JP2023088561A - Air-conditioning system - Google Patents

Abstract

To provide an air-conditioning system capable of: heating or cooling a heat medium to be distributed to an air-conditioning device using either one or both of two heat sources, a first heat source and a second heat source; and curbing radiation heat loss and pressure loss in a flow passage to circulate the heat medium through the air-conditioning device.SOLUTION: An air-conditioning system 1 comprises: a heat medium circuit 40 which connects a first heat source 10 and a second heat source 20 in parallel to each other with respect to air-conditioning devices 2 and 3 so as to circulate a heat medium between either one or both of the first heat source 10 and the second heat source 20 and the air-conditioning devices 2 and 3; and a flow passage switching device 45 which switches a flow passage in the heat medium circuit 40. By switching the flow passage, the air-conditioning system is capable of executing cooling operation with the heat medium cooled with the first heat source 10 and heating operation with the heat medium heated with either one or both of the first heat source 10 and the second heat source 20.SELECTED DRAWING: Figure 1

Description

The present invention relates to an air conditioning system that utilizes a heat medium.

Conventionally, as seen in Patent Documents 1 and 2, for example, in a flow path for circulating a heat medium in an air conditioner such as a heating terminal, a heat pump heat exchanger and a heat exchanger heated by a burner are connected in series. Air conditioning systems are known in which the flow path is configured to circulate to the air. Patent Documents 1 and 2 disclose that the heat medium supplied to the air conditioner is normally heated only by the heat pump during the heating operation of the air conditioner, and when the heating amount of the heat medium is insufficient, the heat pump and the burner are used. A technique for heating a heat transfer medium by both is described. Patent document 1 also describes heating a heat medium only by a burner.

JP-A-11-287530 JP 2019-49383 A

As seen in Patent Documents 1 and 2, when a heat medium is serially circulated in a heat pump heat exchanger and a heat exchanger heated by a burner, the heat medium discharged from the air conditioner is supplied to the air conditioner. Since the path length of the heat medium to return tends to be long, there is an inconvenience that heat loss and pressure loss tend to occur.

In particular, as seen in Patent Document 2, in an air-conditioning system in which a heat medium is constantly circulated in series between a heat pump heat exchanger and a heat exchanger heated by a burner, either the heat pump or the burner Even in the case of heating the heat medium with a chisel, the heat transfer loss tends to increase because the heat medium is circulated through the heat exchanger on the other side. In addition, when the air conditioner is operated for cooling, the heat medium cooled by the heat pump passes through the heat exchanger on the burner side, and the heat exchanger tends to deteriorate due to dew condensation or the like.

The present invention has been made in view of this background, and is capable of heating or cooling a heat medium circulated in an air conditioner by one or both of two heat sources, a first heat source and a second heat source, and an air conditioner. An object of the present invention is to provide an air conditioning system capable of suppressing heat radiation loss and pressure loss in a flow path for circulating a heat medium through an apparatus.

In order to achieve the above objects, the air conditioning system of the present invention includes:
a first heat source capable of heating or cooling a heat medium;
a second heat source capable of heating the heat medium;
an air conditioner that air-conditions the indoor space by exchanging heat between the heat medium and the indoor space;
The first heat source and the second heat source are connected in parallel to the air conditioner so that the heat medium can be circulated between one or both of the first heat source and the second heat source and the air conditioner. a heat medium circuit;
One or more switching valves provided in the heat medium circuit form a flow path for circulating the heat medium between the first heat source and the air conditioner without passing through the second heat source. a first operating state; a second operating state in which a flow path is formed for circulating the heat medium between the second heat source and the air conditioner without passing through the first heat source; a channel switching device selectively operable in a third operating state forming a channel for circulation between both the first heat source and the second heat source and the air conditioner;
A cooling operation in which the heat medium is cooled by the first heat source while the heat medium is circulated between the first heat source and the air conditioner in a state in which the flow path switching device is operated in the first operating state. and heating the heat medium by the first heat source while circulating the heat medium between the first heat source and the air conditioner in a state in which the flow path switching device is operated in the first operating state. In a first heating operation and a state in which the flow path switching device is operated in the second operation state, the heat medium is circulated between the second heat source and the air conditioner while the heat medium is transferred to the second heat source. In a second heating operation in which heating is performed by a heat source, and in a state in which the flow path switching device is operated in the third operating state, the heat medium is supplied between both the first heat source and the second heat source and the air conditioner. is configured to be capable of performing a third heating operation in which the heat medium is heated by the first heat source and the second heat source while circulating the heat medium (first invention).

According to the first aspect of the invention, the flow path of the heat medium in the heat medium circuit can be switched by switching the operating state of the flow path switching device. a first heating operation in which the heat medium heated only by the first heat source out of the first heat source and the second heat source is circulated through the air conditioner; and heating by only the second heat source out of the first heat source and the second heat source. It is possible to perform a second heating operation in which the heated heat medium is circulated through the air conditioner, and a third heating operation in which the heat medium heated by both the first heat source and the second heat source is circulated through the air conditioner.

In this case, the first heat source and the second heat source are connected in parallel to the air conditioner. It is possible to shorten the path length of the flow path for circulating the heat medium between the heat source and the air conditioner. As a result, it is possible to suppress heat loss and pressure loss in these flow paths.
Therefore, according to the first invention, it is possible to heat and cool the heat medium circulating in the air conditioner, and to suppress heat loss and pressure loss in the flow path for circulating the heat medium through the air conditioner.

In the first invention, the heat medium circuit includes a first outward path connected to the first heat source so as to deliver the heat medium from the first heat source, and a first outward path connected to the first heat source to return the heat medium to the first heat source. a first return path connected to the first heat source; a second outward path connected to the second heat source so as to deliver the heat medium from the second heat source; and a return path of the heat medium to the second heat source. A second return path connected to the second heat source so as to allow the heat medium to flow is connected to the first and second outward paths so that the first and second outward paths merge, and a heat medium supply path connected to the air conditioner so as to supply the heat medium to the air conditioner; It can be configured as a circuit including a heating medium discharge path branched to a return path (second invention).
This makes it possible to realize a heat medium circuit that connects the first heat source and the second heat source in parallel with the air conditioner.

In the first invention or the second invention, the heat medium circuit is provided in a flow path passing through only the first heat source out of the first heat source and the second heat source in the heat medium circuit. It is preferable to provide a pump and a second pump provided in a flow path passing through only the second heat source out of the first heat source and the second heat source (third invention).

According to this, particularly in the third heating operation, the flow rate of the heat medium passing through the first heat source and the flow rate of the heat medium passing through the second heat source can be increased or decreased according to the operating state of the air conditioner. becomes possible. Further, even if one of the first pump and the second pump fails, the heat medium heated by the heat source corresponding to the other pump (normal pump) out of the first heat source and the second heat source can be supplied to the air conditioner to operate the air conditioner (heating operation).

In the third aspect of the invention, the required heat amount determination unit that determines the required heat amount of the air conditioner according to the request for the temperature state of the indoor space, the control of the respective heating amounts of the first heat source and the second heat source, and the a control unit that controls the operation of each of the first pump and the second pump, and the control unit controls, during execution of the first heating operation, as the amount of heat required by the air conditioner increases, When switching from the first heating operation to the third heating operation, while maintaining the heating amount of the first heat source and the rotation speed of the first pump in the same state as during the first heating operation, It is possible to employ a mode in which the heating amount of the second heat source and the rotational speed of the second pump are controlled so as to realize the required heat amount after the increase of the air conditioner (fourth invention). .

According to this, when switching from the first heating operation to the third heating operation due to an increase in the amount of heat required by the air conditioner during the execution of the first heating operation, the heating amount of the first heat source and the heat amount of the first heat source The heating amount of the second heat source and the rotation speed of the second pump are adjusted so as to achieve the required heat amount after the increase of the air conditioner while maintaining the rotation speed of the first pump in the same state as in the first heating operation. Since it controls, it becomes possible to perform operation control of the 1st heat source, the 2nd heat source, the 1st pump, and the 2nd pump in a simple mode. Also, the heating amount of the second heat source and the rotation speed of the second pump are increased while the heating amount of the first heat source and the rotation speed of the first pump are maintained. For this reason, compared to the case where not only the heating amount of the second heat source and the rotation speed of the second pump but also the heating amount of the first heat source and the rotation speed of the first pump are changed, the heat medium supplied to the air conditioner Therefore, it is possible to suppress the temperature of the air conditioner from excessively fluctuating transiently.

In the above first to fourth inventions, the second heat source includes, as a heating unit for heating the heat medium, a low temperature side heating unit for heating the heat medium to a low temperature side temperature out of two types of high and low temperatures, and a high temperature side temperature and a high temperature side heating section that heats a heat medium to the high temperature side heating section, the heat medium circuit includes a flow path that passes through the low temperature side heating section as a flow path that passes through the second heat source, and the high temperature A mode can be employed in which the side heating unit is connected to the heat dissipation device via a circulation path so as to circulate the heat medium between the heat dissipation device that dissipates heat from the heat medium heated to the high temperature side temperature. . In this case, the circulation path is preferably configured so as not to allow the heat medium supplied from the high-temperature side heating section to the heat dissipation device to flow into the heat medium circuit (fifth invention).

According to this, when the heat radiating device is in operation, the heat medium having the high temperature side temperature supplied to the heat radiating device from the high temperature side heating portion is prevented from flowing into the heat medium circuit. It is possible to prevent the heat medium having a temperature higher than the low temperature from being supplied to the air conditioner during the cooling operation or the heating operation. As a result, the heat dissipation device can be operated while appropriately performing the cooling operation and the heating operation of the air conditioner.

The figure which shows the structure of the air-conditioning system of 1st Embodiment of this invention. The block diagram which shows the structure which concerns on the operation|movement control of the air-conditioning system of embodiment. The figure which shows the structure of the air-conditioning system of 2nd Embodiment of this invention.

[First embodiment]
A first embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. As shown in FIG. 1, the air conditioning system 1 of the present embodiment includes a heating air conditioner 2, a cooling and heating air conditioner 3, and a bathroom heater 4 as air conditioners, and a second heating device capable of heating or cooling a heat medium. The system includes a heat pump unit 10 as one heat source and a combustion heat source device 20 as a second heat source capable of heating a heat medium. As a heat medium in the air conditioning system 1, for example, water, antifreeze, or the like can be used.

The heating air conditioner 2, the cooling and heating air conditioner 3, and the bathroom heater 4 each have a flow path (not shown) for circulating the heat medium, and the heat medium flowing through the flow path and the indoor space where they are arranged It is a known air conditioner that heats or cools an indoor space by exchanging heat with the space. The heating air conditioner 2 is an air conditioner for heating the indoor space in which it is installed, and is composed of, for example, a fan convector, a panel heater, a floor heating device, or the like. The cooling/heating air conditioner 3 is an air conditioner for cooling or heating the indoor space in which it is installed, and is configured by, for example, a fan coil unit. The bathroom heater 4 is an air conditioner capable of heating, drying, and ventilating the bathroom in which it is installed.

In this embodiment, the heating air conditioner 2 and the cooling/heating air conditioner 3 correspond to the air conditioner in the present invention, and the bathroom heater 4 corresponds to the heat dissipation device in the present invention. In the following description, the heating air conditioner 2 and the cooling/heating air conditioner 3 are simply referred to as the air conditioners 2 and 3 when there is no need to distinguish between them.

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 (not shown), an outside air side heat exchanger, and an expansion mechanism. In this case, the refrigerant circuit 13 can circulate the refrigerant sequentially from the outside air side heat exchanger to the compressor, the heat medium side heat exchanger 12, and the expansion mechanism. The heat absorbed by the refrigerant through the outside air side heat exchanger can be radiated to the heat medium flowing through the heat medium circuit 40 described later via the heat medium side heat exchanger 12 to heat the heat medium. is.

In addition, the refrigerant circuit 13 can circulate the refrigerant from the heat medium side heat exchanger 12 through the compressor, the outside air side heat exchanger, and the expansion mechanism in this order. Heat absorbed by the refrigerant from the heat medium flowing through the medium circuit 40 through the heat medium side heat exchanger 12 is radiated to the outside air through the outside air side heat exchanger, thereby cooling the heat medium. . Therefore, the heat pump unit 10 functions as a heat source capable of heating or cooling the heat medium.

The combustion type heat source device 20 includes a low temperature side heating portion 21a for heating the heat medium to a low temperature side temperature (for example, a temperature of 40 to 60 ° C.) as a heating portion for heating the heat medium, and a high temperature side higher than the low temperature side temperature. and a high temperature side heating section 21b for heating to a temperature (for example, a temperature of 70 to 80° C.).

The low temperature side heating section 21a is composed of a first burner 22a and a first heat exchanger 23a heated by the combustion heat thereof, and the high temperature side heating section 21b is composed of a second burner 22b and the combustion heat thereof. and a second heat exchanger 23b. The first burner 22a and the second burner 22b are gas burners, for example. A fuel supply device 24 for supplying fuel gas to the first burner 22a and the second burner 22b supplies fuel gas from a fuel supply source (not shown) to the main fuel supply passage 25 and to each of the first burner 22a and the second burner 22b. It is configured to supply fuel gas to each of the first burner 22a and the second burner 22b via separate sub-fuel supply paths 26a and 26b.

In this case, the main fuel supply passage 25 is assembled with an on-off valve 27 capable of opening and closing it. Also, an on-off valve 28a capable of opening and closing the auxiliary fuel supply passage 26a on the side of the first burner 22a and a fuel control valve 29a for adjusting the amount of fuel gas supplied to the first burner 22a are assembled. It is Similarly, an on-off valve 28b capable of opening and closing the auxiliary fuel supply passage 26b on the side of the second burner 22b and a fuel adjustment valve 29b for adjusting the amount of fuel gas supplied to the second burner 22b are assembled. attached. The on-off valves 27, 28a, 28b can be constituted by solenoid valves or the like, and the fuel control valves 29a, 29b can be constituted by proportional valves or the like.

Therefore, the first burner 22a starts combustion operation by being ignited by an ignition device (not shown) while the on-off valves 27 and 28a are controlled to be opened. During the combustion operation of the first burner 22a, the amount of combustion of the first burner 22a can be controlled by controlling the fuel control valve 29a. Furthermore, the first burner 22a is extinguished by controlling the closing of the on-off valve 27 or 28a.

Similarly, the second burner 22b starts combustion operation by being ignited by an ignition device (not shown) while the on-off valves 27 and 28b are controlled to be opened. During the combustion operation of the second burner 22b, it is possible to control the amount of combustion of the second burner 22b by controlling the fuel control valve 29b. Furthermore, the second burner 22b is extinguished by closing the on-off valve 27 or 28b. In addition, the fuel of the 1st burner 22a and the 2nd burner 22b may be not only gaseous fuel but liquid fuel, such as kerosene.

The first heat exchanger 23a is connected to the heat medium circuit 40 so that the heat medium flows through the heat medium circuit 40, which will be described later. By radiating heat to the medium, the heat medium can be heated.

The second heat exchanger 23 b is connected to the bathroom heater 4 via a circulation path 31 that circulates the heat medium with the bathroom heater 4 . The second heat exchanger 23b radiates the combustion heat given by the combustion operation of the second burner 22b to the heat medium flowing back from the bathroom heater 4 through the circulation path 31, thereby heating the heat medium. , the heated heat medium is sent to the bathroom heating device 4 via the circulation path 31 .

More specifically, the circulation path 31 flows the heat medium supplied to the bathroom heater 4 from the second heat exchanger 23b to the bathroom heater 4 at the downstream end (second heat exchanger) of the second heat exchanger 23b. A forward path 31a that connects the downstream end of the flow path of the heat medium in the exchanger 23b to the bathroom heater 4, and the heat medium discharged from the bathroom heater 4 is transferred from the bathroom heater 4 to the second heat exchanger 23b. A return path 31b connects the upstream end of the second heat exchanger 23b (the upstream end of the flow path of the heat medium in the second heat exchanger 23b) to the bathroom heater 4 so as to flow.

An electric pump 32 as a power source for circulating the heat medium in the circulation path 31 is assembled to one of the outward path 31a and the return path 31b, for example, the return path 31b. In addition, one of the outward path 31a and the return path 31b, for example, the outward path 31a, is assembled with an on-off valve 33 such as an electromagnetic valve for opening and closing this (and thus opening and closing the circulation path 31). Further, a temperature sensor 34 for detecting the temperature of the heat medium supplied from the second heat exchanger 23b to the bathroom heater 4 is assembled in the outward path 31a.

Note that the high-temperature side heating unit 21b includes a bypass path that bypasses the second heat exchanger 23b from the return path 31b of the circulation path 31 to the outward path 31a to flow the heat medium, and a flow rate of the heat medium in the bypass path and the second heat exchange. A control valve may be provided for adjusting the ratio with the flow rate of the heat medium in the vessel 23b.

The heat medium side heat exchanger 12 of the heat pump 11 and the first heat exchanger 23a of the low temperature side heating section 21a of the combustion type heat source equipment 20 are connected to the air conditioners 2 and 3 through the heat medium circuit 40, respectively. connected in parallel. The heat medium circuit 40 is arranged between the heat medium side heat exchanger 12 of the heat pump 11 and each of the air conditioners 2 and 3 without passing the heat medium through the first heat exchanger 23a of the low temperature side heating section 21a. and the first heat exchanger 23a of the low-temperature side heating unit 21a and each of the air conditioners 2 and 3, without passing the heat medium through the heat medium side heat exchanger 12 of the heat pump 11. It is configured to have a flow path that can be circulated to.

Specifically, the heat medium circuit 40 serves as a flow path for sending out the heat medium from the heat medium side heat exchanger 12 at the downstream end of the heat medium side heat exchanger 12 (the flow path of the heat medium in the heat medium side heat exchanger 12). A first outward path 41a connected to the downstream end of the flow path) and an upstream end of the heat medium side heat exchanger 12 (heat medium side heat exchanger 12) as a flow path for returning the heat medium to the heat medium side heat exchanger 12 12), and the downstream end of the first heat exchanger 23a as a flow path for sending out the heat medium from the first heat exchanger 23a (the first heat A second outbound path 42a connected to the heat medium flow path downstream end of the heat exchanger 23a, and an upstream end of the first heat exchanger 23a as a flow path for returning the heat medium to the first heat exchanger 23a (second A second return path 42b connected to the upstream end of the flow path of the heat medium in the 1 heat exchanger 23a, and the upstream of each of the air conditioners 2 and 3 as a flow path for supplying the heat medium to each of the air conditioners 2 and 3 The heat medium supply path 43a connected to the end (the upstream end of the heat medium flow path in each of the air conditioners 2 and 3), and the air conditioners 2 and 3 serving as flow paths for discharging the heat medium from each of the air conditioners 2 and 3. 3 (downstream ends of the heat medium flow paths in each of the air conditioners 2 and 3).

In this case, the heat medium supply path 43a and the heat medium discharge path 43b are common flow paths for the air conditioners 2 and 3, respectively. It is connected in parallel with the discharge path 43b. The first outward path 41a and the second outward path 42a are connected to the heat medium supply path 43a so as to merge with the heat medium supply path 43a. It is connected to the heat medium discharge path 43b so as to branch. A check valve 49 is attached to the second outward path 42a.

Since the heat medium circuit 40 is configured as described above, the heat medium is transferred between the heat medium side heat exchanger 12 of the heat pump 11 and each of the air conditioners 2 and 3 to the first heat medium of the low temperature side heating section 21a. A flow path that allows circulation without passing through the heat exchanger 23a is constituted by the first outward path 41a, the heat medium supply path 43a, the heat medium discharge path 43b, and the first return path 41b. In addition, a flow path that allows the heat medium to circulate between the first heat exchanger 23a of the low temperature side heating unit 21a and each of the air conditioners 2 and 3 without passing through the heat medium side heat exchanger 12 of the heat pump 11. is composed of a second outward path 42a, a heat medium supply path 43a, a heat medium discharge path 43b, and a second return path 42b.

Supplementally, the low-temperature side heating unit 21a includes a bypass passage through which the heat medium flows from the second return passage 42b to the second outward passage 42a by bypassing the first heat exchanger 23a, and a flow rate of the heat medium in the bypass passage and the first heat. A control valve may be provided for adjusting the ratio with the flow rate of the heat medium in the exchanger 23a.

In addition, although one heating air conditioner 2 and one cooling and heating air conditioner 3 are shown in FIG. 1, the air conditioning system 1 includes a plurality of heating air conditioners and a plurality of cooling and heating air conditioners. may In that case, a plurality of heating air conditioners or a plurality of cooling and heating air-heating air conditioners are connected in parallel between the heat medium supply path 43a and the heat medium discharge path 43b.

Although not shown, each of the air conditioners 2 and 3 is provided with an on-off valve such as a thermal valve that opens and closes the flow path of the heat medium in each. The heat medium can flow from the medium supply path 43a side to the heat medium discharge path 43b side, and the flow of the heat medium is blocked when the on-off valve is controlled to be closed. The open/close valve of each air conditioner 2 or 3 is controlled to open when the air conditioner 2 or 3 is in operation.

The heat medium circuit 40 further includes a bypass path 44 connected between the first outward path 41a and the first return path 41b so as to branch from the middle part of the first outward path 41a and join the middle part of the first return path 41b. , a channel switching device 45 for switching channels, and two electric pumps 46 and 47 as power sources for flowing the heat medium.

In this embodiment, the flow path switching device 45 is a branching portion from the heat medium discharge path 43b to the first return path 41b and the second return path 42b (the connection between the heat medium discharge path 43b and the first return path 41b and the second return path 42b). part) and a second switching valve 45b assembled to the connecting portion between the first return path 41b and the bypass path 44. Note that FIG. 1 shows the first switching valve 45a and the second switching valve 45b as devices external to the heat pump unit 10 and the combustion heat source device 20, but these are not the heat pump unit 10 or the combustion heat source device 20. may be installed in

The first switching valve 45a is composed of, for example, an electric three-way valve, and by controlling the operation thereof, the first switch valve 45a opens the heat medium discharge passage 43b to the first return passage 41b and blocks the second return passage 42b. an operation state, a second operation state in which the heat medium discharge path 43b is opened to the second return path 42b and blocked from the first return path 41b, and a heat medium discharge path 43b that is connected to both the first return path 41b and the second return path 42b. selectively operable to a third operating state to open the

In this case, in the first operating state of the first switching valve 45a, in other words, the heat medium is transferred between the heat medium side heat exchanger 12 of the heat pump 11 and each of the air conditioners 2 and 3 to the low temperature side heating section. This is an operating state in which a flow path is formed that allows circulation without passing through the first heat exchanger 23a of 21a. In other words, in the second operating state of the first switching valve 45a, the heat medium is transferred to the heat pump 11 between the first heat exchanger 23a of the low temperature side heating section 21a and each of the air conditioners 2 and 3. This is an operating state in which a flow path is formed that allows circulation without passing through the heat medium side heat exchanger 12 . In other words, the third operating state of the first switching valve 45a is both the heat medium side heat exchanger 12 of the heat pump 11 and the first heat exchanger 23a of the low temperature side heating section 21a and the air conditioners 2 and 3. is an operating state in which a flow path for circulating a heat medium is formed between each of

The second switching valve 45b is composed of, for example, an electric three-way valve, and by controlling its operation, the bypass passage 44 is blocked from the first return passage 41b, and the second switching valve 45b on the upstream side of the second switching valve 45b is closed. A operation state in which the first return line 41b is opened to the first return line 41b on the downstream side, and a bypass line 44 is opened to the first return line 41b on the downstream side of the second switching valve 45b, and on the upstream side of the second switching valve 45b. and a B-operation state in which the first return path 41b of the first return path 41b is cut off from the first return path 41b on the downstream side.

In this case, the second switching valve 45b is in the A state of operation, in other words, the heat medium sent from the heat medium side heat exchanger 12 of the heat pump 11 does not pass through the bypass passage 44, and the air conditioner 2, 3, the operating state that can be returned to the heat medium side heat exchanger 12 via each of 3, the Bth operating state, in other words, the total amount of heat medium sent from the heat medium side heat exchanger 12 of the heat pump 11 is allowed to flow back to the heat medium side heat exchanger 12 via the bypass 44 .

Supplementally, in the present embodiment, the first switching valve 45a is provided at the branch portion from the heating medium discharge path 43b to the first return path 41b and the second return path 42b. A switching valve composed of a three-way valve or the like is provided at the junction of the first outward path 41a and the second outward path 42a to the heat medium supply path 43a, and the first operating state and the second operating state are controlled by the operation control of the switching valve. , and the third operating state. Alternatively, for example, an on-off valve or a flow control valve is attached to each of the first outbound route 41a and the second outbound route 42a, or to each of the first return route 41b and the second return route 42b, and these on-off valves or flow control valves It is also possible to realize operating states equivalent to each of the first operating state, the second operating state, and the third operating state by performing the opening/closing control of .

Further, instead of the second switching valve 45b, for example, a switching valve composed of a three-way valve or the like is provided at the connection portion between the first outward passage 41a and the bypass passage 44, and the operation control of the switching valve controls the above-mentioned first A It is also possible to realize operating states equivalent to each of the operating state and the Bth operating state. Alternatively, for example, in each of the bypass channel 44 and the flow channel downstream of the connection portion with the bypass channel 44 in the first outward channel 41a, or the bypass channel 44 and the bypass in the first return channel 41b By assembling an on-off valve or a flow rate control valve to each of the flow paths on the upstream side of the connecting portion with the path 44 and performing opening/closing control of these on-off valves or flow rate control valves, the above-mentioned A operating state and It is also possible to implement operating states equivalent to each of the B operating states.

A pump 46 (hereinafter sometimes referred to as a first pump 46 ) is provided in the heat pump unit 10 as a power source for causing the heat medium to flow through the heat medium circuit 40 passing through the heat medium side heat exchanger 12 of the heat pump 11 . It is a mounted pump, and is assembled to one of the first outward path 41a and the first return path 41b, for example, the first outward path 41a. By the operation of the first pump 46, the heat medium flows from the heat medium side heat exchanger 12 to the first outward passage 41a, the heat medium supply passage 43a, the air conditioners 2 and 3, respectively, the heat medium discharge passage 43b, and the first return passage 41b. It is possible to circulate the heat medium so as to flow back to the heat medium side heat exchanger 12 through sequentially.

The pump 47 (hereinafter sometimes referred to as the second pump 47) is a combustion type power source for causing the heat medium to flow in the heat medium circuit 40 through the first heat exchanger 23a of the low temperature side heating section 21a. It is a pump mounted on the heat source device 20, and is attached to one of the second outward passage 42a and the second return passage 42b, for example, the second outward passage 42a. By the operation of the second pump 47, the heat medium flows from the first heat exchanger 23a through the second outward passage 42a, the heat medium supply passage 43a, the air conditioners 2 and 3, respectively, the heat medium discharge passage 43b, and the second return passage 42b. It is possible to circulate the heat medium so as to flow back through the first heat exchanger 23a in turn.

A temperature sensor for detecting the temperature of the heat medium is assembled in the heat medium circuit 40 . In this embodiment, for example, a temperature sensor 48a that detects the temperature of the heat medium supplied from the heat pump unit 10 to the heat medium supply path 43a, A temperature sensor 48b for detecting the temperature of the heat medium supplied, a temperature sensor 48c for detecting the temperature of the heat medium supplied to the air conditioners 2 and 3, and a temperature sensor 48c for detecting the temperature of the heat medium discharged from the air conditioners 2 and 3. A temperature sensor 48d for detecting is assembled in each of the first outward path 41a, the second outward path 42a, the heat medium supply path 43a, and the heat medium discharge path 43b.

Next, referring to FIG. 2, the air conditioning system 1 further includes a control device 60 for controlling the operation of the air conditioning system 1 and a remote controller 70 for the user to operate the air conditioning system 1. . The control device 60 is composed of 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, and the like.

For example, the control device 60 is mounted on each of the heating air conditioner 2, the cooling and heating air conditioner 3, the bathroom heater 4, the heat pump unit 10, the combustion heat source device 20, and the flow path switching device 45, and communicates with each other. It can be configured as an assembly of a plurality of electronic circuit units that can execute operational control of the air conditioning system 1 in cooperation with each other. In this case, one of the electronic circuit units is a high-level control device that supervises the entire operation of the air conditioning system 1, and the other electronic circuit units are the heating air conditioner 2, the cooling and heating air conditioner 3, the heat pump unit 10, the combustion type An assembly of electronic circuit units may be configured to function as a control device that locally controls the operation of each of the heat source device 20 and the flow path switching device 45 .

Sensing signals (detection signals) of a plurality of sensors such as the temperature sensors 34, 48a to 48d provided in the air conditioning system 1 are input to the control device 60. FIG. Also, the control device 60 can communicate with the remote controller 70 by wire or wirelessly. Through this communication, the control device 60 receives command information regarding the operation of the heating air conditioner 2, the cooling and heating air conditioner 3, and the bathroom heater 4 from the remote controller 70, and transmits various notification information to the remote controller 70. can be output as

In addition, the air conditioning system 1 may be provided with not only one remote controller 70 but also a plurality of remote controllers. For example, the air conditioning system 1 may be provided with separate remote controllers for each of the heating air conditioner 2 , the cooling and heating air conditioner 3 , and the bathroom heater 4 .

The control device 60 includes, as functions realized by the implemented hardware configuration and programs (software configuration), an air conditioning operation control unit 61 that executes control processing related to the operation of the air conditioners 2 and 3; and a bathroom operation control unit 62 that executes control processing related to the operation of the device 4 .

In this case, the elements to be controlled by the air-conditioning operation control unit 61 include the first pump 46 of the heat pump unit 10, the compressor (not shown) of the refrigerant circuit 13, the low-temperature side heating unit 21a of the combustion heat source device 20, and the second pump 47. , a first switching valve 45a and a second switching valve 45b of the flow path switching device 45, and an on-off valve (not shown) for opening and closing the heat medium flow paths of the air conditioners 2 and 3, respectively. More specifically, the operation control of the low temperature side heating unit 21a is performed through the operation control of the on-off valves 27 and 28a and the fuel adjustment valve 29a of the fuel supply device 24 and the ignition device (not shown).

Elements to be controlled by the bathroom operation control unit 62 include the high-temperature side heating unit 21b of the combustion heat source device 20, the pump 32, the on-off valve 33, and the blower fan and air passage (not shown) mounted in the bathroom heater 4. a switching device. More specifically, the operation control of the high temperature side heating section 21b is performed through the operation control of the on-off valves 27, 28b and the fuel adjustment valve 29b of the fuel supply device 24 and the ignition device (not shown).
Supplementally, the air conditioning operation control section 61 has a function as a control section in the present invention, and also includes a function as a required heat quantity determination section in the present invention.

Next, the operation of the air conditioning system 1 of this embodiment will be described. First, the cooling operation of the cooling/heating air conditioner 3 will be described. When the remote controller 70 instructs the cooling/heating air conditioner 3 to perform the cooling operation, the control device 60 causes the air conditioning operation control unit 61 to set the first switching valve 45a of the flow path switching device 45 to the first operation state. Also, the second switching valve 45b is controlled to the Ath operating state. As a result, the heat medium discharge path 43b of the heat medium circuit 40 is opened to the heat medium side heat exchanger 12 of the heat pump 11 via the first return path 41b, and the heat in the second return path 42b and the bypass 44 is released. The flow of the medium is cut off.

In this state, the air-conditioning operation control unit 61 controls the opening and closing valve (not shown) of the heat medium flow path of the cooling/heating air conditioner 3 and further operates the first pump 46 . At the same time, the air-conditioning operation control unit 61 causes the heat medium side heat exchanger 12 of the heat pump 11 to flow the refrigerant to the heat medium side heat exchanger 12 via a compressor (not shown), an outside air side heat exchanger, and an expansion mechanism in this order. The heat pump 11 is operated so as to cause reflux. The number of revolutions of the first pump 46 and the number of revolutions of the compressor (not shown) of the heat pump 11 are controlled according to the temperature of the indoor space set by the remote control 70, for example.

As a result, between the heat medium side heat exchanger 12 of the heat pump 11 and the cooling/heating air conditioner 3, the heat is transferred through the first outward path 41a, the heat medium supply path 43a, the heat medium discharge path 43b, and the first return path 41b. While the medium circulates, the heat medium is cooled by heat exchange with the refrigerant in the heat medium side heat exchanger 12 (radiation of heat from the heat medium to the refrigerant). Further, the heat medium absorbs heat from the air in the indoor space through heat exchange with the air in the indoor space in the air conditioner 3 for cooling and heating. Thereby, the indoor space in which the air conditioner 3 for cooling and heating is arranged is cooled.

Next, the heating operation of the air conditioners 2 and 3 (one or both of the heating air conditioner 2 and the cooling/heating air conditioner 3) will be described. In the present embodiment, as the heating operation modes of the air conditioners 2 and 3, the first heating operation mode in which the heat medium is heated by the heat pump 11 and the heat medium is heated by the low temperature side heating section 21a of the combustion heat source device 20. There are a second heating operation mode and a third heating operation mode in which the heat medium is heated by both the heat pump 11 and the low temperature side heating unit 21a. Then, the control device 60 causes the air conditioners 2 and 3 to perform the heating operation in one of the first to third heating operation modes.

In this case, which of the first to third heating operation modes is used to perform the heating operation of the air conditioners 2 and 3 depends on the cost of using electric power as the energy source of the heat pump 11 and the energy source of the low temperature side heating unit 21a. It can be determined by reflecting various conditions such as the fuel utilization cost, the user's desire, the load of the air conditioners 2 and 3, and the like.

For example, the control device 60 gives priority to performing the heating operation of the air conditioners 2 and 3 in the first heating operation mode in a time period when the power usage cost is lower than the fuel usage cost. When the load on the air conditioner becomes large, it is possible to supplementarily perform the heating operation in the third heating operation mode. Further, the control device 60 gives priority to performing the heating operation of the air conditioners 2 and 3 in the second heating operation mode, for example, in a time period in which the cost of using electric power is higher than the cost of using fuel. , 3, the heating operation of the air conditioners 2, 3 can be supplementarily performed in the third heating operation mode.

Further, the control device 60 can cause the air conditioners 2 and 3 to perform the heating operation in a mode designated by the user with the remote controller 70, for example, among the first to third heating operations. In this manner, in which of the first to third heating modes the air conditioners 2 and 3 are to be operated can be determined according to various conditions.

In the first heating operation mode, the control device 60 causes the air conditioning operation control unit 61 to control the first switching valve 45a of the flow path switching device 45 to the first operation state, as in the case of the cooling operation. The second switching valve 45b is controlled to the Ath operating state. In this state, the air conditioning operation control unit 61 controls opening and closing valves (not shown) of the flow paths of the heat medium of the air conditioners 2 and 3 that are to be subjected to the heating operation. activate. In addition, the air conditioning operation control unit 61 causes the refrigerant of the heat pump 11 to flow from the heat medium side heat exchanger 12 to the heat medium side heat exchanger 12 through an expansion mechanism (not shown), an outside air heat exchanger, and a compressor in this order. The heat pump 11 is operated so as to circulate to . The number of revolutions of the first pump 46 and the number of revolutions of the compressor (not shown) of the heat pump 11 are controlled according to the temperature of the indoor space set by the remote control 70, for example.

As a result, the first outward path 41a, the heat medium supply path 43a, the heat medium discharge path 43b, and the first return path 41b are connected between the heat medium side heat exchanger 12 of the heat pump 11 and the air conditioners 2 and 3 that are to be subjected to heating operation. While the heat medium circulates through the heat medium side heat exchanger 12, the heat medium is heated by heat exchange with the refrigerant (radiation from the refrigerant to the heat medium). Further, the heat medium radiates heat to the air in the indoor space through heat exchange with the air in the indoor space in the air conditioners 2 and 3 that are the objects of the heating operation. As a result, the indoor space in which the air conditioners 2 and 3 for heating operation are arranged is heated.

In the second heating operation mode, the control device 60 causes the air conditioning operation control section 61 to control the first switching valve 45a of the flow path switching device 45 to the second operation state, and the second switching valve 45b to the second operating state. Control to A operating state. As a result, the heat medium discharge path 43b of the heat medium circuit 40 is opened to the first heat exchanger 23a of the low-temperature side heating unit 21a through the second return path 42b, and the first return path 41b and the bypass path 44 The flow of the heat medium is cut off.

In this state, the air-conditioning operation control unit 61 controls opening and closing valves (not shown) of the heat medium flow paths of the air conditioners 2 and 3 that are to be subjected to the heating operation, and further operates the second pump 47. . At the same time, the air conditioning operation control section 61 starts the combustion operation of the first burner 22a of the low temperature side heating section 21a. The number of revolutions of the second pump 47 and the amount of combustion of the first burner 22a are controlled according to the temperature of the indoor space set by the remote controller 70, for example.

As a result, the second outbound path 42a and the heat medium supply path 43a, the heat medium discharge path 43b and the second heat medium discharge path 43b are connected between the first heat exchanger 23a of the low temperature side heating unit 21a and the air conditioners 2 and 3 that are to be subjected to heating operation. While the heat medium circulates through the return path 42b, the heat medium is heated by the combustion heat of the first burner 22a in the first heat exchanger 23a. Further, the heat medium radiates heat to the air in the indoor space through heat exchange with the air in the indoor space in the air conditioners 2 and 3 that are the objects of the heating operation. As a result, the indoor space in which the air conditioners 2 and 3 for heating operation are arranged is heated.

In the third heating operation mode, the control device 60 causes the air conditioning operation control section 61 to control the first switching valve 45a of the flow path switching device 45 to the third operating state, and the second switching valve 45b to the third operating state. Control to A operating state. As a result, the heat medium discharge path 43b of the heat medium circuit 40 is opened to the heat medium side heat exchanger 12 of the heat pump 11 via the first return path 41b, and the low temperature side heating section is opened via the second return path 42b. 21a is opened to the first heat exchanger 23a. Also, the flow of the heat medium in the bypass 44 is blocked.

In this state, the air conditioning operation control unit 61 controls the opening and closing valves (not shown) of the flow paths of the heat medium of the air conditioners 2 and 3 that are to be subjected to the heating operation. Both pumps 47 are activated. In addition, the air conditioning operation control unit 61 causes the refrigerant of the heat pump 11 to flow from the heat medium side heat exchanger 12 to the heat medium side heat exchanger 12 through an expansion mechanism (not shown), an outside air heat exchanger, and a compressor in this order. The heat pump 11 is operated so as to circulate to , and the combustion operation of the first burner 22a of the low temperature side heating section 21a is started. The rotation speed of each of the first pump 46 and the second pump 47, the rotation speed of the compressor (not shown) of the heat pump 11, and the combustion amount of the first burner 22a are determined by the temperature of the indoor space set by the remote controller 70, for example. It is controlled according to the elevation state and the like.

As a result, the first outward path 41a, the heat medium supply path 43a, the heat medium discharge path 43b, and the first return path 41b are connected between the heat medium side heat exchanger 12 of the heat pump 11 and the air conditioners 2 and 3 that are to be subjected to heating operation. While the heat medium circulates through the heat medium side heat exchanger 12, the heat medium is heated by heat exchange with the refrigerant (radiation from the refrigerant to the heat medium). At the same time, between the first heat exchanger 23a of the low temperature side heating unit 21a and the air conditioners 2 and 3 that are to be subjected to heating operation, the second outward path 42a and the heat medium supply path 43a, the heat medium discharge path 43b and the second While the heat medium circulates through the return path 42b, the heat medium is heated by the combustion heat of the first burner 22a in the first heat exchanger 23a. Then, the heat medium radiates heat to the air in the indoor space through heat exchange with the air in the indoor space in the air conditioners 2 and 3 that are the objects of heating operation. As a result, the indoor space in which the air conditioners 2 and 3 for heating operation are arranged is heated.

In this case, the flow rate of the heat medium passing through the heat medium side heat exchanger 12 of the heat pump 11 and the flow rate of the heat medium passing through the first heat exchanger 23a of the low temperature side heating section 21a are Each of the two pumps 47 can be adjusted separately. Therefore, the flow rate of the heat medium supplied to the air conditioners 2 and 3 from the heat pump 11 and the low temperature side heating unit 21a can be appropriately changed according to changes in the amount of heat required by the air conditioners 2 and 3. .
In this embodiment, the heating operation of the air conditioners 2 and 3 in each of the first to third heating operation modes is performed as described above.

In this case, in the first heating operation mode, the heat medium does not flow through the first heat exchanger 23a of the low-temperature side heating unit 21a, the second return path 42b, and the second outward path 42a, so heat radiation loss and pressure loss can be reduced. . Similarly, in the second heating operation mode, the heat medium does not flow through the heat medium side heat exchanger 12 of the heat pump 11, the first return path 41b, and the first outward path 41a, so heat loss and pressure loss can be reduced.

Next, the operation when the heating operation of the air conditioners 2 and 3 is shifted from the first heating operation mode to the third heating operation mode will be described. For example, during the heating operation in the first heating operation mode, when the user operates the remote control 70 to increase the temperature of the indoor space, the required heat amount of the air conditioners 2 and 3 for the heating operation (heating operation target Since the required amount of heat supplied to the air conditioners 2 and 3 per unit time) increases, the output of the heat pump 11 (heating amount of the heat medium) is insufficient for the required amount of heat, and the first heating operation mode to the mode of the third heating operation.

In this case, in the present embodiment, the control device 60 controls the heating amount of the heat medium by the heat pump 11 in the first heating operation mode immediately before the mode transition (the output of the heat pump 11) and the rotation speed of the first pump 46 ( As a result, the heat pump 11 and the first pump 46, and the first burner of the low temperature side heating unit 21a are operated so as to shift to the third heating operation mode while maintaining the flow rate of the heat medium by the first pump 46. 22a and the second pump 47 are controlled.

Specifically, the air-conditioning operation control unit 61 of the control device 60 sets the required heat amount of the air conditioners 2 and 3 for heating operation to the temperature of the indoor space set by the remote control 70 before and after the mode transition. , depending on the high or low state. The required amount of heat is set to increase as the required indoor space temperature increases.

In the present embodiment, in the first heating operation mode, when the required heat amount of the air conditioners 2 and 3 is equal to or less than the predetermined upper limit output of the heat pump 11, the output Qhp1 of the heat pump 11 (per unit time heating amount of the heat medium) and the flow rate Fhp1 of the heat medium by the first pump 46 are controlled based on the following equation (1).

Qhp1=Qr1=(Bti-Bto)・Fhp1 ……(1)

Here, Qr1 is the amount of heat required by the air conditioners 2 and 3 in the first heating operation mode, Bti is the target temperature of the heat medium supplied to the air conditioners 2 and 3 (for example, 60° C.), and Bto is the air conditioner. 2 and 3 (the temperature detected by the temperature sensor 48d).

Therefore, the output Qhp1 of the heat pump 11 is controlled to match the required heat quantity Qr1 of the air conditioners 2 and 3, and the flow rate Fhp1 of the heat medium by the first pump 46 is the required heat quantity Qr1, which is the temperature difference (Bti-Bto). (In other words, the heat pump 11 can raise the temperature of the heat medium discharged from the air conditioners 2 and 3 from Bto to Bti). The output of the heat pump 11 is adjusted through control of the rotation speed of the compressor (not shown) of the refrigerant circuit 13, and the flow rate of the heat medium by the first pump 46 is adjusted through control of the rotation speed of the first pump 46. .

When the required heat quantity of the air conditioners 2 and 3 exceeds the predetermined upper limit output of the heat pump 11, the required heat quantity cannot be satisfied by the output of the heat pump 11 in the first heating operation. shifts the heating operation mode from the first heating operation mode to the third heating operation mode. In this case, the air conditioning operation control unit 61 changes the output Qhp2 of the heat pump 11 after the mode shift and the flow rate Fhp2 of the heat medium by the first pump 46 to the mode The output Qhp1 and the flow rate Fhp1 before the shift are maintained respectively.

Qhp2=Qhp1 ……(2a)
Fhp2=Fhp1 ……(2b)

Further, the air-conditioning operation control unit 61 controls the heating amount Qg2 of the heat medium by the first burner 22a after the mode shift and the flow rate Fg2 of the heat medium by the second pump 47, respectively, based on the following equation (3). .

Qg2=Qr2-Qhp2=(Bti-Bto)・Fg2 ……(3)

Here, Qr2 is the required heat amount of the air conditioners 2 and 3 after the mode shift. Therefore, the heating amount Qg2 of the heat medium by the first burner 22a after the mode shift is calculated from the required heat amount Qr2 of the air conditioners 2 and 3 after the mode shift, and the output Qhp2 of the heat pump 11 (=the required heat amount immediately before the mode shift). Qr1) is subtracted. Further, the flow rate Fg2 of the heat medium by the second pump 47 is adjusted so as to match the value obtained by dividing the heating amount Qg2 of the heat medium by the first burner 22a by the temperature difference (Bti-Bto) (in other words, the air conditioner 2 and 3, the heat medium flowing through the second return path 42b to the low temperature side heating part 21a can be heated from Bto to Bti by the combustion operation of the first burner 22a). be done. The heating amount Qg2 of the heating medium by the first burner 22a is adjusted by controlling the amount of fuel gas supplied to the first burner 22a, and the flow rate of the heating medium by the second pump 47 is determined by the rotation of the second pump 47. Adjusted through number control.

As an example of specific numerical values, for example, the required heat amount of the air conditioners 2 and 3 before the mode shift is 3 kW, the required heat amount of the air conditioners 2 and 3 after the mode shift is 5 kW, and the air conditioners 2 and 3 When the target temperature of the heat medium supplied is, for example, 60° C., and the temperature of the heat medium discharged from the air conditioners 2 and 3 is, for example, 40° C., the output Qhp1 of the heat pump 11 before mode transition and the first pump 46 The flow rate Fhp1 of the heat medium is Qhp1=3 kW=43 kcal/min and Fhp1=2.15 liter/min=2150 cm ³ /min. Also, the output Qhp2 of the heat pump 11 after the mode shift, the flow rate Fhp2 of the heat medium by the first pump 46, the heating amount Qg2 of the heat medium by the first burner 22a, and the flow rate Fg2 of the heat medium by the second pump 47 Qhp2 = 3 kW = 43 kcal/min, Fhp2 = 2.15 liters/min = 2150 cm 3 /min, Qg2 = 2 ^kW = 28.67 kcal/min, Fg2 = 1.43 liters/min = 1430 cm ³ /min becomes.

In the numerical example above, the temperature of the heat medium discharged from the air conditioners 2 and 3 is constant before and after the mode transition. However, the heating amount Qg2 of the heat medium by the first burner 22a after the mode shift and the flow rate Fg2 of the heat medium by the second pump 47 can be calculated based on the above equation (3).

In the present embodiment, when the heating operation mode shifts from the first heating operation mode to the third heating operation mode, the heat pump 11, the first pump 46, the low-temperature side heating unit 21a, and the second pump are operated as described above. 47, the operating states of the heat pump 11 and the first pump 46 can be kept constant before and after the mode transition. Therefore, the heating operation mode is set to the first heating operation mode so that the stability of the heating state of the heat medium by the heat pump 11 is enhanced, and the fluctuation of the temperature supplied to the air conditioners 2 and 3 can be suppressed as much as possible. to the third heating operation mode.

Next, the operation when the anti-freezing operation of the heat pump unit 10 is performed during the heating operation of the air conditioners 2 and 3 in the second heating operation mode will be described. In the second heating operation mode, the heat pump 11 is not in operation and the heat pump unit 10 is installed outdoors. ), the first outward path 41a and the first return path 41b may freeze. Therefore, the heat pump unit 10 performs anti-freezing operation to prevent freezing of each part. When the anti-freezing operation of the heat pump unit 10 is executed, the air conditioning operation control section 61 of the control device 60 maintains the heating operation of the air conditioners 2 and 3 in the second heating operation mode. At the same time, the air-conditioning operation control unit 61 switches and controls the second switching valve 45b from the A operation state to the B operation state. As a result, the first outward route 41a is opened to the first return route 41b via the bypass route 44. As shown in FIG.

In this state, the air conditioning operation control section 61 operates the first pump 46 . As a result, the heat medium circulates through the heat medium side heat exchanger 12, the first outward passage 41a, the bypass passage 44, and the first return passage 41b, and freezing of various parts of the heat pump unit 10 is prevented. When the outside air temperature drops to such an extent that freezing cannot be prevented only by circulating the heat medium, the heat pump 11 is operated to heat the refrigerant in the refrigerant circuit 13 and supply the heated refrigerant to the heat medium side heat exchanger 12. heats the heat medium circulating through the heat medium side heat exchanger 12, the first outward passage 41a, the bypass passage 44, and the first return passage 41b.

In this case, the heat medium flowing through the heat medium side heat exchanger 12 flows back to the heat medium side heat exchanger 12 via the first outward passage 41a, the bypass passage 44, and the first return passage 41b. The supply to the air conditioners 2, 3 is blocked.

Note that this anti-freezing operation can be executed even when the air conditioning units 2 and 3 are not in the heating operation. In this case, the air conditioning operation control unit 61 does not need to change the state of the first switching valve 45a, and controls the switching of the second switching valve 45b from the A operating state to the B operating state to operate the first pump 46. At the same time, the heat pump 11 may be operated as necessary to heat the refrigerant in the refrigerant circuit 13 and supply the heated refrigerant to the heat medium side heat exchanger 12 .

Next, the heating operation (or drying operation) of the bathroom heater 4 will be described. When the execution of the heating operation (or the drying operation) of the bathroom heating device 4 is instructed by the remote control 70 , the control device 60 controls the operation of the bathroom heating device 4 by the bathroom operation control unit 62 . Specifically, the bathroom operation control unit 62 controls the opening of the on-off valve 33 of the circulation path 31 and operates the pump 32 . In this state, the bathroom operation control section 62 starts the combustion operation of the second burner 22b of the high temperature side heating section 21b. The amount of combustion of the second burner 22b is controlled so that the temperature of the heat medium supplied to the bathroom heater 4 (the temperature detected by the temperature sensor 34) reaches a predetermined target temperature (e.g., 80°C). .

As a result, while the heat medium circulates through the circulation path 31 between the second heat exchanger 23b of the high temperature side heating unit 21b and the bathroom heater 4, the combustion operation of the second burner 22b heats the second heat exchanger. 23 b , and the heated heat medium is supplied to the bathroom heater 4 . Then, the bathroom operation control unit 62 controls the blower fan (not shown) of the bathroom heater 4 to blow warm air heated by the heat medium supplied to the bathroom heater 4 into the bathroom.

In this case, in this embodiment, since the circulation path 31 for flowing the heat medium for the bathroom heater 4 is a flow path independent (separated) from the heat medium circuit 40, the high temperature supplied to the bathroom heater 4 No heat medium flows into the heat medium circuit 40 . Therefore, even when the heating operation of the heating air conditioner 2 or the cooling and heating air conditioner 3 is being performed, or when the cooling operation of the cooling and heating air conditioner 3 is being performed, the air conditioner The heating operation (or the drying operation) of the bathroom heating device 4 can be performed without affecting the operational states of 2 and 3.

[Second embodiment]
Next, a second embodiment of the invention will be described with reference to FIG. Note that the air conditioning system 1' of this embodiment differs from the air conditioning system 1 of the first embodiment only in a part of the configuration, so the description of the same items as those of the first embodiment will be omitted.

In the first embodiment, the circulation path 31, which is the heat medium flow path for the bathroom heater 4, is configured as a flow path independent (separated) from the heat medium circuit 40 for the air conditioners 2 and 3. In the air conditioning system 1' of the embodiment, for example, as shown in FIG. It is

This air conditioning system 1' differs from the first embodiment in the configuration of the return path 31c of the circulation path 31'. Specifically, the return path 31c merges with the second return path 42b of the heat medium circuit 40 downstream of the second pump 47 from the bathroom heater 4, and further flows from the second return path 42b downstream of the second pump 47. It branches and is configured to reach the second heat exchanger 23b of the high temperature side heating section 21b.

Therefore, in the second return path 42b of the heat medium circuit 40, the flow path (flow path including the second pump 47) between the junction and the branch of the return path 31c on the side of the bathroom heater 4 is the air conditioner 2, 3 to return the heat medium to the first heat exchanger 23a of the low temperature side heating unit 21a, and a flow path to return the heat medium from the bathroom heater 4 to the second heat exchanger 23b of the high temperature side heating unit 21b. It is a flow path that also has the function of

In addition, in the present embodiment, the second pump 47 functions as a power source for circulating the heat medium between the air conditioners 2 and 3 and the first heat exchanger 23a of the low-temperature side heating section 21a. It also has a function as a power source for circulating the heat medium between the heating device 4 and the second heat exchanger 23b of the high temperature side heating section 21b. Therefore, the circulation path 31' is not equipped with a dedicated pump.

The air conditioning system 1' of this embodiment is the same as that of the first embodiment except for the matters described above. In this air conditioning system 1', the cooling operation of the cooling/heating air conditioner 3 and the heating operation of the air conditioners 2 and 3 are performed in the same manner as in the first embodiment.

Further, during the heating operation (or during the drying operation) of the bathroom heater 4, the opening of the on-off valve 33 of the circulation path 31' is controlled, and the second pump 47 is operated. Combustion operation of the second burner 22b is performed. In this case, as in the first embodiment, the combustion amount of the second burner 22b is controlled so that the temperature of the heat medium supplied to the bathroom heater 4 reaches a predetermined target temperature (eg, 80° C.).

During the heating operation (or during the drying operation) of the bathroom heating device 4, the heat medium after heat dissipation in the bathroom heating device 4 flows into the second return path 42b of the heat medium circuit 40, but the high temperature side heating unit 21b The high-temperature heat medium supplied from the second heat exchanger 23 b to the bathroom heater 4 does not flow into the heat medium circuit 40 . For this reason, even when the heating operation of the heating air conditioner 2 or the cooling and heating air conditioner 3 is being performed, or when the cooling operation of the cooling and heating air conditioner 3 is being performed, the air conditioning The heating operation (or drying operation) of the bathroom heating device 4 can be performed without affecting the operating conditions of the devices 2 and 3 .

In addition, the present invention is not limited to the first embodiment or the second embodiment described above, and other embodiments can be adopted. For example, the air conditioning systems 1 and 1' have the combustion type heat source machine 20 as the second heat source, but the air conditioning system of the present invention has, for example, an electric heat source machine instead of the combustion type heat source machine 20. may Further, the air conditioning system of the present invention may be a system that does not include a heat dissipation device such as the bathroom heater 4 or the like. In this case, the high temperature side heating section 21b and the circulation paths 31, 31' can be omitted.

Further, in each of the above-described embodiments, the bathroom heater 4 was exemplified as a heat dissipation device in the present invention, but the heat dissipation device is, for example, a heat exchanger or the like that radiates heat from a heated heat medium to hot water in a bathtub. may Moreover, in order to prevent the heat pump unit 10 from freezing, for example, a heater may be mounted on the heat pump unit 10 . In that case, the second switching valve 45b and the bypass passage 44 can be omitted.

Further, in each of the above-described embodiments, the first pump 46 for the channel passing through the heat medium side heat exchanger 12 of the heat pump 11 and the first pump 46 for the channel passing through the first heat exchanger 23a of the low temperature side heating unit 21a Although the second pump 47 is provided, instead of these pumps 46 and 47, for example, a pump may be provided in the heat medium supply path 43a or the heat medium discharge path 43b. However, when the first pump 46 and the second pump 47 are provided as in the last embodiment, even if one of the pumps 46 or 47 fails, the other of the heat pump 11 and the low temperature side heating section 21a The heating operation can be performed by supplying the heating medium heated by a pump corresponding to the pump 47 or 46 of 1 to the air conditioners 2 and 3 .

Further, in each of the above embodiments, the combustion type heat source device 20 includes the first burner 22a for heating the heat medium supplied to the air conditioners 2 and 3, and the heat medium supplied to the bathroom heater 4 (heat radiator). The second burner 22b for heating is separately provided, but for example, a common burner is provided for each, and the sensible heat generated by the combustion operation of the burner is transferred to the heat medium. and a latent heat type heat exchanger that transfers latent heat to the heat medium. Then, the heat medium heated by the sensible heat exchanger can be supplied to the bathroom heater 4 (heat radiator), and the heat medium heated by the latent heat exchanger is supplied to the air conditioners 2 and 3. A heat medium flow path may be configured to supply the heat medium.

DESCRIPTION OF SYMBOLS 1, 1'... Air conditioning system, 2, 3... Air conditioner, 4... Bathroom heater (radiator), 10... Heat pump unit (first heat source), 20... Combustion type heat source machine (second heat source), 21a... Low temperature Side heating part 21b... High temperature side heating part 31, 31'... Circulation path 40... Heat medium circuit 41a... First outward path 41b... First return path 42a... Second outward path 42b... Second return path 43a Heating medium supply path 43b Heating medium discharge path 45 Flow path switching device 45a, 45b Switching valve 46 First pump 47 Second pump 61 Air conditioning operation control unit (required heat amount determination unit , control).

Claims (5)

a first heat source capable of heating or cooling a heat medium;
a second heat source capable of heating the heat medium;
an air conditioner that air-conditions the indoor space by exchanging heat between the heat medium and the indoor space;
The first heat source and the second heat source are connected in parallel to the air conditioner so that the heat medium can be circulated between one or both of the first heat source and the second heat source and the air conditioner. a heat medium circuit;
One or more switching valves provided in the heat medium circuit form a flow path for circulating the heat medium between the first heat source and the air conditioner without passing through the second heat source. a first operating state; a second operating state in which a flow path is formed for circulating the heat medium between the second heat source and the air conditioner without passing through the first heat source; a channel switching device selectively operable in a third operating state forming a channel for circulation between both the first heat source and the second heat source and the air conditioner;
A cooling operation in which the heat medium is cooled by the first heat source while the heat medium is circulated between the first heat source and the air conditioner in a state in which the flow path switching device is operated in the first operating state. and heating the heat medium by the first heat source while circulating the heat medium between the first heat source and the air conditioner in a state in which the flow path switching device is operated in the first operating state. In a first heating operation and a state in which the flow path switching device is operated in the second operation state, the heat medium is circulated between the second heat source and the air conditioner while the heat medium is transferred to the second heat source. In a second heating operation in which heating is performed by a heat source, and in a state in which the flow path switching device is operated in the third operating state, the heat medium is supplied between both the first heat source and the second heat source and the air conditioner. an air conditioning system capable of executing a third heating operation in which the heat medium is heated by the first heat source and the second heat source while the heat medium is circulated. The air conditioning system of claim 1,
The heat medium circuit includes a first outward path connected to the first heat source so as to deliver the heat medium from the first heat source, and a first outward path connected to the first heat source so as to return the heat medium to the first heat source. a connected first return path, a second outward path connected to the second heat source so as to deliver the heat medium from the second heat source, and the second heat medium to return the heat medium to the second heat source It is connected to the first outward route and the second outward route so that the second return route connected to the heat source and the first outward route and the second outward route merge, and supplies the heat medium to the air conditioner. a heating medium supply path connected to the air conditioner; and a heat branched to the first return path and the second return path while being connected to the air conditioner so as to discharge the heat medium from the air conditioner an air conditioning system comprising a medium discharge path. In the air conditioning system according to claim 1 or 2,
The heat medium circuit includes a first pump provided in a flow path passing through only the first heat source of the first heat source and the second heat source in the heat medium circuit, and the first heat source and the second heat source. and a second pump provided in a flow path that passes through only the second heat source of the two heat sources. In the air conditioning system of claim 3,
a required heat amount determination unit that determines a required heat amount of the air conditioner according to a request for the temperature state of the indoor space; a control of the respective heating amounts of the first heat source and the second heat source; and a control unit that controls the operation of each of the two pumps,
During execution of the first heating operation, the control unit heats the first heat source when switching from the first heating operation to the third heating operation due to an increase in the amount of heat required by the air conditioner. The heating amount of the second heat source and the number of revolutions of the first pump are maintained in the same state as during the first heating operation, and the amount of heating of the second heat source and the number of revolutions of the first 2. An air conditioning system configured to control the rotation speed of two pumps. In the air conditioning system according to any one of claims 1 to 4,
The second heat source is a heating unit for heating the heat medium, and includes a low temperature side heating unit that heats the heat medium to a low temperature side temperature and a high temperature side heating unit that heats the heat medium to a high temperature side temperature. and
The heat medium circuit includes a flow path passing through the low temperature side heating unit as a flow path passing through the second heat source,
The high temperature side heating unit is connected to the heat dissipation device through a circulation path so as to circulate the heat medium between the heat dissipation device and the heat dissipation device that dissipates heat from the heat medium heated to the high temperature side temperature,
The air conditioning system according to claim 1, wherein the circulation path is configured so as not to allow the heat medium supplied from the high temperature side heating unit to the heat dissipation device to flow into the heat medium circuit.

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