WO2012161456A2

WO2012161456A2 - Heat pump system

Info

Publication number: WO2012161456A2
Application number: PCT/KR2012/003820
Authority: WO
Inventors: 진주환
Original assignee: Jin Ju-Hwan
Priority date: 2011-05-23
Filing date: 2012-05-16
Publication date: 2012-11-29
Also published as: WO2012161446A3; KR101258181B1; WO2012161456A3; KR20120130357A; WO2012161446A2

Abstract

The present invention relates to a heat pump system, and more specifically, to hot water generation of an air heat source type heat pump system, and a defrosting and cooling structure of an outdoor heat exchanger, for increasing the efficiency of use of a costless heat source, enhancing the coefficient of performance to a satisfactory level, and generating hot water at all times. The present invention comprises: a basic freeze cycle (10) having a compressor (11), a 4-way valve (12), an indoor heat exchanger (13), an expansion valve for cooling (14), an expansion valve for heating (15), an outdoor heat exchanger (16), and the 4-way valve (12), connected with a refrigerant conduit (17) in the respective order, and having the 4-way valve (12) and the compressor connected with a refrigerant suction conduit (18); a hot water heating circuit (20) placed between the compressor (11) and the 4-way valve (12) of the refrigerant conduit (17); a defrosting and cooling means (30) for mounting an auxiliary heat exchanger (32) on the outdoor heat exchanger (16), and mounting a heat exchanger (31) on a costless heat source storage tank (33), so that the auxiliary heat exchanger (32) and the heat exchanger (31) are connected to a heat medium supply pipe (34a) having a circulation pump (35) built thereon and a heat medium return pipe (34b), so as to form a closed circuit; and performance enhancing means placed at the heat medium supply pipe (34a) and between the outdoor heat exchanger (16) and the 4-way valve (12) of the refrigerant conduit (17).

Description

Heat pump system

TECHNICAL FIELD The present invention relates to a heat pump system, and more particularly, to hot water generation of an air heat source heat pump system, and a defrost and cooling structure of an outdoor heat exchanger.

As is well known, the heat pump operates the steam compression refrigeration cycle in the opposite direction to the cooling (freezing) operation, i.e., the indoor heat exchanger acts as the condenser and the outdoor heat exchanger as the evaporator during the heating operation, and the outdoor heat exchanger during the cooling operation. In order to improve the coefficient of performance, the refrigerant is evaporated or condensed in the outdoor heat exchanger.

However, the air heat source heat pump is installed to expose the outdoor heat exchanger to the outside air to evaporate or condense the refrigerant by the outside air, and especially on the surface of the outdoor heat exchanger acting as an evaporator when the outside air temperature falls below the dew point temperature during the heating operation. Condensation of the refrigerant liquid in the outdoor heat exchanger, which acts as a condenser when the frost condenses, may cause the evaporation of the refrigerant gas to decrease or become impossible, leading to a significant drop in the coefficient of performance or to an inoperability. The poor coefficient of performance is deteriorating, and the above-mentioned problem has been solved, which is one of the key topics in the development of heat pump technology.

In order to solve the degradation or inoperability of the above-mentioned problems during the heating operation, the refrigeration cycle is converted into a reverse cycle, that is, the outdoor heat exchanger acting as an evaporator is acted as a condenser, or an electrothermal heater is installed in the outdoor heat exchanger. It is well known to deteriorate the coefficient of frost by defrosting the frost attached to the surface, but the former causes the heating operation to be interrupted, and the latter is not only to improve the coefficient of coefficient but also requires extra energy.

On the other hand, in recent years, the reduction of environmental pollution and energy cost due to air pollution has emerged as a social problem, and in particular, all industries are striving to solve the above-mentioned social problems. The use of is becoming common.

Regarding the defrosting and cooling promotion structure of the outdoor heat exchanger of the air heat source heat pump system which corrects the problems caused by the above-mentioned well-known defrosting technique, namely, the reverse cycle operation and the installation of the electric heater, and improves the coefficient of performance by the non-heating heat source. The invention is disclosed in Patent Document 1.

The defrosting and cooling promotion structure of the outdoor heat exchanger of the air heat source heat pump system of Patent Document 1 includes a compressor, a four-way valve, an indoor heat exchanger, a cooling expansion valve, a heating expansion valve, an outdoor heat exchanger, and the four-way. A basic refrigeration circuit connecting the valves in order to the refrigerant conduit and connecting the four-way valve and the compressor to the refrigerant suction conduit; Both ends of the bypass refrigerant conduit are connected between the cooling and heating expansion valves of the refrigerant conduit to install a heating heat exchanger in the bypass refrigerant conduit, and surround the heating heat exchanger and install a heat medium therein. Injected heat storage tank; An auxiliary heat exchanger installed in the outdoor heat exchanger by connecting a heat medium supply pipe having a heat medium circulation pump to the heat storage tank and a heat medium return pipe; A heat exchanger is installed in the heat medium supply pipe and the heat medium return pipe, and the heat medium supply pipe and the heat medium return pipe are installed, and an outdoor heat exchanger defrost and cooling means is provided around the heat exchanger.

The defrost and cooling promotion structure of the outdoor heat exchanger of the air heat source heat pump system is heat transfer between the non-heat source and the heat medium circulating the heat exchanger supplied to the non-heat heat source storage tank to maintain a constant temperature to maintain a constant temperature Is circulated to the auxiliary heat exchanger installed in the outdoor heat exchanger to defrost the frost attached to the outdoor heat exchanger during the heating operation, to improve the coefficient of performance by cooling the outdoor heat exchanger during the cooling operation, and the heating medium heated in the heat storage tank is When the amount of heat source is small, the auxiliary heat exchanger is circulated to defrost the outdoor heat exchanger during the heating operation, and the cooling coefficient is maintained to be satisfactorily maintained by supercooling the refrigerant liquid condensed in the indoor or outdoor heat exchanger.

[Patent Document 1] KR 10-0970870 (B1)

However, the defrosting and cooling facilitation structure of the outdoor heat exchanger of the air heat source heat pump system provides good heat source (latent heat) contained in the air when the refrigerant liquid or refrigerant vapor circulating the outdoor heat exchanger is evaporated or condensed by the atmosphere. A forced convection type outdoor heat exchanger installed with a fan should be used for the purpose of use.The auxiliary heat exchanger installed in the forced convection type outdoor heat exchanger as described above has a heating medium (with brine) of a predetermined temperature (about 20 ° C.) heated in a heat-free storage tank for free use. When defrosting the frost attached to the outdoor heat exchanger by driving the fan while circulating), the heat of the heat source for the non-heat source is lost (discharged) due to the suction or pressure of the fan. Low and low utilization efficiency of the non-heat source for heat as described above, the improvement of the grade coefficient is also low Claim to being able dots.

The present invention is to correct the above problems, to improve the utilization efficiency of the non-heat source for circulating the heat medium heat-exchanged with the non-heat source for heat to the outdoor heat exchanger, to improve the coefficient of performance well, during heating operation or cooling operation It is an object to provide an air heat source heat pump system that is capable of producing good multi-purpose hot water at all times.

In order to achieve the above object, the present invention is connected to the compressor, 4-way valve, indoor heat exchanger, cooling expansion valve, heating expansion valve, outdoor heat exchanger and the 4-way valve in order to the refrigerant conduit, A basic refrigeration cycle connecting the way valve and the compressor to the refrigerant suction conduit; A hot water heating circuit disposed between the compressor of the refrigerant conduit and the 4-way valve; Defrosting and cooling means for installing an auxiliary heat exchanger in the outdoor heat exchanger and installing a heat exchanger in a heat-free storage source for heat, connecting the auxiliary heat exchanger and the heat exchanger so that a closed circuit is formed by a heat medium supply pipe and a heat medium return pipe provided with a circulation pump; And a performance improving means installed between the outdoor heat exchanger and the 4-way valve of the heat medium supply pipe and the refrigerant conduit.

As described above, the present invention heats and heats an auxiliary heat exchanger installed in an outdoor heat exchanger by heating a heat source for circulating a heat source and a heat exchanger to heat or cool and then circulating the heated or cooled heat medium and driving a fan. It prevents the adhesion of frost to the outdoor heat exchanger or defrosts the attached frost, and during the cooling operation to condense the refrigerant vapor in the outdoor heat exchanger, in the case of the above heating operation, the heat retention of the heat medium heated in the heat exchanger By circulating the auxiliary heat exchanger after releasing from the heat radiating heat exchanger of the enhancement means to circulate the auxiliary heat exchanger to prevent waste of heat discharged to the atmosphere by the fan and supplying the heat radiating heat of the heat radiating heat exchanger to the heat absorption and heat radiating heat exchanger. Can evaporate or superheat steam Aekbaek to prevent liquid hammer or of the compressor to prevent damage to the compressor and also to addition to improving the coefficient of performance.

In the cooling operation described above, the refrigerant vapor of the high temperature and high pressure compressed by the compressor is first condensed in the endothermic and heat radiating heat exchanger of the performance improving means before condensing in the outdoor heat exchanger, and then recondensed in the outdoor heat exchanger. Because of the good condensation, this also contributes to the improvement of the coefficient of performance, which can improve the performance.

In addition, the present invention can improve the quality of life even more by using a multi-purpose to generate hot water at the same time the heating operation or cooling operation at all times.

1 is a block diagram of an embodiment of the present invention.

1 is a block diagram of an embodiment of the present invention, which is roughly divided into a basic refrigeration cycle 10, a hot water heating circuit 20, a defrosting and cooling means 30, and a performance improving means 40. As shown in FIG.

The basic refrigeration cycle 10 includes a compressor 11, a 4-way valve 12, an indoor heat exchanger 13, a cooling expansion valve 14, a heating expansion valve 15, an outdoor heat exchanger 16 and The 4-way valve 12 is connected in sequence to the refrigerant conduit 17, and the 4-way valve 12 and the compressor 11 are connected to the refrigerant suction conduit 18, and the basic refrigeration cycle 10 Is based on the air heat source.

The hot water heating circuit 20 is installed between the compressor 11 of the refrigerant conduit 17 and the four-way valve 12 to always supply hot water at the same time as the operation of the basic refrigeration cycle 10, that is, heating operation or cooling operation. Generated and used for bathing or hot water supply, or as other radiant heat generating means, and supplied to the floor-mounted heat dissipation coil, radiator and fan coil unit installed at a different position from the indoor heat exchanger 13 or a different position from the indoor heat exchanger 13. To use for heating or drying.

The hot water heating circuit 20 connects both ends of the refrigerant vapor bypass conduit 21 at regular intervals between the compressor 17 of the refrigerant conduit 17 and the four-way valve 12 to provide the refrigerant vapor bypass conduit. A condenser 22 is provided at the 21, a heating heat exchanger 23 is provided at the condenser 22 to maintain a heat exchange relationship with the condenser 22, and a heating bath with the heating heat exchanger 23 is provided. 24 is connected to a suction pipe 25b provided with a supply pipe 25a and a circulation pump 26, the inlet of the refrigerant vapor bypass conduit 21 and the refrigerant vapor bypass conduit of the refrigerant conduit 17 ( The solenoid valves 27a and 27b are provided between the connecting portions of both ends 21 so that the refrigerant vapor compressed by the compressor 11 flows into the refrigerant vapor bypass conduit 21. 22 to heat the hot water flowing through the heating heat exchanger 23 by the heat of the condensation And stored in a low tangjo 24 is used for the required purpose.

The defrosting and cooling means 30 may install the heat exchanger tube of the auxiliary heat exchanger 32 between the heat exchanger tubes of the outdoor heat exchanger 16, or fin the auxiliary heat exchanger 32 on the side of the outdoor heat exchanger 16. fins are integrally formed and integrally formed, or a separate auxiliary heat exchanger 32 is provided on the side of the outdoor heat exchanger 16, and a heat exchanger 31 is provided in the heat source storage tank 33 for the non-thermal. The auxiliary heat exchanger 32 and the heat exchanger 31 are connected to each other in such a way that a closed circuit is formed by the heat medium supply pipe 34a and the heat medium return pipe 34b provided with the circulation pump 35, and the heat exchanger 31 and the like. Is injecting a heat medium (a material having a low freezing temperature such as ethylene glycol).

The heat source supplied to the unheated heat source storage tank 33 is to prevent environmental destruction by using renewable energy such as river water, sea water, ground water collected, solar heat collecting device (air or hot water), rainwater, waste water, etc. The higher the temperature of the non-heating heat source is, the higher the temperature is particularly good in a cold operation, and it is better not to exceed 25 ° C in the cooling operation.

The performance improving means 40 is provided between the heat exchanger supply pipe 34a and the outdoor heat exchanger 16 of the refrigerant conduit 17 and the four-way valve 12. The wet saturated vapor sucked into 11) is heated, and during the cooling operation, the high temperature and high pressure refrigerant vapor compressed by the compressor 11 is first cooled before being supplied to the outdoor heat exchanger 16.

The performance improving means 40 is provided with a heat dissipation heat exchanger 41 in the heat medium supply pipe (34a), the heat dissipation heat exchange between the four-way valve 12 and the outdoor heat exchanger (16) of the refrigerant conduit (17) The heat absorption and heat dissipation heat exchanger 42 is provided so as to maintain a heat exchange relationship with the gas 41.

A bypass conduit 37 for bypassing the heat dissipation heat exchanger 41 is connected to the heat medium supply pipe 24a, and a 3-way valve is connected to the inlet side connection portion of the heat medium supply pipe 34a and the bypass conduit 37. 38) is installed so that the heating medium is supplied to the heat dissipation heat exchanger 41 during the heating operation, and the heating medium flows through the bypass conduit 37 during the cooling operation to prevent heating of the heating medium, In the cooling heat exchanger 42, the condensation of the refrigerant vapor is improved.

Reference numeral 28a is a water supply pipe, 28b is a hot water supply pipe, and 51 and 52 are check valves. In addition, the outdoor heat exchanger 16 is provided with a suction type or a pressurized fan (not shown) to improve the evaporation of the refrigerant liquid and the condensation of the refrigerant vapor, which is well known in an air heat source heat pump.

In the present invention as described above, the indoor heat exchanger 13 is heated by operating the 4-way valve 12 so that the refrigerant flows in the solid line of the arrow in FIG. It functions as a condenser at the time of operation and as an evaporator at the time of cooling operation, and functions as a heating function and a cooling function is the same as the conventional thing.

When the outside air temperature falls below the dew point temperature during the heating operation and the cooling operation as described above, or when the non-thermal heat source is circulated to the non-thermal heat source storage tank 33 in a cold weather or the like, it is heat-exchanged with the heat medium in the heat exchanger 31, and the heat medium is heated. In operation, the temperature is higher than the outside temperature, and in the cooling operation, the temperature is lower than the outside temperature. When the heat medium higher or lower than the outside temperature is circulated in the auxiliary heat exchanger 32 by driving the circulation pump 35, the heating operation is performed. It prevents frost from forming on the heat exchanger tube and fin of the outdoor heat exchanger 16 or defrosts the formed frost. During cooling operation, the heat transfer tube and fin of the outdoor heat exchanger 16 is cooled to improve the condensation of the refrigerant gas. In the above operation, the temperature of the non-heating heat source is better in cold weather during the heating operation, and exceeds 25 ° C. during the cooling operation. Preferably it is.

When the heat medium heat exchanged in the heat exchanger 31 is circulated to the auxiliary heat exchanger 32 as described above, when the three-way valve 38 is operated so that the heat medium flows to the heat radiating heat exchanger 41 during the heating operation. The heat medium passing through (41) dissipates its retaining heat to wet vaporized steam sucked into the compressor (11) via the endothermic and heat dissipating heat exchanger (42) after evaporating in the outdoor heat exchanger (16). After being lowered, heat is dissipated in the auxiliary heat exchanger 32 installed in the outdoor heat exchanger 16, thereby reducing the heat loss of the heat medium to the atmosphere even when the fan is driven, thereby increasing the utilization efficiency of the non-heat source for heat and improving the coefficient of performance. You can do it.

As described above, the wet saturated vapor vaporized in the outdoor heat exchanger 16 and sucked into the compressor 11 is heated by heat radiation (heat exchange) of the heat medium circulating through the heat radiating heat exchanger 41 to dry the saturated steam or superheated steam. The lower surface of the compressor 11 prevents liquid bag or liquid from occurring, thereby improving the reliability of the compressor 11 and improving the coefficient of performance.

As described above, during the cooling operation when the heat medium heat-exchanged in the heat exchanger 31 is circulated to the auxiliary heat exchanger 32, the high-temperature / high-pressure refrigerant vapor compressed by the compressor 11 is transferred to the outdoor heat exchanger 16. The first condensation is passed through the endothermic and heat dissipating heat exchanger 32 before condensation and then recondensed in the outdoor heat exchanger 16, thereby improving the condensation of the refrigerant vapor. At this time, the three-way valve 38 is operated so that the heat medium flows toward the bypass conduit 37 to prevent the heat medium from being heated by the heat of release of the endothermic and heat dissipating heat exchanger 42. Only the following heat medium is circulated to improve the condensation of the refrigerant vapor.

When the hot water is to be generated during the heating operation or the cooling operation as described above, the solenoid valve 27a is opened and the solenoid valve 27b is kept open or fully closed or partially closed. All or part of the high-temperature and high-pressure refrigerant vapor compressed in (11) flows into the above-mentioned heating circuit or cooling circuit while condensing in the condenser 22 while flowing into the refrigerant vapor bypass conduit 21, and the refrigerant in the condenser 22. The condensation heat when the steam is condensed is exchanged with the hot water to be heated flowing in the heating heat exchanger 23 to heat the hot water and stored in the water storage tank 24 along the supply pipe 25a and also by the circulation pump 26. It is heated by the heat of condensation of the refrigerant vapor while repeatedly flowing through the heat exchanger (23). The heated hot water is used for multipurpose purposes such as bathing, hot water supply, heating, drying and the like. And the opening and closing amount of the solenoid valve (27a) (27b) can be adjusted according to the production amount of hot water or the purpose of use of the indoor heat exchanger (13).

Claims

A compressor, a 4-way valve, an indoor heat exchanger, a cooling expansion valve, a heating expansion valve, an outdoor heat exchanger, and the 4-way valve are sequentially connected to the refrigerant conduit, and the 4-way valve and the compressor are connected to the refrigerant suction conduit. A basic refrigeration cycle; A hot water heating circuit disposed between the compressor of the refrigerant conduit and the 4-way valve; A defrosting and cooling means for installing an auxiliary heat exchanger in the outdoor heat exchanger and installing a heat exchanger in a heat-free storage source for heat, connecting the auxiliary heat exchanger and the heat exchanger so that a closed circuit is formed by a heat medium supply pipe and a heat medium return pipe provided with a circulation pump; And a performance improving means installed between the outdoor heat exchanger and the 4-way valve of the heat medium supply pipe and the refrigerant conduit.
The hot water heating circuit of claim 1, wherein both ends of the refrigerant vapor bypass conduit are connected between the compressor of the refrigerant conduit and the four-way valve to install a condenser in the refrigerant vapor bypass conduit, wherein the condenser is connected to the condenser and the heat exchanger. A heat pump system in which a heating heat exchanger is installed to maintain a relationship, and the heating heat exchanger and the storage tank are connected to a suction pipe provided with a supply pipe and a circulation pump.
The heat pump system according to claim 1, wherein the performance improving means includes a heat dissipation heat exchanger in the heat medium supply pipe, and an endothermic and heat dissipation heat exchanger between the outdoor heat exchanger and the 4-way valve of the refrigerant conduit so as to maintain a heat exchange relationship with the heat dissipation heat exchanger. .
4. The heat pump system according to claim 3, wherein a bypass conduit for bypassing the heat dissipation heat exchanger is connected to the heat medium supply pipe, and a 3-way valve is provided at an inlet side connection part of the heat medium supply pipe and the bypass conduit.