JP6549296B2 - Combined heat source heat pump system - Google Patents

Description

  The present invention relates to a combined heat source heat pump apparatus, and more particularly to a combined heat source heat pump apparatus using air heat and ground heat as heat sources.

  Recently, "ground heat" stored in the ground by the heat of the sun has a small temperature change throughout the year, so a ground heat heat pump device that can effectively use this ground heat energy is attracting attention. In particular, the ground source heat pump system has a characteristic that stable heating can be performed even in a cold region where winter cold conditions are severe.

DESCRIPTION OF RELATED ART Conventionally, the heat pump cycle apparatus which connected the underground heat source and the air heat source in parallel is known (for example, patent document 1).
For example, when performing a heating operation, the heat pump cycle device described in Patent Document 1 selects either the air heat source or the underground heat source according to the outside air temperature and uses a heat source with high heat collection efficiency. Thus, the heat medium (circulating fluid) on the heat radiation terminal side is heated.

JP, 2006-125769, A (paragraph 0008, refer to Drawing 1)

  However, in the heat pump cycle device described in Patent Document 1, since either the air heat source or the underground heat source is used as the heat source, the outside air temperature is low particularly in a cold region in winter, and the heating load becomes excessive. In this case, it is assumed that the heating output tends to be short.

  Moreover, in the heat pump cycle apparatus (for example, Japanese Patent Application No. 2012-175620 which is undisclosed) in which the geothermal heat heat pump apparatus and the air heat heat pump apparatus are connected in series, cool air If the refrigerant temperature frequently does not rise due to short circuiting, refrigerant gas leakage or debris accumulation in the heat exchanger, the defrosting operation is frequently entered and the heating capacity is reduced and efficient heating can not be obtained Had the task to say.

  The present invention has been made in view of such a background, and if a defrosting operation is frequently performed, good heating can be continuously performed by switching a heat pump as a main power source. It is an object of the present invention to provide a combined heat source heat pump system.

  In order to solve the above-mentioned subject, this invention is the 1st heating heat exchanger as a heating circulation circuit which has a heating circulation pump which circulates circulating fluid to a heat dissipation terminal, and a condenser arranged in this heating circulation circuit, A second heating heat exchanger as a condenser disposed in the heating circulation circuit, and a first compressor for compressing refrigerant circulating in the circuit by using underground heat as a heat source; A first heat pump circuit for heating the circulating fluid and a second compressor for compressing a refrigerant circulating in the circuit using air heat as a heat source to heat the circulating fluid via the second heating heat exchanger A second heat pump circuit, a terminal temperature sensor for measuring the temperature of the circulating fluid, an outside air temperature sensor for measuring the outside air temperature, and a control device for controlling the operation, wherein the first heating heat exchanger Second heat of heat in the heating circuit In the complex heat source heat pump apparatus disposed in series on the upstream side of the converter and performing a heating operation for heating the circulating fluid, the control device determines that the outside air temperature is higher than a predetermined reference temperature. 2) Drive the second compressor of the heat pump circuit as a main power source and drive the first compressor of the first heat pump circuit as an auxiliary power source, and when the outside air temperature is lower than a predetermined reference temperature, (1) The first compressor of the heat pump circuit is driven by the main power source, and the second compressor of the second heat pump circuit is driven by the auxiliary power source, and the temperature of the heated circulating fluid reaches the set target temperature And reducing the compressor rotational speed of the auxiliary power source earlier than the main power source, wherein the controller uses the second compressor of the second heat pump circuit as the main power source and the first heat pump circuit. In the heating operation of driving the first compressor of the pump circuit as an auxiliary power source, the frequency of the defrosting operation of the second heat pump circuit is detected, and the detected frequency of the defrosting operation is set in advance. In the case where the frequency is equal to or more than the predetermined frequency, the first compressor of the first heat pump circuit is switched to control as the main power source and the second compressor of the second heat pump circuit is switched as the auxiliary power source. It is.

  The combined heat source heat pump apparatus according to the present invention controls the ground heat heat pump apparatus that does not require the defrosting operation to be the main power source when the defrosting operation is frequently performed, and therefore suppresses the decrease in the heating capacity. Good heating can be obtained continuously.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external appearance block diagram which shows the main unit of the compound heat source heat pump apparatus which concerns on embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the whole structure of the compound heat source heat pump apparatus which concerns on embodiment of this invention. It is a graph which shows the basic operation | movement at the time of low load in start-up operation control which concerns on embodiment of this invention, (a) shows transition of the rotational speed of two compressors, (b) is temperature of circulating fluid. Show the transition. It is a graph which shows the basic operation | movement at the time of high load in start-up operation control which concerns on embodiment of this invention, (a) shows transition of the rotational speed of two compressors, (b) is temperature of circulating fluid. Show the transition. 5 is a flowchart showing an operation in the start-up operation control according to the first embodiment of the present invention. The flowchart which shows the operation | movement in the starting operation control which concerns on the 2nd Example of this invention. The flowchart which shows the switching operation | movement of the main and auxiliary power source in the normal driving control which concerns on embodiment of this invention. The flowchart for demonstrating the operation | movement in the normal driving control which concerns on embodiment of this invention.

The configuration of the combined heat source heat pump apparatus 1 according to the embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2 as appropriate.
As shown in FIG. 1, the combined heat source heat pump apparatus 1 includes a heating heat exchange unit 3 that circulates a circulating fluid L (for example, warm water) as a heat medium to the heat radiation terminal 2 and underground heat using ground heat as a heat source. The heat pump device 4, an air heat pump device 5 using heat of air as a heat source, a control device 6 (61, 62) for controlling the operation, and a remote control 60 sending a signal to the control device 6 are provided.

  As shown in FIG. 2, the complex heat source heat pump apparatus 1 is a hybrid type heat pump apparatus in which the heat pump apparatus 4, which is a first heat pump circuit, and the air heat pump apparatus 5, which is a second heat pump circuit, are connected in series. Although it can be made to function as a heating device and a cooling device, in the following embodiments, components and operations when used mainly as a heating device will be described.

  The heat radiation terminal 2 (21, 22) is a floor heating panel or panel convector for heating the air conditioned space as shown in FIG. 2, and a plurality of heat radiation terminals can be disposed, but the quantity and specifications are particularly limited. Since it is not a thing, detailed explanation is omitted.

  The heating heat exchange unit 3 includes a heating circulation circuit 31 for circulating the circulating fluid L to the heat radiation terminal 2, a heating circulation pump 32 disposed in the heating circulation circuit 31 for pumping the circulating fluid L, and a circulation for supplying the heat radiation terminal 2. The thermal valve 33 (33a, 33b) for controlling the supply of the liquid L, the terminal temperature sensor 34 for measuring the temperature of the circulating liquid L flowing out from the heat dissipation terminal 2 and adjusting the pressure in the flow path And a cistern 35.

The heating circulation circuit 31 includes a first heating heat exchanger 41 as a condenser of the geothermal heat pump device 4 and a second heating heat exchanger 51 as a condenser of the air heat heat pump device 5.
The first heating heat exchanger 41 is disposed in series upstream of the second heating heat exchanger 51 in the heating circuit 31.

  With this configuration, the circulation fluid L heated by the first heating heat exchanger 41 is further heated by the second heating heat exchanger 51 in an environment where the outside air temperature is low and the heating load is excessive in cold regions in winter, etc. As a result, the circulating fluid L that heats the heat radiation terminal 2 can quickly reach the target temperature.

  The terminal temperature sensor 34 is disposed on the upstream side of the first heating heat exchanger 41 in the heating circulation circuit 31 and detects the temperature of the circulating fluid L flowing out from the heat radiation terminal 2 so as to obtain comfortable heating. The device 6 controls.

  The geothermal heat pump 4 includes a refrigerant circulation path 42 for supplying a high temperature refrigerant C1 (for example, an HFC refrigerant such as R410A or R32, a carbon dioxide refrigerant) to the first heating heat exchanger 41, and a first heating heat exchange The first compressor 43, which compresses the refrigerant C1 to the compressor 41 and sends it out, the temperature sensor 42a, which detects the temperature of the refrigerant C1 compressed by the first compressor 43, and the first heat exchanger 41 The first expansion valve 44 that decompresses the refrigerant C1, the temperature sensor 42b that detects the temperature of the low temperature refrigerant C1 decompressed by the first expansion valve 44, and the low temperature refrigerant C1 decompressed by the first expansion valve 44 are heated Underground heat source heat exchanger 45, a heat medium circulation passage 46 for supplying the heat medium H1 (for example, antifreeze liquid) to the ground heat source heat exchanger 45, and earth for pumping the heat medium H1 of the heat medium circulation passage 46 Heat circulation pump 47 and heat medium circulation path The underground heat exchanger 48 arranged in 6, and a cistern 49 for adjusting the pressure of the heating medium circulation path 46.

With this configuration, in the underground heat source heat exchanger 45 in the underground heat pump 4, the heat medium H1 circulating through the heat medium circulation passage 46 and the refrigerant C1 circulating through the refrigerant circulation passage 42 flow oppositely Because the exchange is performed, the underground heat exchanger 48 transfers the underground heat collected to the refrigerant C1. Then, the refrigerant C1 is compressed by the first compressor 43 and supplied to the first heating heat exchanger 41.
In the first heating heat exchanger 41, the high-temperature refrigerant C1 compressed by the first compressor 43 and the low-temperature circulating fluid L returned from the heat radiation terminal 2 through the heating circulation circuit 31 flow opposite to each other to generate heat The exchange is performed to heat the circulating fluid L.

The air heat heat pump apparatus 5 includes a refrigerant circulation path 52 for supplying a high temperature refrigerant C2 (for example, an HFC refrigerant such as R410A or R32, a carbon dioxide refrigerant) to the second heating heat exchanger 51, and a second heating heat exchanger 51, a second compressor 53 for compressing and sending out the refrigerant C2, a temperature sensor 52a for detecting the temperature of the refrigerant C2 compressed by the second compressor 53, and the refrigerant flowing out of the second heating heat exchanger 51 A second expansion valve 54 for depressurizing C2, a temperature sensor 52b for detecting the temperature of the low temperature refrigerant C2 depressurized by the second expansion valve 54, and a low temperature refrigerant C2 decompressed by the second expansion valve 54 are heated The air heat source heat exchanger 55, an outside air temperature sensor 57 for detecting the outside air temperature, and a four-way valve 58 that switches the flow direction of the refrigerant C2 in the refrigerant circuit 52 to switch heating and cooling.
The air heat source heat exchanger 55 exchanges heat between the air blown by the blower fan 56 and the refrigerant C2 to heat the refrigerant C2.

  With this configuration, in the second heat transfer heat exchanger 51 of the air heat heat pump apparatus 5, the high temperature refrigerant C 2 compressed by the second compressor 53 and the first heat transfer heat that is disposed upstream of the heating circuit 31. The circulating fluid L flowing out of the exchanger 41 flows oppositely to perform heat exchange, and the circulating fluid L heated by the first heating heat exchanger 41 can be further heated.

  The control device 6 includes a ground heat heat pump control device 61 that controls the operation of the heating heat exchange unit 3 and the ground heat heat pump device 4, and an air heat heat pump control device 62 that controls the operation of the air heat heat pump device 5. Have. The control device 6 can control the operation of the combined heat source heat pump device 1 in response to signals from the outdoor air temperature sensor 57, temperature sensors such as the temperature sensors 42a and 42b, and the remote control 60.

  The control device 6 executes startup operation control (see FIGS. 3 and 4) until the temperature of the circulating fluid L reaches the target temperature set by the remote control 60 or the like at the start of heating operation, and the target temperature After reaching the normal operation control (see FIG. 7).

<Start-up operation control>
Start-up operation control widely includes control operations from start-up to transition to normal operation control (see FIG. 7), and until the temperature of circulating fluid L reaches a set target temperature, the underground heat pump system Both 4 and the air heat pump apparatus 5 are driven to perform control so that the target temperature can be reached quickly.

  At this time, instead of driving both the first compressor 43 of the geothermal heat pump device 4 and the second compressor 53 of the air thermal heat pump device 5 at the maximum rotational speed, two compressors according to the outside air temperature One of (43, 53) is driven as a main power source having a high rotational speed, and the other is driven as an auxiliary power source having a low rotational speed.

Specifically, when the outside air temperature detected by the outside air temperature sensor 57 is higher than a predetermined reference temperature (for example, 5 degrees), the air thermal heat pump device 5 has a higher heat collection efficiency, and thus the second compressor The first compressor 43 is driven as an auxiliary power source with 53 as a main power source.
On the other hand, when the outside air temperature is lower than a predetermined reference temperature (for example, 5 degrees), the ground heat pump 4 has higher heat collection efficiency, so the first compressor 43 is used as a main power source and the second compression is performed. The machine 53 is driven as an auxiliary power source.

  At this time, the compressor HP1 of the main power source is driven at, for example, the maximum rotation speed (for example, 90 rps), and the compressor HP2 of the auxiliary power source is, for example, about half the rotation speed (for example, 50 rps) Set low to drive. The maximum rotational speed may be appropriately set in consideration of the specifications of the heat pump apparatus and the performance of the compressor, and may be set to the maximum rotational speed of the compressor or lower than the maximum rotational speed.

  Subsequently, the basic operation in the start-up operation control will be described with reference to FIGS. 3 and 4. FIG. 3 is a graph for explaining the basic operation when the heating load at the heat radiation terminal 2 is low, where (a) shows the transition of the rotational speed of the two compressors HP1 and HP2, and (b) shows the circulation. It shows the transition of the temperature of the solution. FIG. 4 is a graph for explaining the basic operation when the heating load in the heat radiation terminal 2 is high, where (a) shows the transition of the rotational speed of the two compressors HP1 and HP2, and (b) shows the circulation. It shows the transition of the temperature of the solution.

  The heating load is the load (heat quantity) necessary to heat the air-conditioned space (not shown) to be heated, and the specifications of the heat dissipation terminal 2, the rotational speed of the compressor, the outside temperature, and the like are set. It becomes settled by target temperature etc.

[Mainly basic operation A at low load A]
As shown in FIG. 3, when the heating load at the heat radiation terminal 2 (see FIG. 2) is low, the complex heat source heat pump device 1 has a rotational speed of the compressor HP2 of the auxiliary power source than the compressor HP1 of the main power source. Is set low to execute start-up operation control, and when the target temperature (see FIG. 3 (b)) is reached, the compressor HP2 of the auxiliary power source is stopped to start operation control from normal operation (see FIG. Go to 7).

  Specifically, after starting (t0), the control device 6 drives the compressor HP1 of the main power source at 90 rps (t2), and drives the compressor HP2 of the auxiliary power source at 50 rps (t1). When controller 6 determines that the temperature of circulating fluid L has reached the target temperature by terminal temperature sensor 34 (see FIG. 2) at time t3, controller 6 stops compressor HP2 of the auxiliary power source, and the main power source The compressor HP1 shifts to normal operation control (see FIG. 7) and manages it.

[Mainly basic operation B, C at high load]
When the heating load is high, the control device 6 executes the following basic operations B and C by selecting or combining them.
The basic operation B is, as shown in FIG. 4, every predetermined elapsed time (t3 to t4, t4 to t5, for example, every one minute) after a predetermined rise time (t0 to t3, for example, 3 minutes). The temperature rise rate of the temperature of the circulating fluid L within the elapsed time is determined by the terminal temperature sensor 34 (see FIG. 2), and the temperature rise rate does not reach a predetermined threshold (for example, 3 In this case, the control operation is to drive the compressor HP2 of the auxiliary power source set low at the time of start up to a preset maximum rotation speed (for example, 90 rps) and drive.

  The basic operation C is whether or not the temperature of the circulating fluid L has reached the target temperature (see FIG. 4B) by the terminal temperature sensor 34 after the predetermined target time has elapsed (t0 to t5, eg, 10 minutes). If the temperature of the circulating fluid L does not reach the target temperature, the compressor HP2 of the auxiliary power source set low at startup is increased to a preset maximum rotation speed (for example, 90 rps). Control operation.

Specifically, after starting (t0), the control device 6 drives the compressor HP1 of the main power source at 90 rps (t2), and drives the compressor HP2 of the auxiliary power source at 50 rps (t1). Then, after the predetermined target time has elapsed (t0 to t5, for example, 10 minutes), the control device 6 sets the temperature of the circulating fluid L to the target temperature (FIG. 4B) by the terminal temperature sensor 34 (see FIG. 2). Determine if the reference has been reached.
At time t5, the temperature of the circulating fluid L does not reach the target temperature, but the compressor HP2 of the auxiliary power source set low at startup is already increased to the maximum rotation speed (for example, 90 rps) at time t4 to drive At time t5, the rotational speed is maintained at 90 rps.

  In the present embodiment, the compressor HP2 of the auxiliary power source is increased to the maximum rotation speed (90 rps the same as the compressor HP1 of the main power source), but the invention is not limited thereto. The rotation speed may be lower than the machine HP1.

Subsequently, first and second examples of the combined heat source heat pump device 1 according to the embodiment of the present invention will be described with reference to FIGS. 5 to 7.
First Embodiment
The first embodiment is a control operation for executing the basic operations A, B and C in the start-up operation control.
The control device 6A according to the first embodiment, as shown in FIG. 5, after the start of operation (S1), the outside air temperature detected by the outside air temperature sensor 57 and a predetermined reference temperature (for example, 5 degrees) set in advance. To determine the main power source compressor HP1 and the auxiliary power source compressor HP2 (S2). Thereafter, the basic operation A is executed, and the compressor HP1 of the main power source is driven at 90 rps, and the compressor HP2 of the auxiliary power source is driven at 50 rps (S3).

  The control device 6A compares the temperature of the circulating fluid L returned from the heat dissipation terminal 2 detected by the terminal temperature sensor 34 with the set target temperature to determine whether the temperature of the circulating fluid L has reached the target temperature. It judges (S4). In this step S4, when the temperature of the circulating fluid L reaches the target temperature (Yes in S4), the compressor HP2 of the auxiliary power source is stopped (S5), and transition to normal operation control (see FIG. 7) And jump to step S106 (see 7A in FIG. 7) of normal operation control.

  In step S4, when the temperature of the circulating fluid L does not reach the target temperature (No in S4), the control device 6A executes the basic operation B, and after a predetermined start-up time has elapsed (after 3 minutes) ), The temperature increase rate of the temperature of the circulating fluid L every one minute is determined every predetermined elapsed time (every one minute) (S6), and the temperature increase rate is less than 3 degrees in one minute (S6) In S6, the compressor HP2 of the auxiliary power source is increased to the maximum rotation speed (for example, 90 rps) and driven (S7), and the process shifts to normal operation control (see FIG. 7) (S8).

  On the other hand, if the temperature increase rate is 3 degrees or more in one minute in S6 (No in S6), the basic operation C is executed to drive the compressor HP1 of the main power source and the compressor HP2 of the auxiliary power source. Then, it is determined whether or not a predetermined target time (10 minutes) has passed after that (S9), and when the predetermined target time (10 minutes) has passed (Yes in S9), the auxiliary power source is compressed The machine HP2 is driven to increase to the maximum rotation speed (for example, 90 rps) (S10), and shifts to normal operation control (see FIG. 7) (S11).

  In step S9, if the predetermined target time (10 minutes) has not passed (No in S9), the process returns to step S4 to determine whether the temperature of the circulating fluid L has reached the target temperature.

Second Embodiment
The second embodiment is a control operation for executing the basic operations A and C in the start-up operation control. In the second embodiment, since the basic operations A (S1 to S5) are the same, redundant description will be omitted.
The control device 6B according to the second embodiment executes the basic operation C when the temperature of the circulating fluid L has not reached the target temperature in step S4, as shown in FIG. 5 (No in S4). And determines whether a predetermined target time (10 minutes) has passed since the main power source compressor HP1 and the auxiliary power source compressor HP2 were driven (S9), and the predetermined target time (10 minutes) (Yes at S9), drive the compressor HP2 of the auxiliary power source to the maximum rotation speed (for example, 90 rps) and drive it (S10), and shift to normal operation control (see FIG. 7) To do (S11).

  In step S9, if the predetermined target time (10 minutes) has not passed (No in S9), the process returns to step S4 to determine whether the temperature of the circulating fluid L has reached the target temperature.

[Defrosting control]
In the defrosting control operation, the second expansion valve 54 is expanded to a predetermined opening degree than in the heating operation before the defrosting operation, and in this case it is expanded to the full opening, and the four-way valve 58 is switched to the state at the defrosting operation The flow direction of the second refrigerant C2 is opposite to the flow direction of the second refrigerant C2 during heating operation, and the high temperature second refrigerant C2 discharged from the second compressor 53 is transferred to the air heat source heat exchanger 55. The frost is supplied and melted in the air heat source heat exchanger 55. The temperature of the second heat source heat exchanger 55 decreases due to heat exchange with frost, and the second refrigerant C2 that has flowed out of the air heat source heat exchanger 55 is not reduced by the second expansion valve 54 and the second expansion valve 54 is reduced. It passes through, flows through the second heating heat exchanger 51, and returns to the second compressor 53 again. At the time of the defrosting operation, in the second heating heat exchanger 51, heat exchange is performed between the second refrigerant C2 and the circulating fluid L, and the heat of the circulating fluid L is absorbed by the second refrigerant C2 side, and the air heat source It is used as heat for defrosting of the heat exchanger 55.

[Normal operation control]
In the normal operation control (S101), as shown in FIG. 7, in the control device 6, the air heat heat pump device 5 which is the second heat pump circuit is the main power source, and the ground heat heat pump device 4 which is the first heat pump circuit. It is determined whether it is driven as an auxiliary power source (S102). And in Yes, it is judged whether the frequency of defrost operation of air heat pump apparatus 5 is more than predetermined frequency (for example, 5 times or more in 3 hours) (S103), and in the case of Yes, the underground which is the 1st heat pump circuit The thermal heat pump device 4 is used as a main power source, and the air heat heat pump device 5 which is a second heat pump circuit is switched as an auxiliary power source (S104).

  As a result, even when the defrosting operation of the air heat heat pump device 5 is performed frequently, the ground heat heat pump device 4 which does not require the defrosting operation is switched to the main power source and controlled, thereby suppressing a decrease in heating capacity. Good heating can be obtained continuously.

  Next, after the main power source and the auxiliary power source are switched, and in the case of No in the above-described S102 and S103, the process jumps to 7B of FIG. 8 and circulates returning from the heat dissipation terminal 2 detected by the terminal temperature sensor 34. It is determined whether the temperature of the circulating fluid L has reached the target temperature by comparing the temperature of the fluid L with the set target temperature (S105). In step S105, when the temperature of the circulating fluid L reaches the target temperature (Yes in S105), the rotational speed of the compressor HP2 of the auxiliary power source is decreased by one step (S106), and the rotational speed Nrps or lower It is determined whether it becomes (S107).

On the other hand, if the temperature of the circulating fluid L does not reach the target temperature in step S105 (No in S105), it is determined whether the compressor HP2 of the auxiliary power source is driven at 90 rps (S115) When the compressor HP2 of the auxiliary power source is not driven at 90 rps (No in S115), the rotational speed of the compressor HP2 of the auxiliary power source is increased by one step (Step S116), and the process returns to Step S105.
In step S115, when the compressor HP2 of the auxiliary power source is operating at 90 rps (Yes in S115), the process directly returns to step S105.

In step S107, when the rotational speed of the compressor HP2 of the auxiliary power source becomes equal to or lower than the lower limit rotational speed N (Yes in S107), the compressor HP2 of the auxiliary power source is stopped (S108). It is determined whether the temperature of L has reached the target temperature (S109).
On the other hand, when the rotational speed of the compressor HP2 of the auxiliary power source is not less than or equal to the lower limit rotational speed Nrps in step S107 (No in S107), the process returns to step S105.

In step S109, when the temperature of the circulating fluid L reaches the target temperature (Yes in S109), the rotational speed of the compressor HP1 of the main power source is decreased by one step (S110), and the rotational speed Nrps is lower than the lower limit. It is determined whether or not it has reached (S111), and the compressor HP1 of the main power source is stopped (S112) when the rotational speed N becomes lower than the lower limit.
On the other hand, if the temperature of the circulating fluid L does not reach the target temperature in step S109 (No in S109), it is determined whether the compressor HP1 of the main power source is driven at 90 rps (S117) When the compressor HP1 of the main power source is operating at 90 rps (Yes in S117), the compressor HP2 of the auxiliary power source is activated (S118), and the process returns to step S105.
In step S117, when the compressor HP1 of the main power source is not driven at 90 rps (No in S117), the rotational speed of the compressor HP1 of the main power source is increased by one step (S119), and the process returns to step S109.

In step S112, after stopping the compressor HP1 of the main power source, the temperature of the circulating fluid L is monitored to determine whether the temperature of the circulating fluid L is lower than the target temperature (S113). If the temperature of the target temperature is lower than the target temperature (Yes in S113), the compressor HP1 of the main power source is activated (S114), and the process returns to step S109.
If the temperature of the circulating fluid L is not lower than the target temperature (No in S113), the temperature of the circulating fluid L is monitored and step S113 is repeated.

DESCRIPTION OF SYMBOLS 1 combined heat source heat pump apparatus 2 heat radiation terminal 3 heating heat exchange part 4 underground heat heat pump apparatus 5 air heat heat pump apparatus 6, 6A, 6B control apparatus 31 heating circulation circuit 32 heating circulation pump 34 terminal temperature sensor 41 1st heating heat exchanger 42a, 42b Temperature sensor 43 first compressor 44 first expansion valve 45 underground heat source heat exchanger 46 heat medium circulating passage 47 underground heat circulation pump 48 underground heat exchanger 51 second heating heat exchanger 52a, 52b temperature Sensor 53 Second compressor 54 Second expansion valve 55 Air heat source heat exchanger 57 Outside air temperature sensor 61 Ground heat pump control device 62 Air heat heat pump control device C1, C2 Refrigerant H1 Heat medium HP1 Compressor of main power source HP L Auxiliary power source compressor L Circulating fluid

Claims (1)

A heating circulation circuit having a heating circulation pump for circulating the circulating fluid to the heat radiation terminal;
A first heating heat exchanger as a condenser disposed in the heating circuit;
A second heating heat exchanger as a condenser disposed in the heating circulation circuit;
A first heat pump circuit including a first compressor for compressing a refrigerant circulating in the circuit using ground heat as a heat source, and heating the circulating fluid via the first heating heat exchanger;
A second heat pump circuit provided with a second compressor for compressing a refrigerant circulating in the circuit using air heat as a heat source, and heating the circulating fluid via the second heating heat exchanger;
A terminal temperature sensor that measures the temperature of the circulating fluid;
It has an outside air temperature sensor that measures the outside air temperature, and a control device that controls the operation,
The first heating heat exchanger is disposed in series upstream of the second heating heat exchanger in the heating circuit.
In the combined heat source heat pump apparatus performing a heating operation for heating the circulating fluid,
The controller uses the second compressor of the second heat pump circuit as a main power source and the first compressor of the first heat pump circuit as auxiliary power when the outside air temperature is higher than a predetermined reference temperature. Drive as a source, and when the outside air temperature is lower than a predetermined reference temperature, use the first compressor of the first heat pump circuit as a main power source and the second compressor of the second heat pump circuit as auxiliary power When the temperature of the circulating fluid, which is driven as a source and heated, reaches a set target temperature, the compressor rotational speed of the auxiliary power source is decreased prior to the main power source,
The control device drives the second compressor of the second heat pump circuit as a main power source and drives the first compressor of the first heat pump circuit as an auxiliary power source during the heating operation. The frequency of the defrosting operation is detected, and when the detected frequency of the defrosting operation is equal to or more than a predetermined number of times set in advance, the first compressor of the first heat pump circuit is used as a main power source A complex heat source heat pump system characterized in that the second compressor of the second heat pump circuit is switched and controlled as an auxiliary power source.

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