KR20100054245A - Heat pump apparatus - Google Patents

Abstract

PURPOSE: A hybrid heat pump system is provided to stably drive a circulating cycle and to reduce heat loss by including antifreeze vaporization unit using antifreezing solution with high specific gravity. CONSTITUTION: A hybrid heat pump system comprises: an antifreeze tank(7) which contains antifreeze; and an antifreeze circulating pump(8) which vaporizes refrigerant while circulating the antifreeze in the antifreeze tank to a cascade heat exchanger(6). The antifreeze being loose the heat in the evaporation process forms a circulation cycle by re-entering to the antifreeze tank after getting the outdoor air heat while passing through a spiral coil tube of an antifreezing solution heat exchanger(10). An auxiliary heat exchanger(10a) is installed between the antifreeze tank and the antifreezing solution heat exchanger. The antifreeze acquires the heat of the auxiliary heat exchanger in the coldest season.

Description

Hybrid heat pump apparatus

In the air-cooled heat pump device, the antifreeze is circulated through the evaporation unit to obtain the heat of air necessary for evaporation of the refrigerant from the outside air in winter, and the defrost rate of the evaporation unit is reduced, thereby reducing frequent defrosting operations, in particular, below -15 ° C. When the heat of evaporation of the refrigerant is not enough heat in the cold season, the present invention relates to a hybrid heat pump device which can reduce the power cost according to the use of an electric heater by selectively using the geothermal, hydrothermal and waste heat.

Conventionally, Patent Application Nos. 10-2003-0053324 and 10-2003-0066432 show that heat pump cooling and heating are generally performed smoothly, but during heating, the weather and the outside air are particularly high in humidity and image. In the climate of the dew point repeatedly, excessive dropping occurs in the external evaporator (heat exchanger) due to the temperature difference, which causes excessive energy waste to remove it.In particular, when the outside air falls below -5 ℃, evaporation is caused by the boiling point effect of the refrigerant. It did not occur smoothly, reducing efficiency and excessively using accessories such as valves, which are cycle components, resulting in distrust of heat pump efficiency and economic efficiency.

The conventional heat pump system performs flush defrost and hot gas defrost at the time of defrosting, and in the case of flush defrost, the efficiency is good, but the cost of equipment is slightly increased and a large amount of water is consumed, and water is sprayed on the evaporator at the top of the evaporator. When the accumulation of ice on the pin caused the freezing, the operation was stopped, which resulted in heat loss. And defrosting through hot and high-pressure gas during hot gas defrosting is good, but defrosting is good, but the system is complicated by the increase of accessories such as four-way valve or automatic valve, and it is difficult to design reverse circulation liquid refrigerant. In addition, if the refrigerant path is incorrectly configured, the compressor may be in a vacuum state during defrost operation, which may cause engine damage.

In addition, the action of the evaporator in the single- and dual-cooling cycle air-cooled heat pumps always expands the condensed refrigerant below -10 ° C below the outside temperature and sends it to the evaporator. There was a drawback that the injuries were easily induced. This is because air, which is a heat acquisition medium, has a low specific heat and a low specific gravity, so that more air heat can be obtained only when the deltas are larger.

In the conventional heat pump cooling and heating device having such a disadvantage, especially for floor heating and hot water supply, the heat pump efficiency was discharged only when the heat transfer area of the evaporator was designed to be about 18 to 22 m 2 per ton of 1RT refrigeration. As the evaporator became larger, the overall size of the outcasing became larger, resulting in an excessive volume of equipment, which was also constrained by the miniaturization of household equipment receiving general power. In addition, the transport cost, installation cost, etc. was increased, there was a disadvantage that becomes an important factor to weaken the competitiveness.

The present inventors have applied for a heat pump apparatus capable of continuously defrosting to stably obtain air heat without freezing even in a cold weather having a low outside temperature by immersing a heat exchanger in a floating water tank evaporation unit to solve the above conventional problems. Pending as 2007-0037002.

In addition, the inventors of the present invention allow the refrigerant gas circulating in the heat pump cycle and the antifreeze contained in the antifreeze tank to exchange heat with each other in the cascade heat exchanger so that the refrigerant gas is evaporated and the antifreeze is circulated to the coil pipe of the antifreeze heat exchanger. Due to the antifreeze that does not freeze even in ℃ can always obtain a constant air heat even in cold weather, the antifreeze is not a heat exchange method in direct contact with the outside air, but configured in a way that circulates in a closed circuit to reduce the consumption of air released into the atmosphere during the cycle circulation Patent application No. 2008-0047786 discloses a cooling and heating heat pump device having a floating water tank evaporation unit that can stably configure system operation and enable cooling, heating, hot water supply and floor heating.

The present invention relates to an improvement of the inventor's second patent application No. 2008-0047786, and an object of the present invention is to circulate an antifreeze in an evaporation unit so as to obtain the heat of air necessary for evaporation of the refrigerant from outside air in winter and Reduced the frequent defrosting operation, especially when the heat of evaporation of the refrigerant is insufficient only in the cold below 15 ℃ ℃ cold heat by selectively using the geothermal, hydrothermal and waste heat to compensate for the lack of power, using the electric heater The present invention relates to a hybrid heat pump apparatus capable of reducing costs.

Another object of the present invention is that when using the insufficient heat amount required for evaporation of the heat pump as geothermal heat only about 30% of the number of perforations for embedding underground circulation pipes compared to the conventional geothermal heat pump device, so the cost of drilling for pipe laying The geothermal heat is used only when there is a lack of air heat necessary for evaporation. Therefore, when there is a wide lake or easy to use waste heat source due to the topography, it is possible to use water or waste heat that does not need to be drilled. The present invention relates to a wide hybrid heat pump apparatus.

In order to achieve this purpose, the present invention can be divided into three stages in the case of a two-cycle heat pump having a floating water tank evaporation unit, the first air heat acquisition cycle (A), the second low stage heat acquisition cycle (B), and the third high stage side. Divided by heat transfer cycle (C).

As shown in FIG. 1, the first air heat acquisition cycle (A) uses an antifreeze diluted with a mixture of ethylene glycol and the antifreeze to the coil pipe (9) while circulating the antifreeze to the coil pipe (9) in the antifreeze heat exchanger (10). When the outside air is blown, the amount of air heat is obtained by indirect contact with the air and stored in the floating water tank (7). The antifreeze liquid stored in the floating water tank (7) is circulated to the cascade heat exchanger (6) to operate the compressor (1). By the low stage side heat acquisition cycle (B) operation, the antifreeze loses heat and passes through the coil tube 9 of the antifreeze heat exchanger 10, and then heat exchanges with the external air heat caused by the operation of the fan 11. After the endotherm is about 4 ℃ again to form a circulating cycle stored in the floating water tank (7). This circulating air heat acquisition cycle (A) is automatically operated when the low stage heat acquisition cycle (B) is operated to stably acquire as much external air heat as necessary on the cycle, and the antifreeze does not freeze at -37 ° C. Defrosting operation is unnecessary, and because it circulates in a closed circuit, the amount of spontaneous evaporation decreases, so it is not necessary to replenish antifreeze frequently, thereby improving reliability.

If the heat of the air is low at below 15 ℃ and the heat of the refrigerant circulating in the low stage heat acquisition cycle (B) is insufficient, it is possible to supplement the insufficient heat by selectively using geothermal, hydrothermal and waste heat (hereinafter referred to as auxiliary heat source). There is a characteristic. To this end, a cascade-type auxiliary heat exchanger (10a) is connected to the antifreeze heat exchanger (10), and the auxiliary heat exchanger (10a) is connected to an auxiliary heat source (10b) and a circulation pipe (10c) by the antifreeze heat exchanger if necessary. The antifreeze circulating 10 can additionally receive not only air heat but also an auxiliary heat source, thereby providing a heat pump with higher energy efficiency when using the conventional auxiliary heat source as an electric heater.

  Secondly, in the low stage heat acquisition cycle (B), EP-290 refrigerant, which has a relatively low boiling point of -42.7 ° C. at 1 atm, is used. When the heat is supplied from the antifreeze to the lower stage, and is sucked by the compressor (1) and compressed, the amount of heat of 68Kcal per kg KG of refrigerant at the pressure of about 15.5KG / ㎠ to the cascade heat exchanger (3) to condense It cycles through a stable cycle of the process, which automatically operates in conjunction with the high-side heat transfer cycle (C).

Third, the high stage side heat transfer cycle (C) is a cycle for producing hot water and uses a 600a refrigerant boiled at -11.7 ° C under 1 atm, and after absorbing heat in the cascade heat exchanger (3), 10KG / ㎠ in the high stage compressor (12). When compressed to less than 64 Kcal calories per KG, the refrigerant is condensed in the high cascade heat exchanger (14) and then circulated in a cycle leading to expansion evaporation compression, where the heat of condensation is stored as heat exchange with water in the heat storage tank (17). Even under pressure, hot water above 70 ° C can be stored at an economical efficiency of around COP 3.0. At this time, the discharge high pressure of the compressor 12 is low, the compressor 12 is operated very stably even under the rated power consumption, and the high stage heat transfer cycle C is automatically interlocked by sensing the water temperature of the heat storage tank 17. .

In addition, the present invention is configured as a single cycle heat pump system having a floating water tank evaporation unit as shown in Figure 2 divided into the first air heat acquisition cycle (A) and the second heat transfer cycle (D) and to achieve this purpose Back pressure has been improved so that it can be configured as a simple cycle to minimize the potential for pressure drop.

Single-cycle heat pumps have mainly used R-22 refrigerants, but in 2020 they became regulated refrigerants and their boiling point was slightly higher than that of EP-290, which has a boiling point of 42.7 ° C due to the characteristic of a -40.6 ° C boiling point under 1 atm. It can be seen that the percentage decreases. In the present invention, the single cycle heat pump apparatus having the floating water tank evaporation unit (FIG. 3) utilizes a high condensation specific heat per KG of the refrigerant using EP-290 natural refrigerant, and the discharge pressure of the compressor 1 of FIG. When operating, it can take high temperature water above 65 ℃ at 23KG / ㎠, which uses high specific gravity and specific heat as compared to air, which is the advantage of the floating water tank evaporation unit (Fig. 3). It was possible to supply the cascade heat exchanger 6 with sufficient time.

Particularly, it is more stable by satisfying the unstable elements of the refrigerant with natural refrigerant at a lower saturated steam pressure than a general dual-cooling cycle heat pump using a combination of R-22 or R-134 refrigerant and R-410 refrigerant when producing hot water. The cycle can be operated, which makes it possible to build small household heat pumps of less than 3RT using the float tank evaporation unit.

The present invention consists of a heat pump device having a floating water tank evaporation unit using anti-heating and high-heating hot water for cooling, heating and floor heating and hot water supply, so that the equipment can be miniaturized and the cycle can be operated more stably even in cold weather. In addition, the delta t of the amount of heat obtained by the antifreeze from the outside air is less than 5 ° C, which results in a significant drop in the vaporization pin and coil pipe, resulting in almost no defrosting work. Therefore, heat loss can be reduced by more than 10%. have.

In the cold season, the production temperature of the floor heating water for ondol should be close to 70 ° C. In the present invention, since the production of hot water at 70 ° C is easy even when the high-temperature and high-pressure discharge pressure is less than 15kg / ㎠, the durability and power consumption rate of the engine are increased by 20% or more. It has a reducing effect.

In addition, when the heat of the air is low at below 15 ℃ and the heat of the refrigerant circulates in the low stage heat acquisition cycle, the amount of evaporation heat is selectively supplemented by using geothermal, hydrothermal and waste heat. Can be saved. And if geothermal heat is used to drill a plurality of holes in order to bury the heat medium circulation pipe underground, in the case of the present invention, because the geothermal heat is used as an auxiliary heat source only about 30% of the hole compared to the pure geothermal heat pump device because the perforation There is an advantage such as to reduce the cost.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a block diagram of a binary cycle heat pump apparatus having a floating water tank evaporation unit, which is composed of an air heat acquisition cycle (A), a low stage side heat acquisition cycle (B), and a high stage side heat transfer cycle (C).

The low stage heat acquisition cycle (B) is a compressor (1) for compressing a refrigerant at a high temperature and high pressure, a cascade heat exchanger (3) for radiating heat of the compressed refrigerant to a high stage heat transfer cycle (C), An expansion valve (5) for expanding the refrigerant gas and a cascade heat exchanger (6) for obtaining heat by evaporating the refrigerant, which has changed to the liquid phase in the expansion process, in the air heat acquisition cycle (A).

The high stage heat transfer cycle (C) is a high stage compressor (12) for compressing the refrigerant at a high temperature and high pressure, a high stage cascade heat exchanger (14) for radiating heat of the compressed refrigerant to the heat storage tank (17), condensation in the heat dissipation process The high stage expansion valve 16 for expanding the refrigerant gas and the refrigerant changed into the liquid phase in the expansion process are evaporated in the cascade heat exchanger 3 connected to the low stage heat acquisition cycle (B) and circulated again to the high stage compressor (12). It is a structure to let.

The air heat acquisition cycle (A) has an antifreeze tank evaporation unit, an antifreeze tank (7) containing an antifreeze, and an antifreeze circulation pump (8) for circulating the antifreeze to the cascade heat exchanger (6) of the low stage side heat acquisition cycle (B). ), An antifreeze heat exchanger (10) having a coil tube (9) so that the antifreeze passing through the cascade heat exchanger (6) forms a closed circuit and flows helically. The antifreeze heat exchanger (10) is provided with a fan (11) at the top to allow the outside air to pass through the coil tube (9) outer periphery so that the antifreeze flowing in the coil tube (9) to obtain the air heat. Therefore, since the antifreeze is not in direct contact with the outside air, the natural evaporation can be reduced to increase the replenishment cycle, thereby improving reliability.

The antifreeze is a mixture of ethylene glycol and dilution. When the antifreeze is frosted at ultra low temperature, the specific gravity is increased by 1.25 or more. Therefore, the antifreeze circulates the antifreeze circulating pump (8) and the pump slip is generated. do.

To this end, the antifreeze is used by mixing ethylene glycol: heater oil: surfactant in a ratio of 0.7: 0.29: 0.01.

When the heat of evaporation of the refrigerant is insufficient only in the heat of air at -15 ° C. or less during the cold season, the auxiliary heat exchanger 10a of the cascade type between the antifreeze heat exchanger 10 and the floating water tank 7 is used to use the auxiliary heat source 10b. Install and the auxiliary heat exchanger (10a) and the auxiliary heat source (10b) is connected to the circulation pipe (10c) to the heat medium is circulated. In addition, an on-off valve 10e is installed in the circulation pipe 10c to close the circulation pipe 10c and stop the operation of the pump 10d when the auxiliary heat source 10b is not required.

FIG. 2 is a block diagram of a single cycle heat pump apparatus having an evaporation unit having an evaporation unit, and the description thereof is omitted since the high stage side of the dual cycle heat pump apparatus of FIG. 1 is omitted.

The present invention configured as described above has the following operating characteristics.

Referring to FIG. 1, when the compressor 1 starts to operate, the refrigerant is compressed to about 15KG / cm 2, discharged into a high pressure line, condensed at 5 ° C. in the cascade heat exchanger 3 via an oil separator 2, The pressure is lowered through the expansion valve 5 which is the throttling device through the filter drier 4 so that the refrigerant is evaporated in the cascade heat exchanger 6 and sucked into the compressor 1 to circulate the cycle. At this time, the antifreeze of the antifreeze tank 7 in which the heat amount was stored is supplied to the antifreeze circulation pump 8 at the back side of the cascade heat exchanger 6 to supply the amount of heat required for evaporation, and the antifreeze having about 3 ° C. to 4 ° C. lowers the antifreeze again. It is sent to the heat exchanger (10) is circulated through the coil pipe (9) and stored in the floating water tank (7). In addition, the outside air and the antifreeze are indirectly heat exchanged by the operation of the fan 11 during the circulation of the coil tube 9, and experimentally, the antifreeze tank changes to an antifreeze filled with sufficient calories, although it is about 3 ° C. to 5 ° C. lower than the outside temperature. Will be saved.

When the heat acquisition amount of the antifreeze is insufficient only in the cold air heat, the pump 10d is operated so that the heat medium inside the circulation pipe 10c is circulated to the auxiliary heat source 10b. Therefore, the heat of geothermal, hydrothermal and waste heat is absorbed by the heat medium and circulated to the auxiliary heat exchanger (10a) so that the antifreeze stored in the floating water tank (7) obtains the heat of the auxiliary heat source by indirect heating. Evaporation of the refrigerant circulating through the acquisition cycle (B) takes place efficiently.

In addition, in the cascade heat exchanger (3) in the high stage side heat transfer cycle (C), the refrigerant passing through the high stage side expansion valve 16 evaporates to about 5 ° C. At this time, the evaporation temperature is very importantly controlled. It is sucked into the high stage compressor 12 at a temperature of about 8 to 9 ° C., compressed to 12 to 13 KG / cm 2, and condensed by heat exchange with hot water of the heat storage tank 17 in the high stage cascade heat exchanger 14. When expanded through the high stage expansion valve 16, which is the throttling device through the filter drier 15, the pressure is lowered to form a continuous cycle that is sucked back into the high stage compressor 12 through the evaporation process in the cascade heat exchanger (3). .

In consideration of the fact that the temperature of the high temperature water for the purpose of production is that the temperature of the lower end of the heat storage tank 17 is about 5 ° C. lower than the upper part, the heat storage circulation pump 18 installed at the lower end operates the piping line 18-a to the defrost heat exchanger 19. Heat exchange with the high temperature gas in the high stage cascade heat exchanger 14 via the to rise to about 5 ℃ deltat is operated in a circulation cycle to enter the heat storage tank 17 is stored as high temperature heating and hot water of hot water of 70 ℃ or more.

The present invention is characterized by having a floating water tank evaporation unit under a single or two-way refrigeration cycle, and as a result, the operating pressure of the compressor is 5 to 10 kg / cm2 lower than the conventional device due to the characteristics of the refrigerant used. As it produces hot water, it is very economical and has drastically resulted in operating at less than 35% of city gas in winter when heating 40 pyeong of floor and heating.

Importantly, when the device is in operation, the defrosting operation is required in case of dropping the coil tube 9 of the antifreeze heat exchanger 10. In this case, the defrost control automatic valve is stopped after the high stage compressor 12 and the compressor 1 are stopped. When 106 is closed and the defrost control automatic valve 107 operates the antifreeze circulation pump 8 in the open state, the defrosting operation where the low temperature antifreeze passes through the defrost heat exchanger 19 is started. Meanwhile, when the heat storage circulation pump 18 connected to the heat storage tank 17 is operated at the same time and supplied to the back surface of the defrost heat exchanger 19, the antifreeze is heat-exchanged with the hot water of 50 ° C. required for the defrost to flow the antifreeze coil pipe 9. Therefore, the frost attached to the fin and the coil pipe 9 can be easily removed within 1 to 2 minutes. In this case, the heat storage tank 17 supplies about 40 liters of hot water at 60 ° C., according to the capacity of the heat storage tank 17. Although somewhat different, in the case of a 500 liter heat storage tank, the total temperature is lowered by about 1 ° C., which does not significantly affect the entire heating.

In the case of the cooling cycle operation, the dual-cycle heat pump system does not operate the high stage heat transfer cycle (C), but operates only the low stage side heat acquisition cycle (B) and the air heat acquisition cycle (A) which have a small capacity. When the cooling supply signal is operated at 21, the three-way automatic valve 101 is switched to the cooling mode, the cooling automatic valve 102 is opened, and the heating automatic valve 103 is closed, and the high pressure automatic valve 104 and the cooling automatic valve are closed. When the compressor 105 is opened, the compressor 1 is operated and the compressed refrigerant passes through the three-way automatic valve 101 and the cooling automatic valve 102, and the medium-high pressure refrigerant in the cascade heat exchanger 6 is condensed at about 20 ° C. After passing through the high-pressure automatic valve 104 in the refrigerant state of the cooling unit is supplied to the cooling indoor unit 21 through the expansion process in the cooling expansion valve 20, the throttling device to 0 ℃ ~ -5 ℃ degree low temperature refrigerant of the indoor air Absorb calories evaporate Open cooling automatically changed is drawn to pass through the compressor (1) to (105) are re-compressed, driving rotation cycle of condensation, expansion and evaporation performs cooling days.

On the other hand, in the cooling mode of the air heat acquisition cycle (A), the antifreeze of the antifreeze tank 7 of 10 to 15 ° C. is circulated to the antifreeze circulation pump 8 on the back side of the cascade heat exchanger 6 to heat exchange and condense the high temperature and high pressure refrigerant. The heated antifreeze is cooled by air contact by the operation of the fan 11 in the antifreeze heat exchanger 10, stored in the antifreeze tank 7, and supplied with a cooled antifreeze required for condensation of the refrigerant so that the cooling cycle is smoothly operated. do.

The present invention condenses and cools high-temperature refrigerants by circulating antifreeze of high specific heat and specific gravity even during cooling, thereby increasing the cooling efficiency by 20% or more. This is because the refrigerant temperature is cooled to 20 ° C. or lower after condensation and the cycle is formed at a low temperature. Because.

In the anti-freeze tank evaporation unit of FIG. 3, the antifreeze heat exchanger 10 may use a refrigeration outdoor unit standard, but to increase the antifreeze circulation efficiency, the coil pipe 9 has an outer diameter of 9.8 mm as shown in FIG. 4. ~ 12.7mm is mainly used, and importantly, the supply branch pipe (9-2) is a refrigerant gas is circulated in the general refrigeration, so the 6.4mm pipe is mainly used in the present invention, in order to smoothly flow the antifreeze, An engine (9-2) should be used. In addition, since the return pipe uses a copper pipe of the same thickness and the flow path of the fluid is antifreeze, the pipe is composed of an upward flow path through which an antifreeze is supplied to the bottom and recovered to the upper end as shown in FIG. The four lengths of coiled pipe (9-1) are designed in one group, and the length of pipe that is recovered after absorbing air heat by antifreeze is good within 5M.

In the present invention in FIG. 4, the plate fins 9-3 are installed at 2 mm intervals. In general, the conventional air-cooled evaporator is installed at about 3 mm because the fin spacing prevents the air flow easily when appropriately. Large fin spacing results in a larger equipment volume relative to the evaporator heat transfer area. In the present invention, since the evaporation deltat is not large, the dropping is not good, it is installed at intervals of less than 2mm to reduce the volume of the entire evaporator by about 30%.

The float tank evaporation unit is a closed circuit, and once it is replenished in the float tank (7), it is necessary to replenish the capacity of about 0.1 liters every six months if the stopper is assembled. In this case, there is no emission loss, so the environmental effect of leakage is hardly generated.

Since the antifreeze circulation pump 8 is installed at a lower position than the tank, it is not necessary to use a low-cost general circulation pump because the self-suction function is unnecessary. However, an acid resistant circulation pump may be used when an antifreeze 100% solution is inevitably used.

1 is a block diagram of a binary cycle heat pump having a floating water tank evaporation unit

FIG. 2 is a block diagram of a single cycle heat pump apparatus having an evaporation unit for a floating water tank. FIG.

3 is a block diagram of an apparatus showing a float tank evaporation unit;

4 is a coil detail view

<Code Description of Main Parts of Drawing>

1: compressor 2: oil separator 3: cascade heat exchanger

4 filter drier 5 low stage expansion valve 6 cascade heat exchanger

7: antifreeze tank 8: antifreeze circulation pump 9: coil pipe

10: antifreeze heat exchanger 10a: auxiliary heat exchanger 10b: auxiliary heat source

10c: circulation pipe 10d: pump 10e: on-off valve

11: fan 12: high stage compressor

13: oil separator 14: high stage cascade heat exchanger

15 filter dryer 16 high stage expansion valve 17 heat storage tank

18: heat storage circulation pump 19: defrost heat exchanger 20: cooling expansion valve

21: cooling indoor unit 101: three-way automatic valve 102: cooling automatic valve

103: automatic heating valve 104: high pressure automatic valve 105: cooling automatic valve

106: automatic defrost control valve 107: automatic defrost control valve

Claims (3)

In a heat pump apparatus in which a heat storage tank is heated by heat of a refrigerant compressed at high temperature and high pressure in a compressor, and the refrigerant changed into a liquid phase through an expansion valve is evaporated in a cascade heat exchanger and circulated back to the compressor. It is equipped with an anti-freeze tank containing an antifreeze, An antifreeze circulation pump for circulating the antifreeze of the antifreeze tank to the cascade heat exchanger to evaporate the refrigerant, The antifreeze deprived of heat during the evaporation of the refrigerant passes through the spiral coil pipe of the antifreeze heat exchanger to acquire external air heat and then enters a float tank again. An auxiliary heat exchanger is provided between the antifreeze tank and the antifreeze heat exchanger, so that the antifreeze amount of the auxiliary heat source is obtained by the antifreeze when the amount of refrigerant evaporation of the antifreeze by air heat is not enough in the cold temperature below 15 ° C. The method of claim 1, The auxiliary heat exchanger is connected to the auxiliary heat source and the circulation pipe so that the heat medium therein is circulated. The auxiliary heat source is a hybrid heat pump device, characterized in that one of geothermal, hydrothermal and waste heat. The method of claim 2, The antifreeze heat exchanger is provided with a fan for blowing the outside air to the coil pipe is a hybrid heat pump device, characterized in that the heat exchange between the antifreeze and the outside air occurs actively.

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