WO2018207278A1

WO2018207278A1 - Heat pump device

Info

Publication number: WO2018207278A1
Application number: PCT/JP2017/017653
Authority: WO
Inventors: 和希外川
Original assignee: 三菱電機株式会社
Priority date: 2017-05-10
Filing date: 2017-05-10
Publication date: 2018-11-15
Also published as: JPWO2018207278A1; JP6732117B2

Abstract

This heat pump device is provided with: a heat collection circuit in which an underground heat refrigerant is circulated inside heat collection piping; a heat pump circuit in which a heat pump refrigerant is circulated inside heat pump piping; and a heat exchanger that performs heat exchange between the underground heat refrigerant and the heat pump refrigerant, wherein the heat collection circuit has an underground heat exchanger which is formed by burying a portion of the heat collection piping under the ground and collects underground heat. The heat pump circuit has: a compressor which is connected to the heat pump piping and compresses the heat pump refrigerant; a control box in which electronic components for controlling the compressor are mounted, and which has a rear surface to which the heat collection piping is joined; and a fan which blows a flow of air onto the rear surface of the control box.

Description

Heat pump equipment

The present invention relates to a heat pump device using underground heat.

Conventionally, a method using geothermal heat is known as a method for cooling control electronic components for controlling the output of a compressor in a heat pump system using geothermal heat (for example, Patent Document 1). This heat pump system includes a heat collecting circuit that collects underground heat, a heat pump circuit that is arranged in parallel with the heat collecting circuit, and an air conditioning circuit that is arranged in parallel with the heat pump circuit and performs indoor air conditioning.

The heat collecting circuit includes a first heat exchanger that performs heat exchange with the heat pump refrigerant. The heat pump circuit includes a compressor that compresses the heat pump refrigerant, a first heat exchanger that exchanges heat with the underground heat refrigerant, a second heat exchanger that exchanges heat with the air conditioning refrigerant, and a second heat exchange. And an expansion valve provided between the compressor and the first heat exchanger, and a control electronic component for controlling the compressor.

In such a heat pump system, during operation, the output of the compressor is controlled by inverter control, and the control electronic component at that time is accompanied by heat generation, so it is necessary to cool the control electronic component. The control electronic component is joined to a heat collecting circuit located on the upstream side of the first heat exchanger via a heat sink, and is cooled by the heat of the underground heat refrigerant flowing through the heat collecting pipe penetrating through the fin of the heat sink.

JP 2005-30708 A

However, the heat collecting tube in the heat pump system described in Patent Document 1 may have a dew point temperature lower than the temperature inside the apparatus. In such a case, dew condensation water is generated, and the generated dew condensation water may be constantly generated during operation. For this reason, there has been a problem that the generated condensed water may fall on the part or flow out of the device, leading to failure of the device and complaints.

This invention is made in view of the subject in the said prior art, Comprising: It aims at providing the heat pump apparatus which can suppress generation | occurrence | production of dew condensation water, cooling the electronic component for control.

The heat pump device of the present invention includes a heat collection circuit in which a ground heat refrigerant circulates in the heat collection pipe, a heat pump circuit in which a heat pump refrigerant circulates in the heat pump pipe, the ground heat refrigerant, and the heat pump refrigerant. A heat pump device including a heat exchanger for exchanging heat with the heat collecting circuit, wherein the heat collecting circuit is configured with a part of the heat collecting pipe embedded in the ground, The heat pump circuit includes an underground heat exchanger for collecting heat, the heat pump circuit is connected to the heat pump pipe, and includes a compressor for compressing the refrigerant for the heat pump, and an electronic component for controlling the compressor. And a control box having the heat collecting pipe joined to the rear surface thereof, and a fan for blowing an airflow to the rear surface of the control box.

As described above, according to the present invention, the heat collecting pipe is joined to the back surface of the control box, and the air current of the fan is blown to the back surface of the control box, thereby cooling the control electronic components and generating dew condensation water. Can be suppressed.

It is the schematic which shows an example of a structure of the heat pump apparatus which concerns on Embodiment 1. FIG. It is a block diagram which shows an example of a structure of the control apparatus of FIG. It is the schematic for demonstrating the relationship between the control box of FIG. 1, and piping. It is the schematic for demonstrating the installation position of the fan with respect to the control box of FIG. 3 is a flowchart illustrating an example of a flow of fan rotation speed control processing in the heat pump device according to the first embodiment. It is the schematic which shows an example of a structure of the heat pump apparatus which concerns on Embodiment 2. FIG. It is the schematic which shows the mode of the back surface of the control box of FIG. It is a block diagram which shows an example of a structure of the control apparatus of FIG. 6 is a flowchart illustrating an example of a flow of fan rotation speed control processing in the heat pump device according to the second embodiment.

Embodiment 1 FIG.
Hereinafter, the heat pump apparatus according to Embodiment 1 of the present invention will be described. The heat pump device according to Embodiment 1 collects ground heat and performs air conditioning and hot water supply using the collected ground heat.

[Circuit configuration of heat pump device]
FIG. 1 is a schematic diagram illustrating an example of the configuration of the heat pump device 100 according to the first embodiment. As shown in FIG. 1, the heat pump device 100 includes a heat collection circuit 1, a heat pump circuit 2, an air conditioning circuit 3, a hot water supply circuit 4, and a control device 7.

(Heat collection circuit)
The heat collecting circuit 1 includes a first heat exchanger 5, a ground heat exchanger 11, a first circulation pump 12, a first temperature thermistor 13 as a first temperature sensor, and a second temperature thermistor 14 as a second temperature sensor. The ground heat exchanger 11 is used to collect the ground heat. In the heat collecting circuit 1, the first heat exchanger 5, the underground heat exchanger 11, and the first circulation pump 12 are annularly connected by the heat collecting pipe 10, and the inside of the heat collecting pipe 10 is a refrigerant for underground heat. Circulates.

The underground heat exchanger 11 is configured, for example, such that a part of the heat collecting pipe 10 is formed in a U shape and is embedded vertically or horizontally in the ground. The underground heat exchanger 11 collects underground heat by circulating an underground heat refrigerant inside. The first circulation pump 12 is driven by a motor (not shown) and circulates the underground heat refrigerant.

The first heat exchanger 5 performs heat exchange between the underground heat refrigerant flowing through the heat collecting circuit 1 and the heat pump refrigerant flowing through the heat pump circuit 2 described later. The first heat exchanger 5 heats or cools the heat pump refrigerant with the heat of the underground heat refrigerant.

The first temperature thermistor 13 is installed in the vicinity of the heat collecting pipe 10 and measures the temperature of the underground heat refrigerant flowing through the heat collecting pipe 10. The second temperature thermistor 14 is installed inside the heat pump apparatus 100 and measures the temperature inside the heat pump apparatus 100. The second temperature thermistor 14 may be installed at any position as long as the temperature in the heat pump apparatus 100 can be measured, but is preferably installed in the vicinity of the control box 23 of the heat pump circuit 2 described later.

(Heat pump circuit)
The heat pump circuit 2 includes a compressor 21, a decompression device 22, a first heat exchanger 5, a second heat exchanger 6, a control box 23, and a fan 24. In the heat pump circuit 2, the first heat exchanger 5, the compressor 21, the second heat exchanger 6, and the decompression device 22 are connected in a ring shape by the heat pump pipe 20, and the heat pump refrigerant circulates inside the heat pump pipe 20. .

The compressor 21 sucks the low-temperature and low-pressure refrigerant, compresses the sucked refrigerant, and discharges it in a high-temperature and high-pressure state. The compressor 21 includes, for example, an inverter compressor that controls a capacity that is a refrigerant delivery amount per hour by arbitrarily changing a drive frequency. The decompression device 22 decompresses and expands the refrigerant. The decompression device 22 is configured by a valve capable of controlling the opening, such as an electronic expansion valve.

The second heat exchanger 6 exchanges heat between the heat pump refrigerant flowing through the heat pump circuit 2 and a heat medium flowing through the air conditioning circuit 3 described later. The second heat exchanger 6 heats or cools the heat medium with the heat of the heat pump refrigerant.

The control box 23 is equipped with control electronic components for controlling the compressor 21 and is connected to the control device 7 described later. The back surface of the control box 23 is joined to the upstream side of the first heat exchanger 5 in the heat collecting pipe 10 of the heat collecting circuit 1. Details of the structure of the control box 23 will be described later. The fan 24 is driven by a motor (not shown) and is installed so as to blow an airflow on the back surface of the control box 23.

(Air conditioning circuit)
The air conditioning circuit 3 includes a second heat exchanger 6, a flow path switching valve 31, a radiator 32, and a second circulation pump 33. In the air conditioning circuit 3, the second heat exchanger 6, the flow path switching valve 31, the radiator 32, and the second circulation pump 33 are annularly connected by the air conditioning pipe 30, and water circulates inside the air conditioning pipe 30.

The flow path switching valve 31 is, for example, an electromagnetic three-way valve, and has one inflow port and two outflow ports. The flow path switching valve 31 switches the flow path when the outlet is selected to supply the heat medium flowing into the inflow port to either the radiator 32 of the air conditioning circuit 3 or the hot water supply circuit 4.

The heat radiator 32 is mainly installed in the air-conditioning target space, and radiates the heat of the heat medium to perform air conditioning of the air-conditioning target space. The second circulation pump 33 is driven by a motor (not shown) to circulate the heat medium.

(Hot water supply circuit)
The hot water supply circuit 4 includes a hot water supply tank 41, a third circulation pump 42, and a third heat exchanger 43. In the hot water supply circuit 4, one outlet of the flow path switching valve 31 in the air conditioning circuit 3 and the air conditioning pipe 30 through which the heat medium flowing out from the radiator 32 flows are connected by a hot water supply pipe 40 a through a third heat exchanger 43. Has been. Moreover, the hot water supply tank 41, the 3rd circulation pump 42, and the 3rd heat exchanger 43 are connected cyclically | annularly by the hot water supply piping 40b.

The hot water supply tank 41 is supplied with water heated by a third heat exchanger 43 described later, and stores this water. The third circulation pump 42 is driven by a motor (not shown) to circulate water.

The hot water supply tank 41 is supplied with tap water or the like from the outside through a water supply pipe (not shown), and flows the supplied tap water or the like out to supply it to the third circulation pump 42. The heated water stored in the hot water supply tank 41 is discharged to the outside through a hot water pipe (not shown) and used as hot water for a shower or the like.

The third heat exchanger 43 performs heat exchange between the heat medium flowing through the hot water supply circuit 4 via the air conditioning circuit 3 and the water flowing out of the hot water supply tank 41. The second heat exchanger 6 heats water with the heat of the heat medium.

(Control device)
The control device 7 controls the overall operation of the heat pump device 100 based on various information received from each part of the heat pump device 100, for example. For example, the control device 7 controls the compressor frequency of the compressor 21 and the switching of the flow path of the flow path switching valve 31 based on information from various sensors (not shown) provided in the heat pump apparatus 100. In the first embodiment, the control device 7 controls the rotation speed of the fan 24 based on the temperatures measured by the first temperature thermistor 13 and the second temperature thermistor 14. Details of such control of the fan 24 will be described later.

Such a control device 7 includes, for example, software executed on a computing device such as a microcomputer or a CPU (Central Processing Unit), and hardware such as a circuit device that realizes various functions.

FIG. 2 is a block diagram showing an example of the configuration of the control device 7 of FIG. As shown in FIG. 2, the control device 7 includes a pump state determination unit 71, a temperature difference calculation unit 72, a fan rotation number determination unit 73, a storage unit 74, and a fan control unit 75. In FIG. 2, only functional blocks for portions related to the features of the present invention are illustrated, and illustration and description of other portions are omitted.

The pump state determination unit 71 receives drive information related to the first circulation pump 12. As the drive information, for example, information obtained from a motor (not shown) that drives the first circulation pump 12 can be used. The pump state determination unit 71 determines whether or not the first circulation pump 12 is driven based on the input drive information, and supplies information indicating the obtained determination result to the fan rotation number determination unit 73. .

The temperature difference calculation unit 72 receives data indicating the temperature of the underground heat refrigerant by the first temperature thermistor 13 and data indicating the temperature in the heat pump device 100 by the second temperature thermistor 14. The temperature difference calculation unit 72 calculates a temperature difference based on the two input measurement data, and supplies information indicating the obtained temperature difference to the fan rotation speed determination unit 73.

The fan rotation speed determination unit 73 receives information indicating the determination result obtained by the pump state determination unit 71 and information indicating the temperature difference calculated by the temperature difference calculation unit 72. The fan rotation speed determination unit 73 determines the rotation speed of the fan 24 by referring to a rotation speed table stored in advance in the storage unit 74 described later based on the two pieces of input information. Then, the fan rotation speed determination unit 73 supplies information indicating the determined rotation speed of the fan 24 to the fan control unit 75.

The storage unit 74 stores programs and data necessary for control performed by the control device 7 in advance. For example, the storage unit 74 stores in advance a rotation speed table used by the fan rotation speed determination unit 73.

The rotation speed table is a table in which the temperature difference calculated by the temperature difference calculation unit 72 is associated with the rotation speed of the fan 24. Specifically, the calculated temperature difference is divided into a plurality of stages, and the rotation speed of the fan 24 is associated with each divided stage.

At this time, the temperature difference is associated with the rotation speed so that the rotation speed of the fan 24 increases as the temperature difference increases. This is because as the temperature difference is larger, the temperature measured by the first temperature thermistor 13 is lower than the dew point temperature, and there is a high possibility that the environment is likely to condense, and it is necessary to increase the air volume to the heat collecting pipe 10. It is.

The information indicating the rotation speed of the fan 24 is input to the fan control unit 75. The fan control unit 75 generates a control signal for controlling the rotational speed of the fan 24 based on the input information indicating the rotational speed of the fan 24 and supplies the control signal to the fan 24.

[Piping connection structure to the control box and fan installation position]
Next, the joining structure of the heat collecting pipe 10 of the heat collecting circuit 1 to the control box 23 and the installation position of the fan 24 will be described. FIG. 3 is a schematic diagram for explaining the relationship between the control box 23 and the heat collecting pipe 10 in FIG. 1.

As described above, the back surface of the control box 23 is joined to the heat collecting pipe 10 on the upstream side of the first heat exchanger 5 in the heat collecting circuit 1. As shown in FIG. 3, among the heat collecting pipes 10 in the heat collecting circuit 1, the heat collecting pipe 10 joined to the control box 23 communicates a pair of header pipes 10a provided in parallel with each other and the header pipes 10a. And a plurality of branch pipes 10b.

In this way, the portion of the heat collecting pipe 10 to be joined to the back surface of the control box 23 is formed by a pair of header pipes 10a and a plurality of branch pipes 10b, so that the heat collecting pipe 10 is joined as it is. Thus, the contact area between the back surface of the control box 23 and the heat collecting pipe 10 can be increased. Therefore, the cooling effect on the control box 23 by the underground heat refrigerant flowing through the heat collecting pipe 10 can be increased.

Further, by forming the heat collecting pipe 10 in this way, for example, in order to increase the contact area, one heat collecting pipe 10 is formed to meander and is compared with the case where it is joined to the back surface of the control box 23. Thus, the flow path can be shortened. Therefore, the pressure loss due to the heat collecting pipe 10 can be reduced.

Thus, during operation of the heat pump device 100, the control box 23 can be cooled by circulating the underground heat refrigerant through the heat collecting pipe 10. In addition to this, when the control box 23 is cooled, the underground heat refrigerant absorbs heat, whereby the underground heat refrigerant can be heated. Therefore, the efficiency by the 1st heat exchanger 5 located in the downstream rather than the position where the control box 23 was installed can be improved.

FIG. 4 is a schematic diagram for explaining the installation position of the fan 24 with respect to the control box 23 of FIG. As shown in FIG. 4, the fan 24 is installed so that airflow can be blown to the back surface of the control box 23.

The fan 24 is further provided close to the pair of header pipes 10a and the plurality of branch pipes 10b. Thereby, an airflow can be sprayed with respect to the header pipe 10a and the branch pipe 10b, and the dew condensation water which generate | occur | produces from the header pipe 10a and the branch pipe 10b can be suppressed.

Condensed water is moisture in the air that has been cooled to the dew point temperature or lower. Therefore, by blowing an air current, the atmosphere can be replaced before moisture in the atmosphere is precipitated, and as a result, the generation of condensed water can be suppressed.

Further, by simultaneously blowing airflow to the back surface of the control box 23, the pair of header pipes 10a, and the plurality of branch pipes 10b, the condensation of the heat collecting pipe 10 is reduced and the back surface of the control box 23 by forced convection, A cooling effect can be expected for the control electronic components mounted on the PC.

Note that the fan 24 may be installed at any position as long as it can blow airflow over the entire back surface of the control box 23. In addition, the fan 24 is preferably small if it has an ability to suppress dew condensation from the viewpoint of power consumption. Furthermore, the shape of the heat collecting pipe 10 joined to the back surface of the control box 23 is not limited to this example, and may be any shape as long as it can be cooled.

[Operation of heat pump device]
Next, operation | movement of the heat pump apparatus 100 which has the said structure is demonstrated, referring FIG. First, in the heat collecting circuit 1, when the first circulation pump 12 is operated, the underground heat refrigerant in the heat collecting pipe 10 circulates. The geothermal refrigerant collects geothermal heat in the geothermal heat exchanger 11.

The ground heat refrigerant obtained by collecting the ground heat is heat-exchanged with the heat pump refrigerant in the first heat exchanger 5 to heat and evaporate the heat pump refrigerant. The underground heat refrigerant circulates again in the heat collection pipe 10 and collects the underground heat in the underground heat exchanger 11.

Next, in the heat pump circuit 2, the heat pump refrigerant is compressed by the compressor 21 and discharged. The heat pump refrigerant discharged from the compressor 21 flows into the second heat exchanger 6. The heat pump refrigerant flowing into the second heat exchanger 6 heats the heat medium by exchanging heat with the heat medium in the air conditioning circuit 3 and condensing while radiating heat, and flows out from the second heat exchanger 6.

The heat pump refrigerant that has flowed out of the second heat exchanger 6 is depressurized and expanded by the decompression device 22, and flows out from the decompression device 22. The heat pump refrigerant flowing out from the decompression device 22 flows into the first heat exchanger 5.

The heat pump refrigerant that has flowed into the first heat exchanger 5 exchanges heat with the underground heat refrigerant, absorbs heat and evaporates, and flows out of the first heat exchanger 5. The heat pump refrigerant flowing out of the first heat exchanger 5 is sucked into the compressor 21. In the following, the heat pump refrigerant repeats the circulation described above.

Next, in the air conditioning circuit 3, the heat medium flowing through the air conditioning pipe 30 and heated by the second heat exchanger 6 flows into the radiator 32 through the flow path switching valve 31. The heat medium flowing into the radiator 32 radiates heat to the air in the air-conditioning target space and flows out of the radiator 32. Thereby, air conditioning of the air-conditioning target space is performed. The heat medium flowing out from the radiator 32 flows into the second heat exchanger 6 through the second circulation pump 33. Hereinafter, the heat medium flowing through the air conditioning pipe 30 repeats the circulation described above.

In the air conditioning circuit 3, the heat medium heated by the second heat exchanger 6 flows into the hot water supply circuit 4 through the flow path switching valve 31. The heat medium flowing into the hot water supply circuit 4 flows through the hot water supply pipe 40 a and flows into the third heat exchanger 43. The heat medium flowing into the third heat exchanger 43 exchanges heat with water circulating through the hot water supply pipe 40 b to dissipate heat and flows out from the third heat exchanger 43. The heat medium flowing out from the third heat exchanger 43 flows out from the hot water supply circuit 4 and flows into the air conditioning circuit 3, and merges with the heat medium flowing through the air conditioning pipe 30 of the air conditioning circuit 3.

On the other hand, the water in the hot water supply tank 41 flows out of the hot water supply tank 41 and flows into the third heat exchanger 43 through the third circulation pump 42. The water flowing into the third heat exchanger 43 exchanges heat with the heat medium flowing through the hot water supply pipe 40 a to absorb heat, and flows out from the third heat exchanger 43. The water that has flowed out of the third heat exchanger 43 flows into the hot water supply tank 41 and repeats the circulation described above.

[Fan control]
Next, a process for controlling the rotation speed of the fan 24 in the heat pump apparatus 100 according to the first embodiment will be described. In the first embodiment, when the temperature in the apparatus rises due to the operation of the heat pump apparatus 100, the rotation speed of the fan 24 is controlled so that the heat collecting pipe 10 of the heat collecting circuit 1 does not condense.

FIG. 5 is a flowchart showing an example of the flow of the rotational speed control process of the fan 24 in the heat pump apparatus 100 according to the first embodiment. Note that the process shown in FIG. 5 is repeated cyclically at a preset time.

First, in step S1, the pump state determination unit 71 of the control device 7 determines whether or not the first circulation pump 12 is in operation based on drive information input from a motor that drives the first circulation pump 12. To do.

When it is determined that the first circulation pump 12 is not in operation, that is, is stopped (step S1; NO), the fan rotation speed determination unit 73 sets the rotation speed of the fan 24 to “0” in order to stop the fan 24. To decide. In step S 6, the fan control unit 75 drives, i.e. stops, the fan 24 at the determined rotation speed “0”.

On the other hand, when it is determined that the first circulation pump 12 is in operation (step S1; YES), the process proceeds to step S2. In step S 2, the second temperature thermistor 14 measures the temperature in the heat pump device 100. In step S 3, the first temperature thermistor 13 measures the temperature of the underground heat refrigerant flowing in the heat collecting pipe 10 of the heat collecting circuit 1.

Note that the processing of step S2 and step S3 is not necessarily performed in the order described. For example, the order of the processes of step S2 and step S3 may be switched, and the processes of step S2 and step S3 may be performed in parallel.

Next, in step S4, the temperature difference calculation unit 72 calculates the temperature difference between the in-device temperature measured in step S2 and the underground heat refrigerant temperature measured in step S3. The fan rotational speed determination unit 73 refers to the rotational speed table stored in the storage unit 74 and determines the rotational speed of the fan 24 based on the calculated temperature difference. In step S5, the fan control unit 75 drives the fan 24 at the determined rotation speed.

As described above, the heat pump device 100 according to the first embodiment includes the heat collecting circuit 1 in which the underground heat refrigerant circulates in the heat collecting pipe 10 and the heat pump circuit in which the heat pump refrigerant circulates in the heat pump pipe 20. 2 and a first heat exchanger 5 that performs heat exchange between the underground heat refrigerant and the heat pump refrigerant. In such a heat pump device 100, the heat collecting circuit 1 has a ground heat exchanger 11 that heats the ground heat, which is configured with a part of the heat collecting pipe 10 buried in the ground. . In addition, the heat pump circuit 2 is connected to the heat pump pipe 20 and includes a compressor 21 that compresses the heat pump refrigerant, and an electronic component for controlling the compressor 21, and a control in which the heat collecting pipe 10 is joined to the back surface. A box 23 and a fan 24 that blows airflow against the back of the control box 23 are provided.

In this manner, the air flow is blown by the fan 24 against the back surface of the control box 23 to which the heat collecting pipe 10 is joined, so that the condensed water in the heat collecting pipe 10 is cooled while cooling the control electronic components of the control box 23. Can be suppressed.

In the first embodiment, the fan is based on the temperature difference between the temperature of the underground heat refrigerant measured by the first temperature thermistor 13 and the temperature in the heat pump device 100 measured by the second temperature thermistor 14. The rotational speed of 24 is controlled. Thereby, according to the temperature state of the heat pump apparatus 100, generation | occurrence | production of condensed water can be suppressed more appropriately.

Embodiment 2. FIG.
Next, a heat pump device according to Embodiment 2 of the present invention will be described. The heat pump device according to the second embodiment is different from the above-described first embodiment in that it includes a humidity sensor installed in the heat pump device 100 and a third temperature thermistor installed in the vicinity of the back surface of the control box 23. To do.

[Circuit configuration of heat pump device]
FIG. 6 is a schematic diagram illustrating an example of the configuration of the heat pump apparatus 100 according to the second embodiment. FIG. 7 is a schematic view showing the back surface of the control box 23 of FIG. As shown in FIG. 6, the heat pump device 100 according to the second embodiment is provided with a humidity sensor 15 in addition to the configuration of the heat pump device 100 according to the first embodiment. As shown in FIG. 7, a third temperature thermistor 16 as a third temperature sensor is provided in the vicinity of the back surface of the control box 23. In the following description, the same reference numerals are given to portions common to the first embodiment, and detailed description thereof is omitted.

The humidity sensor 15 is installed inside the heat pump apparatus 100 and measures the relative humidity in the heat pump apparatus 100. The humidity sensor 15 may be installed at any position as long as the relative humidity in the heat pump apparatus 100 can be measured, but is preferably installed in the vicinity of the control box 23.

The third temperature thermistor 16 is installed in the vicinity of the back surface of the control box 23 and measures the atmospheric temperature. Although the third temperature thermistor 16 is installed in the vicinity of the back surface of the control box 23, it is preferable that the third temperature thermistor 16 is installed so as not to be affected by heat generated by the substrate or the like mounted on the control box 23.

(Control device)
FIG. 8 is a block diagram showing an example of the configuration of the control device 7 of FIG. As shown in FIG. 8, the control device 7 includes a pump state determination unit 71, a dew point temperature calculation unit 76, a fan rotation speed determination unit 73, and a fan control unit 75. In FIG. 8, only functional blocks for portions related to the features of the present invention are illustrated, and illustration and description of other portions are omitted.

The dew point temperature calculation unit 76 includes data indicating the temperature of the refrigerant for geothermal heat by the first temperature thermistor 13, data indicating the temperature in the heat pump device 100 by the second temperature thermistor 14, and the heat pump device 100 by the humidity sensor 15. The data indicating the relative humidity of is input. The dew point temperature calculation unit 76 calculates the dew point temperature based on the three input measurement data, and supplies information indicating the obtained dew point temperature to the fan rotation number determination unit 73.

The fan rotational speed determination unit 73 includes information indicating the determination result obtained by the pump state determination unit 71, information indicating the dew point temperature calculated by the dew point temperature calculation unit 76, and the atmosphere measured by the third temperature thermistor 16. Data indicating temperature is input.
The fan rotation speed determination unit 73 determines the amount of change in the rotation speed of the fan 24 based on the input information. Then, the fan rotation speed determination unit 73 supplies information indicating the determined change amount of the rotation speed of the fan 24 to the fan control unit 75.

[Fan control]
Next, processing for controlling the rotation speed of the fan 24 in the heat pump apparatus 100 according to the second embodiment will be described.
FIG. 9 is a flowchart showing an example of the flow of the rotational speed control process of the fan 24 in the heat pump apparatus 100 according to the second embodiment. It is assumed that the process shown in FIG. 9 is cyclically repeated every preset time.

First, in step S 11, the pump state determination unit 71 of the control device 7 determines whether or not the first circulation pump 12 is in operation based on drive information input from a motor that drives the first circulation pump 12. To do.

When it is determined that the first circulation pump 12 is stopped (step S11; NO), the fan rotation speed determination unit 73 determines the rotation speed of the fan 24 to “0” in order to stop the fan 24. In step S 22, the fan control unit 75 stops the fan 24.

On the other hand, when it is determined that the first circulation pump 12 is in operation (step S11; YES), the process proceeds to step S12. In step S 12, the second temperature thermistor 14 measures the temperature inside the heat pump apparatus 100. In step S 13, the first temperature thermistor 13 measures the temperature of the underground heat refrigerant flowing in the heat collecting pipe 10 of the heat collecting circuit 1. Furthermore, in step S 14, the humidity sensor 15 measures the relative humidity in the heat pump device 100.

Note that the processing from step S12 to step S14 is not necessarily performed in the order described. For example, the order of the processes of step S2 and step S3 may be switched, and the processes of step S2 and step S3 may be performed in parallel.

Next, in step S15, the dew point temperature calculation unit 76 calculates the dew point temperature Tb based on the temperature and humidity data measured in steps S12 to S14. The dew point temperature Tb can be calculated based on the equations (1) to (3). The value “X” in the equation (1) is the relative humidity [%] in the heat pump apparatus 100 measured by the humidity sensor 15. The value “T ₁ ” is the temperature [° C.] in the heat pump apparatus 100 measured by the second temperature thermistor 14.
Tb = A × ln (X / 10) + B (1)
A = 0.13 × T ₁ +11.1 (2)
B = 0.7 × T ₁ −25 (3)

The calculation of the dew point temperature Tb using the equations (1) to (3) described above is applied when the relative humidity X [%] is “10 ≦ X ≦ 90”. When the relative humidity X [%] is “X <10”, the dew point temperature Tb is calculated based on the equations (1) to (3) on the assumption that the relative humidity X is the value “10”. Further, when the relative humidity X [%] is “90 <X”, the dew point temperature Tb is the temperature T ₁ in the heat pump device 100.

In step S16, the third temperature thermistor 16 measures the atmospheric temperature Ta. In step S17, the fan rotation speed determination unit 73 determines the amount of change in the rotation speed of the fan 24 based on the dew point temperature Tb calculated in step S15 and the atmospheric temperature Ta measured in step S16.

When the relationship between the atmospheric temperature Ta and the dew point temperature Tb is “atmospheric temperature Ta = dew point temperature Tb”, the fan rotational speed determination unit 73 maintains the rotational speed of the fan 24 at the current rotational speed in step S18. To decide. When the relationship between the atmospheric temperature Ta and the dew point temperature Tb is “atmospheric temperature Ta> dew point temperature Tb”, the fan rotational speed determination unit 73 determines to increase the rotational speed of the fan 24 in step S19. . Further, when the relationship between the atmospheric temperature Ta and the dew point temperature Tb is “atmospheric temperature Ta <dew point temperature Tb”, the fan rotational speed determination unit 73 determines to decrease the rotational speed of the fan 24 in step S20. . In step S 21, the fan control unit 75 supplies a control signal indicating the determined amount of change in the rotational speed to the fan 24 to drive the fan 24.

The rotational speed of the fan 24 may be changed stepwise, for example, and the target rotational speed is determined based on the surrounding environment and the calculated dew point temperature so that the rotational speed is immediately determined. Also good.

As described above, the heat pump device 100 according to the second embodiment includes the humidity sensor 15 and the third temperature thermistor 16 in addition to the configuration of the heat pump device 100 according to the first embodiment described above. Thereby, since the rotation speed of the fan 24 is controlled based on the relationship between atmospheric temperature and dew condensation temperature, generation | occurrence | production of dew condensation water can be suppressed more appropriately.

1 heat collection circuit, 2 heat pump circuit, 3 air conditioning circuit, 4 hot water supply circuit, 5 first heat exchanger, 6 second heat exchanger, 7 control device, 10 heat collection pipe, 10a header pipe, 10b branch pipe, 11 ground Medium heat exchanger, 12 1st circulation pump, 13 1st temperature thermistor, 14 2nd temperature thermistor, 15 humidity sensor, 16 3rd temperature thermistor, 20 heat pump piping, 21 compressor, 22 decompression device, 23 control box, 24 Fan, 30 air conditioning piping, 31 flow path switching valve, 32 radiator, 33 second circulation pump, 40a, 40b hot water supply piping, 41 hot water supply tank, 42 third circulation pump, 43 third heat exchanger, 71 pump state determination unit 72, temperature difference calculation unit, 73 fan speed determination unit, 74 storage unit, 75 fan control unit, 76 dew Temperature calculation unit, 100 a heat pump apparatus.

Claims

Heat exchanging between the heat collecting circuit in which the underground heat refrigerant circulates in the heat collecting pipe, the heat pump circuit in which the heat pump refrigerant circulates in the heat pump pipe, and the underground heat refrigerant and the heat pump refrigerant. A heat pump device configured to include a heat exchanger to perform,
The heat collecting circuit has a geothermal heat exchanger configured to collect underground heat, wherein a part of the heat collecting pipe is embedded in the ground.
The heat pump circuit is
A compressor connected to the heat pump piping and compressing the heat pump refrigerant;
Electronic box for controlling the compressor is mounted, and a control box in which the heat collecting pipe is joined to the back surface,
A heat pump device having a fan for blowing airflow to the back of the control box.
A control device for controlling the rotational speed of the fan;
The heat collecting circuit is:
A first temperature sensor provided in the vicinity of the heat collecting pipe and measuring a temperature of the underground heat refrigerant flowing in the heat collecting pipe;
A second temperature sensor for measuring the temperature in the heat pump device,
The heat pump device according to claim 1, wherein the control device controls the number of rotations of the fan based on a temperature of the underground heat refrigerant and a temperature in the heat pump device.
The control device controls the number of rotations of the fan based on a temperature difference between the temperature of the geothermal refrigerant and the temperature in the heat pump device so that the number of rotations increases as the temperature difference increases. The heat pump apparatus according to claim 2.
The heat collection circuit further includes a humidity sensor that measures relative humidity in the heat pump device,
The heat pump circuit further includes a third temperature sensor for measuring the atmospheric temperature,
The control device includes:
The rotation speed of the fan according to claim 2, wherein the number of revolutions of the fan is controlled based on a relationship between a temperature of the ground heat refrigerant, a temperature in the heat pump device, a dew point temperature obtained from the relative humidity, and the atmospheric temperature. Heat pump device.
The control device includes:
When the atmospheric temperature and the dew point temperature are equal, the rotational speed of the fan is maintained,
If the atmospheric temperature is greater than the dew point temperature, increase the rotational speed of the fan,
The heat pump device according to claim 4, wherein when the atmospheric temperature is lower than the dew point temperature, the rotational speed of the fan is decreased.
The heat pump device according to any one of claims 1 to 5, wherein the control box has the heat collecting pipe on the upstream side of the heat exchanger joined to a back surface.
The heat collection pipe joined to the control box is formed by a pair of parallel header pipes and a plurality of branch pipes communicating the pair of header pipes. The heat pump apparatus as described.