WO2023119590A1

WO2023119590A1 - Heat pump device

Info

Publication number: WO2023119590A1
Application number: PCT/JP2021/048010
Authority: WO
Inventors: 啓輔 ▲高▼山; 慶郎青▲柳▼; 泰光野村
Original assignee: 三菱電機株式会社
Priority date: 2021-12-23
Filing date: 2021-12-23
Publication date: 2023-06-29

Abstract

A heat pump device according to the present disclosure supplies a heat medium to a tank unit having a water heat exchanger that exchanges heat between the heat medium and water stored in a hot-water storage tank. This heat pump device comprises: a compressor that compresses a refrigerant; a heat medium heat exchanger that exchanges heat between the refrigerant and the heat medium; a heat transfer performance determination means for determining the heat transfer performance of the water heat exchanger; and a compressor control means for adjusting the rotation speed of the compressor during hot-water storage operation for increasing the temperature of water in the hot-water storage tank. The compressor control means adjusts the compressor rotation speed during the hot-water storage operation so that the compressor rotation speed when the heat transfer performance of the water heat exchanger is determined to be relatively low is higher than that when the heat transfer performance of the water heat exchanger is determined to be relatively high.

Description

heat pump equipment

The present disclosure relates to a heat pump device.

The heat pump cycle device disclosed in Patent Document 1 below adds a target calculated temperature T1 to a second hot water storage tank temperature Ts2 to obtain a target hot water outlet temperature when the water stored in the hot water storage tank is heated to a predetermined temperature. Tea is calculated, and the rotational speed of the compressor is controlled so that the discharged hot water temperature Te of the heat exchanger on the user side becomes equal to the target discharged hot water temperature Tea.

Japanese Patent Application Laid-Open No. 2013-155991

The tank unit used in combination with the heat pump device is equipped with a water heat exchanger that exchanges heat between the heat medium and the water stored in the hot water storage tank. There are several types of tank units that differ in the construction of the water heat exchanger. When a tank unit having a water heat exchanger with a different structure is combined with a heat pump device, there is a possibility that the hot water storage operation cannot be performed appropriately.

The present disclosure has been made to solve the problems described above, and an object of the present disclosure is to provide a heat pump device that can be combined with a plurality of types of tank units having different structures of water heat exchangers. .

A heat pump device according to the present disclosure is a heat pump device that supplies a heat medium to a tank unit having a water heat exchanger that exchanges heat between a heat medium and water stored in a hot water storage tank, a compressor that compresses the heat medium heat exchanger that exchanges heat between the refrigerant and the heat medium; heat transfer performance determination means that determines the heat transfer performance of the water heat exchanger; Compressor control means for adjusting the rotation speed of the compressor during the hot water storage operation, which is an operation for raising the temperature, and the compressor control means is determined to have a relatively low heat transfer performance of the water heat exchanger. The rotational speed of the compressor during hot water storage operation is set so that the rotational speed of the compressor is higher than the rotational speed of the compressor when it is determined that the heat transfer performance of the water heat exchanger is relatively high. is adjusted.

According to the present disclosure, it is possible to provide a heat pump device that can be combined with a plurality of types of tank units having different water heat exchanger structures.

1 is a diagram showing a heat pump device according to Embodiment 1 and a hot water supply system including the same; FIG. 1 is a functional block diagram of a hot water supply system according to Embodiment 1; FIG. 1 is a diagram showing a heat pump device according to Embodiment 1 and a hot water supply system including the same; FIG. 4 is a flowchart showing an example of processing executed by the hot water supply system when selecting a hot water storage operation mode; 4 is a flow chart showing an example of processing executed by the hot water supply system during initial hot water storage operation. FIG. 4 is a diagram showing the relationship between continuously rising stored hot water temperature and the heating capacity of the heat pump device at that time. FIG. 4 is a diagram showing an example of how icons are displayed on a display; Flowchart showing an example of processing executed by the hot water supply system in Embodiment 2

Embodiments will be described below with reference to the drawings. Elements that are common or correspond to each figure are denoted by the same reference numerals, and their explanations are simplified or omitted. In the following description, "water" or "hot water" basically means liquid water, and can include cold water to hot water.

Embodiment 1.
FIG. 1 shows a heat pump device 2 according to Embodiment 1 and a hot water supply system 1 including the same. The heat pump device 2 is separate from the tank unit 3 . The heat pump device 2 supplies a heated heat medium to the tank unit 3 . The heat pump device 2 is arranged outdoors. The tank unit 3 is arranged outdoors or indoors. The heat pump device 2 is combined with the tank unit 3 to configure the hot water supply system 1 . Not only in the case where the hot water supply system 1 is configured by connecting the heat pump device 2 to the tank unit 3 manufactured by the same manufacturer as the heat pump device 2, but also in the tank unit 3 manufactured by a manufacturer different from the heat pump device 2, Hot water supply system 1 may be configured by connecting heat pump device 2 .

A housing 43 of the heat pump device 2 includes a compressor 4 for compressing refrigerant, a heat medium heat exchanger 5, an expansion valve 6, an evaporator 7, a first controller 9, and a blower 10. It is Substances used as refrigerants are not particularly limited, but CO ₂ , HFCs, HCs, HFOs, etc. can be used, for example. The heat medium heat exchanger 5 includes a primary flow path 5a and a secondary flow path 5b. Heat is exchanged between the refrigerant passing through the primary flow path 5a and the heat medium passing through the secondary flow path 5b. The liquid used as the heat medium may be water or brine other than water. A refrigerant circuit is formed by connecting the compressor 4, the primary flow path 5a, the expansion valve 6, and the evaporator 7 via refrigerant pipes.

The expansion valve 6 corresponds to a decompression device that decompresses and expands the high-pressure refrigerant. The evaporator 7 evaporates the refrigerant by exchanging heat between the outdoor air taken in from the outside of the heat pump device 2 and the refrigerant. The blower 10 blows outside air so that it flows past the evaporator 7 .

A hot water storage tank 11 , a water heat exchanger 12 , a heat medium pump 13 , a water pump 14 , and a flow path switching valve 15 are provided inside the housing 44 of the tank unit 3 .

The hot water storage tank 11 is a container for storing hot water. The hot water storage tank 11 is covered with a heat insulating material (not shown). An outflow port 17 is provided at the bottom of the hot water storage tank 11 . The inflow port 18 is provided in the hot water storage tank 11 at a position higher than the outflow port 17 . The hot water tank 11 has, for example, a cylindrical outer shape.

The water heat exchanger 12 includes a primary flow path 12a and a secondary flow path 12b. Heat is exchanged between the heat medium passing through the primary flow path 12a and the water passing through the secondary flow path 12b. A water feed passage 19 connects the outlet 17 to the inlet of the secondary flow path 12b. A water return passage 20 connects the outlet of the secondary flow path 12 b to the inlet 18 . A water pump 14 is provided in the middle of the water return passage 20. - 特許庁A water circuit 21 is formed by the water feed passage 19 , the secondary flow passage 12 b and the water return passage 20 . When the water pump 14 is activated, water in the water circuit 21 flows.

A water supply pipe 22 is connected to the bottom of the hot water storage tank 11 . The water supply pipe 22 extends to the outside of the tank unit 3 . Water supplied from a water source such as tap water flows into the hot water storage tank 11 through the water supply pipe 22 . A hot water supply pipe 23 is connected to the upper portion of the hot water storage tank 11 . Hot water supply pipe 23 extends to the outside of tank unit 3 . Hot water stored in the hot water storage tank 11 is supplied through a hot water supply pipe 23 to a hot water supply end such as a shower, a faucet, or a bathtub. When hot water flows out from the hot water storage tank 11 through the hot water supply pipe 23, the same amount of water flows into the hot water storage tank 11 from the water supply pipe 22. - 特許庁As a result, the hot water storage tank 11 is kept full.

A heating device 24 for warming the room may be connected to the tank unit 3 as in the illustrated example. In the following description, the operation in which the heat medium is circulated through the heating device 24 is referred to as heating operation. A heating device 24 is installed in the room. The heating device 24 may include, for example, at least one of a floor heating panel installed under the floor, a radiator installed on the indoor wall surface, a panel heater, and a fan convector.

A branch portion 25 is formed in the passage on the upstream side of the suction port of the heat medium pump 13 . The passage 26 connects the outlet of the primary flow path 12 a of the water heat exchanger 12 to the branch portion 25 . The channel switching valve 15 is a valve for switching the circuit through which the heat medium flows. The channel switching valve 15 has an a port as an inflow port, a c port as an outflow port, and a d port as an outflow port.

The

passages

27 and 28 connect the heat pump device 2 to the tank unit 3 . The passage 27 connects the outlet of the heat medium pump 13 to the inlet of the secondary flow path 5 b of the heat medium heat exchanger 5 . A passage 28 connects the outlet of the secondary flow path 5 b to the a port of the flow path switching valve 15 . The

passages

27 and 28 pass through the outside of the housing 43 of the heat pump device 2 and the outside of the housing 44 of the tank unit 3 . The installation location of the heat pump device 2 may be distant from the installation location of the tank unit 3 . The passage 29 connects the c port of the flow switching valve 15 to the inlet of the primary flow passage 12 a of the water heat exchanger 12 .

The

passages

30 and 31 connect the heating device 24 to the tank unit 3 . The passage 30 connects the d port of the flow switching valve 15 to the heat medium inlet of the heating device 24 . The passage 31 connects the heat medium outlet of the heating device 24 to the branch portion 25 .

The discharge temperature sensor 32 is arranged in the refrigerant pipe between the compressor 4 and the heat medium heat exchanger 5 . The discharge temperature sensor 32 can detect the compressor discharge temperature, which is the temperature of the refrigerant discharged from the compressor 4 .

A hot water storage temperature sensor 35 is provided in the hot water storage tank 11 . A hot water temperature sensor 35 detects the water temperature in the hot water tank 11 . The position where the stored hot water temperature sensor 35 is arranged is a position higher than the outflow port 17 and lower than the inflow port 18 .

In the following description, the temperature of the heat medium flowing into the secondary flow path 5b of the heat medium heat exchanger 5 is referred to as the "heat pump inlet temperature", and the temperature of the heat medium flowing out of the secondary flow path 5b is referred to as the "heat pump outlet temperature. ”.

The heat pump device 2 further includes a heat pump inlet temperature sensor 37 , a heat pump outlet temperature sensor 38 and an outside air temperature sensor 41 . A heat pump inlet temperature sensor 37 installed in the passage 27 detects the heat pump inlet temperature. A heat pump outlet temperature sensor 38 installed in the passageway 28 senses the heat pump outlet temperature. The outside air temperature sensor 41 detects the outside air temperature, which is the temperature of the outdoor air.

In the present disclosure, the temperature of water flowing out from the outlet 17 of the hot water storage tank 11 to the water feed passage 19 is referred to as "tank outflow temperature". The tank outflow temperature corresponds to the temperature of the water flowing into the secondary flow path 12 b of the water heat exchanger 12 . A tank outflow temperature sensor 39 installed in the water feed passage 19 detects the tank outflow temperature.

In the present disclosure, the temperature of water flowing into the hot water storage tank 11 from the inlet 18 through the water return passage 20 is referred to as "tank inflow temperature". The tank inflow temperature corresponds to the temperature of water flowing out from the secondary flow path 12 b of the water heat exchanger 12 to the water return path 20 . A tank inflow temperature sensor 40 installed in the water return passage 20 detects the tank inflow temperature.

In this embodiment, the hot water storage tank 11 has an uppermost portion 42 . The uppermost portion 42 corresponds to a portion of the hot water storage tank 11 higher than the inlet 18 . The inlet of the hot water supply pipe 23 is located within the uppermost portion 42 . The hot water supply pipe 23 is configured to take out the hot water in the uppermost portion 42 . Hot water in the uppermost portion 42 is supplied to the outside through the hot water supply pipe 23 .

In the illustrated example, the second controller 16 is arranged inside the housing 44 of the tank unit 3 . As a modification, the second controller 16 may be arranged outside the housing 44 , or the second controller 16 may be provided integrally with the heat pump device 2 .

The first controller 9 and the second controller 16 are connected by wire or wirelessly so as to be capable of bidirectional data communication. The first controller 9 and the second controller 16 correspond to control circuits that control the operation of the hot water supply system 1 . At least one of the first controller 9 and the second controller 16 may have a timer function for managing time. At least one of the first controller 9 and the second controller 16 may have a calendar function for managing dates.

In this embodiment, the first controller 9 and the second controller 16 cooperate to control the operation of the hot water supply system 1 . The present disclosure is not limited to a configuration in which a plurality of controllers work together to control the operation of the hot water supply system 1 as in the illustrated example, but a configuration in which the operation of the hot water supply system 1 is controlled by a single controller. may

The hot water supply system 1 of the present embodiment includes a remote controller 50 . The remote control 50 and the second controller 16 are connected by wire or wirelessly so as to be capable of bidirectional data communication. The remote control 50 may be installed in the room. The remote controller 50 has a function of receiving user's operations related to operation commands, setting value changes, and others. The remote control 50 corresponds to a human interface. Although not shown, the remote control 50 may include a display for displaying information about the state of the hot water supply system 1, an operation unit such as a switch operated by the user, a speaker, a microphone, and the like. Hot water supply system 1 may include a plurality of remote controllers 50 installed at different locations.

Instead of or in addition to the remote control 50, a mobile terminal such as a smart phone or a tablet terminal may be configured to be used as a human interface of the hot water supply system 1. In the following description, an example in which the remote control 50 is used as a representative of the human interface will be mainly described, but in the present disclosure, any processing using the remote control 50 can be replaced with processing using the mobile terminal. .

FIG. 2 is a functional block diagram of hot water supply system 1 according to Embodiment 1. As shown in FIG. As shown in FIG. 2, the compressor 4, the expansion valve 6, the blower 10, the discharge temperature sensor 32, the heat pump inlet temperature sensor 37, the heat pump outlet temperature sensor 38, and the outside air temperature sensor 41 are each connected to the first controller 9. are electrically connected to each other. Each of the heat medium pump 13, the water pump 14, the channel switching valve 15, the stored hot water temperature sensor 35, the tank outflow temperature sensor 39, and the tank inflow temperature sensor 40 is electrically connected to the second controller 16. there is

Each function of the first controller 9 may be realized by a processing circuit. The processing circuitry of the first controller 9 may comprise at least one processor 9a and at least one memory 9b. The at least one processor 9a may realize each function of the first controller 9 by reading and executing a program stored in at least one memory 9b. The processing circuitry of the first controller 9 may comprise at least one piece of dedicated hardware.

Each function of the second controller 16 may be realized by a processing circuit. The processing circuitry of the second controller 16 may comprise at least one processor 16a and at least one memory 16b. The at least one processor 16a may implement each function of the second controller 16 by reading and executing a program stored in the at least one memory 16b. The processing circuitry of the second controller 16 may comprise at least one piece of dedicated hardware.

The first controller 9 can control the rotational speed of the compressor 4 to be variable, for example, by inverter control. The first controller 9 corresponds to compressor control means for adjusting the rotational speed of the compressor 4 .

The second controller 16 may be able to control the rotation speed of the heat medium pump 13 to be variable, for example, by inverter control. The second controller 16 may be capable of controlling the rotation speed of the water pump 14 to be variable, for example, by inverter control.

The hot water supply system 1 can execute hot water storage operation. The hot water storage operation is an operation for increasing the temperature of the water in the hot water storage tank 11 . The first controller 9 and the second controller 16 control the hot water storage operation. The first controller 9 and the second controller 16 control operations during the hot water storage operation as follows. Compressor 4, heat medium pump 13, and water pump 14 are driven. In the channel switching valve 15, port a communicates with port c, and port d is closed. The high-temperature and high-pressure refrigerant compressed by the compressor 4 flows into the primary flow path 5 a of the heat medium heat exchanger 5 . The coolant flowing through the primary flow path 5a is cooled by the heat medium flowing through the secondary flow path 5b. The refrigerant that has passed through the primary flow path 5a is decompressed by the expansion valve 6 to become a low-temperature, low-pressure refrigerant. This low-temperature, low-pressure refrigerant flows into the evaporator 7 . In the evaporator 7, heat is exchanged between the outside air guided by the blower 10 and the low-temperature, low-pressure refrigerant. The refrigerant is evaporated by being heated by the outside air in the evaporator 7 . The evaporated refrigerant is sucked into the compressor 4 . Thus, a refrigeration cycle is formed.

The heat medium heated by the refrigerant in the heat medium heat exchanger 5 flows through the passage 28, the flow path switching valve 15, and the passage 29 into the primary flow path 12a of the water heat exchanger 12. The heat medium that has passed through the primary flow path 12 a returns to the heat medium heat exchanger 5 through the passage 26 , the branch portion 25 , the heat medium pump 13 and the passage 27 . A circuit in which the heat medium circulates through the heat medium heat exchanger 5 and the water heat exchanger 12 in this manner is hereinafter referred to as a "heat medium circuit".

The water in the lower part of the hot water storage tank 11 passes through the outlet 17 and the water feed passage 19 and flows into the secondary flow path 12b of the water heat exchanger 12. In the water heat exchanger 12, the water flowing through the secondary flow path 12b is heated by the heat medium flowing through the primary flow path 12a. The heated water flows into the upper part of the hot water storage tank 11 through the water return passage 20 and the inlet 18 .

The second controller 16 makes the rotation speed of the water pump 14 relatively high so that the flow rate of water flowing through the water circuit 21 is relatively high. As a result, in the hot water storage tank 11, no temperature boundary layer is formed over the range from the height of the inlet 18 to which the water return passage 20 is connected to the height of the outlet 17 to which the water feed passage 19 is connected. , the water is heated to a substantially uniform temperature. Also, the hot water that has flowed into the hot water storage tank 11 through the water return passage 20 and the inlet 18 rises to a position higher than the inlet 18 due to buoyancy. As a result, the entire water in the hot water storage tank 11 is heated to a substantially uniform temperature. However, when hot water with a temperature higher than that of the water heated by the water heat exchanger 12 remains in the uppermost portion 42 of the hot water storage tank 11 , the hot water may continue to remain in the uppermost portion 42 .

From the start of the hot water storage operation to the completion of the hot water storage operation, the temperature of the heat medium flowing through the heat medium circuit rises continuously. From the start of the hot water storage operation to the completion of the hot water storage operation, the temperature of the water flowing through the water circuit 21 rises continuously.

The first controller 9 may adjust the degree of opening of the expansion valve 6 so that the compressor discharge temperature detected by the discharge temperature sensor 32 becomes equal to a predetermined temperature. As the opening degree of the expansion valve 6 increases, the refrigerant flow rate increases and the compressor discharge temperature decreases.

The second controller 16 may fix the rotation speed of the heat medium pump 13 at a rotation speed that makes the flow rate of the heat medium flowing through the heat medium circuit equal to a predetermined value. Alternatively, the second controller 16 controls the heat medium so that the difference between the heat pump outlet temperature detected by the heat pump outlet temperature sensor 38 and the heat pump inlet temperature detected by the heat pump inlet temperature sensor 37 is equal to the target temperature difference. The rotation speed of the pump 13 may be adjusted.

The second controller 16 may fix the rotation speed of the water pump 14 at a rotation speed that makes the flow rate of water flowing through the water circuit 21 equal to a predetermined value. Alternatively, the second controller 16 controls the water pump so that the difference between the tank inflow temperature detected by the tank inflow temperature sensor 40 and the tank outflow temperature detected by the tank outflow temperature sensor 39 is equal to the target temperature difference. 14 rotation speed may be adjusted.

For example, a plate heat exchanger may be used as the water heat exchanger 12. A plate heat exchanger has a structure that facilitates heat transfer. Therefore, when a plate heat exchanger is used as the water heat exchanger 12, the difference between the temperature of the heat medium flowing through the primary flow path 12a and the temperature of the water flowing through the secondary flow path 12b is made smaller. This makes it possible to carry out more efficient hot water storage operation.

Next, the heating operation of the hot water supply system 1 will be explained. The first controller 9 and the second controller 16 control heating operation. The first controller 9 and the second controller 16 control operations during heating operation as follows. Compressor 4 and heat medium pump 13 are driven. Water pump 14 is stopped. In the channel switching valve 15, port a communicates with port d, and port c is closed. The operation of the heat pump device 2 is the same as or similar to that during the hot water storage operation. The heat medium heated by the refrigerant in the heat medium heat exchanger 5 passes through the passage 28 , the flow switching valve 15 and the passage 30 and flows into the heating device 24 . The heating device 24 heats the room using the heat of the heat medium. The temperature of the heat medium decreases while passing through the heating device 24 . The heat medium whose temperature has decreased returns to the heat medium heat exchanger 5 through the passage 31 , the branch portion 25 , the heat medium pump 13 and the passage 27 . A circuit in which the heat medium circulates through the heat medium heat exchanger 5 and the heating device 24 in this manner is hereinafter referred to as a "heating circuit".

In the present embodiment, switching between the heating circuit and the heat medium circuit by means of the channel switching valve 15 enables switching between the heating operation and the hot water storage operation. Therefore, the channel switching valve 15 corresponds to a switching valve that switches between the heating operation and the hot water storage operation.

FIG. 3 is a diagram showing the heat pump device 2 according to Embodiment 1 and the hot water supply system 1 including the same. In the example shown in FIG. 3, the hot water supply system 1 is configured by connecting the same heat pump device 2 as in FIG. 1 to a tank unit 45 different from the tank unit 3 in FIG. In the following, the tank unit 45 will be described with a focus on differences from the tank unit 3, and descriptions of common points will be simplified or omitted.

The tank unit 45 does not include the water heat exchanger 12, the water pump 14, the water circuit 21, the tank outflow temperature sensor 39, and the tank inflow temperature sensor 40. The tank unit 45 includes a water heat exchanger 46 arranged inside the hot water storage tank 11 . A heat medium pipe 47 of the water heat exchanger 46 has a shape wound in a helical shape or a coil shape around the central axis of the hot water storage tank 11 . The water heat exchanger 46 is submerged in the hot water tank 11 . Regarding the position in the vertical direction, the center of the water heat exchanger 46 is located lower than the center of the hot water storage tank 11 .

The water heat exchanger 46 has an inlet 48 and an outlet 49 . The inlet 48 is positioned higher than the outlet 49 . The inlet passage 51 connects the c port of the flow switching valve 15 to the inlet 48 of the water heat exchanger 46 . An outlet passage 52 connects the outlet 49 of the water heat exchanger 46 to the branch 25 .

In the illustrated example, the heat medium pipes 47 of the water heat exchanger 46 are arranged without being in contact with the inner wall surface of the hot water storage tank 11 . As a modification, the heat medium pipe 47 of the water heat exchanger 46 may be in contact with the inner wall surface of the hot water storage tank 11 .

During the hot water storage operation using the tank unit 45, the heat medium heated by the heat medium heat exchanger 5 of the heat pump device 2 passes through the passage 28, the flow path switching valve 15, the inlet passage 51, and the inlet 48 to become water. It flows into the heat medium tube 47 of the heat exchanger 46 . The heat medium that has passed through the heat medium pipe 47 of the water heat exchanger 46 returns to the heat medium heat exchanger 5 through the outlet 49 , the outlet passage 52 , the branch portion 25 , the heat medium pump 13 and the passage 27 . In the water heat exchanger 46, heat is exchanged between the heat medium flowing through the heat medium pipes 47 and the water in the hot water storage tank 11 that is in contact with the outer wall of the heat medium pipes 47. heated. When the water in contact with the outer wall of the heat medium pipe 47 is heated, it rises due to buoyancy. As a result, a circulating flow is formed inside the hot water storage tank 11 by natural convection. Therefore, as in the case of the tank unit 3, the entire water in the hot water storage tank 11 is heated to a substantially uniform temperature. However, when high-temperature hot water remains in the uppermost portion 42 of the hot water storage tank 11 , the high-temperature hot water may continue to remain in the uppermost portion 42 .

In the following description, the heat transfer performance of a water heat exchanger that exchanges heat between the heat medium and the water stored in the hot water storage tank 11, such as the water heat exchanger 12 or the water heat exchanger 46, is simply It is sometimes called "heat transfer performance".

The heat transfer performance of the water heat exchanger 46 of the tank unit 45 is lower than the heat transfer performance of the water heat exchanger 12 of the tank unit 3 . The main reason for this is that the water in the water heat exchanger 12 undergoes forced convection, whereas the water in the water heat exchanger 46 undergoes natural convection. In the present disclosure, heat transfer performance can be represented by, for example, an AK value. The AK value is a value obtained by multiplying the heat transfer area A [m ² ] by the heat transfer coefficient K [kW/(m ² K)]. Heat transfer performance is determined by the structure of the water heat exchanger.

Due to the difference in heat transfer performance described above, the efficiency of the hot water storage operation using the tank unit 45 is lower than the efficiency of the hot water storage operation using the tank unit 3. On the other hand, since the tank unit 45 does not require the water pump 14 and the water circuit 21, it has the advantage of being cheaper than the tank unit 3.

A user of the hot water supply system 1 or a builder who installs the hot water supply system 1 may combine the tank unit 3 with the heat pump device 2 from the viewpoint of emphasizing the efficiency of the hot water storage operation. On the other hand, the user or installer may combine the tank unit 45 with the heat pump device 2 from the viewpoint of reducing the installation cost. Thus, the heat pump device 2 may be used in combination with the tank unit 3 having the water heat exchanger 12 with relatively high heat transfer performance, or may be used in combination with the water heat exchanger 12 with relatively low heat transfer performance. It may be used in combination with a tank unit 45 having an exchanger 46 .

When the stored hot water temperature detected by the stored hot water temperature sensor 35 reaches the target temperature, the hot water storage operation is terminated. The time required for the hot water storage operation is the time from the start of the hot water storage operation until the stored hot water temperature detected by the stored hot water temperature sensor 35 reaches the target temperature.

Assuming that the rotational speed of the compressor 4 during the hot water storage operation is the same, the time required for the hot water storage operation using the tank unit 45 having the water heat exchanger 46 with low heat transfer performance is It is longer than the time required for the hot water storage operation using the tank unit 3 having the heat exchanger 12 .

In order to prevent the hot water storage tank 11 from running out of hot water during the heating operation, the hot water supply system 1 may temporarily suspend the heating operation, perform the hot water storage operation, and resume the heating operation as soon as the hot water storage operation ends. be. The longer the time required for the hot water storage operation, the longer the period during which the heating operation is suspended. Since heat is not supplied to the heating device 24 while the heating operation is suspended, the temperature of the room decreases. Therefore, it is not preferable that the hot water storage operation takes a long time.

The heat pump device 2 of the present embodiment includes heat transfer performance determination means for determining heat transfer performance. The heat transfer performance determination means in this embodiment is achieved by the first controller 9 . The heat transfer performance determining means may determine whether the heat transfer performance is high or low compared to a reference.

The first controller 9 determines the rotation speed of the compressor 4 when the heat transfer performance determining means determines that the heat transfer performance is relatively low, and the rotational speed of the compressor 4 when the heat transfer performance determining means determines that the heat transfer performance is relatively high. The rotation speed of the compressor 4 during the hot water storage operation is adjusted so as to be higher than the rotation speed of the compressor 4. - 特許庁As a result, the time required for the hot water storage operation using the tank unit 45 having the water heat exchanger 46 with low heat transfer performance is reduced to the time required for the hot water storage operation using the tank unit 3 having the water heat exchanger 12 with high heat transfer performance. You can avoid being longer than time. Therefore, even when the tank unit 45 having the water heat exchanger 46 with low heat transfer performance is combined with the heat pump device 2, it is possible to avoid an increase in the interruption period of the heating operation.

The rotational speed of the compressor 4 during the hot water storage operation may be kept constant or may vary. The average value of the rotation speed of the compressor 4 from the start to the end of the hot water storage operation is called "average rotation speed of the compressor 4". When the rotation speed of the compressor 4 fluctuates during the hot water storage operation, the first controller 9 adjusts the average rotation speed of the compressor 4 when the heat transfer performance determination means determines that the heat transfer performance is relatively low. However, the rotational speed of the compressor 4 during the hot water storage operation may be adjusted so as to be higher than the average rotational speed of the compressor 4 when the heat transfer performance determination means determines that the heat transfer performance is relatively high. .

In the present embodiment, the heat transfer performance determination means of the first controller 9 measures the time required for the hot water storage operation when the hot water storage operation is performed, and determines the heat transfer performance according to the measured required time. do. Thereby, the heat transfer performance determining means can accurately and easily determine the heat transfer performance.

In the present embodiment, when hot water storage operation is performed for the first time after hot water supply system 1 is installed, the heat transfer performance determination means of first controller 9 measures the time required for hot water storage operation, and according to the measured required time, to determine the heat transfer performance. Then, the hot water supply system 1 performs the second and subsequent hot water storage operations as normal hot water storage operations. During the normal hot water storage operation, the first controller 9 determines the heat transfer performance when the rotational speed of the compressor 4 is relatively high when the heat transfer performance determination means determines that the heat transfer performance is relatively low. The rotational speed of the compressor 4 is adjusted so that it is higher than the rotational speed of the compressor 4 determined by the means.

FIG. 4 is a flowchart showing an example of processing executed by the hot water supply system 1 when selecting the hot water storage operation mode. The hot water supply system 1 executes the process of the flowchart of FIG. 4, for example, when the stored hot water temperature detected by the stored hot water temperature sensor 35 is lower than a predetermined value. In step S101, the second controller 16 determines whether there is a history of completing the hot water storage operation in the past. If there is no record of completion of the hot water storage operation in the past, since this is the first time, the process proceeds to step S102 and the first hot water storage operation is performed. If there is a history of completing the hot water storage operation in the past, since this is not the first time, the process proceeds to step S103 and the normal hot water storage operation is performed.

FIG. 5 is a flowchart showing an example of processing executed by the hot water supply system 1 during the initial hot water storage operation. When the first hot water storage operation is started, the first controller 9 sets the rotation speed of the compressor 4 to an initial value in step S201.

At step S202, the second controller 16 sets the target hot water storage temperature Thw. The target stored hot water temperature Thw may be a value set by the user using the remote controller 50 .

In step S203, the hot water temperature sensor 35 detects the water temperature Tcw of the hot water storage tank 11 before the hot water storage operation is started. In the present embodiment, the water temperature Tcw of the hot water storage tank 11 before the start of the hot water storage operation corresponds to the "first temperature". The target stored hot water temperature Thw corresponds to the "second temperature".

At step S204, counting is started to measure the time required for the hot water storage operation. At step S205, the hot water storage operation is performed. In step S206, it is determined whether or not the stored hot water temperature detected by the stored hot water temperature sensor 35 has reached the target stored hot water temperature Thw. If the stored hot water temperature detected by the stored hot water temperature sensor 35 has not yet reached the target stored hot water temperature Thw, the hot water storage operation is continued.

When the stored hot water temperature detected by the stored hot water temperature sensor 35 reaches the target stored hot water temperature Thw, the process proceeds to step S207 to end the hot water storage operation. At step S208, the counting for measuring the time required for the hot water storage operation ends. Subsequently, in step S209, the standard hot water storage operation time is calculated.

Here, an example of how the first controller 9 calculates the standard hot water storage operation time will be described using FIG. As described above, the temperature of the water in the hot water storage tank 11, that is, the stored hot water temperature rises continuously from the start to the end of the hot water storage operation. FIG. 6 is a diagram showing the relationship between the continuously rising stored hot water temperature and the heating capacity [W] of the heat pump device 2 at that time. The heating capacity [W] of the heat pump device 2 is the amount of heat given to the heat medium by the heat pump device 2 per unit time. FIG. 6 shows the relationship when the rotational speed of the compressor 4 is kept constant. When the rotational speed of the compressor 4 is kept constant, the heating capacity gradually decreases as the stored hot water temperature rises.

In FIG. 6, the stored hot water temperature is equally divided into four sections, section 1 to section 4, from the assumed minimum temperature Tts to the assumed maximum temperature Tte. Let Q1 be the heating capacity at the intermediate stored hot water temperature Tt1 in section 1 . Let Q2 be the heating capacity at the intermediate stored hot water temperature Tt2 in section 2 . Let Q3 be the heating capacity at the intermediate stored hot water temperature Tt3 in section 3 . Let Q4 be the heating capacity at the intermediate stored hot water temperature Tt4 in section 4 .

The first controller 9 stores in advance the relationship between the stored hot water temperature and the heating capacity as shown in FIG. The relationship between the stored hot water temperature and the heating capacity actually changes continuously, but when the first controller 9 performs calculations, it may be a discrete value. For example, in section 2 where the stored hot water temperature is from Tt1-2 to Tt2-3, the representative value of the stored hot water temperature is Tt2 and the heating capacity is Q2.

In section 2, the heating amount H2 [J] for the hot water storage tank 11 required for the stored hot water temperature to rise from Tt1-2 to Tt2-3 is the water amount Mw [kg] in the hot water storage tank 11 and the water specific heat Cpw [J/kgK], it can be calculated by the following formula (1).

　H2=Mw×Cpw×("Tt2-3"-"Tt1-2") (1)

Other sections can be calculated in the same way. Further, when the water temperature Tcw of the hot water storage tank 11 before the hot water storage operation is in the interval 1, the heating amount H1 in the interval 1 can be calculated by the following equation (2).

　　H1=Mw×Cpw×("Tt1-2"-Tcw) (2)

Also, when the target hot water storage temperature Thw is in interval 4, the heating amount H4 in interval 4 can be calculated by the following equation (3).

　H4=Mw×Cpw×(Thw-"Tt3-4") (3)

In this way, the amount of heat required to heat the water in the hot water storage tank 11 from the water temperature Tcw to the target hot water storage temperature Thw is divided and calculated for each section. By dividing the calculated required heating amount by the heating capacity, the time required to heat the water in the hot water storage tank 11 from the water temperature Tcw to the target hot water storage temperature Thw can be calculated. Therefore, the hot water storage operation time thu required for heating the water in the hot water storage tank 11 from the water temperature Tcw before the hot water storage operation to the target hot water storage temperature Thw can be calculated by the following equation (4).

thu=H1/Q1+H2/Q2+H3/Q3+H4/Q4 (4)

The above required hot water storage operation time thu corresponds to the standard hot water storage operation time. Here, the relationship between the stored hot water temperature and the heating capacity shown in FIG. 6 is a numerical value when the tank unit 3 having the water heat exchanger 12 with relatively high heat transfer performance is used. Therefore, the standard hot water storage operation time thu is a numerical value when the tank unit 3 having the water heat exchanger 12 with relatively high heat transfer performance is used. The standard hot water storage operation time thu is an example of the standard required time.

When the standard hot water storage operation time thu is calculated as described above, the process proceeds from step S209 in FIG. 5 to step S210. In step S210, the heat transfer performance determination means of the first controller 9 compares the required hot water storage operation time measured by the processing from steps S204 to S208 with the standard hot water storage operation time thu calculated in step S209. The fact that the required hot water storage operation time is longer than the standard hot water storage operation time thu corresponds to relatively low heat transfer performance. If the required hot water storage operation time is longer than the standard hot water storage operation time thu, the process proceeds to step S211. In step S211, the first controller 9 sets the rotation speed of the compressor 4 during the normal hot water storage operation to be performed next time onwards to a value obtained by adding a predetermined value to the initial value set in step S201.

The fact that the required hot water storage operation time is equal to or less than the standard hot water storage operation time thu corresponds to relatively high heat transfer performance. If the required hot water storage operation time is equal to or shorter than the standard hot water storage operation time thu, the process proceeds to step S212. In step S212, the first controller 9 maintains the rotation speed of the compressor 4 during the normal hot water storage operation to be performed next time and thereafter, at the initial value set in step S201.

In the processing of steps S211 and S212, the rotation speed of the compressor 4 when the heat transfer performance determination means determines that the heat transfer performance is relatively low in the normal hot water storage operation after the second time is relatively high. This corresponds to adjusting the rotation speed of the compressor 4 so as to be higher than the rotation speed of the compressor 4 when the heat transfer performance determination means determines that the rotation speed of the compressor 4 is higher.

Note that the first controller 9 may change the initial value of the rotation speed of the compressor 4 set in step S201 according to the outside air temperature detected by the outside air temperature sensor 41 .

The first controller 9 may change the rotational speed of the compressor 4 according to the stored hot water temperature detected by the stored hot water temperature sensor 35 during the hot water storage operation. For example, the rotational speed of the compressor 4 may be increased continuously or stepwise as the stored hot water temperature rises. At that time, the first controller 9 determines that the rotational speed of the compressor 4 when the heat transfer performance is relatively low is determined to be relatively high at each time point during the hot water storage operation. The rotation speed of the compressor 4 may be adjusted so as to be higher than the rotation speed of the compressor 4 when it is determined.

During the hot water storage operation, the first controller 9 performs compression so that the difference between the heat pump outlet temperature detected by the heat pump outlet temperature sensor 38 and the stored hot water temperature detected by the stored hot water temperature sensor 35 becomes equal to the target temperature difference. It may be configured to adjust the rotational speed of the machine 4 . The rotation speed of the compressor 4 increases as the target temperature difference increases. Therefore, the first controller 9 sets the target temperature difference when it is determined that the heat transfer performance is relatively low to be larger than the target temperature difference when it is determined that the heat transfer performance is relatively high. , the target temperature difference may be set. Thus, the first controller 9 does not have to control the rotational speed value of the compressor 4 itself. That is, the rotation speed of the compressor 4 when the heat transfer performance is determined to be relatively low is compared with the rotation speed of the compressor 4 when the heat transfer performance is determined to be relatively high. It should be higher.

To equalize the time required for the hot water storage operation using the water heat exchanger 46 with low heat transfer performance to the time required for the hot water storage operation using the water heat exchanger 12 with high heat transfer performance, the heat pump outlet temperature and the hot water storage temperature need to increase the difference between In the present embodiment, during the second and subsequent normal hot water storage operations, the rotational speed of the compressor 4 when it is determined that the heat transfer performance is low is the rotational speed when it is determined that the heat transfer performance is relatively high. Since it is higher than the rotation speed of the compressor 4, the difference between the heat pump outlet temperature and the stored hot water temperature becomes large. Therefore, even when the tank unit 45 having the water heat exchanger 46 with low heat transfer performance is connected to the heat pump device 2, it is possible to prevent the time required for the hot water storage operation from being extended. Therefore, it is possible to avoid the interruption period of the heating operation from becoming longer.

In this embodiment, the rotation speed of the compressor 4 during the hot water storage operation can be automatically and appropriately adjusted according to the heat transfer performance of the water heat exchanger of the tank unit connected to the heat pump device 2. . Therefore, the heat pump device 2 can easily be combined with a plurality of types of tank units having different heat transfer performances of water heat exchangers. At the time of installation, there is no need to make special adjustments to the heat pump device 2 according to the type of tank unit.

A tank unit of a type in which water is circulated by a water pump 14 in a water circuit 21, which is a circulation circuit that connects the water heat exchanger 12 arranged outside the hot water storage tank 11 to the hot water storage tank 11, is hereinafter referred to as an "external heat exchange type." . The tank unit 3 of FIG. 1 corresponds to the external heat exchange type.

The type of tank unit in which the heat medium pipe 47 of the water heat exchanger 46 is arranged inside the hot water storage tank 11 is hereinafter referred to as the "inner coil type". The tank unit 45 in FIG. 3 corresponds to the inner coil type.

Although not shown, there is also a type of tank unit in which the heat medium pipes of the water heat exchanger are in contact with the outer wall of the hot water storage tank 11. Such a tank unit is hereinafter referred to as an "outer coil type". In the outer coil type tank unit, the heat medium pipe of the water heat exchanger is wound around the outer periphery of the hot water storage tank 11 in a helical or coiled manner. The wall of the hot water storage tank 11 is heated by the heat of the heat medium flowing through the heat medium pipes that are in contact with the outer wall of the hot water storage tank 11 . Heat is transferred from the inner wall of the hot water storage tank 11 to the water in contact with the inner wall, thereby heating the water in the hot water storage tank 11 . Water in contact with the inner wall of the hot water storage tank 11 is heated and floats, thereby generating natural convection. The heat pump device 2 of the present embodiment can also be used by being connected to an outer coil type tank unit. The heat transfer performance determining means of the first controller 9 can also determine the heat transfer performance of the water heat exchanger of the outer coil type tank unit.

In the present embodiment, the initial value of the rotational speed of the compressor 4 in step S201 is set to a relatively low value, and when it is determined that the heat transfer performance is low, in step S211, the rotational speed of the compressor 4 is reduced to I am trying to increase it. Since the initial value of the rotation speed of the compressor 4 is set to a relatively low value in this way, it is possible to more reliably prevent the heat pump outlet temperature from becoming too high during the first hot water storage operation. Therefore, it is possible to more reliably prevent the operation of the control for protecting the product, such as the forced stop of the heat pump device 2, during the first hot water storage operation.

Embodiment 2.
Next, the second embodiment will be described with reference to FIGS. 7 and 8. The description will focus on the differences from the above-described first embodiment, and the common description will be simplified or omitted. Moreover, the same code|symbol is attached|subjected to the element which is common with the element mentioned above, or corresponds.

In this embodiment, the heat transfer performance determination means of the heat pump device 2 presents a plurality of options regarding the type of tank unit through a human interface. A user of the hot water supply system 1 or a builder who constructs the hot water supply system 1 selects an option corresponding to the tank unit to be constructed from among the presented options. The heat transfer performance determination means determines heat transfer performance according to the selected option. The human interface may be, for example, the remote control 50 or a mobile terminal. As described above, the heat transfer performance is determined by the structure of the water heat exchanger. Therefore, by allowing the user or the builder to select the type of tank unit, the heat transfer performance determining means can determine the heat transfer performance without measuring the time required for the hot water storage operation.

The plurality of options presented by the heat transfer performance determination means are selected from options indicating an external heat exchange type tank unit, options indicating an inner coil type tank unit, and options indicating an outer coil type tank unit. Contains at least two options. The external heat exchange type corresponds to the first type. The inner coil type corresponds to the second type. The outer coil type corresponds to the third type.

As described above, the heat transfer performance of the inner coil type water heat exchanger 46 like the tank unit 45 is lower than the heat transfer performance of the external heat exchange type water heat exchanger 12 like the tank unit 3 . Further, the heat transfer performance of the water heat exchanger of the outer coil type tank unit is generally lower than that of the water heat exchanger of the inner coil type tank unit due to its structure.

The heat transfer performance determining means of the heat pump device 2 determines that the external heat exchange type has the highest heat transfer performance, determines that the inner coil type has the second highest heat transfer performance, and determines that the outer coil type has the highest heat transfer performance. determined to be the lowest. Thereby, the heat transfer performance determining means can accurately determine the heat transfer performance according to the type of tank unit selected by the user or the builder.

The first controller 9 controls the rotational speed of the compressor 4 during the hot water storage operation when the inner coil type option is selected, and the compressor 4 during the hot water storage operation when the external heat exchange type option is selected. higher than the rotation speed of In addition, the first controller 9 sets the rotational speed of the compressor 4 during the hot water storage operation when the outer coil type option is selected, to the compressor speed during the hot water storage operation when the inner coil type option is selected. Make it higher than the rotation speed of 4.

The heat transfer performance determination means of the heat pump device 2 may display icons corresponding to each of the multiple options on the display 53 of the human interface when presenting multiple options regarding the type of tank unit. FIG. 7 is a diagram showing a display example of icons on the display 53. As shown in FIG. The display 53 may be, for example, the display section of the remote controller 50 or the display section of the portable terminal. Display 53 may be a touch screen.

In the example shown in FIG. 7, the display 53 displays an icon 54 indicating options for the external heat exchange type, an icon 55 indicating options for the inner coil type, and a message 56 "Please select a tank type." ing. The icon 54 corresponds to a pictogram showing the structure in which the water heat exchanger 12 is arranged outside the hot water storage tank 11 . The icon 55 corresponds to a pictogram showing the structure in which the heat medium pipes 47 of the water heat exchanger 46 are arranged inside the hot water storage tank 11 . Although illustration is omitted, the display 53 may further display an icon indicating options for the outer coil type using pictograms.

In the example shown in FIG. 7 , a left selection button 57 , a right selection button 58 , an enter button 59 , and a selection indicator 60 are additionally displayed on the display 53 . The user or builder touches the left selection button 57 or the right selection button 58 to move the position of the selected indicia 60 left or right. When the decision button 59 is touched while the mark 60 being selected is overlaid on the icon 54 or the icon 55, the selection is confirmed.

In this embodiment, the display 53 displays the

icons

54 and 55 corresponding to a plurality of options regarding the type of tank unit, so that the user or the builder can select the type of tank unit to be constructed. You can quickly understand the right options.

The heat transfer performance determining means of the heat pump device 2 causes the display 53 to display the icon 54 and the icon 55 corresponding to each of the plurality of options regarding the tank unit type when presenting the plurality of options regarding the tank unit type. Alternatively, the name corresponding to each of the plurality of options may be displayed on the display 53 . Alternatively, both the

icons

54 and 55 and their corresponding names may be displayed on the display 53 .

FIG. 8 is a flowchart showing an example of processing executed by the hot water supply system 1 in the second embodiment. In the present embodiment, hot water supply system 1 executes the process of the flowchart of FIG. 8, for example, when the stored hot water temperature detected by stored hot water temperature sensor 35 is lower than a predetermined value. In other words, the hot water supply system 1 executes the process of the flowchart of FIG. 8 before starting the hot water storage operation. In step S301, the second controller 16 determines whether there is a history of completing the hot water storage operation in the past. In step S301, if there is a history of completion of the hot water storage operation in the past, it is considered that selection of the tank unit type has already been completed. In this case, the process proceeds to step S303, the hot water supply system 1 ends the process of this flowchart, and performs the hot water storage operation.

If it is determined in step S301 that there is no history of completion of the hot water storage operation in the past, it is considered that this is the first hot water storage operation and the tank unit type has not yet been selected. In this case, the process proceeds to step S302, and hot water supply system 1 causes display 53 to display icon 54 and icon 55 corresponding to each of a plurality of options regarding the type of tank unit.

The process proceeds from step S302 to step S304, and the user or builder selects an icon corresponding to the type of tank unit to be constructed. When the inner coil type icon 55 is selected, the heat transfer performance determining means determines that the heat transfer performance of the water heat exchanger is relatively low. In this case, the process proceeds to step S305. In step S305, the first controller 9 sets the rotation speed of the compressor 4 during the hot water storage operation to a value obtained by adding a predetermined value to the initial value. The initial value is the same as the initial value set in step S201 of FIG. After that, the hot water supply system 1 performs the hot water storage operation according to the set rotational speed of the compressor 4 .

When the external heat exchange type icon 54 is selected, the heat transfer performance determination means determines that the heat transfer performance of the water heat exchanger is relatively high. In this case, the process proceeds to step S306. In step S306, the first controller 9 maintains the rotational speed of the compressor 4 during the hot water storage operation at the initial value. After that, the hot water supply system 1 performs the hot water storage operation according to the rotational speed of the compressor 4 maintained at the initial value.

In the processing of steps S305 and S306, the rotational speed of the compressor 4 when the heat transfer performance determination means determines that the heat transfer performance is relatively low is relatively high, and the heat transfer performance determination means determines that the heat transfer performance is relatively high. This corresponds to the first controller 9 adjusting the rotational speed of the compressor 4 during the hot water storage operation so that it becomes higher than the rotational speed of the compressor 4 in this case.

It should be noted that, among the features of the above-described multiple embodiments, two or more features that can be combined may be combined for implementation.

1 hot water system, 2 heat pump device, 3 tank unit, 4 compressor, 5 heat medium heat exchanger, 5a primary flow path, 5b secondary flow path, 6 expansion valve, 7 evaporator, 9 first controller, 9a processor, 9b memory, 10 blower, 11 hot water storage tank, 12 water heat exchanger, 12a primary flow path, 12b secondary flow path, 13 heat medium pump, 14 water pump, 15 flow switching valve, 16 second controller, 16a processor, 16b Memory, 17 Outlet, 18 Inlet, 19 Passage, 20 Passage, 21 Water circuit, 22 Water supply pipe, 23 Hot water supply pipe, 24 Heating device, 25 Branch, 26 Passage, 27 Passage, 28 Passage, 29 Passage, 30 Passage, 31 Passage, 32 Discharge temperature sensor, 35 Hot water storage temperature sensor, 37 Heat pump inlet temperature sensor, 38 Heat pump outlet temperature sensor, 39 Tank outflow temperature sensor, 40 Tank inflow temperature sensor, 41 Outside air temperature sensor, 42 Top, 43 Housing body, 44 housing, 45 tank unit, 46 water heat exchanger, 47 heat medium tube, 48 inlet, 49 outlet, 50 remote controller, 51 inlet passage, 52 outlet passage, 53 display, 54 icon, 55 icon, 56 message, 57 Left selection button, 58 Right selection button, 59 Decision button

Claims

A heat pump device for supplying the heat medium to a tank unit having a water heat exchanger that exchanges heat between the heat medium and water stored in a hot water storage tank,
a compressor that compresses a refrigerant;
a heat medium heat exchanger that exchanges heat between the refrigerant and the heat medium;
heat transfer performance determination means for determining the heat transfer performance of the water heat exchanger;
Compressor control means for adjusting the rotation speed of the compressor during hot water storage operation, which is an operation for increasing the temperature of water in the hot water storage tank;
with
The compressor control means controls the rotation speed of the compressor when the heat transfer performance of the water heat exchanger is relatively low is determined to be relatively high when the heat transfer performance of the water heat exchanger is relatively high. A heat pump device that adjusts the rotational speed of the compressor during the hot water storage operation so as to be higher than the rotational speed of the compressor in the determined case.
2. The heat transfer performance determination means according to claim 1, wherein the heat transfer performance determination means measures the time required for the hot water storage operation when the hot water storage operation is performed, and determines the heat transfer performance according to the measured time required. heat pump equipment.
The heat transfer performance determination means measures the time required for the hot water storage operation when the hot water storage operation for increasing the temperature of water in the hot water storage tank from a first temperature to a second temperature is performed, and measures the time required for the hot water storage operation. The heat transfer performance is calculated by calculating the standard required time for the hot water storage operation to raise the temperature of the water from the first temperature to the second temperature, and comparing the measured required time with the standard required time. The heat pump device of claim 1, wherein the heat pump device determines.
2. The heat transfer performance determining means presents a plurality of options regarding the type of the tank unit through a human interface, and determines the heat transfer performance according to an option selected from the plurality of options. A heat pump device as described.
5. The heat pump device according to claim 4, wherein when presenting the plurality of options, the heat transfer performance determination means displays icons corresponding to each of the plurality of options on the display of the human interface.
The plurality of options are a first type tank unit that circulates water by a pump in a circulation circuit that connects the water heat exchanger arranged outside the hot water storage tank to the hot water storage tank, and the water heat. A second type of tank unit in which the heat medium pipes of the exchanger are arranged inside the hot water tank, and a second type in which the heat medium pipes of the water heat exchanger are in contact with the outer wall of the hot water tank. 6. A heat pump apparatus according to claim 4 or 5, comprising at least two options among options indicating three types of said tank units.
The heat transfer performance determination means determines that the heat transfer performance of the first type is the highest among the first type, the second type, and the third type, and the heat transfer performance of the second type is determined to be the highest. 7. The heat pump device according to claim 6, wherein the heat transfer performance is determined to be the next highest, and the heat transfer performance of the third type is determined to be the lowest.