heat medium such as high-temperature cold water discharged from the second coil 24. 28C of main body circulation paths connected via the 2nd circulation path 26D of the return path. In the present embodiment, the downstream end of the outward second circulation path 28B is connected to the downstream second circulation path 26C downstream of the flow rate adjustment valve 54. The upstream end of the main body circulation passage 28C is connected to the upstream side of the flow rate adjustment valve 56 in the second return passage side circulation passage 26D.

A heat source device 60 for supplying high-temperature cold water and a pump 62 for circulating the high-temperature cold water are provided in the main body circulation path 28C. A flow rate adjusting valve 64 that adjusts the flow rate of high-temperature cold water is provided in the outward first circulation path 28A, and a flow rate adjusting valve 66 that adjusts the flow rate of high-temperature cold water is provided in the outward second circulation path 28B. Has been. Further, a flow rate adjusting valve 68 for adjusting the flow rate of the high temperature cold water is provided in the main body circulation path 28C. As the flow rate adjusting valves 50, 52, 54, 56, 64, 66, 68, for example, a two-way valve or the like is used.

The air conditioning system 10 includes a controller 70 that controls the entire air conditioning system 10. Further, an air sensor 72 that detects the state (temperature, humidity, etc.) of the air supplied from the first air conditioner 12 is provided at the upstream end of the first supply passage 30A. An air sensor 74 that detects the state (temperature, humidity, etc.) of the air supplied from the second air conditioner 14 is provided at the upstream end of the second supply passage 30B. An air sensor 76 is provided at the downstream end of the main body passage 30D to detect the state of air (temperature, humidity, etc.) before being supplied to the air-conditioned chamber 16. Further, an air sensor 78 that detects the state of the air (temperature, humidity, etc.) in the air conditioning target room 16 is provided inside the air conditioning target room 16. Although not shown, the air sensors 72, 74, 76, 78 are electrically connected to the controller 70.

A temperature sensor 80 for detecting the temperature of the cold/hot cold water is provided at the downstream end of the main body circulation path 26E of the low temperature/cool water circulation path 26. A temperature sensor 82 for detecting the temperature of the high-temperature cold water is provided at the downstream end of the main-body circulation path 28C of the high-temperature cold water circulation path 28. Although not shown, the temperature sensors 80 and 82 are electrically connected to the controller 70. The controller 70, based on the state of the air detected by the air sensors 72, 74, 76, 78, the temperature of the heat medium detected by the temperature sensors 80, 82, etc., the flow rate adjusting valves 50, 52, 54, 56, 64. , 66, 68 are controlled, the pumps 48, 62 are driven, the fans 34, 36 are driven, and the heat source devices 46, 60 are driven.

In the controller 70, a plurality of modes for adjusting the temperature and relative humidity of the air in the air-conditioned room 16 are set. In the controller 70, low temperature cold water is circulated through the first coil 20 of the first air conditioner 12 to process air with latent heat/sensible heat (that is, latent heat and sensible heat), and high temperature cold water is supplied to the second coil 24 of the second air conditioner 14. A first mode is set in which the air is circulated to sensible heat the air, and the air is merged in the supply passage 30 and supplied to the air-conditioned chamber 16. Further, in the controller 70, the second mode in which either the first air conditioner 12 or the second air conditioner 14 is stopped and the air conditioning target room 16 is air-conditioned is set. In the second mode, for example, when either the first air conditioner 12 or the second air conditioner 14 fails, either the first air conditioner 12 or the second air conditioner 14 is stopped and the other air conditioner is stopped. The air conditioning target room 16 is air-conditioned by the first air conditioner 12 or the second air conditioner 14.

Further, the controller 70 may set another mode in addition to the first mode and the second mode. For example, in the controller 70, a mode in which low-temperature cold water is circulated through both the first coil 20 and the second coil 24 to process air, or high-temperature cold water is circulated through both the first coil 20 and the second coil 24 to cause air You may set the mode etc. which process. In addition, the controller 70 sets a mode in which hot water is circulated through both the first coil 20 and the second coil 24 or one of the first coil 20 and the second coil 24 during the winter season to heat the air. May be.

Although not shown, the air conditioning system 10 may have a configuration in which the heat source device 60 and the cooling tower can be switched by the main body circulation passage 28C of the high temperature cold water circulation passage 28. With this, by switching from the heat source device 60 to the cooling tower, it is possible to exchange heat with the heat medium by the cooling tower and supply high-temperature cold water.

(Action and effect)
Next, the operation and effect of this embodiment will be described.

<First mode>
For example, a method of adjusting the temperature and the relative humidity of the air in the air-conditioned room 16 by using the air conditioning system 10 by the cooling operation in the summer will be described. As shown in FIG. 2, in the air conditioning system 10, the controller 70 causes the first coil 20 to circulate low-temperature cold water to latently and sensible heat the air, and the second coil 24 to circulate high-temperature cold water to expose the air. The first mode is set in which the heat treatment is performed, and the heat is merged in the supply passage 30 to be supplied to the air conditioning target chamber 16.

In the first mode, the controller 70 opens the flow rate adjusting valves 50 and 52 of the low temperature cold water circulation path 26 and closes the flow rate adjusting valves 54 and 56 of the low temperature cold water circulation path 26. Further, the controller 70 opens the flow rate adjusting valves 66 and 68 of the high temperature cold water circulation path 28, and closes the flow rate adjusting valve 64 of the high temperature cold water circulation path 28. Then, the controller 70 drives the pumps 48 and 62, the fans 34 and 36, and the heat source devices 46 and 60. In the first mode, the flow rates of the air recirculated to the first air conditioner 12 and the second air conditioner 14 and supplied from the first air conditioner 12 and the second air conditioner 14 are set to be substantially the same.

In the low temperature cold water circulation path 26, as shown by an arrow A, the low temperature cold water heat-exchanged by the heat source device 46 is supplied to the first coil 20 of the first air conditioner 12 through the low temperature cold water circulation path 26. At this time, the temperature of the low temperature cold water detected by the temperature sensor 80 of the low temperature cold water circulation path 26 is, for example, 7°C.

Further, in the high temperature cold water circulation path 28, as shown by an arrow B, the high temperature cold water heat-exchanged in the heat source device 60 is supplied to the second coil 24 of the second air conditioner 14 through the high temperature cold water circulation path 28. At this time, the temperature of the high temperature cold water detected by the temperature sensor 82 of the high temperature cold water circulation path 28 is, for example, 15°C.

Further, in the first air conditioner 12, the air returned from the air conditioning target chamber 16 to the first air conditioner 12 by the drive of the fan 34 exchanges heat with the low temperature cold water supplied to the first coil 20. Then, the air is supplied to the first supply passage 30A. At this time, the temperature of the air (that is, the air before being processed by the first air conditioner 12) detected by the air sensor 78 in the air-conditioned room 16 is, for example, 26° C., and the relative humidity of the air is For example, it is 50%. The temperature of the air detected by the air sensor 72 of the first supply passage 30A (that is, the air treated by the low temperature cold water of the first coil 20) is, for example, 11° C., and the relative humidity of the air is, for example, , 90%. In the first air conditioner 12, low-temperature cold water is supplied to the first coil 20, whereby moisture in the air is condensed to dehumidify the air, and the air is subjected to latent heat/sensible heat treatment.

In the second air conditioner 14, the air returned from the air conditioning target chamber 16 to the second air conditioner 14 by the drive of the fan 36 is returned to the second air conditioner 14 by the high temperature cold water supplied to the second coil 24. Then, the air is supplied to the second supply passage 30B. At this time, the temperature of the air detected by the air sensor 74 of the second supply passage 30B (that is, the air treated by the high temperature cold water of the second coil 24) is, for example, 17° C., and the relative humidity of the air is For example, 90%. In the second air conditioner 14, the high temperature cold water is supplied to the second coil 24, so that dew condensation of moisture in the air hardly occurs and the air is sensible heat treated.

Then, the air supplied to the first supply passage 30A and the air supplied to the second supply passage 30B are merged at the merging portion 30C, and the air is further supplied to the air conditioning target chamber 16 through the main body passage 30D and the like. .. As a result, the temperature and relative humidity of the air in the air-conditioned room 16 are adjusted. At this time, the temperature of the air detected by the air sensor 76 of the main body passage 30D (that is, the air after being merged at the merging portion 30C) is, for example, 14° C., and the relative humidity of the air is, for example, 90%. Is.

Further, in the air conditioning system 10, the air in the air conditioning target room 16 is recirculated to the first air conditioner 12 and the second air conditioner 14 through the recirculation passage 32, so that the first air conditioner 12 and the second air conditioner 14 and the air conditioning target room Air is circulated to and from 16.

FIG. 4 is a psychrometric chart showing a change in the state of the air during the cooling operation in the summer in the air conditioning system 10. As shown in FIG. 4, the point A1 represents the state of the air recirculated from the air-conditioned chamber 16, and the point B1 represents the state of the air after being processed by the first coil 20. In the figure, the point of reference numeral C1 represents the state of the air after being processed by the second coil 24. Further, the point D1 represents the state of the air after being merged at the merging portion 30C of the supply passage 30.

High-temperature cold water is supplied to the second coil 24, and the air is cooled by the second coil 24 in the second air conditioner 14. At this time, the air transitions from the point A1 toward the low temperature side along a predetermined absolute humidity line (for example, the absolute humidity line of 10.5) to reach the state of the point C1. That is, the air is sensible heat treated.

Low-temperature cold water is supplied to the first coil 20, and the air is cooled by the first coil 20 in the first air conditioner 12. At this time, air transitions along a predetermined absolute humidity line (for example, an absolute humidity line of 10.5) from the point A1 toward the low temperature side, and a predetermined relative humidity line (for example, 90% relative humidity). When reaching the line, dew condensation occurs on the surface of the first coil 20, and the air is subjected to latent heat/sensible heat treatment. At this time, the state of the air transits to the lower left direction along the predetermined relative humidity line, and becomes the state of point B1. Then, the air processed by the first coil 20 and the air processed by the second coil 24 are merged at the merging portion 30C of the supply passage 30 to thereby form a point D1 on a straight line connecting the points B1 and C1. It becomes the state of.

In FIG. 4, the difference in specific enthalpy of air before and after the treatment by the first coil 20 is Δ23, and the difference in specific enthalpy of air before and after the treatment by the second coil 24 is Δ9. In an example of a general refrigerator heat source, high-temperature cold water of 17° C. can be supplied with about 80% of energy as compared with low-temperature cold water of 7° C., and it is a temperature zone in which unused energy is easily introduced. As a result, the heat quantity of the following formula (1) is obtained.
Δ9×50 (capacity division)×80% (heat source COP)+Δ23×50 (capacity division)×100% (heat source COP)=360+1150=1510...Equation (1)

The heat source COP is a coefficient for checking the energy consumption efficiency of the air conditioning system, which is also called a coefficient of performance (coefficient of operation), and is a value indicating the cooling capacity/heating capacity for 1 kW of power consumption.

Here, an air conditioning system 200 of a comparative example will be described with reference to FIGS. 5 and 6.

As shown in FIG. 5, the air conditioning system 200 of the comparative example includes a first air conditioner 202, a second air conditioner 204, and an air conditioning target room 16. The first air conditioner 202 includes a first coil 206 to which low temperature cold water is supplied. The second air conditioner 204 includes a second coil 208 to which low temperature cold water is supplied.

Further, the air conditioning system 200 includes a low temperature cold water circulation path 210 that selectively circulates low temperature cold water to the first coil 206 and the second coil 208. Further, the air conditioning system 10 merges the air from the first air conditioner 202 and the air from the second air conditioner 204 to supply the air to the air conditioning target chamber 16 and the air in the air conditioning target chamber 16 to the first air conditioning system. And a recirculation passage 32 for recirculating the air to the machine 202 and the second air conditioner 204.

The low-temperature chilled water circulation path 210 includes a forward-side first circulation path 210A connected to the first air conditioner 202, a return-side first circulation path 210B connected to the first air conditioner 202, and a forward-direction second second path connected to the second air conditioner 204. A circulation path 210C and a return-side second circulation path 210D connected to the second air conditioner 204 are provided. Further, the low temperature cold water circulation path 210 includes one main body circulation path 210E connected to the upstream side of the outward path side first circulation path 210A and the upstream side of the outward path side second circulation path 210C. The first return path 210B and the second return path 210D are connected to the upstream end of the main circulation path 210E on the downstream side in the flow direction. In the low temperature cold water circulation path 210, the low temperature cold water heat-exchanged by the heat source device 46 is circulated through the first coil 206 and the second coil 208. At this time, the temperature of the low temperature cold water detected by the temperature sensor 80 of the low temperature cold water circulation path 210 is, for example, 7°C.

In the first air conditioner 202, the air returned from the air conditioning target chamber 16 to the first air conditioner 202 by the drive of the fan 34 is returned to the first air conditioner 202 by heat exchange with the low temperature cold water supplied to the first coil 206, Air is supplied to the first supply passage 30A. Similarly, in the second air conditioner 204, the air returned from the air conditioning target chamber 16 to the second air conditioner 204 by the drive of the fan 36 is returned to the second air conditioner 204 by the low temperature cold water supplied to the second coil 208. The air is exchanged and the air is supplied to the second supply passage 30B. Then, the air supplied to the first supply passage 30A and the air supplied to the second supply passage 30B are merged at the merging portion 30C, and the air is further supplied to the air conditioning target chamber 16.

At this time, the temperature of the air detected by the air sensor 78 in the air-conditioned room 16 (that is, the air before being processed by the first air conditioner 202) is, for example, 26° C., and the relative humidity of the air is For example, it is 50%. The temperature of the air detected by the air sensor 72 of the first supply passage 30A (that is, the air treated by the low temperature cold water of the first coil 206) is, for example, 13° C., and the relative humidity of the air is, for example, , 95%. The temperature of the air detected by the air sensor 74 in the second supply passage 30B (that is, the air treated by the low-temperature cold water in the second coil 208) is, for example, 13° C., and the relative humidity of the air is, for example, , 95%. Further, the temperature of the air detected by the air sensor 76 in the main body passage 30D is, for example, 13° C., and the relative humidity of the air is, for example, 95%.

FIG. 6 is a psychrometric chart showing a change in the state of the air during the cooling operation in the summer in the air conditioning system 200. As shown in FIG. 6, the point A2 represents the state of the air recirculated from the air-conditioned room 16, and the point B2 represents the state after being processed by the first coil 20 and the second coil. It represents the state of the air.

Low temperature cold water is supplied to the first coil 206 and the second coil 208, and the air is cooled by the first coil 206 and the second coil 208. At this time, the air transitions from the point A2 toward the low temperature side along a predetermined absolute humidity line (for example, an absolute humidity line of 10.5), and the air is sensible heat treated. Further, when the air reaches a predetermined relative humidity line (for example, 95% relative humidity line), dew condensation occurs on the surfaces of the first coil 206 and the second coil 208, and the air is subjected to latent heat/sensible heat treatment. At this time, the state of the air transits to the lower left direction along the predetermined relative humidity line, and becomes the state of point B2. The air conditioning system 200 cannot efficiently process sensible heat and latent heat.

In FIG. 6, the difference in specific enthalpy of air before and after the treatment by the first coil 206 and the second coil 208 is Δ18. As a result, the heat quantity of the following formula (2) is obtained.
Δ18×(50+50) (capacity division)×100% (heat source COP)=1800...Equation (2)

Comparing the heat quantity of the equation (1) and the heat quantity of the equation (2), the air conditioning system 10 of the present embodiment can save energy by about 16% at the peak time.

<Second mode>
Next, the second mode in the air conditioning system 10 will be described. In the air conditioning system 10, the controller 70 sets the second mode in which either the first air conditioner 12 or the second air conditioner 14 is stopped and the air conditioning target room 16 is air-conditioned. As shown in FIG. 3, for example, when the second air conditioner 14 fails, the controller 70 stops the second air conditioner 14 and air-conditions the air conditioning target room 16 by the other first air conditioner 12. Switch to 2 mode.

In the second mode, the controller 70 opens the flow rate adjusting valves 50 and 52 of the low temperature cold water circulation path 26 and closes the flow rate adjusting valves 54 and 56 of the low temperature cold water circulation path 26. Further, the controller 70 may close the flow rate adjusting valves 64, 66, 68 of the hot and cold water circulation passage 28. Then, the controller 70 drives the pump 48, the fan 34, and the heat source device 46.

Thereby, in the low temperature cold water circulation path 26, as shown by the arrow A, the low temperature cold water heat-exchanged by the heat source device 46 is supplied to the first coil 20 of the first air conditioner 12 through the low temperature cold water circulation path 26. .. At this time, the temperature of the low temperature cold water detected by the temperature sensor 80 of the low temperature cold water circulation path 26 is, for example, 7°C.

In the first air conditioner 12, the air returned from the air conditioning target chamber 16 to the first air conditioner 12 by the drive of the fan 34 is heat-exchanged by the low temperature cold water supplied to the first coil 20, Air is supplied to the first supply passage 30A. Then, the air supplied to the first supply passage 30A is supplied to the air conditioning target chamber 16 through the main body passage 30D and the like. Thereby, the temperature and the relative humidity of the air in the air-conditioned room 16 are adjusted.

Although illustration is omitted, in the second mode, for example, when the first air conditioner 12 fails, the first air conditioner 12 is stopped and the other second air conditioner 14 air-conditions the air conditioning target chamber 16. May be.

In the above-described air conditioning system 10, in the first mode, low temperature cold water is circulated in the first coil 20 in the first air conditioner 12 to latently heat and sensible heat the air, and in the second air conditioner 14 to the second coil 24. The hot and cold water is circulated to sensible heat the air, and the air is merged in the supply passage 30 and supplied to the air-conditioned room 16. Therefore, the load on the fans 34 and 36 is small, and the latent heat/sensible heat and the sensible heat can be separated and processed with a simple configuration. Therefore, the air conditioning system 10 can save energy as compared with the case where the latent heat/sensible heat and the sensible heat are not separately processed.

Further, in the air conditioning system 10, in the second mode, either the first air conditioner 12 or the second air conditioner 14 is stopped to air-condition the air conditioning target room 16. Therefore, for example, when one of the first air conditioner 12 and the second air conditioner 14 fails, only the other of the first air conditioner 12 and the second air conditioner 14 is operated to air-condition the air-conditioning target chamber 16. By doing so, it can function as a backup in case of a failure.

[Supplementary explanation]
In the above embodiment, the temperature of the low-temperature cold water supplied to the first coil 20, the temperature of the high-temperature cold water supplied to the second coil 24, the temperature and the relative humidity of the air in the air-conditioning target chamber 16, and the processing by the first coil 20. The temperature and relative humidity of the air after being treated and the temperature and relative humidity of the air after being treated by the second coil 24 can be changed.

In the above embodiment, the air-conditioned room 16 is one room, but it may be a plurality of rooms. That is, the first air conditioner 12 and the second air conditioner 14 may be configured to adjust the temperature and relative humidity of air in a plurality of rooms (rooms to be air-conditioned).

Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments and various other embodiments are possible within the scope of the present invention. Obvious to the trader.

10 Air Conditioning System 12 First Air Conditioner 14 Second Air Conditioner 16 Air Conditioning Target Room 20 First Coil 24 Second Coil 26 Low Temperature Cold Water Circulation Channel 28 High Temperature Cold Water Circulation Channel 30 Supply Channel 32 Reflux Channel

Claims (2)

A first air conditioner having a first coil;
A second air conditioner having a second coil;
A low temperature cold water circulation path for selectively circulating low temperature cold water to the first coil and the second coil;
A hot and cold water circulation path for selectively circulating hot and cold water to the first coil and the second coil;
A supply passage that joins the air that has undergone heat exchange with the first coil and the second coil, or that supplies one of the air to the air-conditioned room;
A return passage for returning the air in the air-conditioned room to the first air conditioner and the second air conditioner;
Equipped with
Low-temperature cold water is circulated in the first coil to carry out latent heat and sensible heat treatment of air, and high-temperature cold water is circulated in the second coil to sensible heat treatment of air, which is merged in the supply passage and supplied to the air-conditioned chamber An air conditioning system having a first mode. The air conditioning system according to claim 1, further comprising a second mode in which one of the first air conditioner and the second air conditioner is stopped to air-condition the air conditioning target room.