JP5524571B2 - Heat pump equipment - Google Patents

Description

  The present invention relates to a heat pump device that stabilizes the refrigerant temperature on the evaporation side of a heat pump circuit and performs load operation such as efficient heating.

  Conventionally, in this type of heat pump apparatus, as shown in FIG. 8, the heat pump unit 101 such as an air conditioner, a heat medium circulation type heat source unit 102, and a load heat exchange unit 103 are provided. A compressor 104, a load-side heat exchanger 105 as a condenser for circulating the high-pressure refrigerant discharged from the compressor 104 and exchanging heat with a load-side heat medium, an expansion valve 106 as a decompression means, and an expansion valve 106 A heat source side heat exchanger 107 as an evaporator that circulates the low-pressure refrigerant from the heat source and exchanges heat with an external heat medium, and the heat source unit 102 includes a heat source 108 that heats the refrigerant of the heat source side heat exchanger 107, and , A heat source side circulation circuit 109 that connects the heat source side heat exchanger 107 and the heat source 108 in a ring shape with a heat medium pipe, and a heat source side circulation circuit 109 that can circulate water or antifreeze as a heat medium. The heat source side circulation pump 110 and the heat source side forward temperature sensor 111 for detecting the temperature of the heat medium in the underground heat circulation circuit 109 flowing out from the heat source side heat exchanger 107 are also provided. A load terminal 112 such as a floor heating panel, a load-side circulation circuit 113 that connects the load-side heat exchanger 105 and the load terminal 112 in a circulatory manner, and a load-side circulation pump 114 that circulates a heat medium in the load-side circulation circuit 113 , A load-side forward temperature sensor 115 for detecting the temperature of the heat medium in the load-side circulation circuit 113 flowing out from the load-side heat exchanger 105, and a microcomputer for controlling the driving of each actuator in response to a signal from each sensor The control means 116 having

  In such a heat pump device, the compressor 104, the heat source side circulation pump 110, and the load side circulation pump 114 are driven, and the heat on the heat source unit 102 side is collected to the refrigerant side by the heat source side heat exchanger 107. When the heating operation is performed as a load operation in which the load-side heat exchanger 105 heats the load-side heat medium using the heat, the control means 116 uses the heat-source-side forward temperature sensor 111 during the heating operation. The rotational speed of the heat source side circulation pump 110 is controlled to adjust the flow rate of the heat medium so that the temperature of the heat medium to be detected becomes a predetermined target temperature. (For example, refer to Patent Document 1.)

Japanese Patent Publication No.8-14437

  This conventional heat pump device controls the rotation speed of the heat source side circulation pump 110 so that the temperature of the heat medium (heat source going temperature) detected by the heat source side going temperature sensor 111 becomes a predetermined target temperature during the heating operation. FIG. 9 shows a time chart during the heating operation. Here, the predetermined target temperature is set to 8 ° C., and the temperature of the heating medium (detected by the load side temperature sensor 115 ( The compressor 104 is controlled so that the heating temperature) is 45 ° C., for example. The time t0 is an arbitrary time after the heating operation is stabilized. 9 is the temperature of the refrigerant on the heat source side heat exchanger 107 side until it is discharged from the expansion valve 106 and sucked into the compressor 104.

  Here, the time chart during the heating operation shown in FIG. 9 will be described. First, when the heating temperature decreases from time t1 to t2, the control means 116 starts increasing the rotation speed of the compressor 104 (time t2) because the heating output (load output) at the load terminal 112 is insufficient. In conjunction with this, the evaporation side refrigerant temperature starts to decrease (time t2).

  Then, the evaporation side refrigerant temperature decreases, and the heat source going temperature begins to decrease with a delay in response to the decrease in the evaporation side refrigerant temperature (time t3). Then, the control means 116 detects that the heat source going temperature has fallen below the predetermined target temperature, and starts to increase the rotational speed of the heat source side circulation pump 110 (time t4).

  When the rotation speed of the heat source side circulation pump 110 is started to increase at time t4, the heat collection output pumped up from the heat source unit 102 side by the heat source side heat exchanger 107 also increases, and the evaporation side refrigerant temperature rises. Go. Thereafter, in response to the increase in the evaporation side refrigerant temperature, the heat source going temperature begins to rise with a delay (time t5).

  At time t7, the heating going temperature reaches 45 ° C., the heating output is satisfied, and the heat source going temperature reaches 8 ° C., which is the predetermined target temperature. The rotation speed is maintained, and then stable heating operation is continued.

  By the way, in such a conventional heat pump device, the temperature of the heat medium detected by the heat source side going temperature sensor 111 (heat source going temperature) is adjusted to a predetermined target temperature during the heating operation. When the number of revolutions is controlled, as shown in FIG. 9, there is a time difference until the heating output fluctuation, here, the increase in heating output is reflected in the temperature going to the heat source, and the desired heating output can be output. In the meantime, the heat pump system COP (= “heating output ÷ (power consumption of the compressor 104 + consumption power of the heat source side circulation pump 110)”) has also deteriorated. In addition, although the case where heating output increased here was demonstrated, it had the same subject also when heating output decreased.

In order to solve the above-described problems, the present invention particularly includes the configuration of a heat pump circuit in which a compressor, a load-side heat exchanger, a decompression unit, and a heat-source-side heat exchanger are annularly connected by refrigerant piping, and the heat source. A heat source circulation type heat source section for heating the refrigerant of the side heat exchanger, a heat source side circulation circuit in which the heat source of the heat source section and the heat source side heat exchanger are annularly connected by a heat medium pipe, and the heat source A heat source side circulation pump for circulating the heat medium in the side circulation circuit, a refrigerant temperature detection means for detecting the temperature of the refrigerant on the heat source side heat exchanger side, and a control means for controlling the operation of the heat source side heat. A heat pump device that performs a load operation of heating the load side by causing the load side heat exchanger to function as a condenser at the same time that the exchanger functions as an evaporator, and the control means is configured to perform the load operation, Temperature detected by the refrigerant temperature detecting means And controls the rotational speed of the heat source-side circulation pump to a predetermined target temperature, the target temperature of the refrigerant temperature detecting means, the heat source side for detecting the temperature of the heating medium flowing into the heat source side heat exchanger The return temperature detection means changes to a higher temperature as the return temperature detected is higher .

According to this inventions, to quickly grasp the variation of the load output due to variations in temperature detected by the refrigerant temperature detecting means, temperature detected by the refrigerant temperature detecting means, preset target temperature can maintain a high system COP By adjusting the flow rate of the heat medium that circulates through the heat source side circulation circuit by controlling the rotation speed of the heat source side circulation pump, the time required to perform optimum heat collection and output the desired load output The load operation can be performed while maintaining the system COP of the heat pump device high.
Further, during the load operation, the higher the temperature detected by the heat source side return temperature detection means, the higher the predetermined target temperature is set, so that the power consumption of the compressor can be reduced, and the heat pump device It is possible to improve the COP of the heat pump device, and consequently the system COP of the heat pump device.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram of the heat pump apparatus of one Embodiment of this invention. The flowchart which shows the action | operation at the time of the load driving | operation of the same embodiment. The time chart which shows the action | operation at the time of the load driving | operation of the same embodiment. The time chart which shows the action | operation at the time of the load driving | operation of the same embodiment. The flowchart which shows another action | operation at the time of load driving | running of the same embodiment. Schematic when the load operation of the same embodiment is a boiling operation for heating and boiling hot water used for hot water supply or the like. Schematic when the load operation of the same embodiment is a heating operation in which an air-conditioned space is warmed by an indoor unit for air conditioning. The schematic block diagram of the conventional heat pump apparatus. The time chart which shows the action | operation at the time of the heating operation of the conventional heat pump apparatus.

Next, a heat pump device according to an embodiment of the present invention will be described with reference to FIG.
As shown in the figure, the heat pump device of the present embodiment is roughly composed of a heat pump unit 1, a heat medium circulation type underground heat exchange unit 2 as a heat source unit, and a load heat exchange unit 3. .

  The heat pump unit 1 circulates a variable-speed compressor 4 that compresses the refrigerant and a high-pressure refrigerant discharged from the compressor 4, and exchanges heat between the high-pressure refrigerant and the load-side heat medium of the load heat exchange unit 3. A load side heat exchanger 5 as a condenser for performing the above, an expansion valve 6 as a pressure reducing means for reducing the pressure of the refrigerant flowing out from the load side heat exchanger 5, and a low pressure refrigerant from the expansion valve 6 by circulating the low pressure refrigerant. A heat source side heat exchanger 7 as an evaporator that performs heat exchange with the heat medium on the heat source side of the underground heat exchanging unit 2, and these are connected in an annular shape with a refrigerant pipe to form a heat pump circuit 8 It is. In addition, as a refrigerant | coolant of the heat pump unit 1, arbitrary refrigerant | coolants, such as a carbon dioxide refrigerant | coolant and a HFC refrigerant | coolant, can be used. Reference numeral 9 denotes a refrigerant temperature sensor as refrigerant temperature detection means for detecting the temperature of the refrigerant, which is provided in the refrigerant pipe on the heat source side heat exchanger 7 side until it is discharged from the expansion valve 6 and sucked into the compressor 4. It is what.

  The underground heat exchange unit 2 includes a heat source side heat exchanger 7 and a plurality of underground heat exchangers 10 embedded in the ground G as heat sources for heating the refrigerant of the heat source side heat exchanger 7 and connected in parallel to each other. And a ground heat circulation circuit 11 as a heat source side circulation circuit that connects the heat source side heat exchanger 7 and the ground heat exchanger 10 in a ring shape with a heat medium pipe, and a heat medium to the ground heat circulation circuit 11. A ground heat circulation pump 12 serving as a heat source side circulation pump having a variable number of revolutions for circulating water and antifreeze, and a heat source side heat exchanger 7 which is provided in the ground heat circulation circuit 11 and flows out of the ground heat exchanger 10. And an underground return temperature sensor 13 as a heat source side return temperature detection means for detecting the temperature of the heat medium flowing into the heat medium.

  Here, in the underground heat exchanging section 2, when performing a load operation described later, the underground heat exchanger 10 collects underground heat from the ground G, and the heat transfer medium with the heat is underground. The heat circulation pump 12 supplies the heat source side heat exchanger 7. Then, the heat and the heat medium are opposed to each other in the heat source side heat exchanger 7 to exchange heat, and the underground heat collected in the underground heat exchanger 10 is transferred to the refrigerant side of the heat pump unit 1. The heat source side heat exchanger 7 is pumped up and functions as an evaporator.

  The load heat exchanging unit 3 includes the load side heat exchanger 5 that applies heat to the load side, a load terminal 14 such as a floor heating panel that heats the air-conditioned space, the load side heat exchanger 5 and the load terminal 14. The load side circulation circuit 15 is connected to the load side circulation circuit 15 so as to circulate, the load side circulation pump 16 circulates the circulating fluid for heating in the load side circulation circuit 15, and the load side circulation circuit 15 branched for each load terminal 14. A thermal valve 17 (17a, 17b) that controls the supply of the circulating fluid for heating to the load terminal 14 by opening and closing thereof is provided. Reference numeral 18 denotes a load-side forward temperature sensor that is provided in the load-side circulation circuit 15 and detects the temperature of the circulating fluid for heating flowing into the load terminal 14 from the load-side heat exchanger 5.

  A remote control (not shown) is installed in each air-conditioned space heated by the load terminal 14. When the remote controller instructs to heat the air-conditioned space, the compressor 4 and the underground heat are provided. The driving of the circulation pump 12 and the load-side circulation pump 16 is started, and the load-side heat exchanger 7 functions as an evaporator and the load-side heat exchanger 5 functions as a condenser to heat the load side. The heating operation is performed. During the heating operation, in the load-side heat exchanger 5, the refrigerant and the heating circulating fluid flow oppositely to perform heat exchange, and the heating circulating fluid heated in the load-side heat exchanger 5 is The air-conditioned space that is sent to the load terminal 14 via the thermal valve 17 and received an instruction from the remote controller is heated.

  Reference numeral 19 denotes an input of the refrigerant temperature sensor 9, the underground return temperature sensor 13, the heating temperature sensor 18, and a signal from the remote controller, and the compressor 4, the expansion valve 6, the underground heat circulation pump 12, and the load side circulation pump. The control means 19 includes a microcomputer for controlling the driving of each of the 16 actuators, and the control means 19 is a geothermal circulation pump so that the temperature detected by the refrigerant temperature sensor 9 becomes a predetermined target temperature during the heating operation. 12 to adjust the flow rate of the heat medium circulating in the underground heat circulation circuit 11 by controlling the rotational speed of the compressor 12, and the compressor 4 is set so that the temperature detected by the load side temperature sensor 18 becomes a predetermined temperature. It is something to control.

Next, the action | operation at the time of the heating operation of one Embodiment shown in FIG. 1 is demonstrated based on the flowchart shown in FIG.
When the load terminal 14 instructs the heating of the air-conditioned space by the remote controller, the control means 19 starts driving the compressor 4, the geothermal circulation pump 12, and the load-side circulation pump 16, and the heating operation is performed. Be started. Here, at the start of the heating operation, the underground heat circulation pump 12 starts to be driven at a preset constant rotation speed. When the heating operation is started, in the load-side heat exchanger 5, the heating circulating liquid circulated by the load-side circulation pump 16 and the high-temperature and high-pressure refrigerant discharged from the compressor 4 are heat-exchanged and heated. The circulating fluid for heating is supplied to the load terminal 14 to heat the air-conditioned space, and in the heat source side heat exchanger 7, the ground heat is circulated by the ground heat circulation pump 12 and the ground heat is taken through the ground heat exchanger 10. Heat exchange between the heated heat medium and the low-temperature and low-pressure refrigerant discharged from the expansion valve 6 heats and evaporates the refrigerant by underground heat.

  During the heating operation, the refrigerant temperature sensor 9 detects the temperature of the refrigerant on the heat source side heat exchanger 7 side (step S1), and compares the detected refrigerant temperature with the predetermined target temperature ( Step S2). Here, the predetermined target temperature may be a system COP (= “heating output ÷ (power consumption of the compressor 4 + power consumption of the underground heat circulation pump 12)”) by a test performed in advance using a heat pump device. This is the temperature of the refrigerant on the heat source side heat exchanger 7 side when the value is shown, and the temperature is set as a predetermined target temperature and stored in the control means 19. It should be noted that the predetermined target temperature may have a hysteresis of ± A ° C. for control, and A uses an arbitrary value of 0 or more.

  In step S2, the control means 19 determines whether or not the refrigerant temperature detected by the refrigerant temperature sensor 9 is a predetermined target temperature, in this case, 5 ° C., and the detected refrigerant temperature is the predetermined target temperature. If it is determined that there is, the control is performed so as to maintain the rotation speed of the underground heat circulation pump 12 so far, and the circulation flow rate of the heat medium in the underground heat circulation circuit 11 is kept constant (step S3), and the step S1 is performed. It returns to the process of.

  In step S2, if the control unit 19 determines that the detected refrigerant temperature is not the predetermined target temperature, the control unit 19 determines whether the detected refrigerant temperature is lower than the predetermined target temperature (step S4). If it is determined that the detected refrigerant temperature is lower than the predetermined target temperature, the rotation speed of the geothermal circulation pump 12 is increased by a predetermined rotation speed, and the circulation flow rate of the heat medium in the geothermal circulation circuit 11 is increased (step S5). ), The process returns to step S1. On the other hand, if it is determined in step S4 that the detected refrigerant temperature is higher than the predetermined target temperature, the rotation speed of the underground heat circulation pump 12 is decreased by a predetermined rotation speed, and the heat medium of the underground heat circulation circuit 11 is reduced. The circulating flow rate is decreased (step S6), and the process returns to step S1.

  Next, the operation of the heating operation shown in the flowchart of FIG. 2 will be described using the time charts of FIGS. Here, the predetermined target temperature is set to 5 ° C. as an initial condition, and in the heating operation of the load terminal 14, the temperature of the heating medium (heating heating temperature) detected by the control means 19 with the load side going temperature sensor 18 is 45, for example. It is assumed that the compressor 4 is controlled so as to be at ° C. The time t0 is an arbitrary time after the heating operation is stabilized. 3 and 4 is the temperature of the refrigerant on the heat source side heat exchanger 7 side until it is discharged from the expansion valve 6 and sucked into the compressor 4, and the underground temperature is the heat source It is the temperature of the heat medium of the underground heat circulation circuit 11 flowing out from the side heat exchanger 7, and is a temperature corresponding to the heat source going temperature in the time chart shown in FIG.

  First, the time chart of FIG. 3 will be described. At time t1, the refrigerant temperature sensor 9 detects the temperature of the refrigerant on the heat source side heat exchanger 7 side (step S1). It is determined whether or not the detected temperature of the refrigerant is 5 ° C. (step S2), and since the detected temperature of the refrigerant is 5 ° C., the rotation speed of the underground heat circulation pump 12 is maintained ( Step S3).

  Subsequently, the heating going temperature decreases from time t1 to time t2, and when the control means 19 detects that the heating going temperature detected by the load side going temperature sensor 18 has dropped at time t2, the load terminal 14 As the heating output (load output) is insufficient, the rotation speed of the compressor 4 is increased. Further, the evaporation side refrigerant temperature starts to decrease in conjunction with the increase in the rotational speed of the compressor 4. At time t2, as in time t1, processing is performed in the order of step S1, step S2, and step S3.

  Then, the evaporation side refrigerant temperature decreases from time t2 to time t3. At time t3, the refrigerant temperature sensor 9 detects the temperature of the refrigerant on the heat source side heat exchanger 7 side (step S1), and the control means 19 Determines whether or not the temperature of the refrigerant detected by the refrigerant temperature sensor 9 is 5 ° C. (step S2). Since the detected temperature of the refrigerant is not 5 ° C., the process proceeds to step S4. In step S4, it is determined that the detected temperature of the refrigerant is lower than 5 ° C., and the rotational speed of the underground heat circulation pump 12 is increased by a predetermined rotational speed from the previous rotational speed (step S5).

  Then, the evaporation side refrigerant temperature rises from time t3 to time t4, and the heat collection output pumped from the underground heat exchanging unit 2 side by the heat source side heat exchanger 7 also increases. At time t4, time t3 In the same manner as in step S1, step S2, step S4, and step S5, the evaporation side refrigerant temperature rises from time t4 to time t5, and the heat source side heat exchanger 7 The heat collection output pumped from the heat exchange part 2 side also increases.

  At time t5, the refrigerant temperature sensor 9 detects the temperature of the refrigerant on the heat source side heat exchanger 7 side (step S1), and the control means 19 detects that the refrigerant temperature detected by the refrigerant temperature sensor 9 is 5 ° C. It is determined whether or not there is (step S2), and since the detected refrigerant temperature is 5 ° C., the rotation speed of the geothermal circulation pump 12 up to that point is maintained (step S3) and the heating temperature Becomes a desired heating output at 45 ° C., and after time t5, stable heating operation is continued.

  Next, the time chart of FIG. 4 will be described. At time t1, the refrigerant temperature sensor 9 detects the temperature of the refrigerant on the heat source side heat exchanger 7 side (step S1). It is determined whether or not the temperature of the refrigerant detected in step 5 is 5 ° C. (step S2). Since the detected temperature of the refrigerant is 5 ° C., the rotation speed of the underground heat circulation pump 12 is maintained. (Step S3).

  Subsequently, the heating going temperature rises from time t1 to time t2, and when the control means 19 detects that the heating going temperature detected by the load side going temperature sensor 18 has risen at time t2, the load terminal 14 The heating speed of the compressor 4 is excessive, and the rotation speed of the compressor 4 is started to decrease. Further, the evaporation side refrigerant temperature starts to rise in conjunction with a decrease in the rotational speed of the compressor 4. At time t2, as in time t1, processing is performed in the order of step S1, step S2, and step S3.

  Then, the evaporation side refrigerant temperature rises from time t2 to time t3. At time t3, the refrigerant temperature sensor 9 detects the temperature of the refrigerant on the heat source side heat exchanger 7 side (step S1), and the control means 19 Determines whether or not the temperature of the refrigerant detected by the refrigerant temperature sensor 9 is 5 ° C. (step S2). Since the detected temperature of the refrigerant is not 5 ° C., the process proceeds to step S4. In step S4, it is determined that the detected temperature of the refrigerant is higher than 5 ° C., and the rotational speed of the underground heat circulation pump 12 is decreased by a predetermined rotational speed from the rotational speed up to that point (step S6).

  Then, the evaporation side refrigerant temperature decreases from the time t3 to the time t4, and the heat collection output pumped from the underground heat exchanging unit 2 side by the heat source side heat exchanger 7 also decreases. At the time t4, the time t3 In the same manner as above, the processing is performed in the order of Step S1, Step S2, Step S4, and Step S6. The evaporation side refrigerant temperature decreases from time t4 to time t5, and the heat source side heat exchanger 7 The heat collection output pumped from the heat exchange part 2 side also decreases.

  At time t5, the refrigerant temperature sensor 9 detects the temperature of the refrigerant on the heat source side heat exchanger 7 side (step S1), and the control means 19 detects that the refrigerant temperature detected by the refrigerant temperature sensor 9 is 5 ° C. It is determined whether or not there is (step S2), and since the detected refrigerant temperature is 5 ° C., the rotation speed of the geothermal circulation pump 12 up to that point is maintained (step S3) and the heating temperature Becomes a desired heating output at 45 ° C., and after time t5, stable heating operation is continued.

  In the heating operation described above, the control unit 19 can quickly grasp the fluctuation of the heating output (load output) by monitoring the refrigerant temperature detected by the refrigerant temperature sensor 9. The refrigerant temperature detected by the refrigerant temperature sensor 9 is lowered even when the temperature in the ground G is lowered because the heat in the ground G is continuously collected when there is no fluctuation and the temperature is constant. Therefore, the control means 19 can quickly grasp the temperature fluctuation in the ground G, that is, the fluctuation of the heat collection output by monitoring the refrigerant temperature detected by the refrigerant temperature sensor 9, and also in this case, the control means 19 controls the rotational speed of the underground heat circulation pump 12 so that the refrigerant temperature detected by the refrigerant temperature sensor 9 becomes a predetermined target temperature.

  In the heating operation described above, the control means 19 detects the temperature of the refrigerant on the heat source side heat exchanger 7 side with the refrigerant temperature sensor 9 (step S1), and compares the detected refrigerant temperature with a predetermined target temperature. (Step S2), and the number of revolutions of the geothermal circulation pump 12 is controlled so that the temperature detected by the refrigerant temperature sensor 9 becomes a predetermined target temperature (steps S3, S5, S6). By adjusting the flow rate of the heat medium that circulates in the circulation circuit 11, it is possible to shorten the time required to perform optimum heat collection and output the desired heating output, and to maintain the system COP of the heat pump device high. Heating operation can be carried out with this.

  The predetermined target temperature may be set according to the temperature of the heat medium detected by the underground return temperature sensor 13 as shown in the flowchart of FIG. 5 representing the operation during the heating operation. More specifically, during the heating operation, the control means 19 detects the temperature of the heat medium detected by the underground return temperature sensor 13 (step S7), and the detected temperature of the heat medium is set to a predetermined temperature, for example, It is determined whether or not the temperature is lower than 10 ° C. (step S8). If it is determined that the detected temperature of the heat medium is lower than a predetermined temperature set in advance, the predetermined target temperature is set to α ° C., for example, 5 ° C. (step S9). On the other hand, if it is determined in step S8 that the detected temperature of the heat medium is equal to or higher than a predetermined temperature, a predetermined target temperature is set to β (β> α) ° C., for example, 7 ° C. (step S10). After the process of step S9 or step S10 is performed, the same process as the process of step S1 to step S6 shown in the flowchart of FIG. 2 is performed in step S11 to step S16. Performed, in which the process returns to the step S7.

  Thus, during the heating operation, the control means 19 increases the predetermined target temperature as the temperature of the heat medium detected by the underground return temperature sensor 13 increases, that is, as the amount of heat held on the heat source side has a margin. When the predetermined target temperature is increased, the refrigerant temperature sucked into the compressor 4 is increased, so that the refrigerant temperature discharged from the compressor 4, for example, 70 ° C. is obtained. As compared with the case where the intake refrigerant temperature to the compressor 4 is low, the higher the intake refrigerant temperature to the compressor 4, the smaller the rotation speed of the compressor 4, that is, the lower the power consumption of the compressor 4. is there. Therefore, during heating operation, the higher the temperature of the heat medium detected by the underground return temperature sensor 13 is, the higher the predetermined target temperature is set, so that the COP (= “heating output ÷ compressor 104” of the heat pump device is set. It is possible to improve the "power consumption" and thus the system COP.

  The control means 19 determines whether or not the temperature of the heat medium detected by the underground return temperature sensor 13 is lower than a predetermined temperature set in advance in step S8, and in step S9 or step S10, the predetermined temperature is determined. Although the target temperature is set to α ° C. or β ° C., the higher the temperature of the heat medium detected by the underground return temperature sensor 13, the higher the predetermined target temperature may be set. A data table in which a predetermined target temperature is associated with each temperature detected by the underground return temperature sensor 13 may be stored in the control means 19 based on the test performed.

  Further, the present invention is not limited to the above-described embodiment. In the present embodiment, the control of the present invention is applied during a heating operation in which a room that is an air-conditioned space is heated by a load terminal 14 such as a floor heating panel. However, as shown in FIG. 6, the load terminal 14 is a hot water storage tank 20 for storing hot water used for hot water supply or the like, and the control of the present invention is applied to a boiling operation for boiling hot water in the hot water storage tank 20 as a load operation. Further, as shown in FIG. 7, the control of the present invention may be applied to the heating operation by the indoor unit 21 for air conditioning as the load operation. Various modifications are possible within the range not changed, and this is not disturbed.

  In the present embodiment, the plurality of underground heat exchangers 10 embedded in the ground G are connected in parallel to each other, but the plurality of underground heat exchangers 10 may be connected in series to each other, Furthermore, as long as desired heat collection can be performed from the ground G without embedding a plurality of underground heat exchangers 10, only one underground heat exchanger 10 may be embedded.

  Moreover, in this embodiment, although the underground heat exchange part 2 which collects the underground heat in the ground G with the underground heat exchanger 10 was employ | adopted as a heat-medium circulation type heat source part, It may be a heat medium circulation type that circulates water in the river, lake, or sea to heat the refrigerant in the heat source side heat exchanger 7, and directly or indirectly uses hot water stored in a hot water storage tank. Then, a heat medium circulation type that heats the refrigerant of the heat source side heat exchanger 7 may be used, and various modifications are possible without departing from the scope of the present invention, and this is not disturbed.

DESCRIPTION OF SYMBOLS 2 Ground heat exchange part 4 Compressor 5 Load side heat exchanger 6 Expansion valve 7 Heat source side heat exchanger 8 Heat pump circuit 9 Refrigerant temperature sensor 10 Ground heat exchanger 11 Ground heat circulation circuit 12 Ground heat circulation pump 13 Underground return temperature sensor 19 Control means

Claims (1)

A heat pump circuit in which a compressor, a load-side heat exchanger, a decompression unit, a heat source-side heat exchanger are connected in a ring shape with a refrigerant pipe, a heat medium circulation type heat source for heating the refrigerant of the heat source-side heat exchanger, A heat source side circulation circuit in which the heat source of the heat source unit and the heat source side heat exchanger are annularly connected by a heat medium pipe, a heat source side circulation pump that circulates the heat medium in the heat source side circulation circuit, and heat source side heat exchange A refrigerant temperature detecting means for detecting the temperature of the refrigerant on the heater side, and a control means for controlling the operation of the refrigerant. The heat source side heat exchanger functions as an evaporator and at the same time the load side heat exchanger is condensed. A heat pump device that performs a load operation for heating the load side by functioning as a vessel, wherein the control means is configured so that the temperature detected by the refrigerant temperature detection means becomes a predetermined target temperature during the load operation. Controls the rotation speed of the heat source side circulation pump But that, a target temperature of the refrigerant temperature detecting means, the heat source-side return temperature detecting means for detecting the temperature of the heating medium flowing into the heat source side heat exchanger, as the return temperature detected is high, changes to a higher temperature A heat pump device characterized by that.

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