JP6381725B2 - Heat pump equipment - Google Patents

Description

  The present invention relates to a heat pump device that uses a plurality of heat sources.

  Conventionally, in this type of heat pump apparatus, as shown in FIG. 2, a heat pump unit 101 includes a compressor 102, a heating heat exchanger 103 as a condenser, an expansion valve 104, and a heat source heat exchanger 105 as an evaporator. The heat source heat exchanger 105 includes an air heat source heat exchanger 106 that uses air heat as a heat source and a ground heat source heat exchanger 107 that uses underground heat as a heat source. The first heat pump circuit 109 in which the exchanger 103, the expansion valve 104, and the air heat source heat exchanger 106 are connected in a ring shape by the refrigerant pipe 108, the compressor 102, the heating heat exchanger 103, the expansion valve 104, and the underground heat source heat exchanger. A second heat pump circuit 110 is formed in which 107 is annularly connected by a refrigerant pipe 108.

  A switching valve 111 is provided in the refrigerant pipe 108 between the expansion valve 104 and the heat source heat exchanger 105 and switches the flow of the refrigerant. When the underground heat source heat exchanger 107 side is closed by the switching operation of the switching valve 111. If the refrigerant flows to the air heat source heat exchanger 106 side, the first heat pump circuit 109 is formed to extract heat from the outside air, and the air heat source heat exchanger 106 side is closed, the ground heat source heat exchanger 107 side The refrigerant flows and the second heat pump circuit 110 is formed to collect heat from the ground.

  112 is a blower fan that blows air to the air heat source heat exchanger 106, 113 is an underground heat exchanger embedded in the ground, and 114 is underground between the underground heat exchanger 113 and the underground heat source heat exchanger 107. A ground heat circulation circuit connected in a ring shape with a heat pipe 115, a ground heat circulation pump 116 for circulating a heat medium to the ground heat circulation circuit 114, a load terminal 117, and a heat medium 118 for circulating the heat medium to the load terminal 117. A heating circulation circuit to which the heating heat exchanger 103 is connected in the middle, 119 is a heating circulation pump that circulates the heat medium in the heating circulation circuit 118, 120 is an outside air temperature sensor that detects the outside air temperature, and is detected by the outside air temperature sensor 120. When the outside air temperature is high, the switching valve 111 closes the underground heat source heat exchanger 107 side and allows the refrigerant to flow to the air heat source heat exchanger 106 side, and the air heat source heat exchanger 106 is an evaporator and heating heat exchanger 103. As a condenser When the outside air temperature detected by the outside air temperature sensor 120 is low, the switching valve 111 closes the air heat source heat exchanger 106 side and exchanges the ground heat source heat. The refrigerant is caused to flow to the side of the heater 107, the underground heat source heat exchanger 107 functions as an evaporator, and the heating heat exchanger 103 functions as a condenser, and hot water is supplied at the load terminal 117 using underground heat with good heat collection efficiency as a heat source. Some have a boiling operation to heat water (see, for example, Patent Document 1). Further, if a floor heating panel or the like is installed as the load terminal 117, a heating operation to heat the air in the air-conditioned space is performed. It was something that could be done.

JP 2006-125769 A

  By the way, in this conventional heat pump device, when the heating operation is performed, either the air heat source heat exchanger 106 or the underground heat source heat exchanger 107 having good heat collection efficiency is used according to the outside air temperature. However, since only one of the heat source of the air heat source heat exchanger 106 or the underground heat source heat exchanger 107 can be used, the heating output of the load terminal 117 is reduced at low outside air temperature such as in winter. When it becomes larger, there is a problem that a desired heating output cannot be obtained.

In order to solve the above-described problems, the present invention is particularly configured in claim 1 as a first compressor, a first heating heat exchanger as a condenser, a first pressure reducing means, and an evaporator using ground heat. First heat pump circuit in which the underground heat source heat exchanger is annularly connected by a first refrigerant pipe, a second compressor, a second heating heat exchanger as a condenser, a second decompression means, and air heat of outside air as a heat source A heat circulation circuit having a second heat pump circuit in which an air heat source heat exchanger as an evaporator that uses a ring is connected in a ring shape with a second refrigerant pipe, a heat radiating terminal, and a heating circulation pump that circulates a heat medium that radiates heat at the heat radiating terminal A circuit and an outside air temperature sensor for detecting an outside air temperature are provided to perform heating operation by the heat radiating terminal, and the first heating heat exchanger and the second heating heat exchanger are connected in series to the heating circulation circuit. Connected to the outside air temperature sensor. Based on the outside air temperature detected, one of the first heat pump circuit or the second heat pump circuit, select whichever of Tonetsu efficiency, and when the heating output is smaller actuates only the heat pump circuit of a side selected When the desired heating output cannot be obtained by operating only the first heat pump circuit, the heating operation is performed by operating both heat pump circuits.

According to a second aspect of the present invention, the first heating heat exchanger and the second heating heat exchanger are connected to the heating circulation circuit with respect to the flow of the heat medium circulating in the heating circulation circuit. The exchanger and the second heating heat exchanger were connected in series in this order .

According to this invention, the first heating heat exchanger of the first heat pump circuit and the second heating heat exchanger of the second heat pump circuit are connected in series to the heating circulation circuit, and based on the outside air temperature detected by the outside air temperature sensor. Selecting one of the first heat pump circuit or the second heat pump circuit with better heat collection efficiency, and when the heating output is small, performing the heating operation by operating only the selected heat pump circuit, and When the desired heating output cannot be obtained by the operation of only the first heat pump circuit, the heating operation is performed by operating both heat pump circuits. When the heating output is small, the underground heat is used. Heating efficiency as a heat source in heating operation by operating only the first heat pump circuit or heating operation by operating the second heat pump circuit using air heat It is possible to perform good heating operation efficiency by selecting people good, both the in the operation of the first heat pump circuit only may not be obtained the desired heating output, the first heat pump circuit and the second heat pump circuit The desired heating output can be obtained by performing the heating operation by operating the.

The schematic block diagram of one Embodiment of the heat pump apparatus of this invention. The schematic block diagram of the conventional heat pump apparatus.

Next, an embodiment of the heat pump device of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the heat pump device of the present embodiment is roughly composed of a geothermal heat pump unit 1, an air heat heat pump unit 2, a geothermal heat exchange unit 3, and a heating heat exchange unit 4. Is.

  The geothermal heat pump unit 1 circulates a variable capacity first compressor 5 for compressing refrigerant and a high-temperature refrigerant discharged from the first compressor 5, and a heat medium for the high-temperature refrigerant and the heating heat exchange unit 4. A first heating heat exchanger 6 as a first condenser for performing heat exchange with the first expansion valve 7, a first expansion valve 7 as first decompression means for decompressing the refrigerant flowing out of the first heating heat exchanger 6, A ground heat source heat exchanger 8 serving as a first evaporator that performs heat exchange between the low-temperature refrigerant decompressed by the expansion valve 7 and the heat medium on the heat source side of the ground heat exchanging unit 3 is provided. The first heat pump circuit 10 is formed by connecting the pipe 9 in a ring shape. Moreover, as a refrigerant | coolant of the geothermal heat pump unit 1, arbitrary refrigerant | coolants, such as a carbon dioxide refrigerant | coolant and a HFC refrigerant | coolant, can be used.

  The air heat heat pump unit 2 circulates a second compressor 11 having a variable capacity for compressing the refrigerant and a high-temperature refrigerant discharged from the second compressor 11, and the high-temperature refrigerant and the heat medium of the heating heat exchange unit 4. A second heating heat exchanger 12 as a second condenser that performs heat exchange of the second expansion valve 13, a second expansion valve 13 as a second decompression means that decompresses the refrigerant flowing out of the second heating heat exchanger 12, and a second expansion An air heat source heat exchanger 15 serving as a second evaporator that performs heat exchange between the low-temperature refrigerant decompressed by the valve 13 and the air blown from the blower fan 14 is provided and connected in a ring shape by the second refrigerant pipe 16. Thus, the second heat pump circuit 17 is formed. Reference numeral 18 denotes an outside air temperature sensor that detects the outside air temperature.

  The underground heat exchanging section 3 includes an underground heat source heat exchanger 8, an underground heat exchanger 19 installed in the ground, an underground heat source heat exchanger 8, and an underground heat exchanger 19. A ground heat circulation circuit 21 connected in a ring shape with a heat pipe 20 and a ground heat circulation pump 22 with a variable rotation speed for circulating an antifreeze liquid as a heat medium in the ground heat circulation circuit 21 are provided.

  Here, in the underground heat exchanging section 3, the underground heat exchanger 19 collects the underground heat from the ground, and the antifreeze liquid that has the heat is discharged from the underground heat circulation pump 22 to the underground heat source heat exchanger 8. In the ground heat source heat exchanger 8, the refrigerant and the antifreeze flow face each other to exchange heat, and the ground heat collected in the ground heat exchanger 19 is converted into the first heat pump. The refrigerant is pumped up to the refrigerant side of the circuit 10 and heated.

  The heating heat exchanging unit 4 includes a heat radiating terminal 23 such as a floor heating panel or a panel convector that heats the air-conditioned space, and a heating circulation pump 24 that circulates a circulating liquid as a heat medium that radiates heat at the heat radiating terminal 23. And a thermal valve 26 (26a, 26b) that is provided in each heating circulation circuit 25 branched for each heat radiation terminal 23 and controls the supply of the circulating fluid to the heat radiation terminal 23 by opening and closing thereof. The first heating heat exchanger 6 as the first condenser and the second heating heat exchanger 12 as the second condenser are connected in series to the heating circulation circuit 25 and circulates through the heating circulation circuit 25. The heating medium is configured to heat, and the heating medium circulating in the heating circuit 25 circulates through the first heating heat exchanger 6 and then circulates through the second heating heat exchanger 12 and supplies it to the heat radiating terminal 23. It is what is done.

  27 receives the input of each temperature sensor and a signal from a remote controller (not shown) to drive each actuator of the first compressor 5, the first expansion valve 7, the underground heat circulation pump 22, and the heating circulation pump 24. A geothermal heat pump control means 28 having a microcomputer to be controlled is connected to the geothermal heat pump control means 27 so as to be communicable, and receives a signal from each temperature sensor or a signal from a remote controller (not shown), and performs a second compression. Air heat heat pump control means having a microcomputer for controlling the drive of the actuators of the machine 11, the second expansion valve 13, and the blower fan 14.

Next, operation | movement of the heat pump apparatus of one Embodiment is demonstrated.
A remote control (not shown) is installed in each air-conditioned space heated by the heat radiating terminal 23. When the remote controller instructs heating of the air-conditioned space, the underground heat pump control means 27 is provided. The air heat heat pump control means 28 operates the first heat pump circuit 10 of the underground heat pump unit 1 that uses the underground heat based on the outside air temperature detected by the outside air temperature sensor 18 or the air heat that uses the air heat. It is determined whether or not the second heat pump circuit 17 of the heat pump unit 2 is to be operated, and the heat source having the better heat collection efficiency is selected. The heating output of the heat radiating terminal 23 is not so low as in the spring or autumn. Is small, the air heat heat pump unit 2 is selected, and the air heat heat pump control means 28 is connected to the second compressor 11 and the second compressor. The driving of the tension valve 13 and the blower fan 14 is started to operate the second heat pump circuit 17 using the air heat, and the underground heat pump control means 27 starts to drive the heating circulation pump 24, and the heat radiating terminal 23 Heating operation is started.

  During the heating operation in which only the second heat pump circuit 17 is operated, the low-temperature refrigerant decompressed by the second expansion valve 13 and the air blown from the blower fan 14 in the air heat source heat exchanger 15 that is an evaporator. Heat exchange is performed, the heat of the air is pumped up to the refrigerant side of the second heat pump circuit 17, and the high-temperature refrigerant discharged from the second compressor 11 and the heating circulation circuit in the second heating heat exchanger 12 that is a condenser The heat medium circulating through the heat circulating circuit 25 is opposed to the heat medium to exchange heat, the heat medium circulating through the heating circuit 25 is heated, and the heated heat medium is sent to the heat radiating terminal 23 through the heat valve 26. The air-conditioned space instructed by the remote controller is heated. In addition, during the heating operation in which only the second heat pump circuit 17 is operated, the heat medium circulating in the heating circulation circuit 25 also passes through the first heating heat exchanger 6. Since the first heat pump circuit 10 of the underground heat pump unit 1 that uses the heat does not operate, the first heating heat exchanger 6 passes through without being heated and is circulated to the second heating heat exchanger 12. It is.

  On the other hand, when the temperature of the air-conditioned space is instructed by the remote controller when the outside air temperature is low, such as in winter, the underground heat pump control means 27 and the air heat pump control means 28 detect the outside air temperature sensor 18. A geothermal heat pump unit 1 that uses geothermal heat with good heat collection efficiency as a heat source is selected based on the outside air temperature, and the geothermal heat pump control means 27 includes the first compressor 5, the first expansion valve 7, and the underground. The driving of the heat circulation pump 22 is started, the first heat pump circuit 10 that uses the underground heat is activated, the driving of the heating circulation pump 24 is started, and the heating operation by the heat radiating terminal 23 is started.

  During the heating operation with only the first heat pump circuit 10 activated, the underground heat exchanger 3 exchanges heat with the underground by the underground heat exchanger 19 to collect the underground heat and take the heat. The antifreeze is supplied to the underground heat source heat exchanger 8 by the underground heat circulation pump 22. Then, in the underground heat source heat exchanger 8 which is an evaporator, the low-temperature refrigerant decompressed by the first expansion valve 7 and the antifreezing liquid circulating in the underground heat circulation circuit 21 face each other to exchange heat. The underground heat collected by the underground heat exchanger 19 is pumped to the refrigerant side of the first heat pump circuit 10 and discharged from the first compressor 5 by the first heating heat exchanger 6 that is a condenser. The high temperature refrigerant and the heat medium circulating in the heating circuit 25 flow oppositely to exchange heat, the heat medium circulating in the heating circuit 25 is heated, and the heated heat medium is heated by the thermal valve 26. Is sent to the heat radiating terminal 23 and heats the air-conditioned space designated by the remote controller. In addition, during the heating operation in which only the first heat pump circuit 10 is operated, the heat medium circulating in the heating circulation circuit 25 also passes through the second heating heat exchanger 12, but at this time, the air heat is Since the second heat pump circuit 17 of the air heat heat pump unit 2 to be used does not operate, the heat medium heated by the first heating heat exchanger 6 is not heated by the second heating heat exchanger 12. To pass.

  Further, as described above, in the heating operation in which the first heat pump circuit 10 that uses the underground heat having good heat collection efficiency as the heat source is operated when the outside air temperature is low, the heating output of the heat radiation terminal 23 is small. In this case, only the first heat pump circuit 10 is operated to obtain a desired heating output. However, the heating output by the heat radiating terminal 23 is increased due to a further decrease in the outside air temperature, and the first heat pump circuit 10. When the desired heating output cannot be obtained by only the operation, the air heat heat pump control means 28 starts driving the second compressor 11, the second expansion valve 13, and the blower fan 14 and uses the air heat. The heating operation is performed by operating the second heat pump circuit 17 and operating both the first heat pump circuit 10 and the second heat pump circuit 17.

  At the time of heating operation in which both the first heat pump circuit 10 and the second heat pump circuit 17 are operated, in the first heat pump circuit 10, the ground heat source heat exchanger 8 that is an evaporator is used by the first expansion valve 7. The decompressed low-temperature refrigerant and the antifreezing liquid circulating in the underground heat circulation circuit 21 face each other to exchange heat, and the underground heat collected by the underground heat exchanger 19 is converted into the first heat pump circuit. In the first heating heat exchanger 6 that is pumped up to the refrigerant side 10 and is a condenser, the high-temperature refrigerant discharged from the first compressor 5 and the heat medium circulating in the heating circulation circuit 25 flow oppositely to generate heat. The heat medium circulating through the heating circuit 25 is heated and the low-temperature refrigerant decompressed by the second expansion valve 13 in the air heat source heat exchanger 15 as an evaporator in the second heat pump circuit 17. And blower fan The heat exchange with the air blown from 4 is performed, and the heat of the air is pumped up to the refrigerant side of the second heat pump circuit 17 and discharged from the second compressor 11 by the second heating heat exchanger 12 which is a condenser. The high temperature refrigerant and the heat medium circulating in the heating circuit 25 flow oppositely to exchange heat, the heat medium circulating in the heating circuit 25 is heated, and the heat medium circulating in the heating circuit 25 is After being heated by the first heating heat exchanger 6, the second heating heat exchanger 12 is also heated and sent to the heat radiating terminal 23 through the thermal valve 26 to heat the air-conditioned space designated by the remote controller. Is.

  Thus, when the heating output is small by connecting the first heating heat exchanger 6 of the first heat pump circuit 10 and the second heating heat exchanger 12 of the second heat pump circuit 17 in series to the heating circulation circuit 25. The second heat pump circuit of the air heat heat pump unit 2 that uses the heating operation or the air heat that operates only the first heat pump circuit 10 of the geothermal heat pump unit 1 that uses the geothermal heat based on the outside air temperature. Among the heating operations with the 17 operated, it is possible to select the one having the best heat collection efficiency as the heat source to perform the efficient heating operation, and when the heating output is large, the first heat pump circuit 10 and the second heat pump circuit 10 It is possible to obtain a desired heating output by performing the heating operation by operating both of the heat pump circuits 17.

  Note that the present invention is not limited to the above-described embodiment, and in the present embodiment, two heat pump units of the geothermal heat pump unit 1 and the air heat heat pump unit 2 are provided. One heat pump unit may be provided, and the first heat pump circuit 10, the second heat pump circuit 17, the underground heat circulation pump 22, and the heating circulation pump 24 may be provided in the heat pump unit, and further, the underground heat pump control The two control means of means 27 and air heat heat pump control means 28 are also one heat pump control means, and receive the input of each temperature sensor and the signal from the remote controller, and the first compressor 5, the first expansion valve 7, the first 2 Actuators of the compressor 11, the second expansion valve 13, the blower fan 14, the underground heat circulation pump 22, and the heating circulation pump 24 In which it may be controlled to drive.

  In the present embodiment, the first heating heat exchanger 6 and the second heating heat exchanger 12 are connected to the heating circulation circuit 25 with respect to the flow of the heat medium circulating in the heating circulation circuit 25. 6. The second heating heat exchanger 12 is connected in series in this order, but the first heating heat exchanger 6 and the second heating heat exchanger 12 are connected to the flow of the heat medium circulating in the heating circulation circuit 25. The second heating heat exchanger 12 and the first heating heat exchanger 6 may be connected in series to the heating circulation circuit 25 in this order.

  Moreover, in this embodiment, although only one underground heat exchanger 19 is installed in the ground, a plurality of underground heat exchangers 19 may be installed in the ground. The exchangers 19 may be connected in parallel to each other, or may be connected in series.

  In the present embodiment, the underground heat exchanger 19 is installed in the ground, and the underground heat exchanger 19 is directly buried in the ground to collect the underground heat. What installs 19 in a well and collects heat from well water warmed by underground heat is also included in what installs underground heat exchanger 19 in the ground.

DESCRIPTION OF SYMBOLS 5 1st compressor 6 1st heating heat exchanger 7 1st expansion valve 8 Ground source heat exchanger 9 1st refrigerant | coolant piping 10 1st heat pump circuit 11 2nd compressor 12 2nd heating heat exchanger 13 2nd expansion Valve 15 Air source heat exchanger 16 Second refrigerant pipe 17 Second heat pump circuit 23 Heat radiation terminal 24 Heating circulation pump 25 Heating circulation circuit

Claims (2)

1st heat pump which connected the 1st compressor, the 1st heating heat exchanger as a condenser, the 1st decompression means, and the underground heat source heat exchanger as an evaporator using underground heat by the 1st refrigerant piping annularly A circuit, a second compressor, a second heating heat exchanger as a condenser, a second decompression means, and an air heat source heat exchanger as an evaporator that uses the air heat of outside air as a heat source are annularly formed by a second refrigerant pipe A second heat pump circuit connected; a heat radiating terminal; a heating circulation circuit having a heating circulation pump that circulates a heat medium that radiates heat from the heat radiating terminal; and an outside air temperature sensor that detects an outside air temperature. The first heating heat exchanger and the second heating heat exchanger are connected in series to the heating circulation circuit, and the first heating heat exchanger and the second heating heat exchanger are connected to the heating circulation circuit based on the outside air temperature detected by the outside air temperature sensor. 1 heat pump circuit or front Of the second heat pump circuit, select whichever of Tonetsu efficiency, along with if the heating output is small performs the heating operation by operating only the heat pump circuit of the person who is selected, the operation of only the first heat pump circuit Then, when the desired heating output cannot be obtained, the heating operation is performed by operating both heat pump circuits. In the heating circuit, the first heating heat exchanger, the second heating heat exchanger, the first heating heat exchanger, the second heating with respect to the flow of the heat medium circulating in the heating circuit. 2. The heat pump device according to claim 1 , wherein the heat pump devices are connected in series in the order of heat exchangers.

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