Air conditioning system

Abstract

To prevent dew condensation generated in a box body that stores a heat exchanger provided in an air conditioning system.SOLUTION: When a first heat medium is cooled by a first heat source 10 and supplied to an air conditioner 3 during cooling operation, an air conditioning system operates a valve device 44 so that the first heat medium having passed through the first heat source 10 does not flow into a heat exchanger 31 but flows through a bypass circuit 41e, and operates a circulation pump 53, to circulate a second heat medium between a second heat source 20 and the heat exchanger 31.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an air conditioning system, and more particularly to preventing condensation on a box that houses a heat exchanger of an air conditioning system. [Background technology]

[0002] Conventionally, there is an air conditioning system that includes a heat pump type heat source, a combustion type heat source, an air conditioner that heats and cools an indoor space, a refrigerant circuit that circulates a refrigerant between the heat pump type heat source and a first heat exchanger, a heat medium circuit that circulates a heat medium between the combustion type heat source and a second heat exchanger, and a circulation path that circulates a circulating liquid between the first and second heat exchangers and the air conditioner (for example, Patent Document 1). In this air conditioner, the refrigerant is circulated between the heat pump type heat source and the first heat exchanger, and the circulating liquid flowing through the circulation path is cooled by the first heat exchanger, thereby cooling the indoor space. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-159663 Summary of the Invention [Problem to be solved by the invention]

[0004] In an air conditioning system configured by connecting multiple devices, such as heat sources and air conditioners, a heat exchanger unit containing a heat exchanger in a housing may be installed in the underfloor space. When a first heat exchanger and a second heat exchanger are connected by a circulation path as in Patent Document 1, cooled circulating fluid also flows into the second heat exchanger during cooling, causing a drop in the internal temperature of the housing of the heat exchanger unit containing the second heat exchanger. As a result, when the outside temperature is high in summer and the outer surface of the housing falls below the dew point, condensation occurs, causing a problem of mold growth in the underfloor space.

[0005] The present invention is intended to solve the above-mentioned problems, and an object of the present invention is to prevent condensation from occurring on a box that houses a heat exchanger of an air conditioning system. [Means for solving the problem]

[0006] According to the present invention, a first heat source capable of heating and cooling a first heat medium; a second heat source capable of heating a second heat medium; an air conditioner capable of selectively heating and cooling the indoor space by exchanging heat between a first heat medium and the indoor space; a first heat medium circuit that circulates a first heat medium between the first heat source and the air conditioning device; a heat exchanger connected to a position downstream of the first heat source and upstream of the air conditioner in the first heat medium circuit; a second heat medium circuit that circulates a second heat medium between the second heat source and the heat exchanger; a circulation pump that circulates the second heat medium between the second heat source and the heat exchanger; a bypass circuit that connects the first heat medium circuit upstream and downstream of the heat exchanger and bypasses the heat exchanger; a valve device that blocks the first heat medium circuit in the heat exchanger on at least one of the upstream side and the downstream side of the heat exchanger so that the first heat medium after circulating through the first heat source does not flow into the heat exchanger but flows into the bypass circuit; a box that accommodates at least a portion of the heat exchanger and at least a portion of the bypass circuit; a control device; When the first heat medium is cooled by the first heat source and supplied to the air conditioning device, the control device operates the valve device so that the first heat medium that has circulated through the first heat source does not flow into the heat exchanger but instead flows through a bypass circuit, and also operates the circulation pump to circulate the second heat medium between the second heat source and the heat exchanger, thereby providing an air conditioning system.

[0007] According to the above air conditioning system, when the first heat medium is cooled by the first heat source and supplied to the air conditioner, the valve device is operated so that the first heat medium that has circulated through the first heat source circulates through the bypass circuit without flowing into the heat exchanger, and the circulation pump is operated to circulate the second heat medium between the second heat source and the heat exchanger, so that a decrease in the internal temperature inside the box that houses at least a portion of the heat exchanger and the bypass circuit can be suppressed even during cooling operation, thereby preventing condensation on the outer surface of the box in summer.

[0008] Preferably, the air conditioning system further comprises: a box internal temperature detection means for detecting an internal temperature of the box; When the internal temperature of the box falls to or below a predetermined temperature, the control device activates the circulation pump to circulate the second heat medium between the second heat source and the heat exchanger.

[0009] According to the air conditioning system, the circulation pump is operated when the internal temperature of the box falls below a predetermined temperature, so that condensation can be effectively prevented.

[0010] Preferably, in the air conditioning system, The control device operates the circulation pump to circulate the second heat medium that is not heated by the second heat source between the second heat source and the heat exchanger.

[0011] According to the air conditioning system, the second heat medium that is not heated by the second heat source is circulated, so that condensation can be prevented with low energy. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic configuration diagram showing an example of an air conditioning system according to an embodiment of the present invention. [Figure 2] FIG. 2 is a block diagram showing an example of an air conditioning system according to an embodiment of the present invention. [Figure 3] FIG. 3 is an explanatory diagram of the operation of the air conditioning system according to the embodiment of the present invention. [Figure 4]FIG. 4 is an explanatory diagram of the operation of the air conditioning system according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] An air conditioning system according to an embodiment of the present invention will be described below. 1, an air conditioning system 1 of this embodiment includes a cooling and heating air conditioner 3 as an air conditioner, a heat pump unit 10 as a first heat source capable of heating and cooling a first heat medium, and a combustion heat source machine 20 as a second heat source capable of heating a second heat medium. The first and second heat mediums in this air conditioning system 1 may be, for example, water or antifreeze.

[0014] The cooling and heating air conditioner 3 has a flow path (not shown) through which a first heat medium flows, and is a known air conditioner that heats or cools an indoor space by exchanging heat between the first heat medium flowing through the flow path and the indoor space in which it is placed, and is configured, for example, by a fan coil unit. Note that in addition to the cooling and heating air conditioner, other heating devices (for example, heating devices such as fan convectors, panel radiators, and floor heating devices, or bathroom heating devices that heat, dry, and ventilate the bathroom) may also be installed.

[0015] The heat pump unit 10 includes a heat pump 11 having a known configuration. The heat pump 11 includes a heat medium-side heat exchanger 12 and a refrigerant circuit 13 including a compressor, an outdoor air-side heat exchanger, and an expansion mechanism (not shown). The refrigerant circuit 13 is capable of circulating a refrigerant from the outdoor air-side heat exchanger through the compressor, the heat medium-side heat exchanger 12, and the expansion mechanism in that order. In this state, heat absorbed by the refrigerant from the outdoor air via the outdoor air-side heat exchanger is dissipated via the heat medium-side heat exchanger 12 to a first heat medium flowing through a first heat medium circuit 40 (described later), thereby heating the first heat medium.

[0016] The refrigerant circuit 13 can also circulate the refrigerant from the heat medium-side heat exchanger 12 through the compressor, the outdoor air-side heat exchanger, and the expansion mechanism in that order. In this state, heat absorbed by the refrigerant from the first heat medium flowing through the first heat medium circuit 40 (described later) via the heat medium-side heat exchanger 12 can be released to the outdoor air via the outdoor air-side heat exchanger, thereby cooling the first heat medium. Therefore, the heat pump unit 10 functions as a heat source capable of heating and cooling the first heat medium.

[0017] The combustion heat source machine 20 is equipped with a heating section 21 that heats the second heat medium. The heating section 21 is composed of a burner 22 and a heat exchanger 23 that is heated by the heat of combustion of the burner 22. The burner 22 is, for example, a gas burner, to which fuel gas is supplied from a fuel supply source (not shown) via a fuel supply path 24, and combustion air is supplied by the operation of a combustion fan (not shown). The fuel supply path 24 is fitted with an on-off valve 25 that can open and close the fuel supply path 24, and a fuel adjustment valve 26 that adjusts the amount of fuel gas supplied to the burner 22. The on-off valve 25 may be composed of a solenoid valve or the like, and the fuel adjustment valve 26 may be composed of a proportional valve or the like.

[0018] The burner 22 starts combustion operation by igniting the burner 22 with an ignition device (not shown) while the combustion fan is activated and the on-off valve 25 is controlled to be open. During combustion operation of the burner 22, the combustion amount of the burner 22 can be controlled by controlling the fuel adjustment valve 26 and the combustion fan. Furthermore, the burner 22 is extinguished by controlling the on-off valve 25 to be closed. The fuel for the burner 22 is not limited to gaseous fuel, and may be liquid fuel such as kerosene.

[0019] The heat exchanger 23 of the heating unit 21 is connected to a second heat medium circuit 50 (described later) so that the second heat medium flows through the second heat medium circuit 50, and is configured to heat the second heat medium by dissipating combustion heat provided by the combustion operation of the burner 22 to the second heat medium. Note that the heating unit 21 may also be provided with a bypass path that allows the second heat medium to flow from the upstream side to the downstream side of the heat exchanger 23 without passing through the heat exchanger 23, and a control valve for adjusting the ratio between the flow rate of the second heat medium passing through the bypass path and the flow rate of the second heat medium passing through the heat exchanger 23.

[0020] The air conditioning system 1 further includes a heat exchanger unit 30 including a liquid-liquid heat exchanger 31 that exchanges heat between a first heat medium heated by the heat pump 11 and a second heat medium heated by the heating section 21; a first heat medium circuit 40 that connects the heat medium side heat exchanger 12 of the heat pump 11 and the air conditioner 3 for heating and cooling so as to circulate the first heat medium therebetween; a second heat medium circuit 50 that connects the heat exchanger 23 of the combustion heat source machine 20 and the heat exchanger 31 of the heat exchanger unit 30 so as to circulate the second heat medium therebetween; and a bypass circuit 41e that connects the upstream and downstream sides of the first heat medium circuit 40 of the heat exchanger 31 and bypasses the heat exchanger 31.

[0021] The heat exchanger unit 30 has a box body 300, and the heat exchanger 31, bypass circuit 41e, etc. are housed within the box body 300. The heat exchanger 31 of the heat exchanger unit 30 is provided so as to perform heat exchange between a first flow path 31a through which a first heat medium to be heated by the heat pump 11 flows and a second flow path 31b through which a second heat medium to be heated by the heating section 21 flows. Therefore, the heat exchanger 31 is connected to a position downstream of the heat medium-side heat exchanger 12 of the heat pump 11 in the first heat medium circuit 40 and upstream of the heating and cooling air conditioner 3. The first flow path 31a in the heat exchanger 31 forms part of the first heat medium circuit 40, and the second flow path 31b in the heat exchanger 31 forms part of the second heat medium circuit 50.

[0022] The first heat medium circuit 40 has an outgoing path 41 that supplies the first heat medium from the heat medium-side heat exchanger 12 of the heat pump 11 to the air conditioning unit 3 for heating and cooling, and a returning path 42 that returns the first heat medium from the air conditioning unit 3 for heating and cooling to the heat medium-side heat exchanger 12. The outgoing path 41 is provided with a first flow path 31a of the heat exchanger 31 of the heat exchanger unit 30, and a bypass circuit 41e that branches off from the upstream side of the first flow path 31a to the downstream side and allows the first heat medium to flow without passing through the first flow path 31a.

[0023] Specifically, the outgoing path 41 of the first heat medium circuit 40 includes a first outgoing path 41a that connects the heat medium outlet of the heat medium-side heat exchanger 12 of the heat pump 11 to the heat medium inlet of the first flow path 31a of the heat exchanger 31, and a second outgoing path 41b that has an upstream end connected to the heat medium outlet of the first flow path 31a of the heat exchanger 31 and a downstream end connected to the heat medium inlet of the air conditioner 3 for heating and cooling. The bypass circuit 41e branches off from a portion of the first outgoing path 41a and merges with a portion of the second outgoing path 41b so as to be connected to the outgoing path 41 of the first heat medium circuit 40 in parallel with the first flow path 31a of the heat exchanger 31. Although the heat exchanger 31 and the bypass circuit 41e are entirely housed in the box 300 in FIG. 1 , at least a portion of these may be housed in the box 300 depending on the installation location.

[0024] The return path 42 of the first heat medium circuit 40 has its upstream end connected to the heat medium outlet of the air conditioner 3 for heating and cooling, and its downstream end connected to the heat medium inlet of the heat medium-side heat exchanger 12 of the heat pump 11.

[0025] An electric pump 43 serving as a power source for circulating the heat medium is attached to the first outgoing line 41a upstream of the connection between the first outgoing line 41a of the outgoing line 41 and the bypass circuit 41e. In the present embodiment, the pump 43 is mounted on the heat pump unit 10. However, the pump 43 may be mounted on the heat exchanger unit 30, for example, or may be disposed outside the heat pump unit 10 and the heat exchanger unit 30. The pump 43 may also be attached to the second outgoing line 41b of the outgoing line 41 downstream of the connection between the second outgoing line 41b and the bypass circuit 41e, or to the return line 42.

[0026] In addition, a three-way valve 44, which is an electrically operated valve device, is attached to the connection between the first outbound path 41a and the bypass circuit 41e. The three-way valve 44 can be switched between an operating state in which the first heat medium flows from the first outbound path 41a on the upstream side thereof only through the first flow path 31a of the heat exchanger 31 and the bypass circuit 41e is blocked (an operating state in which the first flow path 31a of the heat exchanger 31 is opened to the first outbound path 41a on the upstream side of the three-way valve 44 and the bypass circuit 41e is blocked), and an operating state in which the first heat medium flows from the first outbound path 41a on the upstream side thereof only through the bypass circuit 41e and the first flow path 31a of the heat exchanger 31 is blocked (an operating state in which the first flow path 31a of the heat exchanger 31 is blocked to the first outbound path 41a on the upstream side of the three-way valve 44 and the bypass circuit 41e is opened).

[0027] In addition, the three-way valve 44 may be configured to adjust the ratio between the flow rate of the first heat medium flowing through the first flow path 31a of the heat exchanger 31 and the flow rate of the first heat medium flowing through the bypass circuit 41e to a required target ratio (including the case where the flow rate through the first flow path 31a is set to zero and the case where the flow rate through the bypass circuit 41e is set to zero).

[0028] In this embodiment, the three-way valve 44 is mounted on the heat exchanger unit 30. However, the three-way valve 44 may also be disposed outside the heat exchanger unit 30. The three-way valve 44 may also be attached to the connection between the second outward path 41b and the bypass circuit 41e. Instead of the three-way valve 44, an open / close valve or a flow control valve may be provided in each of the bypass circuit 41e and the flow path that passes through the first flow path 31a of the heat exchanger 31 from the connection between the first outward path 41a and the bypass circuit 41e to the connection between the second outward path 41b and the bypass circuit 41e.

[0029] A thermal valve 46 is attached to the second outward path 41b connected to the cooling and heating air conditioner 3. The thermal valve 46 may be attached to the return path 42 or may be mounted on the cooling and heating air conditioner 3.

[0030] Since the first heat medium circuit 40 is configured as described above, when the pump 43 is operated with the thermal valve 46 open, the first heat medium flows back from the heat medium-side heat exchanger 12 of the heat pump 11 via the outward path 41, the air conditioner 3 for heating and cooling, and the return path 42 in this order to the heat medium-side heat exchanger 12, thereby circulating the first heat medium between the heat medium-side heat exchanger 12 and the air conditioner 3 for heating and cooling. In this case, by controlling the operation of the three-way valve 44, the first heat medium can be made to flow via either (or both) the first flow path 31a of the heat exchanger 31 or the bypass circuit 41e.

[0031] The second heat medium circuit 50 includes an outward path 51 that supplies the second heat medium from the heat exchanger 23 of the heating section 21 of the combustion heat source machine 20 to the second flow path 31b of the heat exchanger 31 of the heat exchanger unit 30, and a return path 52 that returns the heat medium from the second flow path 31b of the heat exchanger 31 to the heat exchanger 23 of the heating section 21.

[0032] The outgoing path 51 is arranged to connect the heat medium outlet of the heat exchanger 23 of the heating section 21 to the heat medium inlet of the second flow path 31b of the heat exchanger 31 of the heat exchanger unit 30, and the returning path 52 is arranged to connect the heat medium outlet of the second flow path 31b of the heat exchanger 31 of the heat exchanger unit 30 to the heat medium inlet of the heat exchanger 23 of the heating section 21. A circulation pump 53 is attached to the returning path 52 as a power source for circulating the second heat medium.

[0033] In this embodiment, the circulation pump 53 is mounted on the combustion type heat source machine 20. However, the circulation pump 53 may be disposed outside the combustion type heat source machine 20, or may be attached to the outgoing path 51.

[0034] Since the second heat medium circuit 50 is configured as described above, when the circulation pump 53 is operated, the second heat medium flows back from the heat exchanger 23 of the heating section 21 via the outward path 51, the second flow path 31b of the heat exchanger 31, and the return path 52 in that order to the heat exchanger 23 of the heating section 21, thereby allowing the second heat medium to circulate between the heat exchanger 23 of the heating section 21 and the heat exchanger 31 of the heat exchanger unit 30.

[0035] 2, the air conditioning system 1 includes a control device 80 that controls the operation of the air conditioning system 1, and a remote control 85 that enables a user to operate the air conditioning system 1. The control device 80 is configured by one or more electronic circuit units including, for example, a processor such as a microcomputer (not shown), memory (RAM, ROM, etc.), an interface circuit, a communication circuit, etc.

[0036] For example, the control device 80 can be configured as a collection of multiple electronic circuit units that are mounted on each of the heating and cooling air conditioners 3, the heat pump unit 10, the combustion heat source unit 20, and the heat exchanger unit 30, and that can communicate with each other and work together to control the operation of the air conditioning system 1.

[0037] The control device 80 receives input of sensing signals (detection signals) from a plurality of sensors, such as a plurality of temperature sensors 90, provided in the air conditioning system 1. In this embodiment, the temperature sensors 90 include, for example, a temperature sensor 90a that detects the temperature of the first heat medium (the temperature of the first heat medium flowing out of the heat medium-side heat exchanger 12) flowing from the heat medium-side heat exchanger 12 of the heat pump 11 through the outgoing line 41 (first outgoing line 41a) of the first heat medium circuit 40 into the three-way valve 44, a temperature sensor 90b that detects the temperature of the first heat medium supplied to the cooling and heating air conditioner 3 through the outgoing line 41 (second outgoing line 41b) downstream of the first flow path 31a of the heat exchanger 31 and the bypass circuit 41e, and a temperature sensor 90c that detects the temperature of the first heat medium supplied to the cooling and heating air conditioner 3 through the outgoing line 41 (second outgoing line 41b) downstream of the heating section 21. The heat exchanger unit 30 includes a temperature sensor 90c that detects the temperature of the second heat medium flowing out from the heat exchanger 23 to the outward path 51 of the second heat medium circuit 50, a temperature sensor 90d that detects the temperature of the second heat medium flowing from the outward path 51 into the second flow path 31b of the heat exchanger 31, a temperature sensor 90e that detects the temperature of the second heat medium flowing out from the second flow path 31b of the heat exchanger 31 to the return path 52 of the second heat medium circuit 50, and an internal box temperature sensor (internal box temperature detection means) 90f that is provided near the bottom surface of the box body 300 of the heat exchanger unit 30 and detects the internal temperature within the box body 300.

[0038] The control device 80 can also communicate with the remote control 85 via wire or wirelessly. Through this communication, the control device 80 can receive command information related to the operation of the cooling and heating air conditioner 3 from the remote control 85, and can transmit various notification information to the remote control 85 to output it.

[0039] The control device 80 has a function realized by the implemented hardware configuration and program (software configuration) to execute control processing related to the operation of the cooling and heating air conditioner 3. In this case, the control device 80 can control the operation of the heat pump 11, the burner 22 of the heating unit 21, the three-way valve 44, the thermal valve 46, and the pumps 43 and 53, which are the elements to be controlled, and controls the operation of the cooling and heating air conditioner 3 through this operation control.

[0040] In the operation control of the heat pump 11, switching between heating and cooling of the first heat medium is controlled by controlling the switching of the flow path of the refrigerant circuit 13 and the operation of the compressor, and the output of the heat pump 11 is controlled. In addition, in the operation control of the burner 22, ignition of the burner 22, adjustment of the combustion amount, and extinguishing are performed by controlling the operation of the on-off valve 25 and the fuel adjustment valve 26 of the fuel supply path 24, as well as the ignition device and combustion fan (not shown).

[0041] Next, the operation of the cooling and heating air conditioner 3 in the air conditioning system 1 of this embodiment during cooling operation will be described with reference to Figures 3 and 4. In these figures, thick solid lines indicate flow paths when the heat medium is flowing, and thin dashed lines indicate flow paths when the heat medium is not flowing.

[0042] During cooling operation of the cooling and heating air conditioner 3, the control device 80 operates the heat pump 11 in a cooling operation mode (an operation mode in which the refrigerant circuit 13 is operated so as to flow cooled refrigerant through the heat medium-side heat exchanger 12), and operates the pump 43 with the thermal valve 46 open. The control device 80 also operates the three-way valve 44 of the first heat medium circuit 40 so as to flow the first heat medium only through the bypass circuit 41e out of the first flow path 31a and the bypass circuit 41e of the heat exchanger 31 of the heat exchanger unit 30.

[0043] As a result, as shown in Figure 3, the first heat medium cooled in the heat medium side heat exchanger 12 circulates between the heat pump 11 and the heating and cooling air conditioner 3 via the bypass circuit 41e without passing through the first flow path 31b of the heat exchanger 31, and is supplied to the heating and cooling air conditioner 3, thereby performing cooling operation of the heating and cooling air conditioner 3 (heat absorption operation from the indoor space by the heating and cooling air conditioner 3).

[0044] During cooling operation, the control device 80 monitors the internal temperature output from the internal temperature sensor 90f. When the internal temperature drops below a predetermined temperature (for example, 26°C or below, assuming worst-case conditions of an outside air temperature of 30°C and humidity of 80%), the control device 80 activates the circulation pump 53. As a result, as shown in FIG. 4, the second heat medium circulates through the second heat medium circuit 50 between the heating unit 21 and the heat exchanger 31 of the heat exchanger unit 30 via the second flow path 31b of the heat exchanger 31. The temperature of the unheated second heat medium is approximately room temperature, which is higher than the temperature of the first heat medium after circulating through the heat medium-side heat exchanger 12 of the heat pump 11. Therefore, by circulating the second heat medium through the second flow path 31b of the heat exchanger 31, the temperature of the heat exchanger 31 can be increased, thereby preventing a decrease in the internal temperature of the box 300. This prevents condensation. Alternatively, when the internal temperature of the box 300 rises above a predetermined temperature, the control device 80 may stop the circulation pump 53 to stop the circulation of the second heat medium. Furthermore, even if the second heat medium at room temperature is circulated through the heat exchanger 31 for a predetermined time or more, if the internal temperature inside the box body 300 is below a predetermined temperature, the burner 22 of the heating section 21 of the combustion type heat source unit 20 may be operated in combustion mode until the internal temperature inside the box body 300 becomes higher than the predetermined temperature.

[0045] As explained in detail above, according to this embodiment, even when the first heat medium is cooled by the heat pump 11 and supplied to the air conditioning unit 3 for heating and cooling, it is possible to suppress a decrease in the internal temperature inside the box body 300 that houses the heat exchanger 31 and the bypass circuit 41e. Therefore, during cooling operation in the summer, it is possible to prevent the temperature of the outer surface of the box body 300 from falling below the condensation temperature, thereby preventing condensation.

[0046] Furthermore, according to this embodiment, the circulation pump 53 is operated to circulate the unheated second heat medium through the heat exchanger 31 only when the internal temperature inside the box body 300 falls below a predetermined temperature, thereby making it possible to prevent condensation efficiently and with low energy consumption.

[0047] Furthermore, in this embodiment, the second heat medium at room temperature is supplied to the heat exchanger 31 during cooling operation, but the first heat medium does not flow through the heat exchanger 31, so it is possible to prevent the cooled first heat medium from absorbing heat in the heat exchanger 31. This makes it possible to reduce energy loss during cooling operation.

[0048] To briefly explain the operation of the cooling and heating air conditioner 3 in the air conditioning system 1 of this embodiment during heating operation, when the cooling and heating air conditioner 3 is in heating operation, the control device 80 first operates the heat pump 11 in a heating operation mode (an operation mode in which the refrigerant circuit 13 is operated so as to flow heated refrigerant to the heat medium side heat exchanger 12), and also operates the pump 43 with the thermal valve 46 open.

[0049] As a result, the first heat medium circulates between the heat medium side heat exchanger 12 of the heat pump 11 and the heating and cooling air conditioner 3 via the first heat medium circuit 40, and the first heat medium heated in the heat medium side heat exchanger 12 is supplied to the heating and cooling air conditioner 3, thereby performing heating operation of the heating and cooling air conditioner 3 (heat dissipation operation from the heating and cooling air conditioner 3 to the indoor space).

[0050] At this time, if the temperature of the first heat medium supplied to the air conditioning unit 3 for heating and cooling can be raised to the target temperature by operating the heat pump 11 alone, the control device 80 operates the three-way valve 44 of the first heat medium circuit 40 so that the first heat medium flows only through the bypass circuit 41e of the first flow path 31a of the heat exchanger 31 of the heat exchanger unit 30 and the bypass circuit 41e.

[0051] Furthermore, if the temperature of the first heat medium supplied to the air conditioning unit 3 for heating and cooling cannot be raised to the target temperature even when the heat pump 11 is operated at the upper limit output, the control device 80, in addition to operating the heat pump 11 and the pump 43, operates the circulation pump 53 while starting the combustion operation of the burner 22 of the heating section 21 of the combustion type heat source unit 20, and further operates the three-way valve 44 so that the first heat medium flows only through the first flow path 31a of the first flow path 31a and the bypass circuit 41e of the heat exchanger 31 of the heat exchanger unit 30, or through both the first flow path 31a and the bypass circuit 41e.

[0052] As a result, the first heat medium supplied to the cooling and heating air conditioner 3 is not only heated by the heat medium-side heat exchanger 12 of the heat pump 11, but also heated by heat exchange with the second heat medium (the second heat medium heated by the heat exchanger 23 of the heating section 21) flowing through the second flow path 31b of the heat exchanger 31 while flowing through the first flow path 31a of the heat exchanger 31. This makes it possible to reduce energy loss during heating operation.

[0053] (Other embodiments) In the above embodiment, when the internal temperature of the box body 300 falls below a predetermined temperature, the circulation pump 53 is operated to circulate the second heat medium to the heat exchanger 31. However, during cooling operation, the circulation pump 53 may be operated to circulate the second heat medium to the heat exchanger 31 even if the internal temperature of the box body 300 is higher than the predetermined temperature. [Explanation of symbols]

[0054] 1. Air conditioning system 3. Air conditioning equipment for heating and cooling 10 Heat pump unit 20 Combustion-type heat source machine 31 Heat exchanger 40 1st heating medium circuit 41e Bypass circuit 44 Three-way valve 50 2nd heating medium circuit 53 Circulation Pump 80 Control device 300 box body

Claims

1. a first heat source capable of heating and cooling a first heat medium; a second heat source capable of heating a second heat medium; an air conditioner capable of selectively heating and cooling the indoor space by performing heat exchange between a first heat medium and the indoor space; a first heat medium circuit that circulates a first heat medium between the first heat source and the air conditioning device; a heat exchanger connected to a position downstream of the first heat source and upstream of the air conditioner in the first heat medium circuit; a second heat medium circuit that circulates a second heat medium between the second heat source and the heat exchanger; a circulation pump that circulates the second heat medium between the second heat source and the heat exchanger; a bypass circuit connecting the first heat medium circuit upstream and downstream of the heat exchanger to bypass the heat exchanger; a valve device that blocks the first heat medium circuit in the heat exchanger on at least one of the upstream side and the downstream side of the heat exchanger so that the first heat medium after circulating through the first heat source does not flow into the heat exchanger but flows into the bypass circuit; a box that accommodates at least a portion of the heat exchanger and at least a portion of the bypass circuit; a control device; When the first heat medium is cooled by the first heat source and supplied to the air conditioning device, the control device operates the valve device so that the first heat medium that has circulated through the first heat source does not flow into the heat exchanger but instead flows through a bypass circuit, and also operates the circulation pump to circulate the second heat medium between the second heat source and the heat exchanger.

2. The air conditioning system according to claim 1 further comprises: a box internal temperature detection means for detecting an internal temperature of the box; The control device is an air conditioning system in which, when the internal temperature of the box falls below a predetermined temperature, the control device activates a circulation pump to circulate a second heat medium between the second heat source and the heat exchanger.

3. 3. The air conditioning system according to claim 1, The control device operates a circulation pump to circulate a second heat medium that is not heated by the second heat source between the second heat source and the heat exchanger.

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