WO2023190574A1

WO2023190574A1 - Heat pump device

Info

Publication number: WO2023190574A1
Application number: PCT/JP2023/012634
Authority: WO
Inventors: 太貴島野; 将弘近藤; 和樹須田
Original assignee: 株式会社富士通ゼネラル
Priority date: 2022-03-31
Filing date: 2023-03-28
Publication date: 2023-10-05
Also published as: JP2023151441A

Abstract

This heat pump device comprises: a heat source machine that generates hot water using a heat source; a radiant terminal; a forced convection terminal; and a control device. The radiant terminal is connected to the heat source machine, and adjusts the temperature of the indoor space with radiant heat obtained by flowing hot water from the heat source machine into a radiant panel. The forced convection terminal is connected to the heat source machine, flows the hot water from the heat source machine into a user-side heat exchanger, and adjust the temperature of the indoor space by blowing out air that has been heat-exchanged with the hot water in the user-side heat exchanger by means of a blower fan. The control device controls the heat source machine, the radiant terminal, and the forced convection terminal. The control device includes a control unit that controls the forced convection terminal to reduce the airflow of the forced convection terminal compared to the airflow when only the forced convection terminal is operated, when the radiant terminal and the forced convection terminal are operated at the same time. Provided is a heat pump device capable of suppressing a deterioration in user comfort.

Description

heat pump equipment

The present invention relates to a heat pump device.

For example, a heat pump device is known that heats an indoor space in which an indoor terminal is installed by flowing hot water generated by a heat source device to an indoor terminal. Indoor terminals include, for example, forced convection type terminals that adjust indoor temperature by forced convection from the indoor terminal, and radiation type terminals that adjust indoor temperature using radiant heat of hot water passing through the indoor terminal.

When performing heating operation using a forced convection terminal connected to a heat pump device, warm water is supplied to the user via indoor air, so the hot water temperature is raised to a higher temperature than when using a radiant terminal. There is a need to. Therefore, when performing heating operation using a forced convection terminal, user comfort is ensured by setting the target temperature so that the hot water temperature during heating is high.

JP 2019-70498 Publication

However, in conventional heat pump devices, when the forced convection type terminal and the radiant type terminal are operated at the same time, hot water having the same temperature as the hot water supplied to the forced convection type terminal is supplied to the radiant type terminal. As a result, the radiant terminal supplies hot water at a temperature that exceeds the temperature at which the user feels comfortable, which may make the user feel uncomfortable.

In view of such problems, the present invention aims to provide a heat pump device that can suppress a decrease in user comfort.

A heat pump device according to one embodiment includes a heat source device that generates hot water using a heat source, a radiant terminal, a forced convection terminal, and a control device. The radiant terminal is connected to the heat source device and adjusts the temperature of the indoor space using radiant heat obtained by flowing hot water from the heat source device into the radiant panel. The forced convection terminal is connected to a heat source device, causes the hot water from the heat source device to flow into the heat exchanger on the user side, and uses a blower fan to blow out the air that has exchanged heat with the hot water in the heat exchanger on the user side, thereby controlling the temperature of the indoor space. Adjust. The control device controls the heat source device, the radiation type terminal, and the forced convection type terminal. When the radiant terminal and the forced convection terminal are operated at the same time, the control device controls the forced convection terminal so that when the radiant terminal and the forced convection terminal are operated at the same time, the air volume of the forced convection terminal is lowered compared to the air volume when only the forced convection terminal is operated. It has a control section that controls.

One aspect is that it is possible to suppress a decline in user comfort.

FIG. 1 is an explanatory diagram showing an example of the heat pump device of this embodiment. FIG. 2 is an explanatory diagram showing an example of an air volume target value table stored in the storage unit. FIG. 3 is an explanatory diagram showing an example of the relationship between air conditioning capacity and the amount of circulating water. FIG. 4 is a flowchart showing an example of the processing operation of the control device related to temperature adjustment processing.

Hereinafter, embodiments of the heat pump device and the like disclosed in the present application will be described in detail based on the drawings. Note that the disclosed technology is not limited to this example. Further, each of the embodiments shown below may be modified as appropriate within a range that does not cause contradiction.

<Configuration of heat pump device>
FIG. 1 is an explanatory diagram showing an example of a heat pump device 1 of this embodiment. The heat pump device 1 shown in FIG. 1 includes a heat source device 2 that generates hot water, a user terminal group 3 including a plurality of user terminals 4, and a control device 5 that controls the entire heat pump device 1.

<Configuration of heat source machine>
The heat source device 2 has a heat source 20 that generates hot water. The heat source 20 has a refrigerant circuit 21 and a water circuit 22. The refrigerant circuit 21 is, for example, a circuit in which a refrigerant is circulated inside using a compressor, and heat is exchanged between the circulating refrigerant and outside air. Water circulates inside the water circuit 22, and hot water is generated by exchanging heat between the water circulating inside and the refrigerant circulating inside the refrigerant circuit 21. The water circuit 22 adjusts the temperature of the indoor space in which the user terminals 4 of the user terminal group 3 are arranged by, for example, flowing hot water into the user terminal group 3 using a circulation pump.

<Configuration of user terminal group>
The user terminal group 3 includes a plurality of user terminals 4, a branch pipe 31, and a merging pipe 32. Examples of the user terminal 4 installed in the indoor space include a radiation type terminal 4A and a forced convection type terminal 4B.

The radiant terminal 4A is, for example, a floor heating terminal, has a radiant panel 41A that is a user-side heat exchanger 41, is connected to a water circuit 22 in the heat source device 2, and supplies hot water from the water circuit 22 to the radiant panel 41A. The temperature of the indoor space is adjusted using the radiant heat obtained by flowing in the air.

The forced convection terminal 4B includes a user-side heat exchanger 41B (41), a blower fan 42, a fan control section 43, and a temperature sensor 44. The user-side heat exchanger 41B is connected to the water circuit 22 in the heat source device 2, hot water flows into the water circuit 22, and the air that has been heat-exchanged with the hot water in the user-side heat exchanger 41B is sent to the indoor space by the blower fan 42. Adjusts the temperature of the indoor space by blowing air. The blower fan 42 is a fan that generates forced convection. The fan control unit 43 controls the rotation speed of the blower fan 42 to adjust the air volume. The temperature sensor 44 is a sensor that is disposed at the inlet of the usage-side heat exchanger 41B and detects the temperature of hot water flowing into the usage-side heat exchanger 41B.

<Configuration of control device>
The control device 5 controls the heat source device 2, the radiation terminal 4A which is the user terminal 4, and the forced convection terminal 4B. The control device 5 includes a detection section 51, a storage section 52, and a control section 53. The detection unit 51 detects the current temperature of hot water generated by the heat source device 2. Specifically, the detection unit 51 detects the temperature of the hot water flowing into the user-side heat exchanger 41B from the temperature sensor 44 in the forced convection terminal 4B as the current temperature.

Conventionally, when the forced convection type terminal 4B and the radiant type terminal 4A are operated at the same time, the temperature of the hot water flowing into the forced convection type terminal 4B and the radiant type terminal 4A is higher than that when only the radiant type terminal 4A is used. I was doing it. This is because the forced convection type terminal 4B supplies heat to the user via indoor air, so the hot water temperature needs to be higher than when only the radiation type terminal 4A is used. As a result, hot water at the same temperature as the hot water supplied to the forced convection terminal 4B will be supplied to the radiant terminal 4A, and the temperature of the air that will be blown out unless the air flow rate of the forced convection terminal 4B is reduced (blowout temperature) drops significantly, causing discomfort to the user. Therefore, in this embodiment, attention is focused on reducing the amount of heat radiated from hot water to air by changing the air flow rate, and suppressing a decrease in the temperature of hot water. The amount of heat released from hot water to air per unit time can be calculated by air specific heat x air density x air flow rate x temperature difference. The temperature difference is (average temperature of hot water in the heat exchanger - air intake temperature). In other words, by reducing the air flow rate, which is the air flow rate, the amount of heat radiated from the hot water to the air per unit time becomes smaller, so the drop in the temperature of the hot water is also reduced. Therefore, even if the temperature of the hot water is the same, by reducing the air volume, the temperature blown out from the forced convection terminal 4B can be adjusted to an appropriate temperature.

FIG. 2 is an explanatory diagram showing an example of the air volume target value table stored in the storage unit 52. This air volume target value table is a table used when the radiation type terminal 4A and the forced convection type terminal 4B are operated at the same time. The storage unit 52 stores an air volume level that is a target value of the air volume of the forced convection terminal 4B according to the temperature level of the hot water. The temperature level of the hot water is the temperature of the hot water flowing into the user-side heat exchanger of the forced convection terminal 4B, that is, the level corresponding to the current temperature that is the detected value of the temperature sensor 44. There are three temperature levels for hot water: "High" where the current temperature is high, "Low" where the current temperature is low, and "Medium" where the current temperature is between the above-mentioned "High" and "Low". level. The air volume level is the air volume level of the forced convection type terminal 4B so that the user feels comfortable, depending on the temperature level of the hot water. There are also three levels of airflow: "Large" where the airflow is large, "Small" where the airflow is small, and "Medium" where the airflow is between the aforementioned "Large" and "Small".

When the temperature level of hot water is high, the air volume level of forced convection type terminal 4B is high; when the temperature level of hot water is medium, the air volume level of forced convection type terminal 4B is medium; when the temperature level of hot water is low, the air volume level of forced convection type terminal 4B is forced. The air volume level of the convection type terminal 4B is small. When the temperature level of hot water is high, the amount of decrease in air volume may be small in order to achieve a blowing temperature that does not make the user feel uncomfortable. On the other hand, when the temperature level of hot water is low, it is necessary to increase the amount of decrease in air volume so that the blowing temperature is such that the user does not feel uncomfortable. In this embodiment, the air volume level is set according to the three hot water temperature levels, but this is not the case as long as the air volume is assigned according to the hot water temperature and the lower the hot water temperature is, the lower the air volume is.

When the radiation type terminal 4A and the forced convection type terminal 4B are operated at the same time, the control unit 53 lowers the air volume of the forced convection type terminal 4B compared to the air volume when only the forced convection type terminal 4B is operated. The forced convection terminal 4B is controlled as follows. Specifically, when the radiation type terminal 4A and the forced convection type terminal 4B are operated at the same time, the control unit 53 stores an air volume level corresponding to the temperature level of the hot water detected by the detection unit 51. The forced convection type terminal 4B is read out from the unit 52 and is controlled so that the read air volume level is achieved.

After controlling the forced convection type terminal 4B to lower the air volume of the forced convection type terminal 4B, the control unit 53 controls the forced convection type terminal 4B and the radiation type terminal when the temperature of the indoor space of the forced convection type terminal 4B decreases. The heat source device 2 is controlled so that the flow rate of hot water to 4A increases. When the amount of heat radiated from hot water to the air is smaller than the amount of heat leaked from the walls, windows, doorways, etc. of the room, the temperature of the indoor space decreases. Therefore, even if the air outlet temperature can be set to a temperature that does not make the user feel uncomfortable, the user may feel uncomfortable due to a decrease in the temperature of the indoor space. Therefore, by controlling the heat source device 2 so that the flow rate of hot water to the forced convection type terminal 4B and the radiation type terminal 4A increases, the amount of heat radiated from the hot water to the air is increased, and the blowing temperature is raised.

FIG. 3 is an explanatory diagram showing an example of the relationship between air conditioning capacity and circulating water amount. As shown in FIG. 3, the air conditioning capacity of the forced convection terminal 4B increases as the circulating flow rate of hot water from the heat source device 2 increases.

<Operation of heat pump device>
FIG. 4 is a flowchart showing an example of the processing operation of the control device 5 related to temperature adjustment processing. In FIG. 4, the control device 5 determines whether the radiation terminal 4A is in operation (step S11). When the radiation type terminal 4A is in operation (step S11: Yes), the control device 5 determines whether the forced convection type terminal 4B is in operation (step S12).

When the forced convection terminal 4B is in operation (step S12: Yes), the control device 5 sets the temperature level of the hot water to the current temperature detected by the detection unit without changing the set temperature of the hot water (step S13). The air volume level, which is the air volume of the corresponding target value, is read from the storage unit 52 (step S14).

The control device 5 sets the air volume (air volume level) of the read target value to the forced convection type terminal 4B (step S15), and ends the processing operation shown in FIG. 4. That is, when the radiation type terminal 4A and the forced convection type terminal 4B are operated at the same time, the control device 5 reads the air volume level corresponding to the temperature level of the detected hot water temperature from the storage unit 52, and reads out the air volume level that corresponds to the temperature level of the detected hot water temperature. The forced convection type terminal 4B is controlled so that the level is maintained. As a result, while the radiation type terminal 4A maintains a temperature at which the user feels comfortable, the forced convection type terminal 4B can also suppress a decrease in user comfort.

If the radiation type terminal 4A is not in operation in step S11 (step S11: No), the control device 5 determines whether the forced convection type terminal 4B is in operation (step S16). When the forced convection terminal 4B is in operation (step S16: Yes), the control device 5 adjusts the set temperature of the hot water (step S17), and ends the processing operation shown in FIG. 4. That is, when only the forced convection terminal 4B is operated, the control device 5 controls the heat source device 2 to adjust the current hot water temperature without changing the normal air volume level. Specifically, in the refrigerant circuit 21, the rotation speed of the compressor is increased in order to increase the amount of heat exchange between the refrigerant and air, and between water and refrigerant. As a result, the forced convection terminal 4B can maintain a temperature that makes the user feel comfortable.

Further, if the forced convection terminal 4B is not in operation (step S16: No), the control device 5 ends the processing operation shown in FIG. 4. Further, if the forced convection terminal 4B is not in operation (step S12: No), the control device 5 ends the processing operation shown in FIG. 4.

<Effects of Examples>
In the heat pump device 1 of this embodiment, when the radiation type terminal 4A and the forced convection type terminal 4B are operated at the same time, the air volume level corresponding to the temperature level of the hot water detected by the detection unit 51 is stored in the storage unit. 52 and controls the forced convection type terminal 4B so that the read air volume level is achieved. As a result, while the radiation type terminal 4A maintains a temperature at which the user feels comfortable, the forced convection type terminal 4B can also suppress a decrease in user comfort. In other words, even when the temperature of the hot water is low, the air volume level of the forced convection terminal 4B is lowered to increase the blowout temperature, so it is possible to avoid a situation where the user's comfort is reduced even if the user is exposed to wind.

After controlling the forced convection terminal 4B to lower the air volume of the forced convection terminal 4B, the heat pump device 1 controls the forced convection terminal 4B and the radiation terminal when the temperature of the indoor space of the forced convection terminal 4B decreases. The heat source device 2 is controlled so that the flow rate of hot water to 4A increases. As a result, instead of lowering the air volume of the forced convection type terminal 4B, which is the amount of circulation on the air side, the blowout temperature is increased by increasing the flow rate, which is the amount of hot water circulated to the forced convection type terminal 4B and the radiation type terminal 4A. air conditioning capacity can be maintained.

For convenience of explanation, the control unit 53 stores the air volume level in the storage unit 52 in accordance with the temperature level of hot water detected by the detection unit 51 when the forced convection type terminal 4B and the radiation type terminal 4A are operated at the same time. , and the forced convection type terminal 4B is controlled so as to attain the read air volume level. However, the control unit 53 may control the forced convection terminal 4B to lower the air volume of the forced convection terminal 4B compared to the air volume when only the forced convection terminal 4B is operating. It can be changed as appropriate. As a result, while the radiation type terminal 4A maintains a temperature at which the user feels comfortable, the forced convection type terminal 4B can also suppress a decrease in user comfort. For example, by lowering the volume (wind speed) of air passing through the user-side heat exchanger 41B in the forced convection terminal 4B, the blowing temperature increases. In other words, comfort can be ensured because the temperature blown out from the forced convection terminal 4B can be adjusted without adjusting the temperature of hot water as in the prior art.

Further, each component of each part shown in the drawings does not necessarily have to be physically configured as shown in the drawings. In other words, the specific form of dispersion/integration of each part is not limited to what is shown in the diagram, but all or part of it may be functionally or physically distributed/integrated in arbitrary units depending on various loads, usage conditions, etc. can be configured.

Furthermore, various processing functions performed in each device can be performed in whole or in part on a CPU (Central Processing Unit) (or a microcomputer such as an MPU (Micro Processing Unit) or an MCU (Micro Controller Unit)). You may also choose to execute it. Further, various processing functions may be executed in whole or in part on a program that is analyzed and executed by a CPU (or a microcomputer such as an MPU or MCU) or on hardware using wired logic. Needless to say.

1 Heat pump device 2 Heat source device 4A Radiant terminal 4B Forced convection terminal 5 Control device 20 Heat source 41A Radiant panel 41B Usage side heat exchanger 51 Detection section 52 Storage section 53 Control section

Claims

a heat source machine that generates hot water using a heat source;
a radiant terminal that is connected to the heat source device and adjusts the temperature of the indoor space using radiant heat obtained by flowing the hot water from the heat source device into a radiant panel;
Connected to the heat source device, the hot water flows from the heat source device into the user-side heat exchanger, and the air that has been heat-exchanged with the hot water in the user-side heat exchanger is blown out by a blower fan, thereby controlling the temperature of the indoor space. a forced convection terminal that regulates;
a control device that controls the heat source device, the radiation type terminal, and the forced convection type terminal,
The control device includes:
When the radiation type terminal and the forced convection type terminal are operated at the same time, the forced convection type terminal is operated such that the air volume of the forced convection type terminal is lowered compared to the air volume when only the forced convection type terminal is operated. A heat pump device characterized by having a control unit that controls a terminal.
The control device includes:
a detection unit that detects the temperature of hot water generated by the heat source device;
a storage unit that stores a target value of air volume of the forced convection terminal according to the temperature of the hot water;
The control unit includes:
When the radiation type terminal and the forced convection type terminal are operating at the same time, the target value corresponding to the temperature of the hot water detected by the detection unit is read from the storage unit, and the target value is set to the read target value. The heat pump device according to claim 1, wherein the forced convection type terminal is controlled to.
The detection unit includes:
The heat pump device according to claim 2, wherein the temperature of the hot water flowing into the user-side heat exchanger is detected as the hot water generated by the heat source device.
The control unit includes:
After controlling the forced convection terminal to lower the air volume of the forced convection terminal, if the temperature in the indoor space of the forced convection terminal decreases, the flow of hot water to the forced convection terminal and the radiant terminal decreases. The heat pump device according to claim 1 or 2, wherein the heat source device is controlled so that the flow rate increases.