WO2023181091A1

WO2023181091A1 - Air-conditioning/hot-water-supply system, and collective air-conditioning/hot-water-supply system

Info

Publication number: WO2023181091A1
Application number: PCT/JP2022/012942
Authority: WO
Inventors: 泰光野村; 慶郎青▲柳▼
Original assignee: 三菱電機株式会社
Priority date: 2022-03-22
Filing date: 2022-03-22
Publication date: 2023-09-28
Also published as: JPWO2023181091A1

Abstract

One embodiment of this air-conditioning/hot-water-supply system comprises heat supply equipment for supplying heat, and a plurality of air-conditioning/hot-water-supply equipment for receiving heat from the heat supply equipment, the heat supply equipment being provided with a first circulation circuit for circulating a first heat medium, and the air-conditioning/hot-water-supply equipment being provided with a second circulation circuit for circulating a second heat medium, a branch pipeline connected to the first circulation circuit, a heat pump for moving heat from the branch pipeline to the second circulation circuit, and a pressure-adjusting mechanism for adjusting the pressure of the first heat medium flowing through the interior of the branch pipeline to a prescribed pressure, the pressure-adjusting mechanism being provided to the branch pipeline.

Description

Air conditioning hot water system and collective air conditioning hot water system

The present disclosure relates to an air conditioning hot water supply system and a collective air conditioning hot water supply system.

For example, Patent Document 1 describes a heat pump water heater and a heat pump water heater that increase the temperature by compressing the heat medium that has received the heat amount using a compressor, and supplying hot water by giving the heat amount to city water using a heat exchanger. The system is described.

Japanese Patent Application Publication No. 2012-42105

In the heat pump water heater system as described above, a heat medium that receives exhaust heat from a data center or the like is circulated to supply heat to each heat pump water heater. However, since piping resistance acts in the piping through which the heating medium circulates, the pressure of the heating medium in the piping decreases as the distance from the pump that pumps the heating medium increases. In this case, a heat pump water heater that is far away from the pump receives a smaller flow rate of heat medium than a heat pump water heater that is closer to the pump, resulting in a reduction in heat pump performance.

In view of the above circumstances, one of the objects of the present disclosure is to provide an air conditioning hot water supply system and a collective air conditioning hot water supply system that can maintain substantially constant heat pump capacity regardless of the installation position of the air conditioning hot water supply equipment.

One aspect of the air conditioning hot water supply system according to the present disclosure includes a heat supply facility that supplies heat, and a plurality of air conditioning hot water supply facilities that receive heat from the heat supply facility, and the heat supply facility is a first heat supply facility. The air conditioning hot water supply equipment includes a first circulation circuit that circulates a medium, a second circulation circuit that circulates a second heat medium, a branch pipe connected to the first circulation circuit, and a branch pipe that is connected to the first circulation circuit. a heat pump that transfers heat from the pipeline to the second circulation circuit; and a heat pump that is provided in the branch pipeline and adjusts the pressure of the first heat medium flowing through the branch pipeline to a predetermined pressure. A pressure adjustment mechanism.

One aspect of the collective air conditioning hot water supply system according to the present disclosure includes a second heat supply equipment that supplies heat, and a plurality of air conditioning hot water supply systems that receive heat from the second heat supply equipment, and At least one of the air conditioning and hot water supply systems includes the air conditioning and hot water supply system described above.

According to the present disclosure, the heat pump capacity can be made substantially constant regardless of the installation position of the air conditioning hot water supply equipment.

1 is a schematic diagram showing the configuration of a collective air conditioning hot water supply system in Embodiment 1. FIG. 1 is a schematic diagram showing the configuration of an air conditioning hot water supply facility in Embodiment 1. FIG. 2 is a block diagram showing the configuration of a control device in Embodiment 1. FIG. 5 is a flowchart showing control of the control device in the first embodiment. 7 is a graph showing the relationship between the flow rate of the heat medium flowing inside the branch pipe line and the temperature of the heat medium flowing into the heat exchanger on the primary side of the heat pump in Embodiment 1. FIG. FIG. 2 is a schematic diagram showing the configuration of an air conditioning hot water supply facility in Embodiment 2. FIG. FIG. 3 is a schematic diagram showing the configuration of a collective air conditioning hot water supply system in Embodiment 3.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that the scope of the present disclosure is not limited to the following embodiments, and can be arbitrarily modified within the scope of the technical idea of the present disclosure. Further, in the following drawings, in order to make each structure easier to understand, the scale and number of each structure may be different from the scale and number of the actual structure.

Embodiment 1.
FIG. 1 is a schematic diagram showing the configuration of a collective air conditioning and hot water supply system 1 in the first embodiment. FIG. 1 shows an example of a collective air conditioning and hot water supply system 1 installed in a high-rise housing complex such as a condominium.
The collective air conditioning hot water supply system 1 shown in FIG. A plurality of air conditioning hot water supply systems 3 receiving heat from the equipment 2 are provided.

The central heat supply facility 2 includes a heat pump 11, a circulation circuit 12, a pump 13, an expansion tank 14, and a heat exchanger 15.
For example, a plurality of heat pumps 11 are installed on the roof of an apartment complex. The heat pump 11 collects heat from the atmosphere and heats the heat medium in the piping of the circulation circuit 12.

The circulation circuit 12 connects the heat pump 11, the pump 13, the expansion tank 14, and the heat exchanger 15. The piping of the circulation circuit 12 is filled with a heat medium. An example of a heat medium is water. The pump 13 circulates the heat medium in the piping of the circulation circuit 12 and supplies the heat medium heated by the heat pump 11 to the heat exchanger 15 .

For example, the temperature of the heat medium is 20° C. before being heated by the heat pump 11, and the temperature is 25° C. after being heated. The expansion tank 14 absorbs a part of the heat medium whose volume has increased due to the temperature rise from the circulation circuit 12. The expansion tank 14 is, for example, a closed tank. Since the heat medium in the closed tank does not come into contact with the atmosphere, using a closed tank can suppress evaporation and oxidation of the heat medium in the closed tank to the atmosphere.

The heat exchanger 15 is installed on each floor of the apartment complex. Heat exchanger 15 is, for example, a plate heat exchanger. The heat medium radiates heat in the heat exchanger 15 on each floor, and the air conditioning and hot water supply system 3 on each floor receives the heat. For example, the temperature of the heat medium is 25° C. before the heat is radiated by the heat exchanger 15, and the temperature is 20° C. after the heat is radiated.

The air conditioning and hot water supply system 3 is installed on each floor of the apartment complex. In other words, the air conditioning and hot water supply systems 3 are installed in parallel in the vertical direction. A plurality of residential units are arranged horizontally on each floor, and air conditioning and hot water supply equipment 30 is installed corresponding to each residential unit.

The air conditioning hot water supply system 3 includes a heat supply facility 20 (also referred to as branch heat supply facility) that relays the heat received from the central heat supply facility 2 and supplies it to each dwelling unit, and a plurality of air conditioning hot water supplies that receive heat from the heat supply facility 20. It is equipped with equipment 30. The heat supply equipment 20 includes a circulation circuit 21, a pump 22, and an expansion tank 23.

The circulation circuit 21 connects the pump 22, the expansion tank 23, and the air conditioning hot water supply equipment 30. The piping of the circulation circuit 21 is filled with a heat medium. An example of a heat medium is water. The pump 22 circulates the heat medium in the piping of the circulation circuit 21 and supplies the heat medium heated by the heat exchanger 15 to the air conditioning hot water supply equipment 30.

For example, the heat medium has a temperature of 15° C. before being heated by the heat exchanger 15, and a temperature of 20° C. after being heated. The expansion tank 23 absorbs a part of the heat medium whose volume has increased due to the temperature rise from the circulation circuit 21. The expansion tank 23 is, for example, a closed tank. Since the heat medium in the closed tank does not come into contact with the atmosphere, using a closed tank can suppress evaporation and oxidation of the heat medium in the closed tank to the atmosphere.

FIG. 2 is a schematic diagram showing the configuration of the air conditioning hot water supply equipment 30 in the first embodiment.
The air conditioning and hot water supply equipment 30 shown in FIG. 2 is installed within the dwelling unit 5. Note that the air conditioning and hot water supply equipment 30 may be installed outside the housing unit 5 as long as it is installed for each housing unit 5. Inside the dwelling unit 5, an air conditioning terminal 6 and a hot water supply terminal 7 are installed.

The air conditioning terminal 6 includes, for example, a radiator panel, and air-conditions the inside of the dwelling unit 5 using the heat of hot water or water supplied from the air conditioning hot water supply equipment 30. The hot water supply terminal 7 includes, for example, a shower, and dispenses hot water supplied from the air conditioning hot water supply equipment 30. Note that at least one of the air conditioning terminal 6 and the hot water supply terminal 7 may be connected to the air conditioning and hot water supply equipment 30 .

The air conditioning and hot water supply equipment 30 includes a transformer 31, a control device 32, a tank 33, a circulation circuit 40, a branch pipe 50, and a heat pump 60.
The tank 33 includes a tank heat exchanger 43a inside and stores water. Below, the water stored inside the tank 33 will be referred to as tank water. The tank 33 is connected to the hot water supply terminal 7. The circulation circuit 40 includes an air conditioning circuit 42 connected to the air conditioning terminal 6 and a hot water supply circuit 43 connected to the tank heat exchanger 43a.

The piping of the circulation circuit 40 is filled with a heat medium. An example of a heat medium is water. The circulation circuit 40 is provided with a pump 41 that circulates the heat medium, and a flow path switching mechanism 44 that switches the circulation path of the heat medium to the air conditioning circuit 42 or the hot water supply circuit 43. The flow path switching mechanism 44 is, for example, a three-way switching valve, and communicates two of the three-way flow paths and blocks one.

Specifically, the flow path switching mechanism 44 can communicate with the air conditioning circuit 42 and cut off the hot water supply circuit 43. In this case, the heat medium in the piping of the circulation circuit 40 circulates in the order of the heat exchanger 64 on the secondary side of the heat pump 60, the flow path switching mechanism 44, the air conditioning circuit 42, and the air conditioning terminal 6. The heat medium radiates heat at the air conditioning terminal 6 and warms the inside of the dwelling unit 5.

Further, the flow path switching mechanism 44 can communicate with the hot water supply circuit 43 and can shut off the air conditioning circuit 42. In this case, the heat medium in the piping of the circulation circuit 40 circulates in the order of the heat exchanger 64 on the secondary side of the heat pump 60, the flow path switching mechanism 44, the hot water supply circuit 43, and the tank heat exchanger 43a. The heat medium radiates heat in the tank heat exchanger 43a and heats the tank water. The heated tank water is used at the hot water supply terminal 7.

A temperature sensor 45 is provided in the circulation circuit 40. The temperature sensor 45 is arranged in the circulation circuit 40 on the downstream side of the heat exchanger 64 on the secondary side of the heat pump 60 and on the upstream side of the flow path switching mechanism 44 . The temperature sensor 45 measures the temperature of the heat medium flowing out from the heat exchanger 64 on the secondary side of the heat pump 60 (output hot water temperature).

The heat pump 60 transfers heat from the branch pipe 50 connected to the circulation circuit 21 of the heat supply equipment 20 to the circulation circuit 40. The heat pump 60 includes a circulation circuit 61, a compressor 62, an expansion mechanism 63, a secondary heat exchanger 64, a primary heat exchanger 65, and a flow path switching mechanism 66.

The circulation circuit 61 connects the compressor 62, the expansion mechanism 63, the secondary heat exchanger 64, the primary heat exchanger 65, and the flow path switching mechanism 66. The piping of the circulation circuit 61 is filled with a heat medium. An example of a heat transfer medium is difluoromethane or propane. The compressor 62 compresses and discharges the heat medium in the piping of the circulation circuit 61, thereby circulating the heat medium.

The primary heat exchanger 65 is thermally connected to the circulation circuit 21 of the heat supply equipment 20 via a branch pipe 50. Further, the secondary side heat exchanger 64 is thermally connected to the circulation circuit 40 of the air conditioning terminal 6 and the hot water supply terminal 7. The expansion mechanism 63 is, for example, an expansion valve, and expands the heat medium that has passed through the secondary heat exchanger 64 to lower the temperature.

Specifically, the heat medium in the piping of the circulation circuit 61 radiates heat in the heat exchanger 64 on the secondary side. When the heat medium that has radiated heat passes through the expansion mechanism 63, its temperature decreases and flows into the primary side heat exchanger 65. The heat medium flowing into the primary heat exchanger 65 absorbs heat from the branch pipe 50 in the primary heat exchanger 65 . The heat medium that has absorbed heat flows into the compressor 62 again.

The heat pump 60 repeats this cycle to transfer the heat from the branch pipe 50 to the circulation circuit 40. An example of the temperature of the heat medium in the piping of the branch pipe line 50 is 20° C. before the heat is radiated by the primary

side heat exchanger

65, and 15° C. after the heat is radiated. Further, an example of the temperature of the heat medium in the circulation circuit 40 is 45° C. before heat is absorbed by the secondary

side heat exchanger

64, and 50° C. after heat is absorbed. The amount of heat (watts) that the heat pump 60 provides from the branch pipe line 50 to the circulation circuit 40 is called heat pump capacity.

By changing the circulation flow rate of the heat medium in the circulation circuit 61, the heat pump capacity can be changed. Specifically, by changing at least one of the rotation speed of the compressor 62 and the opening degree of the expansion mechanism 63, the circulation flow rate (heat pump capacity) of the heat medium in the circulation circuit 61 can be changed. By changing the heat pump capacity, the hot water temperature can be increased or decreased.

The flow path switching mechanism 66 is, for example, a four-way switching valve, and switches the flow path of the circulation circuit 61 to form a heating circuit and a cooling circuit. The heating circuit is a circuit that transfers heat from the branch pipe line 50 to the circulation circuit 40. The cooling circuit is a circuit that transfers heat from the circulation circuit 40 to the branch pipe line 50. In the following description, an example will be described in which the flow path switching mechanism 66 forms a heating circuit.

The branch pipe line 50 connects the circulation circuit 21 of the heat supply equipment 20 and the heat exchanger 65 on the primary side of the heat pump 60. The branch pipe line 50 is connected to the outgoing side of the circulation circuit 21 via a connection point 50a provided in the dwelling unit 5, and connected to the primary side heat exchanger 65 via a connection point 50b provided in the air conditioning hot water supply equipment 30. Connected to the upstream side.

The branch pipe line 50 is connected to the return side of the circulation circuit 21 via a connection point 50d provided in the dwelling unit 5, and is connected to the primary side heat exchanger via a connection point 50c provided in the air conditioning hot water supply equipment 30. 65 on the downstream side. That is, the branch pipe line 50 connects the outgoing side and the incoming side of the circulation circuit 21, and forms a flow path that passes through the heat exchanger 65 on the primary side of the air conditioning hot water supply equipment 30.

The branch pipe line 50 is provided with a pressure adjustment mechanism 51 and a flow rate adjustment mechanism 52. The pressure adjustment mechanism 51 adjusts the pressure of the heat medium flowing inside the branch pipe 50 to a predetermined pressure. The predetermined pressure is a pressure at which the differential pressure between the heat medium before and after the pressure adjustment mechanism 51 is approximately constant. The pressure adjustment mechanism 51 is, for example, a differential pressure adjustment valve equipped with a spring, and uses the spring to reduce the pressure of the inflowing heat medium to adjust the pressure difference between the heat medium before and after the pressure adjustment mechanism 51 to be approximately constant. . Note that the pressure adjustment mechanism 51 is not limited to a spring, but may be reduced by an elastic member such as rubber, as long as the pressure of the heat medium flowing inside the branch pipe 50 can be reduced, or it may be reduced by using hydraulic pressure or pneumatic pressure. The pressure may be reduced.

The flow rate adjustment mechanism 52 is provided downstream of the pressure adjustment mechanism 51 in the branch line 50 and adjusts the flow rate of the heat medium flowing inside the branch line 50. The flow rate adjustment mechanism 52 includes, for example, an on-off valve, and changes the flow rate of the heat medium by changing the degree of opening of the branch pipe 50 through which the heat medium flows. The flow rate of the heat medium flowing through the flow rate adjustment mechanism 52 and the branch pipe 50 decreases as the opening of the branch pipe 50 becomes smaller, and increases as the opening of the branch pipe 50 increases.

The flow rate adjustment mechanism 52 further includes an electric motor and a communication device. The electric motor is, for example, a stepping motor driven by 24V, and drives the above-mentioned on-off valve to change the degree of opening of the branch pipe 50. The communication device communicates with the control device 32. The communication device receives a target opening degree, which is a target value of the opening degree of the branch pipe 50, from the control device 32.

The flow rate adjustment mechanism 52 drives the electric motor so that the opening degree of the on-off valve becomes the target opening degree. The transformer 31 is connected to a power source and supplies power to the flow rate adjustment mechanism 52. The transformer 31 changes the voltage by, for example, electromagnetic induction. The voltage of the power supply is, for example, 240V, and the transformer 31 transforms the voltage of the power supply to 24V, which is the drive voltage of the flow rate adjustment mechanism 52.

A temperature sensor 53 is provided in the branch pipe 50. The temperature sensor 53 is arranged in the branch pipe line 50 on the downstream side of the flow rate adjustment mechanism 52 and on the upstream side of the heat exchanger 65 on the primary side of the heat pump 60. The temperature sensor 53 measures the temperature of the heat medium flowing into the heat exchanger 65 on the primary side of the heat pump 60.

FIG. 3 is a block diagram showing the configuration of the control device 32 in the first embodiment.
As shown in FIG. 3, the control device 32 is connected to the

temperature sensors

45, 53 described above, and receives measurement results from the

temperature sensors

45, 53. Further, the control device 32 is connected to the compressor 62, the expansion mechanism 63, and the flow path switching mechanism 66 described above, and controls switching between the heating circuit and the cooling circuit and the heat pump capacity of the heat pump 60.

Further, the control device 32 is connected to the pump 41 and the flow path switching mechanism 44 described above, and controls switching between the air conditioning circuit 42 and the hot water supply circuit 43 and the circulation or stopping of the heat medium to the air conditioning circuit 42 and the hot water supply circuit 43. . Furthermore, the control device 32 is connected to the above-mentioned flow rate adjustment mechanism 52 and adjusts the flow rate of the heat medium flowing inside the branch pipe 50 to supply the heat medium to the heat exchanger 65 on the primary side of the heat pump 60. control the flow rate.

The control device 32 changes the target opening degree of the branch pipe 50 based on the temperature measured by the temperature sensor 53 provided in the branch pipe 50. The control device 32 decreases the target opening degree of the branch pipe line 50 when the temperature measured by the temperature sensor 53 increases, and increases the target opening degree of the branch pipe line 50 when the temperature measured by the temperature sensor 53 decreases. . The target opening degree of the branch pipe line 50 can be selected, for example, between 0% (fully closed) and 100% (fully open).

Furthermore, the control device 32 has a target temperature as a control parameter. The target temperature is a target value of the hot water temperature, and is set to, for example, 50°C. The target temperature is usually set based on the temperature that the resident of the dwelling unit 5 would like to use at the hot water supply terminal 7 or the air conditioning terminal 6. Although details will be described later, the control device 32 changes the rotation speed of the compressor 62, the opening degree of the expansion mechanism 63, and the target opening degree of the branch pipe 50 so that the outlet hot water temperature reaches the target temperature.

Furthermore, the control device 32 has, as control parameters, an upper limit rotation speed that is an upper limit value of the rotation speed of the compressor 62, and a lower limit rotation speed that is a lower limit value of the rotation speed of the compressor 62. The control device 32 increases the target opening degree of the branch pipe line 50 when the rotation speed of the compressor 62 reaches the upper limit rotation speed, and increases the target opening degree of the branch pipe line 50 when the rotation speed of the compressor 62 reaches the lower limit rotation speed. The target opening degree of the conduit 50 is decreased. Note that the control device 32 may increase (or decrease) the target opening degree of the branch pipe 50 immediately before the rotation speed of the compressor 62 reaches the upper limit (or lower limit) of the rotation speed.

Further, the control device 32 has, as control parameters, an upper limit opening that is the upper limit of the target opening of the branch pipe 50, and a lower limit opening that is the lower limit of the target opening of the branch pipe 50. . The upper limit opening degree and the lower limit opening degree may be set values selected between 0% (fully closed) and 100% (fully open), or the upper limit opening degree may be 100% (fully open) and the lower limit opening degree may be set values selected between 0% (fully closed) and 100% (fully open). It may be 0% (fully closed).

FIG. 4 is a flowchart showing control by the control device 32 in the first embodiment. In the following explanation, the control device 32 performs control so that the outlet hot water temperature becomes the target temperature.
First, the control device 32 compares the measurement result (output hot water temperature) of the temperature sensor 45 with a target temperature (step S1).

If the outlet hot water temperature is lower than the target temperature, the control device 32 increases the rotation speed of the compressor 62 in order to raise the outlet hot water temperature (step S2). Next, the control device 32 compares the rotation speed of the compressor 62 and the upper limit rotation speed (step S3). If the rotational speed of the compressor 62 has not reached the upper limit rotational speed, the process returns to step S1 and the outlet hot water temperature is compared with the target temperature.

On the other hand, if the rotation speed of the compressor 62 reaches the upper limit rotation speed before the outlet hot water temperature reaches the target temperature, the control device 32 controls the target temperature of the branch pipe 50 as the next step to increase the outlet hot water temperature. The opening degree is increased (step S4). Next, the control device 32 compares the target opening degree and the upper limit opening degree of the branch pipe 50 (step S5).

If the target opening degree of the branch pipe 50 has not reached the upper limit opening degree, the process returns to step S1 and compares the outlet hot water temperature and the target temperature. On the other hand, if the target opening degree of the branch pipe 50 reaches the upper limit opening degree before the outlet hot water temperature reaches the target temperature, the control device 32 ends the control.

If the determination is NO in step S1, the control device 32 compares the outlet temperature with the target temperature (step S6). If the outlet temperature is higher than the target temperature, the control device 32 reduces the rotation speed of the compressor 62 in order to lower the outlet temperature (step S7). Next, the control device 32 compares the rotation speed of the compressor 62 and the lower limit rotation speed (step S8).

If the rotation speed of the compressor 62 is not the lower limit rotation speed, the process returns to step S1 and the outlet hot water temperature is compared with the target temperature. On the other hand, if the rotation speed of the compressor 62 reaches the lower limit rotation speed before the outlet hot water temperature decreases to the target temperature, the control device 32 controls the branch pipe 50 as the next step to lower the outlet hot water temperature. The target opening degree is decreased (step S9).

Next, the control device 32 compares the target opening degree and the lower limit opening degree of the branch pipe 50 (step S10). If the target opening degree of the branch pipe 50 has not reached the lower limit opening degree, the process returns to step S1 and compares the outlet hot water temperature and the target temperature. On the other hand, if the target opening degree of the branch pipe 50 reaches the lower limit opening degree before the outlet hot water temperature decreases to the target temperature, the control device 32 ends the control.
As described above, the control device 32 performs control so that the hot water temperature reaches the target temperature.

In the above-mentioned air conditioning hot water supply system 3, as shown in FIG. 1, piping resistance acts on the heat medium circulating inside the circulation circuit 21 of the heat supply equipment 20, so the heat decreases as the distance from the pump 22 increases. The pressure of the medium decreases. Therefore, even if the pipe diameter of the circulation circuit 21 is constant, the closer the distance from the pump 22 is to the air conditioning hot water supply equipment 30, the more likely the flow rate of the heat medium will increase, and the farther the distance from the pump 22 is to the air conditioning hot water supply equipment 30, the more the flow rate of the heat source medium will increase. tends to decrease. The heat pump capacity of each air conditioning hot water supply equipment 30 changes depending on the flow rate of the heat medium; when the flow rate of the heat medium is high, the capacity increases, and when the flow rate is low, the capacity decreases. Therefore, each air conditioning hot water supply equipment 30 has a different heat pump capacity depending on its installation position.

On the other hand, in the air conditioning hot water supply system 3 of the first embodiment described above, as shown in FIG. A pressure adjustment mechanism 51 is provided to adjust the pressure to a predetermined pressure. According to this configuration, the differential pressure of the heat medium before and after the pressure adjustment mechanism 51 of each air conditioning hot water supply equipment 30 can be adjusted to a substantially constant value, so regardless of the distance from the pump 22 to the air conditioning water heating equipment 30, Regardless of the position of the dwelling unit 5, the flow rate of the heat medium flowing into the air conditioning hot water supply equipment 30 is substantially constant, and the heat pump capacity of the air conditioning hot water supply equipment 30 can be made substantially constant.

As described above, the air conditioning hot water supply system 3 of the first embodiment described above includes the heat supply equipment 20 that supplies heat, and the plurality of air conditioning hot water supply equipment 30 that receives heat from the heat supply equipment 20, and The equipment 20 includes a circulation circuit 21 (first circulation circuit) that circulates a heat medium (first heat medium), and the air conditioning hot water supply equipment 30 includes a circulation circuit 40 that circulates a heat medium (second heat medium). (second circulation circuit), a branch pipe 50 connected to the circulation circuit 21, a heat pump 60 that transfers heat from the branch pipe 50 to the circulation circuit 40, and a heat pump 60 provided in the branch pipe 50 and connected to the branch pipe A pressure adjustment mechanism 51 is provided to adjust the pressure of the heat medium flowing inside the heating medium 50 to a predetermined pressure. According to this configuration, the heat pump capacity can be made substantially constant regardless of the installation position of the air conditioning hot water supply equipment 30.

Further, according to the first embodiment, the air conditioning hot water supply equipment 30 is provided downstream of the pressure adjustment mechanism 51 in the branch pipe 50, and is a flow rate adjuster that adjusts the flow rate of the heat medium flowing inside the branch pipe 50. The control device 32 includes a mechanism 52 and a control device 32 that controls the flow rate adjustment mechanism 52. The control device 32 changes the target opening degree of the branch pipe 50 based on the temperature measured by the temperature sensor 53. The flow rate adjustment mechanism 52 drives the electric motor so that the opening degree of the on-off valve becomes the target opening degree. Through this operation, the control device 32 can control the opening degree of the on-off valve of the flow rate adjustment mechanism 52. According to this configuration, since the pressure adjustment mechanism 51 adjusts the differential pressure on the upstream side of the flow rate adjustment mechanism 52, when the flow rate adjustment mechanism 52 changes the opening degree of the branch pipe 50, the air conditioning Regardless of the distance of the hot water supply equipment 30, that is, regardless of the position of the housing unit 5 of the apartment complex, the relationship between the opening degree of the branch pipe 50 and the flow rate of the heat medium is stable, and if the opening degree is the same, the flow rate will be the same. Become. Therefore, the heat pump capacity of the air conditioning hot water supply equipment 30 remains approximately constant.

Further, according to the first embodiment, the flow rate adjustment mechanism 52 causes the flow rate of the heat medium flowing through the branch pipe 50 to increase as the temperature of the heat medium flowing into the heat exchanger 65 on the primary side of the heat pump 60 increases. As the temperature of the heat medium flowing into the heat exchanger 65 on the primary side of the heat pump 60 decreases, the flow rate of the heat medium flowing through the branch pipe 50 increases. Thereby, the flow rate of the heat medium decreases as the temperature of the heat medium flowing into the primary heat exchanger 65 increases, so that excessive heat pump capacity can be suppressed. Moreover, according to this configuration, the flow rate of the heat medium increases as the temperature of the heat medium flowing into the primary side heat exchanger 65 decreases, so that insufficient heat pump capacity can be suppressed.

Specifically, according to the first embodiment, the air conditioning hot water supply equipment 30 includes a temperature sensor 53 that is provided in the branch pipe line 50 and measures the temperature of the heat medium flowing into the heat exchanger 65 on the primary side of the heat pump 60. In addition, the control device 32 controls the flow rate adjustment mechanism 52 based on the temperature measured by the temperature sensor 53. That is, the control device 32 changes the target opening degree of the branch pipe 50 based on the temperature measured by the temperature sensor 53. The flow rate adjustment mechanism 52 drives the electric motor so that the opening degree of the on-off valve becomes the target opening degree. Through this operation, the control device 32 can control the opening degree of the on-off valve of the flow rate adjustment mechanism 52. According to this configuration, the amount of heat of the heat medium supplied to the heat pump 60 can be adjusted to widen the range of control over the outlet temperature.

FIG. 5 is a graph showing the relationship between the flow rate of the heat medium flowing inside the branch pipe line 50 and the temperature of the heat medium flowing into the heat exchanger 65 on the primary side of the heat pump 60 in the first embodiment. Note that the graph shown in FIG. 5 exemplifies a case where the temperature of the heat medium flowing into the heat exchanger 65 on the primary side of the heat pump 60 is 20° C., and the flow rate of the heat medium is 10 L/min.
As shown in FIG. 5, when the temperature of the heat medium flowing through the branch pipe line 50 increases, the flow rate of the heat medium flowing into the heat exchanger 65 on the primary side of the heat pump 60 decreases. Further, when the temperature of the heat medium flowing through the branch pipe line 50 decreases, the flow rate of the heat medium flowing into the heat exchanger 65 on the primary side of the heat pump 60 increases. Further, when the temperature of the heat medium does not change at 20° C., when the number of rotations of the compressor 62 reaches the upper limit rotation speed, that is, when the rotation speed of the compressor 62 stops increasing, the primary The flow rate of the heat medium flowing into the side heat exchanger 65 increases. Further, when the temperature of the heat medium does not change at 20° C., when the number of rotations of the compressor 62 reaches the lower limit rotation speed, that is, when the rotation speed of the compressor no longer decreases, the primary side of the heat pump 60 The flow rate of the heat medium flowing into the heat exchanger 65 decreases.

The heat pump capacity increases as the temperature of the heat medium flowing into the primary heat exchanger 65 increases and as the flow rate of the heat medium flowing into the primary heat exchanger 65 increases. Furthermore, the heat pump capacity decreases as the temperature of the heat medium flowing into the primary heat exchanger 65 decreases, and as the flow rate of the heat medium flowing into the primary heat exchanger 65 decreases.

According to the first embodiment, the control device 32 reduces the target opening degree of the branch pipe 50 when the temperature measured by the temperature sensor 53 increases, and reduces the target opening degree of the branch pipe 50 when the temperature measured by the temperature sensor 53 decreases. Increase the target opening of 50. According to this configuration, the flow rate of the heat medium decreases as the temperature of the heat medium flowing into the primary heat exchanger 65 increases, so that excessive heat pump capacity can be suppressed. Moreover, according to this configuration, the flow rate of the heat medium increases as the temperature of the heat medium flowing into the primary side heat exchanger 65 decreases, so that insufficient heat pump capacity can be suppressed.

Further, according to the first embodiment, the heat pump 60 operates between the circulation circuit 61 (third circulation circuit) in which the heat medium (third heat medium) circulates, and between the branch pipe line 50 and the circulation circuit 61. It is equipped with a heat exchanger 65 that exchanges heat, and a compressor 62 that is provided in the circulation circuit 61 and compresses the heat medium. The flow rate of the heat medium flowing into the heat exchanger 65 increases, and when the rotational speed of the compressor 62 no longer decreases, the flow rate of the heat medium flowing into the heat exchanger 65 decreases. As a result, for example, when the rotation speed of the compressor 62 is increased and the heat pump capacity is increased to the upper limit rotation speed of the compressor 62, the flow rate of the supplied heat medium further increases, so that the capacity of the compressor 62 is increased. Heat pump capacity can be increased over a wider range than adjustment. Further, for example, when the rotation speed of the compressor 62 is decreased and the heat pump capacity is lowered to the lower limit rotation speed of the compressor 62, the flow rate of the supplied heat medium further decreases, so the capacity adjustment in the compressor 62 is performed. The heat pump capacity can be reduced over a wider range.

Specifically, according to the first embodiment, the control device 32 controls the flow rate adjustment mechanism 52 based on the rotation speed of the compressor 62. That is, the control device 32 increases the target opening degree of the branch pipe 50 when the rotation speed of the compressor 62 reaches the upper limit rotation speed, and when the rotation speed of the compressor 62 reaches the lower limit rotation speed. , the target opening degree of the branch pipe line 50 is decreased. The flow rate adjustment mechanism 52 drives the electric motor so that the opening degree of the on-off valve becomes the target opening degree. Through this operation, the control device 32 can control the opening degree of the on-off valve of the flow rate adjustment mechanism 52. According to this configuration, the amount of heat of the heat medium supplied to the heat pump 60 can be adjusted, and the adjustment range of the heat pump capacity can be expanded to a wider range than the adjustment range of the heat pump capacity by the compressor 62.

According to Embodiment 1, when the rotation speed of the compressor 62 reaches the upper limit rotation speed, the control device 32 increases the target opening degree of the branch pipe 50 so that the rotation speed of the compressor 62 reaches the lower limit rotation speed. When the rotational speed is reached, the target opening degree of the branch pipe 50 is decreased. For example, when the rotation speed of the compressor 62 is increased and the heat pump capacity is increased to the upper limit rotation speed of the compressor 62, the flow rate of the supplied heat medium further increases, so that the capacity adjustment in the compressor 62 is Heat pump capacity can be increased over a wide range. Further, for example, when the rotation speed of the compressor 62 is decreased and the heat pump capacity is lowered to the lower limit rotation speed of the compressor 62, the flow rate of the supplied heat medium further decreases, so the capacity adjustment in the compressor 62 is performed. The heat pump capacity can be reduced over a wider range.

Since the target temperature is usually set to a temperature that the residents of the dwelling unit 5 prefer, the heat pump capacity required for each dwelling unit 5 is different. In other words, the air conditioning and hot water supply equipment 30 can individually adjust the heat pump capacity in each dwelling unit 5 according to the set value of the target temperature of each dwelling unit.

Furthermore, according to the first embodiment, the air conditioning and hot water supply equipment 30 includes a transformer 31 that is connected to a power source and supplies power to the flow rate adjustment mechanism 52. According to this configuration, the voltage of the power supply can be changed to the voltage necessary for the electric motor of the flow rate adjustment mechanism 52. Therefore, in the dwelling unit 5, there is no need to perform electrical wiring with a voltage different from that of the power supply, which saves construction work.

Moreover, according to the collective air conditioning hot water supply system 1 of the first embodiment, the central heat supply equipment 2 (second heat supply equipment) that supplies heat, and the plurality of air conditioning hot water supply systems 3 that receive heat from the central heat supply equipment 2 At least one (all in the first embodiment) of the plurality of air conditioning and hot water supply systems 3 includes an air conditioning and hot water supply equipment 30 including the pressure adjustment mechanism 51 described above. According to this configuration, even when the system is introduced into a large-scale housing complex, the heat pump capacity can be kept substantially constant regardless of the installation position of the air conditioning hot water supply equipment 30.

Furthermore, according to the first embodiment, the plurality of air conditioning and hot water supply systems 3 are installed side by side in the vertical direction. According to this configuration, even when the system is introduced into a high-rise apartment complex, the heat pump capacity can be kept substantially constant regardless of the installation position of the air conditioning hot water supply equipment 30.

Embodiment 2.
FIG. 6 is a schematic diagram showing the configuration of the air conditioning hot water supply equipment 30 in the second embodiment. Note that, in the following description, the same components as those in the embodiment described above may be given the same reference numerals as appropriate, and the description thereof may be omitted.

The air conditioning hot water supply equipment 30 shown in FIG. 6 includes a pressure opening adjustment unit 34 that includes a pressure adjustment mechanism 51 and a flow rate adjustment mechanism 52, and an air conditioning hot water supply unit 35 that includes a heat pump 60 and a circulation circuit 40. Note that the air conditioning and hot water supply unit 35 further includes a transformer 31, a control device 32, a tank 33, and the like.

The branch pipe 50 connects the pressure opening degree adjustment unit 34 and the air conditioning hot water supply unit 35. By adjusting the length of the branch pipe 50 that connects the pressure opening adjustment unit 34 and the air conditioning hot water supply unit 35, the arrangement of the pressure opening adjustment unit 34 and the air conditioning hot water supply unit 35 can be arranged arbitrarily for each dwelling unit 5. Can be adjusted to position. In this way, according to the second embodiment, the degree of freedom in installing the air conditioning hot water supply equipment 30 is improved.

Embodiment 3.
FIG. 7 is a schematic diagram showing the configuration of the collective air conditioning and hot water supply system 1 in the third embodiment. Note that, in the following description, the same components as those in the embodiment described above may be given the same reference numerals as appropriate, and the description thereof may be omitted.

In the collective air conditioning hot water supply system 1 shown in FIG. 7, a pressure adjustment mechanism 25 is provided in each of a plurality of branch pipes 24 that connect the circulation circuit 12 of the central heat supply equipment 2 and the heat exchangers 15 on each floor. It is being The branch pipe line 24 is connected to the outbound side of the circulation circuit 12 via the connection point 24b, and connected to the return side of the circulation circuit 12 via the connection point 24a.

The pressure adjustment mechanism 25 adjusts the pressure of the heat medium flowing inside the branch pipe 24 to a predetermined pressure. The pressure adjustment mechanism 25 is, for example, a differential pressure adjustment valve equipped with a spring, and uses the spring to reduce the pressure of the heat medium flowing in, thereby adjusting the pressure difference between the heat medium before and after the pressure adjustment mechanism 51 to be approximately constant. . The predetermined pressure is a pressure at which the differential pressure between the heat medium before and after the pressure adjustment mechanism 51 is approximately constant. Note that the pressure adjustment mechanism 25 is not limited to a spring, but may be reduced by an elastic member such as rubber, as long as the pressure of the heat medium flowing inside the branch pipe 24 can be reduced, or it may be reduced by using hydraulic pressure or pneumatic pressure. The pressure may be reduced.

Since a hydrostatic head is applied to the heat medium in the circulation circuit 12 due to the difference in height, the pressure of the heat medium is lower in higher floors, and higher in lower floors. According to the third embodiment described above, since the pressure adjustment mechanism 25 is provided in the branch pipe line 24 connected to the heat exchanger 15 of each floor, the air conditioning and hot water supply system 3 of each floor can be adjusted regardless of the height difference. The flow rate of the inflowing heat medium can be made substantially constant. Therefore, the capacity of the air conditioning hot water supply system 3 of each floor can be made substantially constant.

Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the configurations of each embodiment described above, and the following configurations and methods can also be adopted.

Each air conditioning hot water supply equipment 30 (each residential unit 5) of the air conditioning hot water supply system 3 does not need to be installed on the same floor, and may be installed across several floors.

One apartment building may be equipped with a plurality of collective air conditioning and hot water supply systems 1.

The central heat supply equipment 2 includes a heat pump 11 that collects heat from the atmosphere, but the heat source for heating the heat medium may be a gas or kerosene boiler. Furthermore, the heat pump 11 may be replaced by a heat exchanger so that the heat medium can be heated with heat generated in a waste incineration facility, power plant, data center, or the like.

The residential unit 5 is an example of a heat utilization space in which heat is utilized by the collective air conditioning and hot water supply system 1, and is not limited to a residence, but may be a commercial store or an office space.

The pressure adjustment mechanism 51, the flow rate adjustment mechanism 52, and the air conditioning hot water supply equipment 30 may be installed in each dwelling unit 5, and may be installed in the living space of each dwelling unit 5 (inside the so-called entrance), or may be installed in a pipe. It may also be outside the living space, such as in a shaft or meter box.

The pressure adjustment mechanism 51 and the flow rate adjustment mechanism 52 may be installed downstream of the heat exchanger 65 on the primary side of the heat pump 60 in the branch pipe line 50. The flow rate adjustment mechanism 52 only needs to be installed downstream of the pressure adjustment mechanism 51.

The air conditioning hot water supply unit 35 may further include two units: a hot water supply circuit unit and an air conditioning circuit unit.

The tank heat exchanger 43a may be installed outside the tank 33. In that case, if a tank circulation pump is installed between the tank 33 and the tank heat exchanger 43a, tank water can be guided to the tank heat exchanger 43a.

The control device 32 includes a first control device that controls the flow rate adjustment mechanism 52 based on the temperature measured by the temperature sensor 53 and a second control device that controls the flow rate adjustment mechanism 52 based on the rotation speed of the compressor 62. The control device may be divided into two control devices.

As described above, each structure and each method described in this specification can be combined as appropriate within a mutually consistent range.

1...Collective air conditioning hot water supply system, 2...Central heat supply equipment (second heat supply equipment), 3...Air conditioning hot water supply system, 5...Dwelling unit, 6...Air conditioning terminal, 7...Water supply terminal, 11...Heat pump, 12...Circulation circuit , 13... Pump, 14... Expansion tank, 15... Heat exchanger, 20... Heat supply equipment, 21... Circulation circuit (first circulation circuit), 22... Pump, 23... Expansion tank, 24... Branch pipe line, 24a ... connection point, 24b ... connection point, 25 ... pressure adjustment mechanism, 30 ... air conditioning hot water supply equipment, 31 ... transformer, 32 ... control device, 33 ... tank, 34 ... pressure opening adjustment unit, 35 ... air conditioning hot water supply unit, 40 ... circulation circuit (second circulation circuit), 41 ... pump, 42 ... air conditioning circuit, 43 ... hot water supply circuit, 43a ... tank heat exchanger, 44 ... flow path switching mechanism, 45 ... temperature sensor, 50 ... branch pipe, 50a... Connection point, 50b... Connection point, 50c... Connection point, 50d... Connection point, 51... Pressure adjustment mechanism, 52... Flow rate adjustment mechanism, 53... Temperature sensor, 60... Heat pump, 61... Circulation circuit (third circulation circuit), 62...Compressor, 63...Expansion mechanism, 64...Heat exchanger, 65...Heat exchanger, 66...Flow path switching mechanism

Claims

Heat supply equipment that supplies heat;
a plurality of air conditioning hot water supply equipment that receives heat from the heat supply equipment;
The heat supply equipment includes:
comprising a first circulation circuit that circulates the first heat medium;
The air conditioning and hot water supply equipment is
a second circulation circuit that circulates a second heat medium;
a branch pipe connected to the first circulation circuit;
a heat pump that transfers heat from the branch pipe to the second circulation circuit;
An air conditioning hot water supply system, comprising: a pressure adjustment mechanism that is provided in the branch pipe and adjusts the pressure of the first heat medium flowing through the branch pipe to a predetermined pressure.
The air conditioning and hot water supply equipment is
a flow rate adjustment mechanism that is provided on the downstream side of the pressure adjustment mechanism in the branch line and adjusts the flow rate of the first heat medium flowing inside the branch line;
The air conditioning hot water supply system according to claim 1, comprising a control device that controls the flow rate adjustment mechanism.
The higher the temperature of the first heat medium flowing into the heat exchanger of the heat pump, the lower the flow rate of the first heat medium flowing through the branch pipe, and the more the first heat medium flows into the heat exchanger of the heat pump. The air conditioning hot water supply system according to claim 2, wherein the lower the temperature of the first heat medium, the greater the flow rate of the first heat medium flowing through the branch pipe.
The air conditioning and hot water supply equipment is
A temperature sensor is provided in the branch pipe line and measures the temperature of the first heat medium flowing into the heat exchanger of the heat pump,
The air conditioning hot water supply system according to claim 2 or 3, wherein the control device controls the flow rate adjustment mechanism based on the temperature measured by the temperature sensor.
The control device includes:
When the temperature measured by the temperature sensor increases, reducing the target opening degree of the branch pipe,
The air conditioning hot water supply system according to claim 4, wherein when the temperature measured by the temperature sensor decreases, the target opening degree of the branch pipe is increased.
The heat pump is
a third circulation circuit in which a third heat medium circulates;
a heat exchanger that exchanges heat between the branch pipe line and the third circulation circuit;
a compressor provided in the third circulation circuit and compressing the third heat medium,
When the rotation speed of the compressor no longer increases, the flow rate of the first heat medium flowing into the heat exchanger increases, and when the rotation speed of the compressor no longer decreases, the flow rate of the first heat medium flows into the heat exchanger. The air conditioning hot water supply system according to any one of claims 2 to 5, wherein the flow rate of the first heat medium flowing in is reduced.
The air conditioning hot water supply system according to claim 6, wherein the control device controls the flow rate adjustment mechanism based on the rotation speed of the compressor.
The control device includes:
When the rotation speed of the compressor reaches an upper limit rotation speed, increasing the target opening degree of the branch pipe,
The air conditioning hot water supply system according to claim 7, wherein the target opening degree of the branch pipe is reduced when the rotation speed of the compressor reaches a lower limit rotation speed.
The air conditioning and hot water supply system according to any one of claims 2 to 8, wherein the air conditioning and hot water supply equipment includes a transformer that is connected to a power source and supplies power to the flow rate adjustment mechanism.
The air conditioning and hot water supply equipment is
a pressure opening adjustment unit including the pressure adjustment mechanism and the flow rate adjustment mechanism;
The air conditioning hot water supply system according to any one of claims 2 to 9, comprising: an air conditioning hot water supply unit including the heat pump and the second circulation circuit.
a second heat supply facility that supplies heat;
a plurality of air conditioning hot water supply systems that receive heat from the second heat supply equipment;
A collective air-conditioning and hot-water supply system, wherein at least one of the plurality of air-conditioning and hot-water supply systems includes the air-conditioning and hot-water supply system according to any one of claims 1 to 10.
The collective air-conditioning and hot-water supply system according to claim 11, wherein the plurality of air-conditioning and hot-water supply systems are installed side by side in the vertical direction.