JP2011185529A - Geothermal heat pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a geothermal heat pump device which prevents damages to a coolant pipe and functional components and generation of noise due to freezing of the coolant pipe on an evaporator side. <P>SOLUTION: The geothermal heat pump device includes a heat pump circuit 9 circularly connecting a compressor 4, a load-side heat exchanger 5, a pressure reducing means 6, and a heat source side heat exchanger 7 by the coolant pipe 8, and a geothermal circulation circuit 14 circularly connecting a geothermal heat exchanger 12 and the heat source side heat exchanger 7. The geothermal heat pump device collects geothermal heat by the geothermal heat exchanger 12 and carries out load operation for heating the load side by making the heat source side heat exchanger 7 function as an evaporator as well as making the load-side heat exchanger 5 function as a condenser. The geothermal heat pump device is provided with a freezing determination means 22 for determining freezing of the coolant pipe 8 on the heat source side heat exchanger 7 side. When the freezing determination means 22 determines that the coolant pipe 8 on the heat source side heat exchanger 7 is frozen during the load operation, thawing operation for thawing by flowing a high-temperature coolant in the coolant pipe 8 on the heat source side heat exchanger 7 is carried out. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a geothermal heat pump device that uses geothermal heat whose temperature is relatively stable throughout the year through a heat pump.

  Conventionally, in this type of geothermal heat pump device, as shown in FIG. 18, a heat pump in which a compressor 101, a load side heat exchanger 102, an expansion valve 103, and a heat source side heat exchanger 104 are annularly connected by a refrigerant pipe 105. The circuit 106, the underground heat exchanger 107 buried in the ground G, and the underground heat circulation circuit in which the underground heat exchanger 107 and the heat source side heat exchanger 104 are annularly connected by the heat medium pipe 108. 109 and a geothermal circulation pump 110 that circulates the antifreeze liquid as a heat medium in the geothermal circulation circuit 109, and the geothermal heat that is relatively stable throughout the year is collected by the geothermal heat exchanger 107. The load such as the heating operation for heating the air in the air-conditioned space on the load side and the boiling operation for heating hot water by causing the heat source side heat exchanger 104 to function as an evaporator and the load side heat exchanger 102 as a condenser Things to drive There was. (For example, refer to Patent Document 1.)

JP 2009-236403 A

  By the way, if this conventional geothermal heat pump apparatus continues the said load operation and continues the heat collection from the ground G with the geothermal heat exchanger 107, the temperature in the ground G will be over time. It goes down. In particular, when heating operation is performed for 24 hours in a cold region in winter, it appears remarkably.

  The load operation is continuously performed, and the temperature in the ground G is lowered, whereby the temperature of the antifreeze liquid flowing from the underground heat exchanger 107 into the heat source side heat exchanger 104 is lowered, for example, about 2 ° C. In this case, the temperature of the refrigerant flowing through the heat source side heat exchanger 104 is 0 ° C. or a minus region.

  Then, the refrigerant pipe 105 on the heat source side heat exchanger 104 side from the expansion valve 103 to the compressor 101, that is, the low-pressure side refrigerant pipe 105 is also in a negative region, and the outside air is in the surface of the low-pressure side refrigerant pipe 105. The water of the ice freezes, and the ice gradually grows and stacks with time.

  However, even if the refrigerant pipe 105 on the low-pressure side freezes and the ice grows and is stacked, the heat exchange capacity in the heat source side heat exchanger 104 does not decrease, and there is nothing about continuing the load operation. There was no problem.

  However, if the refrigerant pipe 105 on the low-pressure side freezes, and the ice grows and is excessively stacked, the ice interferes with the housing containing the heat pump circuit 106, the partition plate in the housing, etc., and the pressing force is thereby reduced. There is a possibility that the refrigerant pipe 105 may be damaged by being applied to the refrigerant pipe 105 on the low pressure side, and functional parts such as the expansion valve 103 may be frozen and damaged. The applicant of the present application has found that when contacting with a partition plate or the like, the vibration of the compressor 101 is transmitted to the casing through ice to generate noise.

  In order to solve the above-mentioned problems, the present invention is particularly configured in claim 1 with a heat pump circuit in which a compressor, a load-side heat exchanger, a pressure reducing means, and a heat-source-side heat exchanger are connected in an annular shape with a refrigerant pipe, A ground heat exchanger embedded in the ground, a ground heat circulation circuit in which the ground heat exchanger and the heat source side heat exchanger are annularly connected by a heat medium pipe, and the ground heat circulation circuit A ground heat circulation pump that circulates the heat medium, collects ground heat by the ground heat exchanger, causes the heat source side heat exchanger to function as an evaporator, and the load side heat exchanger In the geothermal heat pump apparatus that performs a load operation that functions as a condenser and heats the load side, an icing determination means that determines whether or not the refrigerant pipe on the heat source side heat exchanger side is frozen is provided, and the load During operation, the heat source side heat exchanger is operated by the icing determination means. If the refrigerant pipe is determined to be frozen it was assumed to perform thawing operation for deicing by passing a high-temperature refrigerant to the refrigerant pipes of the heat source-side heat exchanger side.

  Further, in claim 2, in the underground heat pump apparatus according to claim 1, refrigerant temperature detection means for detecting the temperature of the refrigerant on the heat source side heat exchanger side, outside air temperature detection means for detecting the outside air temperature, During the load operation, the time when the refrigerant temperature detected by the refrigerant temperature detecting means is equal to or lower than zero degrees and the outside air temperature detected by the outside air temperature detecting means is higher than the refrigerant temperature detected by the refrigerant temperature detecting means is measured. Measuring means for performing the operation, and the icing determining means determines that the refrigerant pipe on the heat source side heat exchanger side is icing when the time measured by the measuring means reaches a preset first set time. It was supposed to be.

  Further, in claim 3, in the underground heat pump apparatus according to claim 1, a refrigerant temperature detecting means for detecting the temperature of the refrigerant on the heat source side heat exchanger side, an outside air temperature detecting means for detecting the outside air temperature, During the load operation, the time when the refrigerant temperature detected by the refrigerant temperature detecting means is equal to or lower than zero degrees and the outside air temperature detected by the outside air temperature detecting means is higher than the refrigerant temperature detected by the refrigerant temperature detecting means is integrated. And the icing determining means determines that the refrigerant pipe on the heat source side heat exchanger side is icing when the accumulated time in the integrating means reaches a preset second set time. It was supposed to be.

  According to a fourth aspect of the present invention, in the geothermal heat pump device according to the third aspect of the present invention, first cumulative reset means for resetting the cumulative time stored in the cumulative means is provided, and the first cumulative reset means is configured to perform the load operation. When a predetermined temperature at which the outside air temperature detected by the outside air temperature detecting means is higher than zero is detected for a predetermined time during the stop, the integrated time stored in the integrating means is reset.

  Further, according to claim 5, in the geothermal heat pump device according to claim 3, provided is a first subtracting means for subtracting the accumulated time stored in the integrating means, and the first subtracting means is in a state where the load operation is stopped. Furthermore, when a predetermined temperature at which the outside air temperature detected by the outside air temperature detecting means is higher than zero degree is detected for a predetermined time, the integrated time stored in the integrating means is subtracted.

  According to claim 6, in the geothermal heat pump device according to claim 3, when the load operation is stopped, the accumulated time accumulated by the integrating means has not reached a preset third set time. Is provided with an integration clearing means for clearing the integration time integrated in the integration means.

  Further, in claim 7, in the geothermal heat pump device according to claim 6, when the load operation is stopped by providing a second integration reset unit that resets the integration time stored in the integration unit, the integration unit When the accumulated time accumulated by step S3 reaches the third set time, and when the outside temperature detected by the outside temperature detecting means detects a predetermined temperature higher than zero degree during the load operation stop after that, The second integration reset means resets the integration time stored in the integration means.

  Further, in claim 8, in the geothermal heat pump device according to claim 6, the second subtracting means for subtracting the accumulated time stored in the integrating means is provided, and when the load operation is stopped, the integrating means If the accumulated time has reached the third set time, and a predetermined temperature at which the outside air temperature detected by the outside air temperature detecting means is higher than zero is detected for a predetermined time while the load operation is stopped thereafter, the first time The 2 subtracting means subtracts the accumulated time stored in the integrating means.

  Further, according to claim 9, in the underground heat pump apparatus according to any one of claims 2 to 8, in place of the refrigerant temperature detection means, the heat source side heat exchanger flows out of the heat source side heat exchanger. Underground temperature detection means for detecting the temperature of the heat medium flowing into the vessel was provided.

  According to claim 1 of the present invention, when it is determined by the icing determination means that the refrigerant pipe on the heat source side heat exchanger side is frozen during the load operation, the refrigerant pipe on the heat source side heat exchanger side is connected to the refrigerant pipe on the heat source side heat exchanger side. Since the deicing operation is performed to defrost by flowing a high-temperature refrigerant, it is possible to prevent damage to the functional components such as the refrigerant piping and the expansion valve due to freezing of the refrigerant piping on the heat source side heat exchanger side, Generation of noise due to icing of the refrigerant piping on the heat source side heat exchanger side can be prevented in advance.

  According to claim 2, during the load operation, the refrigerant temperature detected by the refrigerant temperature detecting means is equal to or lower than zero degrees, and the outside air temperature detected by the outside air temperature detecting means is higher than the refrigerant temperature detected by the refrigerant temperature detecting means. By providing a measuring means for measuring the time of the hour, it is possible to measure only the time when the icing conditions of the refrigerant piping on the heat source side heat exchanger side are met. When the set first set time is reached, it is determined that the refrigerant pipe on the heat source side heat exchanger side is frozen, so there is no wasteful de-icing operation, and a set time is provided to set the heat source side heat. The ice-melting operation can be performed before the ice is excessively stacked on the refrigerant pipe on the exchanger side.

  According to claim 3, during the load operation, the refrigerant temperature detected by the refrigerant temperature detecting means is equal to or lower than zero degrees, and the outside air temperature detected by the outside air temperature detecting means is higher than the refrigerant temperature detected by the refrigerant temperature detecting means. By providing the integration means for integrating the time of the hour, only the time when the icing conditions of the refrigerant pipes on the heat source side heat exchanger are met is integrated. When the set second set time is reached, it is determined that the refrigerant pipe on the heat source side heat exchanger side is frozen, so the load operation stops immediately before the second set time is reached, and the heat source side heat exchanger Even if the refrigerant piping on the side is covered with ice, when the accumulated time reaches the second set time, the ice-melting operation is performed. Therefore, the set time is provided so that the ice is stacked on the refrigerant piping on the heat source side heat exchanger side. The ice can be removed before the ice Those have never left.

  According to a fourth aspect of the present invention, when the first integration reset means detects a predetermined temperature at which the outside air temperature detected by the outside air temperature detection means is higher than zero degree for a predetermined time while the load operation is stopped, the integration stored in the integration means. By resetting the time, when the outside air temperature is high and the state continues for a predetermined time when the load operation is stopped, the ice in the refrigerant piping on the heat source side heat exchanger side is naturally defrosted. At that time, since the stored accumulated time is reset to zero, the determination of icing of the refrigerant pipe on the heat source side heat exchanger side is made more accurate, and useless deicing operation is not performed.

  According to a fifth aspect of the present invention, when the first subtracting means detects a predetermined temperature at which the outside air temperature detected by the outside air temperature detecting means is higher than zero degree for a predetermined time while the load operation is stopped, the integrated time stored in the integrating means is stored. If the outside air temperature is high and the state continues for a predetermined time when the load operation is stopped, the ice in the refrigerant piping on the heat source side heat exchanger side is somewhat naturally dissolved. Since the stored accumulated time is subtracted at that time, it is possible to more accurately determine the freezing of the refrigerant pipe on the heat source side heat exchanger while taking into account the remaining ice from the refrigerant pipe on the heat source side heat exchanger. Therefore, useless ice-breaking operation is not performed.

  According to the sixth aspect of the present invention, when the load operation is stopped, if the integration time integrated by the integration means has not reached the preset third set time, the inertial heat source is generated when the load operation is stopped. The ice in the refrigerant pipe on the heat source side heat exchanger side is defrosted by the high-temperature refrigerant flowing in the refrigerant pipe on the side heat exchanger side. In this case, the accumulated time accumulated in the integrating means is cleared by the accumulated clear means. Therefore, the time that does not need to be accumulated is not accumulated in the accumulating means, the determination of icing of the refrigerant pipe on the heat source side heat exchanger side can be made more accurate, and wasteful deicing operation can be performed. There is nothing.

  According to the seventh aspect, when the load operation is stopped, the integration time accumulated by the integration means reaches the third set time, and the outside air temperature detection means detects during the subsequent load operation stop. When the predetermined temperature at which the outside air temperature is higher than zero degree is detected for a predetermined time, the second integration reset unit resets the integration time stored in the integration unit, thereby stopping the load operation and causing inertia on the heat source side heat exchanger side. Even when the ice in the refrigerant pipe on the heat source side heat exchanger side remains unmelted when a high-temperature refrigerant flows through the refrigerant pipe, the outside air temperature is high and the state continues for a predetermined time even when the load operation is stopped. In such a case, the ice remaining in the refrigerant pipe on the heat source side heat exchanger side is naturally defrosted, and at that time, the stored accumulated time is reset to zero, so that the refrigerant on the heat source side heat exchanger side More accurate determination of piping icing It is that there is no possible to perform useless thaw operation.

  According to the eighth aspect of the invention, when the load operation is stopped, the integration time accumulated by the integration unit reaches the third set time, and the outside air temperature detection unit detects during the subsequent load operation stop. When the predetermined temperature at which the outside air temperature is higher than zero degree is detected for a predetermined time, the second subtracting unit subtracts the integrated time stored in the integrating unit to stop the load operation and the refrigerant on the heat source side heat exchanger side due to inertia When high-temperature refrigerant flows through the pipe, even if the ice in the refrigerant pipe on the heat source side heat exchanger side remains unmelted, when the load operation is stopped, the outside air temperature is high and the state continues for a predetermined time. In such a case, the ice remaining in the refrigerant pipe on the heat source side heat exchanger side is defrosted more or less naturally, and at that time, the stored accumulated time is subtracted, so that the refrigerant pipe on the heat source side heat exchanger side is subtracted. Heat source side heat exchange while considering the remaining ice The vessel side of the determination of the freezing of the refrigerant pipes and more precisely, those never perform useless deicing operation.

  According to the ninth aspect of the present invention, instead of the refrigerant temperature detecting means, the underground temperature detecting means for detecting the temperature of the heat medium flowing out from the heat source side heat exchanger and flowing into the underground heat exchanger is provided, and the heat source By detecting the temperature of the heat medium flowing out from the heat source side heat exchanger, which is a temperature approximate to the refrigerant temperature of the side heat exchanger, the heat source side heat exchanger is detected from the temperature of the heat medium detected by the underground temperature detecting means. Side refrigerant temperature can be estimated, and the determination of icing of the refrigerant piping on the heat source side heat exchanger side can be made reliably.

1 is a schematic configuration diagram of a first embodiment of the present invention. The principal part block diagram of the 1st Embodiment. The flowchart which shows the operation | movement at the time of ice-melting driving | operation of the 1st embodiment. The principal part block diagram of the 2nd Embodiment. The flowchart which shows the operation | movement at the time of ice-melting operation | movement of the said 2nd Embodiment. The flowchart which shows the operation | movement in the heating operation stop of the said 2nd Embodiment. The principal part block diagram of the 3rd Embodiment. The flowchart which shows the operation | movement in the heating operation stop of the said 3rd Embodiment. The principal part block diagram of the 4th Embodiment. The flowchart which shows the operation | movement in the heating operation stop of the same 4th Embodiment. The principal part block diagram of the 5th Embodiment. The flowchart which shows the operation | movement in the heating operation stop of the said 5th Embodiment. The principal part block diagram of the 6th Embodiment. The flowchart which shows the operation | movement in the heating operation stop of the 6th embodiment. The other heat pump circuit schematic in the 1st-6th embodiment of this invention. The another heat pump circuit schematic in the 1st-6th embodiment of this invention. The other schematic block diagram in the 1st-6th embodiment of this invention. The schematic block diagram of the conventional geothermal heat pump apparatus.

Next, a geothermal heat pump device according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1, the geothermal heat pump device of the present embodiment is roughly composed of a heat pump unit 1, a geothermal heat exchange unit 2, and a load heat exchange unit 3.

  The heat pump unit 1 circulates a variable capacity compressor 4 for compressing refrigerant and a high-temperature refrigerant discharged from the compressor 4 to exchange heat between the high-temperature refrigerant and the load-side heat medium of the load heat exchange unit 3. A load-side heat exchanger 5 as a condenser to be performed, an expansion valve 6 as a decompression means for decompressing the refrigerant flowing out from the load-side heat exchanger 5, and a decompressed low-temperature refrigerant from the expansion valve 6 are circulated. And a heat source side heat exchanger 7 as an evaporator for exchanging heat with the heat medium on the heat source side of the underground heat exchanging section 2, and these are connected in a ring shape with a refrigerant pipe 8 to form a heat pump circuit 9. It is what. 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. Further, 10 is provided in the refrigerant pipe 8 on the heat source side heat exchanger 7 side from the expansion valve 6 to the compressor 4, that is, the refrigerant pipe 8 on the low pressure side, and the surface temperature or the low pressure side of the refrigerant pipe 8 on the low pressure side. Reference numeral 11 denotes a refrigerant temperature sensor as refrigerant temperature detection means for detecting the temperature of the refrigerant flowing through the refrigerant pipe 8, and reference numeral 11 denotes an outside air temperature sensor as outside air temperature detection means for detecting the outside air temperature. Here, the outside air temperature is an expression including the outside air temperature outside the heat pump unit 1 and the ambient temperature inside the heat pump unit 1.

  The underground heat exchanger 2 includes a heat source side heat exchanger 7 and a plurality of underground heat exchangers 12 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 14 that connects the heat source side heat exchanger 7 and the ground heat exchanger 12 in a ring shape with a heat medium pipe 13, and an antifreeze that is a heat medium circulates in the ground heat circulation circuit 14. And a geothermal circulation pump 15 having a variable rotation speed.

  Here, in the underground heat exchanging section 2, when performing the load operation described later, the underground heat exchanger 12 collects the underground heat from the ground G, and the heat medium having the heat is the underground heat. The heat is supplied to the heat source side heat exchanger 7 by the circulation pump 15. Then, the refrigerant and the heat medium flow oppositely in the heat source side heat exchanger 7 to perform heat exchange, and the underground heat collected by the underground heat exchanger 12 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 circulates through a load side heat exchanger 5 that applies heat to the load side, a load terminal 16 such as a floor heating panel that heats the air-conditioned space, and the load side heat exchanger 5 and the load terminal 16. A load-side circulation circuit 17 that is connected in an annular manner, a load-side circulation pump 18 that circulates the circulating fluid for heating in the load-side circulation circuit 17, and a load-side circulation circuit 17 that branches for each load terminal 16. A thermal valve 19 (19a, 19b) for controlling the supply of the circulating fluid for heating to the load terminal 16 by opening and closing is provided. Reference numeral 20 denotes a load forward temperature sensor that is provided in the load-side circulation circuit 17 and detects the temperature of the circulating fluid for heating flowing into the load terminal 16 from the load-side heat exchanger 5.

  A remote control (not shown) is installed in each air-conditioned space heated by the load terminal 16. When the remote controller instructs to heat the air-conditioned space, the compressor 4 and the underground heat are provided. As the driving of the circulation pump 15 and the load side circulation pump 18 is started, the heat source 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 circulating fluid for heating flow to face each other to exchange heat, and the circulating fluid for heating heated in the load-side heat exchanger 5 The air-conditioned space that is sent to the load terminal 16 through the valve 19 and receives an instruction from the remote controller is heated.

  21 receives the input of the refrigerant temperature sensor 10, the outside air temperature sensor 11, the load going temperature sensor 20, and the signal from the remote controller, and the compressor 4, the expansion valve 6, the underground heat circulation pump 15, and the load side circulation pump 18 It is a control means which has the microcomputer which controls the drive of each actuator.

  The control means 21 detects whether or not the refrigerant pipe 8 on the heat source side heat exchanger 7 side is frozen during the heating operation, and the refrigerant temperature sensor 10 detects whether or not the refrigerant temperature sensor 10 is in the heating operation. The icing condition determining means 23 for determining whether or not an icing condition that the refrigerant temperature is equal to or lower than zero degrees and the outside air temperature detected by the outside air temperature sensor 11 is higher than the refrigerant temperature detected by the refrigerant temperature sensor 10 is satisfied; Measuring means 24 for measuring the time when the refrigerant temperature detected by the refrigerant temperature sensor 10 is equal to or less than zero degrees during operation and the outside air temperature detected by the outside air temperature sensor 11 is higher than the refrigerant temperature detected by the refrigerant temperature sensor 10; And a first storage means for storing a first set time serving as a reference for interrupting the heating operation and starting an ice-melting operation described later. The first set time is a time derived and set in advance by a test or the like, and is not a second unit or a minute unit, but a long time such as 30 hours, for example, is set.

  Here, the icing determination means 22 compares the measured time while the icing condition measured by the measuring means 24 during the heating operation is satisfied with the first set time stored by the first storage means 25. When the measurement time reaches the first set time, the refrigerant pipe 8 on the heat source side heat exchanger 7 side from the expansion valve 6 to the compressor 4 is frozen, that is, the heat source side heat exchanger. When it is determined that ice is stacked on the surface of the refrigerant pipe 8 on the 7 side, and the icing determination means 22 determines that the refrigerant pipe 8 on the heat source side heat exchanger 7 side is frozen, the control means 21. The geothermal circulation pump 15 and the load-side circulation pump 18 are stopped, the heating operation is temporarily interrupted, and the expansion valve 6 is fully opened or discharged from the compressor 4 with a larger opening than during the heating operation. The high-temperature refrigerant flows into the refrigerant pipe 8 on the heat source side heat exchanger 7 side. It performs a thawing operation for thawing ice laminated to the refrigerant pipe 8 surface of the heat source-side heat exchanger 7 side Te. Note that the ice-removal operation is performed for a certain time, and this certain time is obtained by setting in advance a time necessary for melting the ice in the refrigerant pipe 8 on the heat source side heat exchanger 7 side by a test or the like.

Next, the operation of the ice-melting operation during the heating operation of the first embodiment shown in FIGS. 1 and 2 will be described based on the flowchart shown in FIG.
When the load terminal 16 instructs the heating of the air-conditioned space by the remote controller, the control means 21 starts driving the compressor 4, the geothermal circulation pump 15, and the load-side circulation pump 18, and the heating operation is started. Is done. Here, at the start of the heating operation, the underground heat circulation pump 15 starts to be driven at a preset constant rotation speed. When the heating operation is started, the load-side heat exchanger 5 exchanges heat between the circulating fluid for heating circulated by the load-side circulation pump 18 and the high-temperature and high-pressure refrigerant discharged from the compressor 4, and is heated. The circulating fluid for use is supplied to the load terminal 16 to heat the air-conditioned space, and in the heat source side heat exchanger 7, it is circulated by the underground heat circulation pump 15 and collects the underground heat through the underground heat exchanger 12. The heat medium and the low-temperature and low-pressure refrigerant discharged from the expansion valve 6 are heat-exchanged, and the refrigerant is heated and evaporated by underground heat.

  During the heating operation, the icing condition determination means 23 determines whether the refrigerant temperature detected by the refrigerant temperature sensor 10 is equal to or lower than zero degrees and the outside air temperature detected by the outside air temperature sensor 11 is higher than the refrigerant temperature detected by the refrigerant temperature sensor 10. It is determined whether or not the icing condition is satisfied (step S1). If it is determined that the icing condition is satisfied, the measuring unit 24 measures time, and the icing determining unit 22 is measured by the measuring unit 24. The measured time is compared with the first set time stored in the first storage means 25, and it is determined whether or not the measured time has reached the first set time, for example, 30 hours (step S2). When it is determined that the first set time has not been reached, the process returns to step S1 again.

  Then, YES in step S1, NO in step S2, NO in step S1, YES in step S2, NO in step S2, and so on are repeated. In the process of step S2, the icing determination means 22 continuously establishes the icing condition in step S1. When it is determined that the measured time measured by the measuring unit 24 has reached the first set time stored in the first storage unit 25, the control unit 21 includes the geothermal circulation pump 15 and the load-side circulation pump. 18 is stopped, the heating operation is temporarily suspended, the opening degree of the expansion valve 6 is fully opened, for example, and the high-temperature refrigerant discharged from the compressor 4 is caused to flow into the refrigerant pipe 8 on the heat source side heat exchanger 7 side. The de-icing operation for de-icing the ice stacked on the surface of the refrigerant pipe 8 on the side heat exchanger 7 side is started (step S3).

  In step S3, the control means 21 determines whether or not a certain time, for example, 5 minutes has elapsed when the ice-breaking operation is started (step S4). (Step S5) When the ice-melting operation is completed, the measurement time of the measuring means 24 is cleared to zero, and driving of the underground heat circulation pump 15 and the load-side circulation pump 18 is started to resume the heating operation. is there.

  On the other hand, if it is determined in step S1 that the icing condition determining means 23 does not satisfy the icing condition, the measuring time of the measuring means 24 is set to zero (step S6), and the process returns to step S1 again. If the icing condition determining means 23 determines that the icing condition is not satisfied in step S1 during the process of repeating YES in step S1 and NO in step S2, the measuring means 24 is determined in step S6. The measurement time is set to zero, and the process returns to step S1 again. In addition, when heating operation is stopped, the measurement time of the measurement means 24 is cleared and becomes zero.

  In the deicing operation during the heating operation described above, when the icing determination means 22 determines that the refrigerant pipe 8 on the heat source side heat exchanger 7 side is frozen during the heating operation, the deicing operation is performed. Therefore, it is possible to prevent damage to functional components such as the refrigerant pipe 8 and the expansion valve 6 due to freezing, and to prevent generation of noise due to freezing.

  Further, in step S1, the measurement unit 24 can measure only the time during which the icing condition in which ice is stretched on the surface of the refrigerant pipe 8 of the heat source side heat exchanger 7 is established by the determination of the icing condition determining unit 23. In step S2, the icing determination means 22 determines that the refrigerant pipe 8 on the heat source side heat exchanger 7 side is frozen when the time measured by the measuring means 24 reaches the first set time set in advance. In addition, there is no useless ice-breaking operation, and the ice-breaking operation can be appropriately performed before ice is excessively stacked on the surface of the refrigerant pipe 8 on the heat source side heat exchanger 7 by providing a set time. It is. Further, by not performing useless ice-melting operation, the heating output can be stabilized, and the decrease in COP can be suppressed.

  When the control means 21 determines that the predetermined time set in step S4 has elapsed, the control means 21 ends the ice-breaking operation in step S5. When the detected temperature detected by the refrigerant temperature sensor 10 reaches a predetermined temperature that is previously derived and set by a test or the like, the ice-breaking operation may be terminated. If the refrigerant temperature sensor 10 detects the surface temperature of the refrigerant pipe 8 on the low pressure side, the refrigerant temperature sensor is in a state where ice is stretched on the refrigerant pipe 8 on the low pressure side during the ice-breaking operation. This is because the detected temperature detected by the refrigerant temperature sensor 10 gradually increases when the ice in the refrigerant pipe 8 on the low-pressure side melts, and the deicing operation is terminated. If the predetermined temperature is derived and set by a test or the like in advance, the ice-melting operation can be completed without the ice remaining on the surface of the refrigerant pipe 8 on the low-pressure side.

  Next, a second embodiment of the present invention shown in FIG. 1 and FIG. 4 will be described. In this embodiment, the same parts as those of the first embodiment described above are denoted by the same reference numerals, and a part of the description will be given. Omitted and different configurations and operations will be described.

  The control means 21 includes an icing judgment means 22 for judging whether or not the refrigerant pipe 8 on the heat source side heat exchanger 7 side is frozen during the heating operation, and a refrigerant temperature detected by the refrigerant temperature sensor 10 during the heating operation. Icing condition determining means 23 for determining whether or not the icing condition that the outside air temperature detected by the outside air temperature sensor 11 is higher than the refrigerant temperature detected by the refrigerant temperature sensor 10 is satisfied, and during the heating operation An integrating means 26 for integrating the time when the refrigerant temperature detected by the refrigerant temperature sensor 10 is equal to or lower than zero degrees and the outside air temperature detected by the outside air temperature sensor 11 is higher than the refrigerant temperature detected by the refrigerant temperature sensor 10, and heating operation. A second storage means 27 for storing a second set time as a reference for interrupting and starting the ice-breaking operation, and a state in which the integration time is stored in the integration means 26 when the heating operation is stopped, and A first integration reset unit that resets the integration time stored in the integration unit when a predetermined temperature at which the outside air temperature detected by the outside air temperature sensor 11 is higher than zero is detected for a predetermined time while the heating operation is stopped. It is what. Note that the second set time stored in the second storage means 27 is a time that is derived and set in advance by a test or the like, and is not set in seconds or minutes, but is set to a long time such as 30 hours. It is what.

  Here, the icing determination means 22 compares the accumulated time accumulated by the accumulation means 26 during the heating operation with the second set time stored in the second storage means 27, and the accumulated time is the second set time. The refrigerant pipe 8 on the heat source side heat exchanger 7 side from the expansion valve 6 to the compressor 4 is frozen, that is, ice is formed on the surface of the refrigerant pipe 8 on the heat source side heat exchanger 7 side. When the icing determination means 22 determines that the refrigerant pipe 8 on the heat source side heat exchanger 7 side is icing, the control means 21 controls the underground heat circulation pump 15 and the load side. The circulation pump 18 is stopped, the heating operation is temporarily stopped, the opening degree of the expansion valve 6 is fully opened or larger than that during the heating operation, and the high-temperature refrigerant discharged from the compressor 4 is supplied to the heat source side heat exchanger 7 side. The refrigerant pipe 8 flows into the refrigerant pipe 8 and is on the heat source side heat exchanger 7 side. It performs a thawing operation for thawing ice laminated to the surface. Note that the ice-removal operation is performed for a certain time, and this certain time is obtained by setting in advance a time necessary for melting the ice in the refrigerant pipe 8 on the heat source side heat exchanger 7 side by a test or the like.

Next, the operation of the ice-melting operation during the heating operation of the second embodiment shown in FIGS. 1 and 4 will be described based on the flowchart shown in FIG.
When the load terminal 16 instructs the heating of the air-conditioned space by the remote controller, the control means 21 starts driving the compressor 4, the geothermal circulation pump 15, and the load-side circulation pump 18, and the heating operation is started. Is done. Here, at the start of the heating operation, the underground heat circulation pump 15 starts to be driven at a preset constant rotation speed. When the heating operation is started, the load-side heat exchanger 5 exchanges heat between the circulating fluid for heating circulated by the load-side circulation pump 18 and the high-temperature and high-pressure refrigerant discharged from the compressor 4, and is heated. The circulating fluid for use is supplied to the load terminal 16 to heat the air-conditioned space, and in the heat source side heat exchanger 7, it is circulated by the underground heat circulation pump 15 and collects the underground heat through the underground heat exchanger 12. The heat medium and the low-temperature and low-pressure refrigerant discharged from the expansion valve 6 are heat-exchanged, and the refrigerant is heated and evaporated by underground heat.

  During the heating operation, the icing condition determination means 23 determines whether the refrigerant temperature detected by the refrigerant temperature sensor 10 is equal to or lower than zero degrees and the outside air temperature detected by the outside air temperature sensor 11 is higher than the refrigerant temperature detected by the refrigerant temperature sensor 10. It is determined whether or not the icing condition is satisfied (step S7). If it is determined that the icing condition is satisfied, the time is accumulated by the accumulating unit 26, and the icing determining unit 22 is accumulated by the accumulating unit 26. The accumulated time and the second set time stored in the second storage means 27 are compared, and it is determined whether or not the accumulated time has reached the second set time, for example, 30 hours (step S8). When it is determined that the second set time has not been reached, the process returns to step S7 again.

  Then, YES at step S7 → NO at step S8 → YES at step S7 → NO at step S8 → NO →... In step S8, the icing determination means 22 is integrated by the integration means 26 at step S8. When it is determined that the accumulated time has reached the second set time stored in the second storage unit 27, the control unit 21 stops the geothermal circulation pump 15 and the load-side circulation pump 18 and temporarily performs the heating operation. The high-temperature refrigerant discharged from the compressor 4 is interrupted and the opening degree of the expansion valve 6 is fully opened, for example, and flows into the refrigerant pipe 8 on the heat source side heat exchanger 7 side, and the refrigerant pipe 8 on the heat source side heat exchanger 7 side. The de-icing operation for de-icing the ice stacked on the surface is started (step S9).

  In step S9, when the ice-breaking operation is started, the control means 21 determines whether or not a predetermined time, for example, 5 minutes has elapsed (step S10). (Step S11) When the ice melting operation is completed, the integration time of the integration means 26 is cleared to zero, and the operation of the underground heat circulation pump 15 and the load side circulation pump 18 is started to resume the heating operation. is there.

  On the other hand, if the icing condition determining means 23 determines that the icing condition is not satisfied in step S7, the accumulating means 26 stores and accumulates the accumulated time accumulated so far (step S12), and the process of step S7 again. If the icing condition determining means 23 determines in step S7 that the icing condition is not satisfied during the repeated process of YES in step S7 and NO in step S8, the step S12 is also performed. Thus, the integrating means 26 holds and stores the integrated time accumulated so far, and returns to the processing of step S7 again.

  When the heating operation is stopped, the integrating means 26 holds and stores the integrated time accumulated so far, and when the heating operation is started again, integration starts from the integrated time held and stored in the integrating means 26. Is.

  In the deicing operation during the heating operation described above, in step S7, when the icing condition is satisfied according to the determination of the icing condition determining unit 23, the time is accumulated by the integrating unit 26, and when the icing condition is not satisfied, In step S12, the integration means 26 holds and stores the integration time accumulated so far. In step S8, the icing determination means 22 determines that the integration time in the integration means 26 has reached a preset second set time. By determining that the refrigerant pipe 8 on the side heat exchanger 7 side is frozen, for example, when the heating operation is stopped immediately before the accumulated time reaches the second set time, the heat source side heat exchanger 7 side Even if the ice remains on the surface of the refrigerant pipe 8, the ice-melting operation is performed when the accumulated time reaches the second set time. Therefore, the set time is provided so that ice is added to the refrigerant pipe 8 on the heat source side heat exchanger 7 side. Too much lamination Before appropriately can make thawed operation to and is intended never ice remains melted. Further, by not performing useless ice-melting operation, the heating output can be stabilized, and the decrease in COP can be suppressed.

  When the control means 21 determines that the predetermined time set in step S10 has elapsed, the control means 21 terminates the ice-breaking operation in step S11. When the detected temperature detected by the refrigerant temperature sensor 10 reaches a predetermined temperature that is previously derived and set by a test or the like, the ice-breaking operation may be terminated. If the refrigerant temperature sensor 10 detects the surface temperature of the refrigerant pipe 8 on the low pressure side, the refrigerant temperature sensor is in a state where ice is stretched on the refrigerant pipe 8 on the low pressure side during the ice-breaking operation. This is because the detected temperature detected by the refrigerant temperature sensor 10 gradually increases when the ice in the refrigerant pipe 8 on the low-pressure side melts, and the deicing operation is terminated. If the predetermined temperature is derived and set by a test or the like in advance, the ice-melting operation can be completed without the ice remaining on the surface of the refrigerant pipe 8 on the low-pressure side.

Next, the operation during the heating operation stop of the second embodiment shown in FIGS. 1 and 4 will be described based on the flowchart shown in FIG.
When the heating operation is stopped, the first integration reset unit 28 determines whether or not the integration time stored in the integration unit 26 is longer than zero time, that is, whether or not the integration time is stored in the integration unit 26. (Step S13), and if it is determined that the integration time stored in the integration means 26 is longer than zero hours, whether or not the outside air temperature detected by the outside air temperature sensor 11 is higher than a predetermined temperature, for example, 5 ° C. (Step S14), and if it is determined that the outside air temperature detected by the outside air temperature sensor 11 is higher than the predetermined temperature, the time is measured, the measured time is compared with a preset predetermined time, and the measured time is predetermined. It is determined whether or not a time, for example, 30 minutes has been reached (step S15), and if it is determined that the measurement time has not reached the predetermined time, the process returns to step S13 again. .

  Then, YES in step S14, NO in step S15, YES in step S14, NO in step S15, NO in step S15, and so on are repeated, and in the process of step S15, the first integration reset means 28 continues the conditions in step S14. When it is determined that the measurement time measured during the establishment has reached the predetermined time, the integration time stored in the integration means 26 is reset to zero (step S16).

  On the other hand, when the first integration reset unit 28 determines that the integration time stored in the integration unit 26 is zero time in step S13, the first integration reset unit 28 terminates without performing any operation. is there. If it is determined in step S14 that the condition is not satisfied by the first integration reset means 28, the measurement time is set to zero and the process returns to step S14 again. In step S14, YES → Even if it is determined in step S14 that the condition is not satisfied in step S14 during the NO repeat process in step S15, the measurement time is set to zero and the process returns to step S14 again. .

  When the heating operation is started again before the accumulated time stored in the integrating means 26 is reset to zero by the first integrating reset means 28 while the heating operation is stopped, the integrating means 26 The integration is started from the integration time stored in the integration means 26 when the heating operation is stopped.

  In the operation while the heating operation is stopped as described above, the accumulated time is stored in the integrating means 26, and the outside temperature detected by the outside temperature sensor 11 is higher than zero when the heating operation is stopped. When the predetermined time is detected, the integrated time stored in the integrating means 26 is reset by the first integrating reset means 28, so that when the heating operation is stopped, the outside air temperature is high, and the state is maintained for a predetermined time. In the case of continuing, even if ice is stretched in the refrigerant pipe 8 on the heat source side heat exchanger 7 side, the ice is naturally defrosted, and at that time, the stored accumulated time is reset to zero. Therefore, the determination of icing of the refrigerant pipe 8 on the heat source side heat exchanger 7 side is made more accurate, and useless deicing operation is not performed. Further, by not performing useless ice-melting operation, the heating output can be stabilized, and the decrease in COP can be suppressed.

  Next, a third embodiment of the present invention shown in FIGS. 1 and 7 will be described. In this embodiment, the same parts as those of the second embodiment described above are denoted by the same reference numerals, and a part of the description will be given. Omitted and different configurations and operations will be described.

  The control means 21 includes an icing judgment means 22 for judging whether or not the refrigerant pipe 8 on the heat source side heat exchanger 7 side is frozen during the heating operation, and a refrigerant temperature detected by the refrigerant temperature sensor 10 during the heating operation. Icing condition determining means 23 for determining whether or not the icing condition that the outside air temperature detected by the outside air temperature sensor 11 is higher than the refrigerant temperature detected by the refrigerant temperature sensor 10 is satisfied, and during the heating operation An integrating means 26 for integrating the time when the refrigerant temperature detected by the refrigerant temperature sensor 10 is equal to or lower than zero degrees and the outside air temperature detected by the outside air temperature sensor 11 is higher than the refrigerant temperature detected by the refrigerant temperature sensor 10, and heating operation. The second storage means 27 for storing the second set time serving as a reference for interrupting and starting the ice-breaking operation, and the integration time stored in the integration means 26 and when the heating operation is stopped When the outside air temperature detected by the temperature sensor 11 detects a predetermined temperature higher than zero degrees predetermined time in which and a first subtraction means 29 for subtracting the accumulated time stored in the accumulating means 26. Note that the second set time stored in the second storage means 27 is a time that is derived and set in advance by a test or the like, and is not set in seconds or minutes, but is set to a long time such as 30 hours. It is what.

  Here, the icing determination means 22 compares the accumulated time accumulated by the accumulation means 26 during the heating operation with the second set time stored in the second storage means 27, and the accumulated time is the second set time. The refrigerant pipe 8 on the heat source side heat exchanger 7 side from the expansion valve 6 to the compressor 4 is frozen, that is, ice is formed on the surface of the refrigerant pipe 8 on the heat source side heat exchanger 7 side. When the icing determination means 22 determines that the refrigerant pipe 8 on the heat source side heat exchanger 7 side is icing, the control means 21 controls the underground heat circulation pump 15 and the load side. The circulation pump 18 is stopped, the heating operation is temporarily stopped, the opening degree of the expansion valve 6 is fully opened or larger than that during the heating operation, and the high-temperature refrigerant discharged from the compressor 4 is supplied to the heat source side heat exchanger 7 side. The refrigerant pipe 8 flows into the refrigerant pipe 8 and is on the heat source side heat exchanger 7 side. It performs a thawing operation for thawing ice laminated to the surface. Note that the ice-removal operation is performed for a certain time, and this certain time is obtained by setting in advance a time necessary for melting the ice in the refrigerant pipe 8 on the heat source side heat exchanger 7 side by a test or the like.

  Next, regarding the operation of the ice melting operation during the heating operation of the third embodiment shown in FIG. 1 and FIG. 7, the operation of the ice melting operation during the heating operation of the second embodiment shown in FIG. Since the same operation is performed, the description thereof is omitted, and the operation while the heating operation is stopped will be described based on the flowchart shown in FIG.

  When the heating operation is stopped, the first subtraction unit 29 determines whether or not the integration time stored in the integration unit 26 is longer than zero time, that is, whether or not the integration time is stored in the integration unit 26. (Step S17), and if it is determined that the integration time stored in the integration means 26 is greater than zero time, whether or not the outside air temperature detected by the outside air temperature sensor 11 is higher than a predetermined temperature, for example, 5 ° C. (Step S18), and if it is determined that the outside air temperature detected by the outside air temperature sensor 11 is higher than the predetermined temperature, the time is measured, the measured time is compared with a preset predetermined time, and the measured time is predetermined. It is determined whether or not a time, for example, 30 minutes has been reached (step S19), and if it is determined that the measurement time has not reached the predetermined time, the process returns to step S18 again.

  Then, YES at step S18, NO at step S19, YES at step S18, NO at step S19, NO at step S19 is repeated, and in the process at step S19, the first subtracting means 29 continuously satisfies the condition at step S18. If it is determined that the measured time has reached the predetermined time, the accumulated time held and stored in the integrating means 26 is subtracted by a predetermined amount, for example, 1 hour (step S20), and the measured time is set to zero. Returning to the process of step S17, if it is determined in step S17 that the accumulated time after subtraction stored in the integrating means 26 is greater than zero time, the process proceeds to step S18 again.

  On the other hand, if the first subtracting means 29 determines in step S17 that the accumulated time stored in the accumulating means 26 is zero time, the first subtracting means 29 ends without performing any operation. If it is determined in step S18 that the condition is not satisfied by the first subtracting means 29, the measurement time is set to zero and the process returns to step S18 again. In step S18, YES → step If it is determined in step S18 that the condition is not satisfied by the first subtracting means 29 in the middle of the NO repeat processing in S19, the measurement time is set to zero and the process returns to step S18 again.

  If the heating operation is started again before the accumulated time stored in the integrating unit 26 is subtracted by the first subtracting unit 29 while the heating operation is stopped, the integrating unit 26 stops the heating operation. The integration is started from the integration time stored at the time of the operation, and after the integration time stored in the integration unit 26 is subtracted by the first subtraction unit 29 while the heating operation is stopped, the heating operation is performed again. Is started, the integration means 26 starts integration from the integration time after subtraction stored in the integration means 26.

  In the operation while the heating operation is stopped as described above, the accumulated time is stored in the integrating means 26, and the outside temperature detected by the outside temperature sensor 11 is higher than zero when the heating operation is stopped. When the predetermined time is detected, the accumulated time stored in the accumulating unit 26 is subtracted by a predetermined amount by the first subtracting unit 29, so that when the heating operation is stopped, the outside air temperature is high and the state is predetermined. When the time continues, even if ice is stretched in the refrigerant pipe 8 on the heat source side heat exchanger 7 side, the ice is naturally defrosted to some extent, and at that time, the stored accumulated time is subtracted. Therefore, it is possible to more accurately determine the icing of the refrigerant pipe 8 on the heat source side heat exchanger 7 side while taking into account the remaining ice from the refrigerant pipe 8 on the heat source side heat exchanger 7 side. There is nothing. Further, by not performing useless ice-melting operation, the heating output can be stabilized, and the decrease in COP can be suppressed.

  Next, a fourth embodiment of the present invention shown in FIGS. 1 and 9 will be described. In this embodiment, the same parts as those of the second embodiment described above are denoted by the same reference numerals, and a part of the description will be given. Omitted and different configurations and operations will be described.

  The control means 21 includes an icing judgment means 22 for judging whether or not the refrigerant pipe 8 on the heat source side heat exchanger 7 side is frozen during the heating operation, and a refrigerant temperature detected by the refrigerant temperature sensor 10 during the heating operation. Icing condition determining means 23 for determining whether or not the icing condition that the outside air temperature detected by the outside air temperature sensor 11 is higher than the refrigerant temperature detected by the refrigerant temperature sensor 10 is satisfied, and during the heating operation An integrating means 26 for integrating the time when the refrigerant temperature detected by the refrigerant temperature sensor 10 is equal to or lower than zero degrees and the outside air temperature detected by the outside air temperature sensor 11 is higher than the refrigerant temperature detected by the refrigerant temperature sensor 10, and heating operation. The second set time serving as a reference for interrupting and starting the ice-breaking operation and the reference for determining whether or not the accumulated time held and stored in the integrating means 26 is cleared to zero when the heating operation is stopped. 3 The second storage means 27 for storing the set time, and the integrated value integrated in the integrated means 26 when the integrated time accumulated by the integrating means 26 has not reached the third set time when the heating operation is stopped. And an integrated clearing means 30 for clearing the time. Note that the second set time and the third set time stored in the second storage means 27 are previously set by a test or the like, and the second set time is not in seconds or minutes, but in hours. For example, a long time such as 30 hours is set, and the third set time is not set in seconds or minutes, but is set in a long time such as 15 hours, for example, the second set time and the third set time. Has a relationship of second set time> third set time.

  Next, regarding the operation of the ice melting operation during the heating operation of the fourth embodiment shown in FIG. 1 and FIG. 9, the operation of the ice melting operation during the heating operation of the second embodiment shown in FIG. Since the same operation is performed, the description thereof is omitted, and the operation during the heating operation stop will be described based on the flowchart shown in FIG.

  When the heating operation is stopped, the integration clear unit 30 reaches the third set time that is set to be shorter than the second set time by the integration time held and stored in the integration unit 26 when the heating operation is stopped. (Step S21), and if it is determined that the accumulated time has reached the third set time, the operation is terminated without performing any operation. In step S21, the accumulated clearing means 30 causes the accumulated time to be If it is determined that the third set time has been reached, the accumulated time accumulated in the accumulation means 26 is cleared to zero (step S22).

  In the operation while the heating operation is stopped as described above, when the heating operation is stopped, if the integration time stored in the integration means 26 is a short time that does not reach the third set time, the inertia is generated when the heating operation is stopped. In this case, the ice stacked on the surface of the refrigerant pipe 8 on the heat source side heat exchanger 7 side is defrosted by the high-temperature refrigerant flowing in the refrigerant pipe 8 on the heat source side heat exchanger 7 side. By clearing the accumulated time to zero, it is possible to more accurately determine the freezing of the refrigerant pipe 8 on the heat source side heat exchanger 7 side without accumulating the time that does not need to be accumulated in the accumulation means 26. It can be performed, and there is no wasteful ice-breaking operation. Further, by not performing useless ice-melting operation, the heating output can be stabilized, and the decrease in COP can be suppressed.

  Next, a fifth embodiment of the present invention shown in FIGS. 1 and 11 will be described. In this embodiment, the same parts as those of the fourth embodiment described above are denoted by the same reference numerals, and a part of the description will be given. Omitted and different configurations and operations will be described.

  The control means 21 includes an icing judgment means 22 for judging whether or not the refrigerant pipe 8 on the heat source side heat exchanger 7 side is frozen during the heating operation, and a refrigerant temperature detected by the refrigerant temperature sensor 10 during the heating operation. Icing condition determining means 23 for determining whether or not the icing condition that the outside air temperature detected by the outside air temperature sensor 11 is higher than the refrigerant temperature detected by the refrigerant temperature sensor 10 is satisfied, and during the heating operation An integrating means 26 for integrating the time when the refrigerant temperature detected by the refrigerant temperature sensor 10 is equal to or lower than zero degrees and the outside air temperature detected by the outside air temperature sensor 11 is higher than the refrigerant temperature detected by the refrigerant temperature sensor 10, and heating operation. A second set time serving as a reference for interrupting and starting the ice-breaking operation, and a reference for determining whether or not to clear the accumulated time held and stored in the integrating means 26 to zero when the heating operation is stopped. Second storage means 27 for storing the third set time, and when the heating operation is stopped, if the integration time accumulated by the integration means 26 has not reached the third set time, the integration is performed by the integration means 26. The accumulated clear means 30 for clearing the accumulated time, and when the heating operation is stopped, the accumulated time accumulated by the accumulation means 26 has reached the third set time, and then the heating operation is started again. A second integration reset unit 31 that resets the integration time stored in the integration unit 26 when a predetermined temperature at which the outside air temperature detected by the outside air temperature sensor 11 is higher than zero is detected for a predetermined time during the heating operation stop. It is what. Note that the second set time and the third set time stored in the second storage means 27 are previously set by a test or the like, and the second set time is not in seconds or minutes, but in hours. For example, a long time such as 30 hours is set, and the third set time is not set in seconds or minutes, but is set in a long time such as 15 hours, for example, the second set time and the third set time. Has a relationship of second set time> third set time.

  Next, the operation of the ice-melting operation during the heating operation of the fifth embodiment shown in FIGS. 1 and 11 is the same as the above-described fourth embodiment, and the above-described second embodiment shown in FIG. Since the operation is the same as that of the ice-breaking operation during the heating operation, the description is omitted, and the operation while the heating operation is stopped will be described based on the flowchart shown in FIG.

  When the heating operation is stopped, the integration clear unit 30 reaches the third set time that is set to be shorter than the second set time by the integration time held and stored in the integration unit 26 when the heating operation is stopped. (Step S23), and if it is determined that the accumulated time has not reached the third set time, the accumulated time accumulated in the accumulating means 26 is cleared to zero (step S24). ).

  In step S23, the integration clear unit 30 has reached the third set time for the integration time held and stored in the integration unit 26, that is, the integration time stored in the integration unit 26 is longer than the third set time. When it is determined that the time is shorter than the second set time, the second integration reset unit 31 determines whether or not the outside air temperature detected by the outside air temperature sensor 11 is higher than a predetermined temperature higher than zero degree, for example, 5 ° C. ( In step S25), when it is determined that the outside air temperature detected by the outside air temperature sensor 11 is higher than a predetermined temperature, the time is measured, the measured time is compared with a predetermined time, and the measured time is a predetermined time, for example, 30. It is determined whether or not the minute has been reached (step S26). If it is determined that the measurement time has not reached the predetermined time, the process returns to step S25 again.

  Then, YES at step S25, NO at step S26, YES at step S25, NO at step S26, NO at step S26, etc. are repeated, and in the process at step S26, the second integration reset means 31 continues the condition at step S25. When it is determined that the measurement time measured during the establishment has reached the predetermined time, the integration time stored in the integration means 26 is reset to zero (step S27).

  On the other hand, if it is determined in step S25 that the condition is not satisfied by the second integration reset means 31, the measurement time is set to zero, and the process returns to step S25 again. In step S25, YES → Even if it is determined in step S25 that the condition is not satisfied by the second integration reset means 31 during the NO repeat process in step S26, the measurement time is set to zero and the process returns to step S25 again. .

  When the heating operation is stopped, the accumulated time held and stored in the integrating means 26 is longer than the third set time and shorter than the second set time. During the subsequent heating operation stop, the second accumulated reset means In the case where the heating operation is started again before the integration time stored in the integration unit 26 is reset to zero by 31, the integration unit 26 is stored in the integration unit 26 when the heating operation is stopped. Integration starts from the integration time.

  In the operation while the heating operation is stopped as described above, when the heating operation is stopped, if the integration time stored in the integration means 26 is a short time that does not reach the third set time, the inertia is generated when the heating operation is stopped. In this case, the ice stacked on the surface of the refrigerant pipe 8 on the heat source side heat exchanger 7 side is defrosted by the high-temperature refrigerant flowing in the refrigerant pipe 8 on the heat source side heat exchanger 7 side. By clearing the accumulated time to zero, it is possible to more accurately determine the freezing of the refrigerant pipe 8 on the heat source side heat exchanger 7 side without accumulating the time that does not need to be accumulated in the accumulation means 26. In addition, when the heating operation is stopped, the integration time accumulated by the integration means 26 has reached the third set time, and thereafter Heating operation opens again When a predetermined temperature at which the outside air temperature detected by the outside air temperature sensor 11 is higher than zero is detected for a predetermined time while the heating operation is stopped, the accumulated time stored in the integrating means 26 is reset by the second integrating reset means 31. As a result, when the heating operation is stopped and a high-temperature refrigerant flows into the refrigerant pipe 8 on the heat source side heat exchanger 7 side due to inertia, ice is formed on the surface of the refrigerant pipe 8 on the heat source side heat exchanger 7 side. Even if the melt remains, when the outside air temperature is high and the state continues for a predetermined time when the heating operation is stopped, the unmelted ice in the refrigerant pipe 8 on the heat source side heat exchanger 7 side is naturally At that time, the accumulated time stored in the accumulating means 26 is reset to zero by the second accumulating reset means 31, so that the determination of icing of the refrigerant pipe 8 on the heat source side heat exchanger 7 side is further performed. Accurate and useless ice luck It is that there is no be performed. Further, by not performing useless ice-melting operation, the heating output can be stabilized, and the decrease in COP can be suppressed.

  Next, a sixth embodiment of the present invention shown in FIG. 1 and FIG. 13 will be described. In this embodiment, the same parts as those of the fourth embodiment described above are denoted by the same reference numerals, and a part of the description will be given. Omitted and different configurations and operations will be described.

  The control means 21 includes an icing judgment means 22 for judging whether or not the refrigerant pipe 8 on the heat source side heat exchanger 7 side is frozen during the heating operation, and a refrigerant temperature detected by the refrigerant temperature sensor 10 during the heating operation. Icing condition determining means 23 for determining whether or not the icing condition that the outside air temperature detected by the outside air temperature sensor 11 is higher than the refrigerant temperature detected by the refrigerant temperature sensor 10 is satisfied, and during the heating operation An integrating means 26 for integrating the time when the refrigerant temperature detected by the refrigerant temperature sensor 10 is equal to or lower than zero degrees and the outside air temperature detected by the outside air temperature sensor 11 is higher than the refrigerant temperature detected by the refrigerant temperature sensor 10, and heating operation. The second set time serving as a reference for interrupting and starting the ice-breaking operation and the reference for determining whether or not the accumulated time held and stored in the integrating means 26 is cleared to zero when the heating operation is stopped. 3 The second storage means 27 for storing the set time, and the integrated value integrated in the integrated means 26 when the integrated time accumulated by the integrating means 26 has not reached the third set time when the heating operation is stopped. Accumulation clear means 30 for clearing the time, and heating operation until the heating time is started again after the accumulated time accumulated by the accumulation means 26 reaches the third set time when the heating operation is stopped. The second subtracting means 32 for subtracting the accumulated time stored in the accumulating means 26 when a predetermined temperature at which the outside air temperature detected by the outside air temperature sensor 11 is higher than zero is detected for a predetermined time during the stop. is there. Note that the second set time and the third set time stored in the second storage means 27 are previously set by a test or the like, and the second set time is not in seconds or minutes, but in hours. For example, a long time such as 30 hours is set, and the third set time is not set in seconds or minutes, but is set in a long time such as 15 hours, for example, the second set time and the third set time. Has a relationship of second set time> third set time.

  Next, the operation of the ice-melting operation during the heating operation of the sixth embodiment shown in FIGS. 1 and 13 is the same as the above-described fourth embodiment, and the above-described second embodiment shown in FIG. Since the operation is the same as that of the ice-breaking operation during the heating operation, the description will be omitted, and the operation while the heating operation is stopped will be described based on the flowchart shown in FIG.

  When the heating operation is stopped, the integration clear unit 30 reaches the third set time that is set to be shorter than the second set time by the integration time held and stored in the integration unit 26 when the heating operation is stopped. (Step S28), if it is determined that the accumulated time has not reached the third set time, the accumulated time accumulated in the accumulating means 26 is cleared to zero (step S29). ).

  In step S28, the integration clear unit 30 has reached the third set time for the integration time held and stored in the integration unit 26, that is, the integration time stored in the integration unit 26 is longer than the third set time. If it is determined that the time is shorter than the second set time, the second subtracting means 32 determines whether or not the integrated time stored in the integrating means 26 is longer than zero time, that is, the integrated time is stored in the integrating means 26. Is determined (step S30), and if it is determined that the integration time stored in the integration means 26 is greater than zero hours, the outside air temperature detected by the outside air temperature sensor 11 is a predetermined temperature higher than zero degrees, for example, 5 ° C. It is determined whether or not the temperature is higher (step S31), and if it is determined that the outside air temperature detected by the outside air temperature sensor 11 is higher than a predetermined temperature, the time is measured, and a predetermined time set in advance as the measurement time. And whether or not the measurement time has reached a predetermined time, for example, 30 minutes (step S32), and if it is determined that the measurement time has not reached the predetermined time, the process returns to step S31. Return to processing.

  Then, YES in step S31, NO in step S32, YES in step S31, NO in step S32, NO in step S32 are repeated, and in the process in step S32, the second subtracting means 32 continuously satisfies the condition in step S31. If it is determined that the measured time has reached a predetermined time, the integrated time stored in the integrating means 26 is subtracted by a predetermined amount, for example, 1 hour (step S33), and the measured time is set to zero. Returning to the process of step S30, if it is determined in step S30 that the accumulated time after subtraction stored in the accumulating means 26 is greater than zero time, the process proceeds to step S31 again.

  On the other hand, when the second subtracting means 32 determines in step S30 that the accumulated time stored in the accumulating means 26 is zero time, the second subtracting means 32 ends its operation. If it is determined in step S31 that the condition is not satisfied by the second subtracting means 32, the measurement time is set to zero and the process returns to step S31 again. In step S31, YES → step Even if it is determined in step S31 that the condition is not satisfied by the second subtracting means 32 during the NO repeat processing in S32, the measurement time is set to zero, and the process returns to the step S31 again.

  When the heating operation is stopped, the integration time held and stored in the integration means 26 is longer than the third set time and shorter than the second set time. During the subsequent heating operation stop, the second subtraction means 32 When the heating operation is started again before the integration time stored in the integration unit 26 is subtracted, the integration unit 26 calculates the integration during the icing condition from the integration time stored when the heating operation is stopped. In the case where the heating operation is started again after the accumulated time stored in the integrating means 26 is subtracted by the second subtracting means 32 while the heating operation is stopped. 26 starts the integration from the integration time after subtraction stored in the integration means 26.

  In the operation while the heating operation is stopped as described above, when the heating operation is stopped, if the integration time stored in the integration means 26 is a short time that does not reach the third set time, the inertia is generated when the heating operation is stopped. In this case, the ice stacked on the surface of the refrigerant pipe 8 on the heat source side heat exchanger 7 side is defrosted by the high-temperature refrigerant flowing in the refrigerant pipe 8 on the heat source side heat exchanger 7 side. By clearing the accumulated time to zero, it is possible to more accurately determine the freezing of the refrigerant pipe 8 on the heat source side heat exchanger 7 side without accumulating the time that does not need to be accumulated in the accumulation means 26. The accumulated time stored in the accumulating means 26 reaches the third set time when the heating operation is stopped, and after that, the wasteful ice-free operation is not performed. Heating operation started again When a predetermined temperature at which the outside air temperature detected by the outside air temperature sensor 11 is higher than zero is detected for a predetermined time while the heating operation is stopped, the second subtracting means 32 subtracts a predetermined amount of the accumulated time stored in the integrating means 26. By doing so, when the high temperature refrigerant flows into the refrigerant pipe 8 on the heat source side heat exchanger 7 side due to inertia and the heating operation is stopped, the ice melts on the surface of the refrigerant pipe 8 on the heat source side heat exchanger 7 side. Even if it remains, if the outside air temperature is high and the state continues for a predetermined time while the heating operation is stopped, the ice remaining in the refrigerant pipe 8 on the heat source side heat exchanger 7 side is somewhat natural. When the ice is melted, the accumulated time stored in the accumulating means 26 is subtracted by the second subtracting means 32. Therefore, the heat source side heat is taken into account while taking into account the remaining ice melt in the refrigerant pipe 8 on the heat source side heat exchanger 7 side. Judgment of freezing of refrigerant pipe 8 on exchanger 7 side Ri to accurate, but is not possible to perform useless thaw operation. Further, by not performing useless ice-melting operation, the heating output can be stabilized, and the decrease in COP can be suppressed.

  The present invention is not limited to the first to sixth embodiments described above. In the first to sixth embodiments, the expansion valve 6 is fully opened during the ice-breaking operation, and the compressor 4 is used. Although the discharged high-temperature refrigerant is allowed to flow to the heat source side heat exchanger 7, as shown in FIG. 15, a bypass pipe 33 that bypasses the load side heat exchanger 5 and the expansion valve 6 in the heat pump circuit 9, and its bypass An on-off valve 34 for opening and closing the pipe 33, and opening the on-off valve 34 during the ice-breaking operation so that the high-temperature refrigerant discharged from the compressor 4 flows directly into the heat source side heat exchanger 7 to heat the heat source side heat. A high-temperature refrigerant may be allowed to flow through the exchanger 7, and further, as shown in FIG. 16, the heat pump circuit 9 causes the heat source side heat exchanger 7 to function as an evaporator during heating operation, and load side heat exchange. Function as a condenser, heat the load side, During operation, the heat source side heat exchanger 7 functions as a condenser, and the load side heat exchanger 5 functions as an evaporator to switch the heat source side to heat so as to heat the heat source side heat. The four-way valve 35 is switched so that the exchanger 7 functions as a condenser, and the high-temperature refrigerant discharged from the compressor 4 is caused to flow directly into the heat source side heat exchanger 7 as indicated by the dotted arrows in the figure, A high temperature refrigerant may be allowed to flow through the heat source side heat exchanger 7.

  Further, the present invention is not limited to the first to sixth embodiments described above. In the first to sixth embodiments, a plurality of underground heat exchangers 12 embedded in the ground G are used. Are connected in parallel with each other, but a plurality of underground heat exchangers 12 may be connected in series with each other, and a desired heat collection from the ground G without embedding a plurality of underground heat exchangers 12. If it is possible, only one underground heat exchanger 12 may be embedded.

  In addition, the present invention is not limited to the first to sixth embodiments described above. In the first to sixth embodiments, the room is an air-conditioned space by the load terminal 16 such as a floor heating panel. Although the heating medium circulation type heating operation for heating the vehicle is a load operation, an indoor unit (not shown) having a load-side heat exchanger 5 is provided in a room that is an air-conditioned space. Heating operation in which the discharged high-temperature refrigerant directly exchanges heat with room air and heats the room by blowing air may be used as load operation, and a hot water storage tank (for storing hot water used for hot water supply or the like by the load terminal 16) The heating operation for boiling hot water in the hot water storage tank may be a load operation, and various modifications are possible without departing from the scope of the present invention, and this is not disturbed. .

  Further, the present invention is not limited to the first to sixth embodiments described above. In the first to sixth embodiments, the icing determination means 22 is a refrigerant temperature detected by the refrigerant temperature sensor 10. Based on the above, it is determined whether or not the refrigerant pipe 8 of the heat source side heat exchanger 7 is frozen. As shown in FIG. 17, instead of the refrigerant temperature sensor 10, the heat source side heat exchanger 7 An underground temperature sensor 36 is provided as an underground temperature detecting means for detecting the temperature of the heat medium flowing out and flowing into the underground heat exchanger 12, and the icing determination means 22 is detected by the underground temperature sensor 36. Whether or not the refrigerant pipe 8 of the heat source side heat exchanger 7 is frozen may be determined based on the heat medium temperature to be detected and the outside air temperature detected by the outside air temperature sensor 11. This is a temperature in which the temperature of the heat medium flowing out from the heat source side heat exchanger 7 approximates the refrigerant temperature flowing into the heat source side heat exchanger 7, and the refrigerant temperature on the heat source side heat exchanger 7 side from the heat medium temperature. The icing determination means 22 can reliably determine the icing of the refrigerant pipe 8 of the heat source side heat exchanger 7 by using the heat medium temperature detected by the underground temperature sensor 36. It can be done.

DESCRIPTION OF SYMBOLS 4 Compressor 5 Load side heat exchanger 6 Expansion valve 7 Heat source side heat exchanger 8 Refrigerant piping 9 Heat pump circuit 10 Refrigerant temperature sensor 11 Outside air temperature sensor 12 Ground heat exchanger 13 Heat medium piping 14 Ground heat circulation circuit 15 Ground Medium heat circulation pump 22 Freezing judgment means 24 Measuring means 26 Accumulating means 28 First accumulating reset means 29 First subtracting means 30 Accumulating clear means 31 Second accumulating reset means 32 Second subtracting means 36 Underground temperature sensor

Claims (9)

  A compressor, a load-side heat exchanger, a decompression means, a heat pump circuit in which a heat source-side heat exchanger is annularly connected by a refrigerant pipe, an underground heat exchanger embedded in the ground, the underground heat exchanger, A ground heat circulation circuit in which the heat source side heat exchanger is annularly connected by a heat medium pipe and a ground heat circulation pump that circulates the heat medium in the ground heat circulation circuit. A ground heat heat pump device that performs a load operation of heating the load side by collecting the ground heat with a heater and causing the heat source side heat exchanger to function as an evaporator and causing the load side heat exchanger to function as a condenser In this embodiment, there is provided icing judgment means for judging whether or not the refrigerant pipe on the heat source side heat exchanger side is frozen, and the refrigerant pipe on the heat source side heat exchanger side is provided by the icing judgment means during the load operation. If it is determined that it is frozen, the heat source side heat exchanger Geothermal Heat Pump apparatus being characterized in that to perform the deicing operation to de-ice by passing a high-temperature refrigerant to the refrigerant pipe.   The ground heat heat pump device according to claim 1, wherein a refrigerant temperature detecting means for detecting a temperature of the refrigerant on the heat source side heat exchanger side, an outside air temperature detecting means for detecting an outside air temperature, and during the load operation, Measuring means for measuring a time when the refrigerant temperature detected by the refrigerant temperature detecting means is equal to or lower than zero degrees and the outside air temperature detected by the outside air temperature detecting means is higher than the refrigerant temperature detected by the refrigerant temperature detecting means; The freezing determination means is configured to determine that the refrigerant pipe on the heat source side heat exchanger side is frozen when the measurement time in the measurement means reaches a preset first set time. apparatus.   The ground heat heat pump device according to claim 1, wherein a refrigerant temperature detecting means for detecting a temperature of the refrigerant on the heat source side heat exchanger side, an outside air temperature detecting means for detecting an outside air temperature, and during the load operation, An integrating means for integrating the time when the refrigerant temperature detected by the refrigerant temperature detecting means is zero degrees or less and the outside air temperature detected by the outside air temperature detecting means is higher than the refrigerant temperature detected by the refrigerant temperature detecting means; The freezing determination means is configured to determine that the refrigerant pipe on the heat source side heat exchanger side is frozen when the integration time in the integration means reaches a preset second set time. apparatus.   The geothermal heat pump device according to claim 3, further comprising a first integration reset unit that resets an integration time stored in the integration unit, wherein the first integration reset unit is configured to stop the outside air temperature during the load operation stop. A geothermal heat pump device that resets the accumulated time stored in the integrating means when a predetermined temperature at which the outside air temperature detected by the detecting means is detected is higher than zero degree for a predetermined time.   4. The underground heat pump device according to claim 3, further comprising first subtracting means for subtracting the accumulated time stored in the accumulating means, wherein the first subtracting means detects the outside air temperature detecting means while the load operation is stopped. A geothermal heat pump device that subtracts the accumulated time stored in the accumulating means when a predetermined temperature at which the outside air temperature detected is higher than zero is detected for a predetermined time.   The geothermal heat pump device according to claim 3, wherein when the load operation is stopped, if the accumulated time accumulated by the integrating means has not reached a preset third set time, the integrating means is integrated. A geothermal heat pump device provided with a clearing means for clearing the accumulated time.   The geothermal heat pump device according to claim 6, further comprising a second integration reset unit that resets the integration time stored in the integration unit, and the integration time integrated by the integration unit when the load operation is stopped. When the third set time has been reached and a predetermined temperature at which the outside air temperature detected by the outside air temperature detecting means is higher than zero is detected for a predetermined time during the subsequent stop of the load operation, the second total resetting means A geothermal heat pump device that resets the accumulated time stored in the integrating means.   The ground heat heat pump device according to claim 6, further comprising a second subtracting unit that subtracts the accumulated time stored in the integrating unit, and when the load operation is stopped, the accumulated time accumulated by the integrating unit is When the third set time has been reached and a predetermined temperature at which the outside air temperature detected by the outside air temperature detecting means is higher than zero is detected for a predetermined time while the load operation is stopped thereafter, the second subtracting means A geothermal heat pump device in which the accumulated time stored in the means is subtracted.   The underground heat heat pump device according to any one of claims 2 to 8, wherein a heat medium flowing out of the heat source side heat exchanger and flowing into the underground heat exchanger is used instead of the refrigerant temperature detecting means. A geothermal heat pump device provided with underground temperature detecting means for detecting temperature.

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