JP2019120464A - Air conditioning system - Google Patents

Abstract

To provide an air conditioning system capable of saving energy by reducing total flow rate of a heat medium to be supplied to an outside conditioner and an indoor unit from a heat source.SOLUTION: An air conditioning system includes: an outside conditioner 10; an indoor unit 20; and a circulation supply passage 40 which circulates and supplies a heat medium R in a parallel state with the outside conditioner 10 and the indoor unit 20 from a heat source 30. The outside conditioner 10 has a cooling section 11 for cooling outside air and is configured to pass the heat medium R supplied from the heat source 30 through the cooling section 11 and return the heat medium to the heat source 30. The air conditioning system further includes a heat medium joining section 60 which joins a part of the heat medium R returned from the outside conditioner 10 to the heat source 30 to the heat medium R directly supplied from the heat source 30 to the indoor unit 20 and supplies the heat medium to the indoor unit 20.SELECTED DRAWING: Figure 1

Description

  According to the present invention, an external air conditioner that regulates outside air and supplies it indoors, an indoor unit that regulates indoor air and supplies it indoors, and a heat source in parallel with a heat source from the heat source to the external air conditioner and the indoor unit The present invention relates to an air conditioning system provided with a circulation supply path for circulation supply.

  In this type of air conditioning system, as shown in Patent Document 1, cold water (heat medium) from a heat source (refrigerator 50) to an external air conditioner (cooling coil 3) and an indoor unit (dry coil 30) in summer, etc. Are circulated in parallel, the outside air is cooled and dehumidified by the external air conditioner (cooling coil 3), and low-humidity air supply is supplied to the room (M) to process mainly the latent heat of the room (M). It is carried out to supply the supply air which cooled indoor air with the machine (dry coil 30) indoors (M), and to process indoor (M) sensible heat (FIG. 3, paragraph 0030 of patent document 1). Etc.).

JP, 2005-207712, A

  In the air conditioning system described in Patent Document 1, when circulating cold water in parallel from the heat source to the external air conditioner and the indoor unit, all the cold water used in the external air conditioner is directly supplied from the heat source to the external air conditioner Since all the cold water used in the indoor unit is directly supplied from the heat source to the indoor unit, the total flow rate of the cold water supplied from the heat source to the external air conditioner and the indoor unit becomes relatively large. Moreover, there may be a plurality of indoor units, in which case the total flow rate of cold water will increase as the number of indoor units increases. Therefore, it is desired to reduce energy consumption by reducing the total flow rate of the heat medium supplied from the heat source to the external air conditioner and the indoor unit.

  In view of this situation, the main problem of the present invention is to provide an air conditioning system capable of saving energy by reducing the total flow rate of the heat medium supplied from the heat source to the external air conditioner and the indoor unit.

According to a first aspect of the present invention, there is provided an external air conditioner that regulates outside air and supplies the air indoors;
An indoor unit that regulates indoor air and supplies it indoors;
A circulation supply path for circulating and supplying a heat medium in parallel from the heat source to the outdoor unit and the indoor unit;
The external cooler has a cooling unit that cools the outside air, and is configured to pass a heat medium supplied from the heat source through the circulation supply passage to the cooling unit and return it to the heat source.
A point is provided that a heat medium merging portion is provided which causes a part of the heat medium to be returned from the external air conditioner to the heat source to be merged with the heat medium directly supplied from the heat source to the indoor unit and supplied to the indoor unit It is in.

According to this configuration, when circulating and supplying the heat medium from the heat source to the external air conditioner and the indoor unit in parallel, the heat medium supplied to the external air conditioner and returned from the external air conditioner to the heat source is Since the heat medium is supplied directly to the indoor unit from the heat source and supplied to the indoor unit, the flow rate of the heat medium supplied directly from the heat source to the indoor unit can be reduced by the amount of the merge. Energy saving can be achieved by reducing the total flow rate of the heat medium supplied to the machine and the indoor unit.
Here, the outside air is cooled to the dew point temperature or lower to dehumidify, whereas the indoor unit only needs to cool the indoor air to the target temperature of the room, so the optimum cooling water to the indoor unit is used. The supply temperature (heat medium inlet temperature) is higher than the supply temperature of cold water to the external air conditioner. Therefore, when the supply temperature of cold water to the external air conditioner is set to the external air conditioner target temperature (temperature for cooling and dehumidifying the outside air) by the heat source, part of the heat medium returned from the external air conditioner to the heat source is Even if the heat medium is supplied from the heat source directly to the indoor unit, the supply temperature of the heat medium to the indoor unit can be maintained at a temperature capable of cooling the indoor air to the target temperature in the room. Therefore, while the cooling dehumidification of the outside air in the outside air conditioner can be appropriately performed, the air conditioning of the room air in the indoor unit can also be appropriately performed.
In addition, when a part of the heat medium returned from the external cooler to the heat source is joined to the heat medium directly supplied from the heat source to the indoor unit, the temperature of the heat medium supplied to the indoor unit is changed. Therefore, the temperature of the heat medium supplied to the indoor unit can be changed according to the conditions of the indoor unit and the indoor air, and the indoor air can be suitably conditioned by the indoor unit.

According to a second aspect of the present invention, the external air conditioner has a reheating unit that reheats the outside air cooled by the cooling unit, and a heat medium supplied from the heat source is allowed to pass through the cooling unit. It is configured to be able to pass through the reheating section later and return to the heat source,
The heat medium merging unit merges the heat medium that has passed through both the cooling unit and the reheating unit of the external air conditioner with the heat medium that is directly supplied from the heat source to the indoor unit, and the indoor unit In that it is configured to supply

  According to this configuration, the temperature of the heat medium, which has been increased through the cooling unit of the external cooler, is reduced by passing through the reheating unit of the external cooler, and the temperature is somewhat returned to the indoor unit. Can be combined with the heat medium directly supplied to the Therefore, when adjusting the supply temperature of the heat medium to the indoor unit to the target temperature for indoor unit (temperature higher than the target temperature for the external air conditioner), the heat medium is merged by the amount of temperature reduction in the reheating unit. Flow rate can be increased. Therefore, the flow rate of the heat medium directly supplied from the heat source to the indoor unit can be further reduced, and the total flow rate of the heat medium supplied from the heat source to the external air conditioner and the indoor unit can be further reduced.

  According to a third aspect of the present invention, there is provided a merging amount adjusting unit capable of adjusting the flow rate of the heating medium to be merged at the heating medium merging portion.

  According to this configuration, it is possible to make it possible to change the temperature of the heat medium inlet in the indoor unit in a simple form in which the heat medium flow rate to be merged at the heat medium merging section is adjusted by the merging amount adjustment section.

  According to a fourth aspect of the present invention, there is provided an indoor unit inlet temperature detection unit for detecting a heat medium inlet temperature in the indoor unit, and a control for controlling the merging amount adjustment unit based on detection results of the indoor unit inlet temperature detection unit. The point is that the department is equipped.

  According to this configuration, the control unit controls the merging amount adjustment unit based on the detection result of the indoor unit inlet temperature detection unit, and the heat medium flow rate to be merged in the cold water merging unit can be automatically adjusted. For example, the heat medium inlet temperature in the indoor unit can be maintained at a desired temperature such as the target temperature for the indoor unit.

The figure which shows the driving | running state of 1st Embodiment of an air conditioning system Diagram showing the operating state of the second embodiment of the air conditioning system Diagram showing another operating state of the second embodiment of the air conditioning system

  An embodiment of the air conditioning system of the present invention will be described based on the drawings. In each of the drawings, the flow path through which the heat medium does not flow is represented by a thin solid line, and the flow path through which the heat medium flows is represented by a thick solid line. In addition, the valve in the fully closed state is shown in black, and the valve in the other open state is shown in white. Furthermore, the non-operating pump is shown in black and the operating pump is shown in white.

First Embodiment
FIG. 1 shows the operating state of the first embodiment of the air conditioning system according to the present invention. As shown in FIG. 1, the air conditioning system adjusts the outside air OA and supplies the air as the supply air SA1 to the room, and the indoor unit supplies the room air RA to the room as the supply air SA2. 20, a heat source 30 having a refrigerator or the like, a circulation supply path 40 for circulating and supplying cold water (an example of a heat medium) in parallel from the heat source 30 to the external air conditioner 10 and the indoor unit 20; The control unit 50 is configured to control an operation state. Although one indoor unit 20 is shown in the figure, it may be plural.
The air conditioning system mainly treats the latent heat load in the room by cooling and dehumidifying the outside air OA with the external air conditioner 10 and supplying low-humidity air supply SA1 to the room, and cooling the room air RA with the indoor unit 20 The air supply SA2 is supplied into the room to process the indoor sensible heat load.

The external air conditioner 10 includes a cooling unit 11 capable of cooling and dehumidifying the outside air OA, a reheating unit 12 capable of reheating the outside air OA cooled by the cooling unit 11, and a reheating unit 12 It has a fan 13 for air supply that sends out the outside air OA as the air supply SA1, etc., and the outside air OA is cooled and dehumidified by the cooling unit 11 and reheated by the reheating unit 12 as appropriate. It is configured to be able to be supplied indoors.
The cooling unit 11 is configured of a cooling coil capable of cooling the outside air OA to the dew point temperature or less by heat exchange between the outside air OA and the cold water. The reheating unit 12 is configured by a reheating coil capable of reheating the outside air OA by heat exchange between the outside air OA cooled by the cooling unit 11 and cold water having a higher temperature than that.

The indoor unit 20 includes a cooling unit 21 capable of adjusting the temperature by cooling the indoor air RA, and an air supply fan 22 for sending out the indoor air RA cooled by the cooling unit 21 as the air supply SA2. After the room air RA is cooled by the cooling unit 21, the room air RA can be supplied into the room as the air supply SA2.
The cooling unit 21 is configured of a cooling coil capable of cooling the room air RA by heat exchange between the room air RA and the cold water.

  The heat source 30 is composed of, for example, a turbo refrigerator capable of adjusting its capacity by inverter control or the like and an absorption refrigerator etc. and a pump whose capacity can be adjusted, etc. Cold water is generated, and the cold water is circulated in the circulation supply passage 40 at the discharge pressure of the pump. The control unit 50 is, for example, a computer including a communication unit and a calculation unit, and controls the operation state of each unit of the air conditioning system by communication with each unit of the air conditioning system.

  The circulation supply path 40 merges the outgoing water 41 capable of parallelly supplying cold water from the heat source 30 to the external air conditioner 10 and the indoor unit 20, the cold water passing through the external air conditioner 10 and the cold water passing through the indoor air 20 It has the return path 42 etc. which are returned to the heat source 30.

  The outward path 41 is a main outward path 41A from the heat source 30 to the branch point to the external air conditioner 10, an external air conditioner side outward path 41B from the branch point to the heat medium inlet of the cooling portion 11 of the external air machine 10, The indoor unit side outward passage 41 C and the like from the branch point to the heat medium inlet of the cooling unit 11 of the indoor unit 20 are configured. In this embodiment, the pressure loss at the time of passing the cold water through the reheating unit 12 is performed in the operation state in which the reheating unit 12 of the outside conditioner 10 causes the cold water to pass through An adjustable pump P1 is provided.

  The return path 42 is an outside air conditioner side return path 42B from the outside air conditioner 10 side to the junction, an indoor unit side return road 42C from the heat medium outlet of the cooling unit 21 of the indoor unit 20 to the junction It is comprised from the main return path part 42A etc. from a location to the heat source 30. As shown in FIG.

  As shown in FIG. 1, the external air conditioner 10 is configured to pass cold water supplied from the heat source 30 through the circulation supply passage 40 to the cooling unit 11 and return it to the heat source 30. When reheating by the reheating unit 12 is necessary, the external cooler 10 passes cold water supplied from the heat source 30 through the circulation supply passage 40 to the cooling unit 11 and then passes it also to the reheating unit 12. If it is possible to return to the heat source 30 and if reheating by the reheating unit 12 is unnecessary, the cold water supplied from the heat source 30 through the circulation supply passage 40 is allowed to pass through only the cooling unit 11. It is configured to be possible to return to.

  On the side of the external air conditioner 10, a connection path 14 is provided which connects the heat medium outlet of the cooling unit 11 and the upstream end of the external air conditioner side return path 42B via the reheating unit 12. The connection path 14 is a first connection path 14A connecting the heat medium outlet of the cooling unit 11 and the heat medium inlet of the reheating unit 12, the heat medium outlet of the reheating unit 12, and the external air conditioner side return path. A second connection path 14B is provided to connect the upstream end of the portion 42B. Therefore, the external air conditioner 10 is supplied with the cold water supplied from the heat source 30 by sequentially passing through the main forward passage 41A and the external air conditioner side outward passage 41B, the cooling unit 11, the first connection passage 14A, the reheating unit 12, the The second connection passage 14B, the external air conditioner side return passage 42B, and the main return passage 42A can be sequentially passed through and returned to the heat source 30.

  Further, on the side of the air conditioner 10, there is provided a bypass passage 15 which branches from the upstream side of the first connection passage 14A, bypasses the reheating unit 12 and joins the downstream side of the second connection passage 14B. Therefore, the external air conditioner 10 supplies the cold water supplied from the heat source 30 by sequentially passing through the main forward passage 41A and the external air conditioner side outward passage 41B, the cooling unit 11, the upstream side of the first connection passage 14A, the bypass passage 15 The downstream side of the second connection path 14B, the external conditioner side return path portion 42B, and the main return path portion 42A can be sequentially passed through and returned to the heat source 30.

  The air conditioning system is provided with a first reheating amount adjustment unit 16A that adjusts the reheating amount in the reheating unit 12 by adjusting the flow rate of cold water supplied to the reheating unit 12, and the control unit 50 By controlling the first reheat amount adjustment unit 16A according to the detection result of the detected temperature and the like of the air supply SA1 acquired from the external air conditioner 10 and the like, the temperature of the air supply SA1 supplied from the external air conditioner 10 is targeted It can be adjusted to the air temperature.

  For example, the first reheat amount adjustment unit 16A is configured of a first flow control valve V1 provided in the connection passage 14 and a second flow control valve V2 provided in the bypass passage 15, and the reheating unit 12A. By changing the distribution ratio of the cold water between the connection passage 14 passing through and the bypass passage 15 bypassing the reheating unit 12, and adjusting the flow rate of the cold water supplied to the reheating unit 12; Adjust the reheating amount at 12.

  The control unit 50 monitors the detected temperature of the air supply SA1 acquired from the external air conditioner 10 or the like, and, according to the detected temperature of the air supply SA1, the first detected temperature becomes the target air supply temperature. A mode in which the distribution ratio described above is changed by controlling the opening degree of the flow control valve V1 in the range of 100 to 0% and controlling the opening degree of the second flow control valve V2 in the range of 0 to 100%. Then, the flow rate of the cold water supplied to the reheating unit 12 is adjusted to adjust the reheating amount in the reheating unit 12.

  For example, when the detected temperature of the air supply SA1 is lower than the target air supply temperature, the control unit 50 controls the first flow control valve V1 to the open side, and controls the second flow control valve V2 to the close side. The flow rate of cold water supplied to the reheating unit 12 is increased to increase the reheating amount in the reheating unit 12. Conversely, when the detected temperature of the air supply SA1 is higher than the target air supply temperature, the control unit 50 controls the first flow control valve V1 to the closing side, and controls the second flow control valve V2 to the opening side. Then, the flow rate of cold water supplied to the reheating unit 12 is reduced to reduce the reheating amount in the reheating unit 12.

  And in this air conditioning system, a part of the cold water (the cold water heated from the outside air conditioner 10 by utilizing cold energy and heated up) returned from the air conditioner 10 to the heat source 30 directly from the heat source 30 to the indoor unit 20 It is cold water to be supplied, is joined to cold water of the target temperature for external air conditioning (temperature for cooling and dehumidifying the outside air OA) flowing through the main forward passage portion 41A and the indoor unit side forward passage portion 41C, and is supplied to the indoor unit 20. A heat medium merging portion 60 is provided.

Therefore, in this air conditioning system, the total flow rate of the cold water supplied from the heat source 30 to the external air conditioner 10 and the indoor unit 20 is reduced by the amount of merging by the heat medium merging portion 60. Moreover, the supply temperature of the cold water to the indoor unit 20 is raised while maintaining the supply temperature of the cold water to the external air conditioner 10 at the target temperature for the external air conditioner by the heat source 30 and is higher than the target temperature for the external air conditioner The target temperature for the indoor unit (the temperature for cooling to the target temperature in the room without dehumidifying the indoor air) is changed.
Incidentally, the remainder of the cold water returned from the external air conditioner 10 to the heat source 30 passes through the external air conditioner side return path portion 42B and the main return path portion 42A in order and is returned to the heat source 30.
Hereinafter, the heat medium merging portion 60 and the related configuration will be described.

  The heat medium merging unit 60 is only the cold water passing through both the cooling unit 11 and the reheating unit 12 of the external air conditioner 10 as the cold water to be returned to the heat source 30 from the external air conditioner 10 or only the cooling unit 11 of the external air conditioner 10 The cold water that has passed through is joined to the cold water supplied directly from the heat source 30 to the indoor unit 20 and can be supplied to the indoor unit 20.

  Here, when both the cooling unit 11 and the reheating unit 12 of the external air conditioner 10 are allowed to pass through, the cold water passes through the cooling unit 11 and rises in temperature, and then passes through the reheating region 12 of the external air conditioner 10 Since the temperature is lowered and the temperature is returned somewhat, it is possible to use cold water whose temperature is lower than that of the cold water which has passed only the cooling unit 11 of the external air conditioner 10. Therefore, in the heat medium merging section 60, the cold water which has passed through both the cooling section 11 and the reheating section 12 of the external air conditioner 10 is merged with the cold water directly supplied from the heat source 30 to the indoor unit 20. In the case where the temperature is supplied to 20, the amount of combined cold water required for adjusting the supply temperature of the cold water to the indoor unit 20 to the target temperature for the indoor unit (a temperature higher than the target temperature for the external air conditioner) The temperature can be increased by the amount of temperature reduction, and the total flow rate of cold water supplied from the heat source 30 to the external air conditioner 10 and the indoor unit 20 can be further reduced.

  The heat medium merging portion 60 is configured by a first combined channel 61 which branches from the external conditioner side return path portion 42B (upstream end in the illustrated example) in the return path 42 and merges with the indoor unit side outward path portion 41C in the outbound path 41 It is done. Therefore, the first combined channel 61 includes the cooling unit 11, the first connection passage 14A, the reheating unit 12, the cold water passing through the second connection passage 14B, the cooling unit 11, the upstream side of the first connection passage 14A, the bypass passage 15. The cold water having passed through the downstream side of the second connection path 14B can be merged with the cold water flowing through the indoor unit side forward path 41C.

  Furthermore, in the air conditioning system, a merging amount adjusting unit 62 capable of adjusting the flow rate of cold water to be merged in the heat medium merging unit 60 is provided. The merging amount adjusting unit 62 is configured of a third flow control valve V3 as a flow control unit provided in the first combined channel 61. The third flow control valve V3 changes the flow area of the first combined flow passage 61 to change the flow rate of the cold water flowing through the first combined flow passage 61, whereby the cold water to be merged into the indoor unit side outward passage 41C The flow rate can be adjusted.

In addition, an indoor unit inlet temperature sensor S1 (an example of an indoor unit inlet temperature detection unit) for detecting a heat medium inlet temperature in the indoor unit 20 is provided, and the control unit 50 detects the detection result of the indoor unit inlet temperature sensor S1. Based on the control, the merging amount adjusting unit 62 is controlled to adjust the flow rate of cold water to be merged in the heat medium merging unit 60.
In the present embodiment, the control unit 50 sets the third flow control valve V3 so that the detected temperature as the detection result of the indoor unit inlet temperature sensor S1 becomes the target temperature for the indoor unit higher than the target temperature for the external air conditioner. By controlling the opening degree, the flow rate of the cold water to be merged with the indoor unit side outward path portion 41C in the first combined channel 61 is adjusted.

For example, as the detected temperature of the indoor unit inlet temperature sensor S1 is lower than the indoor unit target temperature, the control unit 50 increases the flow rate of cold water to be joined to the indoor unit side outward passage 41C, and the detected temperature of the indoor unit inlet temperature sensor S1. By controlling the opening degree of the third flow control valve V3 so as to reduce the flow rate of the cold water to be joined to the indoor unit side outward passage 41C as the indoor unit target temperature is higher than the indoor unit target temperature, the indoor unit in the first combined passage 61 It is possible to adjust the flow rate of the cold water to be merged into the side outward passage 41C, and appropriately adjust the temperature of the cold water supplied to the indoor unit 20 to the target temperature for the indoor unit.
As described above, in this air conditioning system, the flow rate of the cold water to be joined to the indoor unit side outward path portion 41C in the first merging channel 61 is automatically adjusted based on the detection result of the indoor unit inlet temperature sensor S1. The heat transfer medium inlet temperature at can be properly maintained at the indoor unit target temperature.

Second Embodiment
2 and 3 show different operating states of the second embodiment of the air conditioning system according to the present invention. In the second embodiment, a part of the cold water returned from the indoor unit 20 to the heat source 30 can be mainly supplied to the reheating unit 12 of the external air conditioner 10 as shown in FIG. A second combined channel 43 is added.

  Therefore, this air conditioning system is not limited to the first reheating supply form (see FIG. 2) for supplying the cold water having passed through the cooling unit 11 of the external air conditioner 10 to the reheating unit 12 of the external air conditioner 10 Even in the second reheating supply form (see FIG. 3) in which part of the cold water returned from the heat source 20 to the heat source 30 is supplied to the reheating part 12 of the external air conditioner 10 through the second combined flow path 43 Can be supplied.

  In cases such as when the outside air temperature is too low, the temperature rise of the cold water that has passed through the cooling unit 11 of the external air conditioner 10 is insufficient and the reheating in the reheating unit 12 can not be performed properly. By switching from the first reheating supply mode shown in FIG. 2 to the second reheating supply mode shown in FIG. 3, the external air conditioner 10 can control part of the highest temperature cold water returned from the indoor unit 20 to the heat source 30. The reheater 12 of the external conditioner 10 can appropriately supply heat to the reheater 12 of the external heater 10 to appropriately perform reheat.

  The second combined flow path 43 is configured as a flow path that branches from the indoor unit side return path portion 42C of the circulation supply path 40 and joins the downstream side of the first connection path 14A on the external air conditioner 10 side. The second combined flow path 43 is provided with a pump P2 for extracting the cold water from the indoor unit side return path portion 42C in the second reheating supply form. The second combined flow path 43 takes out the cold water from the indoor unit side return path portion 42C of the circulation supply path 40 by the operation of the pump P2, and the extracted cold water is downstream of the first connection path 14A on the external air conditioner 10 side. It can be supplied to the side and supplied to the reheating unit 12 of the external air conditioner 10.

  The control unit 50 monitors the detected temperature of the air supply SA1 acquired from the external air conditioner 10 or the like, and supplies cold water to the reheating unit 12 in the first reheating supply form shown in FIG. 2. If the detected temperature of the air supply SA1 falls below the lower limit temperature, it is determined that the temperature of the cold water is too low in the first reheating supply mode, and the mode is switched to the second reheating supply mode shown in FIG. Specifically, the control unit 50 changes the first flow control valve V1 to the closed state from the first reheating supply mode shown in FIG. 2, and the reheating unit 12 in the first reheat supply mode. The pump P1 for compensating for the pressure loss is changed to the stop state, and the pump P2 is changed to the operating state, thereby switching to the second reheating supply mode shown in FIG.

  In this second reheating supply mode, as shown in FIG. 3, the cold water from the heat source 30 is taken as the main forward passage 41A, the external air conditioner side outward passage 41B, the cooling unit 11, and the upstream side of the first connection passage 14A, The bypass passage 15, the downstream side of the second connection passage 14B, the first combined passage 61, the indoor unit side forward passage 41C, the cooling unit 21 of the indoor unit 20, and the indoor unit side return passage 42C are sequentially passed back to the heat source 30 Part of the cold water (the cold water with the highest temperature in the circulation supply passage 40) returned to the heat source 30 at the indoor unit side return passage 42C while the downstream side of the second combined passage 43 and the first connection passage 14A is in order It can flow and be supplied to the reheating part 12 of the external air conditioner 10.

Further, in the second connection passage 14B through which the cold water having passed through the reheating unit 12 flows, the flow rate of the cold water supplied to the reheating unit 12 in the second reheating supply form is adjusted by the reheating unit 12 The second reheat adjustment unit 16B is provided to adjust the reheat of the In the second reheating supply mode, the control unit 50 controls the second reheat amount adjustment unit 16B according to the detection result of the detected temperature of the air supply SA1 acquired from the external air conditioner 10 or the like, thereby controlling the external adjustment. The temperature of the air supply SA1 supplied from the machine 10 can be adjusted to the target air supply temperature.
The second reheating amount adjustment unit 16B is configured of, for example, a fourth flow control valve V4 as a flow rate control unit provided in the second connection path 14B, and the second connection path in the second reheating supply form By adjusting the flow rate of cold water flowing through 14 B and adjusting the flow rate of cold water supplied to the reheating unit 12, the reheat amount in the reheating unit 12 is adjusted.

  For example, when the detected temperature of the air supply SA1 is lower than the target air supply temperature, the control unit 50 controls the fourth flow control valve V4 to the open side to increase the flow rate of cold water supplied to the reheating unit 12 Then, the reheating amount in the reheating unit 12 is increased. Conversely, when the detected temperature of the air supply SA1 is higher than the target air supply temperature, the control unit 50 controls the fourth flow control valve V4 to the closing side, and the flow rate of cold water supplied to the reheating unit 12 The amount is reduced to reduce the amount of reheating at the reheating unit 12.

[Another embodiment]
Another embodiment of the present invention will be described. In addition, the configuration of each embodiment described below is not limited to being individually applied, and may be applied in combination with the configuration of the other embodiments.

(1) In the above embodiment, although the case where the merging amount adjustment unit 62 is configured by the third flow control valve V3 as the flow control means provided in the first combined flow passage 61 is shown as an example, Instead of being provided at the branch point between the external air conditioner side return air passage portion 42B (the upstream end in the illustrated example) and the first combined flow passage 61, between the external air conditioner side return air passage portion 42B and the first integrated flow passage 61 The distribution ratio of the cold water in the above can be changed by a three-way control valve or the like that can be changed, and various configuration changes are possible.

(2) In the above embodiment, although the case where the second reheat amount adjustment unit 16B is configured by the fourth flow control valve V4 as the flow control means provided in the second connection path 14B is shown as an example, Instead of this, the pump P2 provided in the second combined flow path 43 is capable of capacity adjustment, and the capacity adjustment of the pump P2 adjusts the flow rate of the cold water supplied to the reheating part 12 to adjust the reheating part 12 Can be configured to adjust the amount of reheating at the time of day, and various configuration changes are possible. Similarly, various configuration changes can be made to the first reheating amount adjustment unit 16A.

DESCRIPTION OF REFERENCE NUMERALS 10 outside air conditioner 11 cooling unit 12 reheating unit 20 indoor unit 21 cooling unit 30 heat source 40 circulation supply path 50 control unit 60 heat medium merging unit 62 combined flow adjustment unit OA outside air RA room air

Claims (4)

An external air conditioner that regulates the outside air and supplies it indoors,
An indoor unit that regulates indoor air and supplies it indoors;
A circulation supply path for circulating and supplying a heat medium in parallel from the heat source to the outdoor unit and the indoor unit;
The external cooler has a cooling unit that cools the outside air, and is configured to pass a heat medium supplied from the heat source through the circulation supply passage to the cooling unit and return it to the heat source.
An air conditioner comprising a heat medium merging portion for merging a part of a heat medium returned from the external air conditioner to the heat source with a heat medium directly supplied from the heat source to the indoor unit and supplied to the indoor unit system. The external cooler has a reheating unit that reheats the outside air cooled by the cooling unit, and after passing a heat medium supplied from the heat source to the cooling unit, the heat medium is also passed through the reheating unit. To be able to return to the heat source,
The heat medium merging unit merges the heat medium that has passed through both the cooling unit and the reheating unit of the external air conditioner with the heat medium that is directly supplied from the heat source to the indoor unit, and the indoor unit The air conditioning system according to claim 1, wherein the air conditioning system is configured to supply the air.   The air conditioning system according to claim 1 or 2, further comprising a merging amount adjustment unit capable of adjusting a flow rate of the heating medium to be merged at the heating medium merging portion.   The indoor unit inlet temperature detection unit that detects a heat medium inlet temperature in the indoor unit, and a control unit that controls the merging amount adjustment unit based on the detection result of the indoor unit inlet temperature detection unit. Air conditioning system as described in.

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