JPH07301473A - Heat pump apparatus - Google Patents

Abstract

PURPOSE:To avoid the instabilization of an operation and a decrease in efficiency in a heat pump apparatus in which the ice melting operation of a heat absorber is executed by operating the absorber as the function of a condenser. CONSTITUTION:The heat pump apparatus comprises a heat absorber R for absorbing heat from an external heat absorption source OA, a heater for heating an object to be heated, detecting means for detecting the iced state of the absorber R, and a series circuit group provided as a heat pump structure having a plurality of heat pump circuits Sa, Sb interposed thermally in series between a heat absorbing evaporator E and a radiating condenser, wherein the absorber R is operated as the function of the evaporator E based on detection information of the detecting means. The apparatus further comprises switching control means for switching a normal heat absorbing operation for operating the heater as the function of the condenser to an ice melting operation for heating the absorber R as the function of the condenser, wherein the control means operates the absorber R in the ice melting operation as the function of the condenser of a predetermined heat pump circuit disposed at an intermediate or low temperature end of the group.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided with a heat absorber that absorbs heat from an external heat source, a heater that heats an object to be heated, and a detection means that detects a frozen state of the heat absorber. A series circuit group in which a plurality of heat pump circuits are thermally interposed in series is provided between the evaporator for heat dissipation and the condenser for heat dissipation, and the heat absorber is connected to the heat absorber based on the detection information of the detection means. And a heat pump device provided with switching control means for switching the operating state from a normal endothermic operation in which the heater functions as the heat-dissipating condenser to an thawing operation in which the heat absorber functions as a condenser to heat the ice. Regarding

[0002]

2. Description of the Related Art Generally, in a heat pump circuit, frost or ice adheres to the periphery of the heat absorber because the vaporizer for heat absorption during heating operation evaporates at a temperature lower than the temperature of outside air or water to be absorbed. In order to remove such frost and ice that interferes with normal operation, the refrigerant supply destination from the compressor is changed from a heater to a heat absorber, causing the heat absorber to function as a condenser and generate heat. The hot-gas method is used to perform the ice-melting operation.

In the multistage heat pump device having the series heat pump circuit group described above, it is necessary to similarly perform the deicing operation. When performing the defrosting operation by the hot gas method, the switching control means is It has been considered to supply the high temperature side refrigerant to the heat absorber so that the heat absorber functions as a condenser. Explaining the configuration with reference to the drawings, as shown in FIG. 9 and FIG. 10, a pair of air supply SA1 ′, SA2 ′ to a pair of chambers to be heated is caused to function as a heat radiation condenser during heating operation. Heater H
High temperature side heat pump circuit Sa 'equipped with 1'and H2'
And a low-temperature side heat pump circuit Sb ′ having a heat absorber R ′ that also functions as a heat-absorption evaporator during heat-up operation and absorbs heat from the outside air, and a low-temperature-side heater that functions as a heat-radiating condenser during heat-up operation, respectively. Xc 'and a high temperature side heat absorber Xe' which functions as an endothermic evaporator are integrally configured to exchange heat between the two heat pump circuits Sa 'and Sb'. is there. The thick black line indicates that the refrigerant state of the part is a high-pressure vapor phase, the thick line with a thin hatching indicates that the refrigerant state of the part is a liquid phase, the point is hatched. The thick line indicates that the refrigerant state of the part is low-pressure gas-liquid two-phase, and the white thick line indicates that the refrigerant state of the part is low-pressure gas phase. Also,
exp1 'to exp4' are expansion valves.

FIG. 9 shows the heating operation. In the high temperature side heat pump circuit Sa ', the high pressure gas phase refrigerant Ahg' from the high temperature side compressor Cpa 'is supplied to the pair of heaters H1' and H2 'for heat radiation. The liquid-phase refrigerant Aw ′ after being condensed from the heaters H1 ′ and H2 ′ is caused to function as a condenser to generate heat.
Is decompressed and expanded into a low-pressure gas-liquid two-phase state and supplied to the high temperature side heat absorber Xe 'of the heat exchange means X', while in the low temperature side heat pump circuit Sb ', the high pressure gas phase refrigerant from the low temperature side compressor Cpb' is supplied. Bhg ′ is supplied to the low temperature side heater Xc ′ of the heat exchange means X ′ to generate heat, and the low temperature side heater X
The liquid-phase refrigerant Bw ′ from c ′ is decompressed and expanded into a low-pressure gas-liquid two-phase state and supplied to the heat absorber R ′ to function as an endothermic evaporator to absorb heat, and then the low-pressure gas-phase refrigerant B ′ is cooled to a low temperature. Return to the side compressor Cpb '. Further, FIG. 10 shows the operation of thawing, switching the configuration of the refrigerant circulation path to supply the high-pressure gas-phase refrigerant Ahg ′ from the high temperature side compressor Cpa ′ to the heat absorber R ′ and the heat absorber. R'functions as a heat dissipation condenser. Then, heat is generated from this heat absorber R ',
The frost and ice attached to the heat absorber R'can be removed.

[0005]

However, when the deicing operation is performed using the high temperature side refrigerant as described above, the following problems may occur. In other words, when the heat absorber functions as a condenser, the high temperature side refrigerant is used, so the refrigerant condensation temperature becomes higher than necessary compared to the temperature of the heat sink in the frozen state, and as a result, the high temperature side compressor is This means that the vehicle will be operated under conditions that deviate from the proper operating conditions, resulting in unstable operation and reduced efficiency.

In view of the above situation, it is an object of the present invention to provide a heat pump device which can realize a structure for ice-melting operation in a state where unstable operation and reduction in operation efficiency are less likely to occur. .

[0007]

A first characteristic configuration of a heat pump device according to the present invention is a heat absorber that absorbs heat from an external heat source, a heater that heats an object to be heated, and a frozen state of the heat absorber. A detection means is provided, and as a heat pump configuration, a series circuit group in which a plurality of heat pump circuits are thermally interposed in series between the heat absorption evaporator and the heat dissipation condenser is provided, and based on the detection information of the detection means. Then, from the normal endothermic operation in which the heat absorber functions as the heat-absorbing evaporator and the heater functions as the heat-dissipating condenser, the operation proceeds to the deicing operation in which the heat-absorber functions as a condenser and is heated. A switching control means for switching the state is provided, and the switching control means functions as a condenser of a predetermined heat pump circuit located at an intermediate or low temperature end of the series circuit group in the defrosting operation. Lies in the fact that a configuration that.

A second characteristic configuration of the heat pump device according to the present invention is the same as the first characteristic configuration, in which a plurality of the heat absorbers are provided, and the switching control means has the above-mentioned solution for a part of the heat absorbers. In performing the ice operation, another heat absorber functions as the heat absorbing evaporator, and the heater functions as the heat radiating condenser to continue the normal heat absorbing operation.

[0009]

In other words, the above-described configuration for performing the deicing operation using the refrigerant of the heat pump circuit at the high temperature end is such that, in the case of the defrosting operation of a single heat pump circuit, the supply destination of the refrigerant is from the heater. This is simply a follow-up to switching to a heat absorber, and by connecting multiple heat pump circuits thermally in series, it is possible to heat at a temperature that is considerably higher than the temperature of the heat sink. In the heat pump circuit group having a multi-stage configuration described above, it was found that the heat pump circuit of the present invention can be sufficiently utilized for defrosting even if it is not as high a heat source as the refrigerant of the heat pump circuit at the high temperature end. In the first characteristic configuration of No. 1, the heat absorber functions as a condenser of a predetermined heat pump circuit located at an intermediate or low temperature end in the series group of heat pump circuits in the thawing operation. With this configuration, it is possible to ensure that the refrigerant condensation temperature is higher than necessary when compared with the temperature of the heat sink in the ice-free state, while sufficiently achieving the heat generation function required for the ice-breaking during the ice-breaking operation. To avoid.

According to the second characteristic configuration of the present invention,
In addition to that, when multiple heat absorbers are provided, some of them function as heat-evaporating evaporators and the heater functions as heat-dissipating condensers when performing ice-melting operation. Since the configuration is such that the operation is continued, it is possible to continue heating the object to be heated by continuously absorbing heat from the external heat absorbing source even during the thawing operation.

[0011]

According to the first feature of the present invention, therefore, the deicing operation can be performed stably and in a state where the efficiency is less reduced, while maintaining the necessary and sufficient deicing function. It has become possible to provide an excellent heat pump device that can realize efficient and efficient heating operation.

According to the second characteristic configuration of the present invention,
In addition to the above-mentioned stable and efficient deicing operation, it is possible to perform de-icing operation on a part of the multiple heat absorbers and continue normal endothermic operation on the rest, so in situations where de-icing is required Even if there is, heating can be performed without interruption, and at the same time, it is possible to provide a heat pump device capable of more efficient heating operation.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 show a heat absorber R that absorbs heat from an external heat source.
The air-conditioner which is an example of the heat pump device which provided with the heater H which heats a heating target is shown. 1 and 4
2 shows the structure of the compressor unit U, FIG. 2 and FIG. 5 show the structure of the pair of indoor unit units I1 and I2, and FIG.
6 and 6 show the configuration inside the pair of outdoor unit units O1 and O2, respectively. The compressor unit U and the both indoor unit units I1 and I2 and the both outdoor unit units O1 and O2 are connected by six spanning pipes p1 to p6. 1 to 3 show a normal heat absorption operation state in which heating is performed using a pair of indoor unit units I1 and I2, and FIGS. 4 to 6 show a frozen state of the heat absorber R in the pair of outdoor unit units O1 and O2. It shows an ice-breaking operation state performed based on the detection.

As shown in FIGS. 2 and 5, the first indoor unit I1 has a heater H acting as a heat-radiating condenser C for heating the air to the first air-conditioning target area which is a heating target.
The first heater 1 and the first air supply fan 3 for supplying the temperature-controlled air from the first heater 1 as the air supply SA1 to the first air conditioning target area are provided. Reference numeral 2 is a reheater for causing the first heater 1 to function as an evaporator during cooling operation to heat the air that has been cooled and dehumidified. In addition, the second indoor unit I2 includes a second heater 4 that is a heater H that acts as a heat dissipation condenser C that heats air to a second air conditioning target area that is also a heating target, and a second heater 4 thereof. A second air supply fan 6 is provided for supplying the temperature-controlled air from the second heater 4 to the second air conditioning target area as the air supply SA2. Reference numeral 5 is a reheater for causing the second heater 4 to function as an evaporator during cooling operation to heat the air dehumidified by cooling. On the other hand, as shown in FIGS. 3 and 6, in the first outdoor unit O1 and the second outdoor unit O2, a heat absorber R that acts as an endothermic evaporator E that absorbs heat from the atmosphere OA that is an external heat absorption source is provided. A certain first and second heat absorbers 7, 8 and the corresponding heat absorbers 7, 8 are exposed to the atmosphere O
Separate air fans 9 and 10 for ventilating A are provided. Further, as shown in FIGS. 1 and 4, the compressor unit U is provided with a condenser path Xc functioning as a refrigerant condenser and an evaporator path Xe functioning as a refrigerant evaporator, which are configured to be capable of mutual heat exchange. The relay heat exchanger X and a pair of compressors Cpa and Cpb are provided.

Then, the high boiling point refrigerant A is circulated in the both heaters 1 and 4 of the indoor unit units I1 and I2 and the evaporator path Xe of the relay heat exchanger X by the high temperature side compressor Cpa, and one outdoor unit unit A second heat absorber 8 of O2, and
The low boiling point refrigerant B is circulated in the condenser path Xc of the relay heat exchanger X by the low temperature side compressor Cpb, and thus two heat pump circuits are provided between the heat absorbing evaporator E and the heat radiating condenser C for radiating heat. Sa and Sb are thermally intervened in series, and the atmosphere O
A heat pump device for heating and controlling the supply air SA1, SA2 with A as an external heat absorbing source is configured. The first heat absorber 7 of the other outdoor unit O1 includes the indoor unit I
The high boiling point refrigerant A returned from both the heaters 1 and 4 of I and I2 is branched and made to flow, and after evaporating and absorbing heat, the high boiling point refrigerant A after passing through the evaporation path Xe of the relay heat exchanger X. It is designed to join.

This is a pair of outdoor unit units O1 and O2.
Since the endothermic capacity of each of the heat absorbers 7 and 8 will be significantly reduced if they become icy at the same time, in order to avoid such a situation, it is possible to make the boiling points of the refrigerants flowing during the normal endothermic operation different from each other. The constant load operating capacities per unit heat transfer area of both heat absorbers 7 and 8 are made different so that the icing times do not overlap with each other. That is, the second heat absorber 8 having the increased capacity, that is, the low boiling point refrigerant B having a large difference from the outside air temperature in this embodiment, is sure to be frozen first. In order to realize the difference in capacity, the high boiling point refrigerant A is made to flow through the one first heat absorber 7, and the low boiling point refrigerant B is made to flow through the other second heat absorber 8.

The low temperature side heat pump circuit Sb also has an expansion valve exp1 having a flow rate adjusting function for the low boiling point refrigerant Bw in the liquid phase from the condenser path Xc of the relay heat exchanger X.
And an expansion valve exp2 for decompressing and expanding the low-boiling-point refrigerant Bw in the liquid phase after passing through the expansion valve exp1 and supplying the low-boiling-point refrigerant Bwg in the low-pressure gas-liquid two-phase state to the second heat absorber 8. It is installed. In the high temperature side heat pump circuit Sa, the high boiling point refrigerant A in the liquid phase from the pair of heaters 1 and 4 is supplied.
Expansion valve exp3 that also has a flow rate control function for w
Exp4 and the high-boiling-point refrigerant Aw in the liquid phase, which has merged after passing through the expansion valves exp3 and exp4, are decompressed and expanded, and the evaporator path Xe and the first heat absorber 7 of the relay heat exchanger X are expanded.
In addition, expansion valves exp5 and exp6 are separately provided for supplying a low-boiling-point high-boiling-point refrigerant Awg in a gas-liquid two-phase state. Note that v1 to v27 are switching valves, exp7 and exp8, which switch the configuration of the refrigerant circulation path according to the operation mode and the like.
Is a switching valve that switches the expansion valve used during the cooling operation. In FIGS. 1 to 6, the black thick line indicates that the refrigerant state of the portion is a high-pressure vapor phase, and the thick hatched thick line indicates that the refrigerant state of the portion is a liquid phase, The thick line with dot hatching indicates that the refrigerant state of that portion is low-pressure gas-liquid two-phase, and the thick white line indicates that the refrigerant state of that portion is low-pressure vapor phase. Further, in the expansion valves exp1 to exp8 and the switching valves v1 to v27, the white ones show the flowing state of the refrigerant, and the black ones show the non-flowing state or the closed state.

Next, the normal suction operation state during heating of the above-mentioned air conditioner will be described with reference to FIGS. In the high temperature side heat pump circuit Sa, the high temperature side compressor Cpa sucks in, compresses and discharges the high boiling point refrigerant A in a low pressure gas phase state. The high-boiling-point high-boiling-point refrigerant Ahg from the high-temperature side compressor Cpa is passed through the pipes p1 to the heaters 1 and 4 of the indoor unit I1 and I2 to supply air to the air conditioning target area SA1. , SA2 are heat-dissipated and condensed. The high-boiling-point refrigerant Aw in the liquid phase state after condensation reaches the expansion valves exp5 and exp6 by being shunted through the pipe p5, and the high-boiling-point refrigerant Awg in the gas-liquid two-phase state that has been decompressed and expanded is transferred to the relay heat exchanger X. The low-boiling-point refrigerant Bhg in a high-pressure vapor state and the atmospheric air OA, which flow through the evaporator path Xe and the first heat absorber 7 of the first outdoor unit O1, and flow through the condenser path Xc.
Are vaporized using the respective heat absorption sources. After that, the high-boiling-point refrigerant A in the low-pressure gas phase from the evaporator path Xe of the relay exchanger X and from the first heat absorber 7 via the pipe p3 is merged, and then the high-temperature side compressor again. Reflux to Cpa and the above cycle is repeated. On the other hand, in the low temperature side heat pump circuit Sb, the low temperature side compressor Cpb is
The low-boiling-point refrigerant B in the low-pressure gas phase is sucked, compressed, and discharged. The high-boiling-point low-boiling-point refrigerant Bhg from the low-temperature side compressor Cpb is passed through the condenser path Xc of the relay heat exchanger x and the vapor-liquid two-phase high-boiling point refrigerant passed through the evaporator path Xe. Awg is condensed as a heat dissipation target. The low-boiling-point refrigerant Bw that has become in the liquid phase state after being condensed from the condenser path Xc of the relay heat exchanger X passes through the expansion pipe ex6 via the expansion pipe ex6.
The low-boiling-point refrigerant Bwg in a gas-liquid two-phase state that has reached p2 and has been expanded under reduced pressure is passed through the second heat absorber 8 of the second outdoor unit O2, and evaporated using the atmosphere OA as a heat absorption source. After that, the low-boiling-point refrigerant B in the low-pressure gas phase is recirculated to the low-temperature side compressor Cpb again through the crossing pipe p4, and the above cycle is repeated.

Now, when it is detected by the detecting means D attached to the heat absorbers 7 and 8 that one of the heat absorbers 7 or 8 is in an icing state while continuing the normal heat absorption operation during heating as described above, Switching control means CC, from the above-mentioned steady endothermic operation,
The operation state is switched to the ice-breaking operation in which the heat absorber 7 or 8 in the frozen state is caused to function as a condenser and is heated. As described above, the outdoor unit units O1 and O2
Since there is a difference in the constant load operating capacity per unit heat transfer area between the different heat absorbers 7 and 8,
The icing times of 8 do not overlap, and only one of them will be in an icing state, and the thawing operation will start accordingly. Next, the thawing operation state will be described with reference to FIGS. 4 to 6 by taking the thawing operation for the second heat absorber 8 as an example.

In the thawing operation, the low temperature side heat pump circuit S
In b, the low temperature side compressor Cpb sucks in, compresses and discharges the low boiling point refrigerant B in a low pressure gas state. The low boiling point refrigerant Bhg in the high pressure gas phase from the low temperature side compressor Cpb
Is branched and a part of the condenser path Xc of the relay heat exchanger X is
The high-boiling-point refrigerant Awg in the gas-liquid two-phase state, which is passed through the evaporator passage Xe and is condensed as a heat radiation target, and the rest is the second of the second outdoor unit O2 through the crossover pipe p2. By flowing the heat absorber 8 and causing the heat absorber 8 to function as a condenser, frost or ice attached to the second heat absorber B is condensed as a heat radiation target. As a result, deicing is performed. The low-boiling-point refrigerant B in a liquid state after condensation from the condenser path Xc of the relay heat exchanger X via the pipe p6 and from the heat absorber 8 of the second outdoor unit O2.
w is merged and reaches the expansion valve exp6, and the low-boiling-point refrigerant Bwg in a gas-liquid two-phase state that has been decompressed and expanded is passed through the first heat absorber 7 of the first outdoor unit O1, and the outside air OA is used as a heat absorption source. Is evaporated. That is, as described above, the normal endothermic operation can be continuously performed in the first outdoor unit O1 even while the second outdoor unit O2 is being defrosted. After the evaporation, the low-boiling-point refrigerant B in a low-pressure vapor phase state is again passed through the piping p4 to the low-temperature side compressor Cp.
Reflux to b and the above cycle is repeated. On the other hand, in the high temperature side heat pump circuit Sa, the high temperature side compressor Cpa draws in, compresses and discharges the high boiling point refrigerant A in the low pressure gas phase state. The high-boiling-point high-boiling-point refrigerant Ahg from the high-temperature side compressor Cpa is passed through the pipes p1 to the heaters 1 and 4 of the indoor unit I1 and I2 to supply air to the air conditioning target area SA1. , SA2 are heat-dissipated and condensed. The high-boiling-point refrigerant Aw that has become a liquid state after condensation is
The high-boiling-point refrigerant Awg in the gas-liquid two-phase state that has reached the expansion valve exp5 via the crossover pipe p5 and has been decompressed and expanded is passed through the evaporator path Xe of the relay heat exchanger X and through the condenser path Xc. The low-boiling-point refrigerant Bhg in the high-pressure gas phase is evaporated using the heat absorption source. Then, the high-boiling-point refrigerant A in the low-pressure gas state is recirculated to the high temperature side compressor Cpa again, and the above-described cycle is repeated. In this way, the heated air supply S to the air-conditioning target area is performed even during the deicing operation.
The feeding of A1 and SA2 can be continuously performed.

Then, as described above, in performing the thawing operation, in order to heat the heat absorber R in the icing state by causing it to function as a condenser, the heat absorber R is connected to the heat pump circuits Sa and Sb. Since it is configured to function as the condenser of the low temperature side heat pump circuit Sb of the series circuit group, when the ice is thawed by heating, the difference between the temperature of the heat absorber in the frozen state and the refrigerant condensation temperature does not become so large. It is possible to prevent the instability of driving and the reduction of efficiency.

Next, the control for switching the operating state from the above-mentioned normal endothermic operation to the deicing operation will be summarized.
As shown in FIGS. 7 and 8, the pair of outdoor unit O
At the refrigerant outlets of O1 and O2, separate ice sensors S1 each including a temperature sensor as a detection means D for detecting the ice state of the first and second heat absorbers 7 and 8 functioning as heat absorbers R1, respectively. S2 is provided, and these ice sensors S1,
The detection signal from S2 is input to the switching control means CC. From the switching control means CC, in order to control the switching of the structure of the refrigerant circulation path in accordance with the above detection signal,
Switching valves v17 to v21 for both outdoor unit units O1 and O2,
It is configured to output a control signal to v23 to v27.

When the second freezing sensor S2 detects that the second heat absorber 8 of the second outdoor unit O2 is in the frozen state, the switching control means CC switches the switching valves to switch the second heat absorber 8 to the freezing state. The defrosting operation for the second outdoor unit, which heats by making the condenser function, is performed. This is the ice-breaking operation state described above. This state is shown in FIG. At this time, as described above, the low boiling point refrigerant B is circulated in the first heat absorber 7 to continuously absorb heat.

When the second outdoor unit deicing operation is completed, the high boiling point refrigerant A is circulated in the second heat absorber 8 and the low boiling point refrigerant B is continuously circulated in the first heat absorber 7. In this state,
Next, the first heat absorber 7 comes into a frozen state first. When the first freezing sensor S1 detects that the first heat absorber 7 is in an icing state, the switching control unit CC switches each switching valve to make the first heat absorber 7 function as a condenser and heat the first heat absorber 7. Defrost operation for outdoor units. This state is shown in FIG. Then, at this time, the low boiling point refrigerant B is circulated in the second heat absorber 8 to continuously absorb heat.

The switching control means CC, as described above,
In response to the detection signal from any one of the ice sensors S1 and S2, the operation state is switched so that the first outdoor unit thaw operation or the second outdoor unit thaw operation is performed, and the remaining operation is performed during the thaw operation. The heat absorber R is used to continuously absorb heat.

[Other Embodiments] Next, still another embodiment of the present invention will be described. <1> In the above embodiment, the low temperature side heat pump circuit Sb and the high temperature heat pump are provided between the heat absorber R that functions as the heat absorbing evaporator E during the normal heat absorbing operation and the heater H that functions as the heat radiating condenser C. Although two heat pump circuits including the circuit Sa are thermally interposed in series, three or more heat pump circuits may be thermally interposed in series instead. Then, in that case, the heat absorber R that functions as a condenser and heats in the deicing operation may be configured to function as a condenser of a heat pump circuit located at an intermediate or low temperature end. Further, the refrigerant to be used may be a mixture of different types having different boiling points, or, as in the previous embodiment, when a plurality of heat pump circuits are independent in a multi-stage compression type, the boiling point is Different types may be used, or a single refrigerant may be used with different boiling points depending on the pressure conditions of each heat pump circuit.

<2> In carrying out the present invention, instead of providing a plurality of heat absorbers R as in the previous embodiment,
Only one heat absorber R may be provided on the assumption that the heating based on the heat absorption is not performed during the thawing operation. Further, even when a plurality of heat absorbers R are provided, the plurality of heat absorbers R may be configured to perform the ice-melting operation at the same time depending on the use environment and the like.

<3> The detecting means D for detecting the frozen state of the heat absorber R is replaced with the temperature sensor for detecting the refrigerant outlet temperature described in the previous embodiment, and the frozen state is observed by observing the change of the refrigerant outlet pressure. A pressure sensor to judge whether or not,
Alternatively, it may be implemented by providing an optical sensor that detects that the reflectance changes due to frost or ice.

<4> The heater H for heating is not limited to the one in which the supply air SA1, SA2 is ventilated by the supply air fans 3, 6 and is fed to the first and second air-conditioning target areas by the duct type. Alternatively, the air conditioning target air may be provided in the air conditioning target area to directly heat the air conditioning target air.

<5> The heat absorption source outside the circuit is not limited to the atmosphere OA, but water, other liquids, or the like can be appropriately changed. The temperature control target air needs to be separated into a first air conditioning target area and a second air conditioning target area, like air supply SA1 to the first air conditioning target area and air supply SA2 to the second air conditioning target area. Alternatively, the same air or the same object may be used.

<6> In the claims, reference numerals are given for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a refrigerant flow around a compressor unit during normal endothermic operation.

FIG. 2 is a circuit diagram showing a refrigerant flow around an indoor unit during normal endothermic operation.

FIG. 3 is a circuit diagram showing a refrigerant flow around an outdoor unit during normal endothermic operation.

FIG. 4 is a circuit diagram showing the flow of refrigerant around the compressor unit during the thawing operation.

FIG. 5 is a circuit diagram showing a refrigerant flow around the indoor unit during the thawing operation.

FIG. 6 is a circuit diagram showing a refrigerant flow around the outdoor unit during the thawing operation.

FIG. 7 is a schematic diagram showing control of the outdoor unit during the second defrosting operation for the outdoor unit.

FIG. 8 is a schematic diagram showing control of an outdoor unit during a first outdoor unit deicing operation.

FIG. 9 is a circuit diagram showing a refrigerant flow during a conventional normal endothermic operation.

FIG. 10 is a circuit diagram showing a refrigerant flow during a conventional deicing operation.

[Explanation of symbols]

 OA external heat absorption source R heat absorber H heater D detection means E heat absorption evaporator C heat dissipation condenser Sa heat pump circuit Sb heat pump circuit CC switching control means

Claims (2)

[Claims] 1. A heat absorber (R) that absorbs heat from an external heat source (OA), a heater (H) that heats an object to be heated, and a detection means (D) that detects a frozen state of the heat absorber (R). And a plurality of heat pump circuits (Sa) are provided between the heat absorbing evaporator (E) and the heat radiating condenser (C) as a heat pump configuration.
A series circuit group in which (Sb) is thermally interposed in series is provided, and the heat absorber (R) functions as the heat absorption evaporator (E) based on the detection information of the detection means (D), Further, a switching control means for switching the operating state from a normal endothermic operation in which the heater (H) functions as the heat dissipation condenser (C) to an thawing operation in which the heat absorber (R) functions as a condenser and heats up. (CC) provided in the heat pump device, wherein the switching control means (CC) condenses the heat absorber (R) in a predetermined heat pump circuit located at an intermediate or low temperature end in the series circuit group in the deicing operation. A heat pump device configured to function as a container. 2. A plurality of the heat absorbers (R) are provided, and when the switching control means (CC) performs the ice-melting operation for a part of the heat absorbers (R), another heat absorber ( R) is made to function as said evaporator (E) for heat absorption, and said heater (H) is made to function as said condenser (C) for heat radiation, and it is the structure which continues said normal heat absorption operation. The heat pump device described.