KR20140067513A

KR20140067513A - Heat pump system which is not needed defrosting cycle

Info

Publication number: KR20140067513A
Application number: KR20120134829A
Authority: KR
Inventors: 김영선; 이병길
Original assignee: 김영선
Priority date: 2012-11-26
Filing date: 2012-11-26
Publication date: 2014-06-05

Abstract

The present invention relates to a heat pump system that does not require a separate defrost cycle and is particularly susceptible to heat generation in an external evaporator during a winter season and interferes with the exchange of energy with air to evaporate the refrigerant liquid, The heat pump of the present invention uses a refrigerant having a good low-temperature characteristic, a low-temperature acquisition cycle for absorbing heat in the air from the outside-air evaporator, a low-temperature acquisition cycle using a high- The present invention relates to a binary heat pump system composed of a high temperature acquisition cycle in which hot water and heating can be absorbed through heat exchange from a cycle. In order to solve the above problem, an additional refrigeration condenser is installed in a high temperature acquisition cycle, The heat exchange with the acquisition cycle refrigerant and the heating medium with low freezing point (antifreeze) Sending the defrost and residual heat may provide an economical heat pump system is not again absorbed by the low-temperature cycle obtained with the air heat via an external evaporator need for additional defrost cycle the system is a high temperature acquisition cycle passes.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a heat pump system that does not require a separate defrost cycle,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump cooling / heating system, and more particularly, to a heat pump cooling / heating system having a defrosting function capable of defrosting such freezing when an outside air evaporator for air-

Generally, a heat pump cooling / heating system is composed of a compressor, a condenser, an expansion valve, and an evaporator. In a heating cycle, refrigerant evaporates in the outside air evaporator, absorbs heat from air and is sent to the compressor, Heat is generated through heat exchange for heating / hot water. The low temperature and high pressure refrigerant condensed and condensed in the condenser is evaporated in the outdoor evaporator through the expansion valve, and the cycle of absorbing the latent heat in the air is repeated. In the cooling cycle, the outside air evaporator functions as a condenser, and the heat exchanger functions as an evaporator to absorb indoor air heat, thereby discharging heat to the air through the condensation process in the outside air evaporator. In the case of a heat pump having one cycle, it is difficult to obtain high temperature heat for heating. In order to solve this problem, in particular, when the outside air evaporator freezes due to the freezing of the outside air evaporator in a cold weather, it is switched from a heating cycle to a cooling cycle, A defrost cycle is performed in which a high-pressure refrigerant gas is sent to defrost, which causes a problem of lowering the heating efficiency,

In order to solve the above problem, a heat pump of one cycle is connected with two, and the heat is taken from a heat source such as primary air is operated as a low temperature acquisition cycle using a coolant having a good low temperature characteristic, The second cycle for exchanging heat at a high temperature is a heat exchanger that is operated as a high temperature acquisition cycle using a refrigerant having a good high temperature characteristic and can perform heat exchange between refrigerants having different characteristics, System.

However, even in the dual heat pump system, the defrost cycle for deicing the outside air evaporator of the low temperature acquisition cycle is operated. As a result, the same heating efficiency problem as the general heat pump system problem can not be solved. Furthermore, the heat pump configuration becomes complicated to operate the defrost cycle and may also cause a failure of the heat pump system.

The present invention is intended to solve the problem of providing a cause of failure due to a reduction in heating efficiency due to defrost cycle operation and a complicated system for eliminating the freezing of the cold outside air evaporator which is still a problem in the dual heat pump system.

In order to solve the above problems, the present invention provides a refrigeration system that eliminates a defrost cycle for defrosting by sending refrigerant gas of high temperature and high pressure to an outside air evaporator by reverse circulation of refrigerant, In the high-temperature acquisition cycle of the dual heat pump system constituted by the second plate heat exchanger, a vapor phase condenser is provided between the first plate heat exchanger and the cooling expansion valve, an endothermic heat exchanger is installed in the vapor phase condenser, A circulation pump and a circulation conduit are provided for connecting the heat storage tank storing the heat medium having a low freezing point (antifreeze) to the heat absorbing heat exchanger and the heat medium stored in the heat storage tank to the heat radiation heat exchanger installed in the outside air evaporator, It is possible to provide the defrosting means without.

As described above, according to the present invention, the condensation heat obtained by recondensing the high-temperature refrigerant in the high temperature acquisition cycle of the dual heat pump system is indirectly heat-exchanged through the endothermic heat exchanger and stored in the heat storage tank, It is possible to provide an economical dual heat pump system which can simplify the system and reduce the failure rate by eliminating the defrost cycle due to the reverse cycle.

1 is an overall configuration example of a heat pump system according to the present invention;
FIG. 2 is a graph showing the circulation flow rate of the refrigerant and the antifreeze during the heating operation of the heat pump system of the present invention
Fig. 3 is a graph showing the refrigerant flow circulation rate during the cooling operation of the heat pump system of the present invention

Hereinafter, a dual heat pump system without a defrost cycle according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a block diagram of a heat pump cooling / heating system that does not require a defrost cycle according to the present invention;

The heat pump cooling / heating system has a basic structure of a two-cycle system in which a high-temperature acquisition cycle 100 and a low-temperature acquisition cycle 200 are connected via a second plate-type heat exchanger 202, And defrosting means 140 for eliminating freezing of the outside air evaporator 221 of the low temperature acquisition cycle 200. [

In the heat pump cooling / heating system having the above-described two-cycle system as a basic structure, the low temperature acquisition cycle 200 uses a refrigerant having a low temperature characteristic and the high temperature acquisition cycle 100 uses a refrigerant having a high temperature characteristic.

During the summer cooling operation, in the low temperature acquisition cycle 200, the solenoid valves 220 and 224 are closed, the solenoid valves 213 and 210 are opened, and the refrigerant of low temperature and high pressure is passed through the expansion valve 211, The cold water tank 215 takes heat from the water heat source and is transferred to the second compressor 201 through the liquid separator 203. [ The liquid separator 203 is operated to prevent the liquid refrigerant, which has not evaporated, from being sucked into the second compressor 201 to prevent the liquid from being compressed when the evaporation of the refrigerant is poor due to the low temperature of the air heat source or the water heat source, So that only the refrigerant gas is sucked into the second compressor (201). In the second compressor 201, the refrigerant is a high-temperature high-pressure refrigerant gas, and the heat is transferred through the second plate type heat exchanger 202 serving as a condenser through the heat exchange cycle in the high temperature acquisition cycle 100.

During the cooling operation, in the high temperature acquisition cycle 100, the electromagnetic valves 110 and 113 are closed and the defrosting means 140 is not operated, the electromagnetic valve 105 is opened, Heat is transferred from the low temperature acquisition cycle 200 while being evaporated through the second plate heat exchanger 202 operating as an evaporator. The refrigerant is converted into high-temperature, high-pressure refrigerant gas through the first compressor 101, and is heat-exchanged with the heat source of the hot water tank from the first plate heat exchanger 102 operated as a condenser to produce hot water.

During the winter heating operation, in the high temperature acquisition cycle 100, the electromagnetic valve 105 is closed and the electromagnetic valves 110 and 113 are opened to connect the defrosting means 140. Thus, the heat obtained by condensing the refrigerant condensed through the first plate-type heat exchanger again in the defrost condenser 111 is heat-exchanged with the heat medium (antifreeze) having a low freezing point stored in the heat storage tank 115 and the circulation pump 225 is installed The outside air evaporator 221 is defrosted by sending it to the exothermic heat exchanger 222 of the low temperature acquisition cycle 200 through the supply pipe 226 and the return pipe 227 or the retained heat of the heating medium (antifreeze) And the evaporation of the refrigerant liquid is improved by heat transfer.

FIG. 2 is a flow chart of the refrigerant and the antifreeze flow during the heating operation of the heat pump system of the present invention.

2, heat exchange is performed from the high temperature refrigerant of the high temperature acquisition cycle 100 through the defrosting means 140 of the present invention to the outside air evaporator 221 of the low temperature acquisition cycle 200, without reverse cycle system for defrosting, Not only defrost but also a feedback path for transferring the heat of the high temperature refrigerant to the low temperature acquisition cycle 200 can be provided to improve the overall heating efficiency as well as to eliminate the cause of the system failure due to the reverse cycle, Can be provided.

3 is a flow circulation diagram of the refrigerant during the cooling operation of the present invention.

100: High temperature acquisition cycle
101: first compressor
102: first plate heat exchanger
111: Commercial condenser
112: endothermic heat exchanger
115:
200: Low temperature acquisition cycle
201: first compressor
202: second plate type heat exchanger
212: Third plate heat exchanger
203: liquid separator
221: outside evaporator
222: exothermic heat exchanger

Claims

A method of providing a defrosting means without a separate defrost cycle in a two-cycle heat pump system composed of a low temperature acquisition cycle for obtaining heat from a low temperature heat source and a high temperature acquisition cycle in which hot water is supplied from a low temperature acquisition cycle and hot water is produced and heated In this case,

And a defrosting means for increasing the defrosting and heating efficiency by transferring the heat of the high-temperature refrigerant in the high-temperature acquisition cycle to the outside-air evaporator in the low-temperature acquisition cycle.

5. The method of claim 1,

A heat storage tank for condensing and heat-exchanging the high-temperature and high-pressure refrigerant in a high-temperature acquisition cycle through a heat exchanger operating as a condenser for hot water production and heating, and then recondensing the heat obtained by the condenser through a heat exchanger for heat exchange with the heat medium through an endothermic heat exchanger Respectively,

Characterized in that the heating medium of the heat storage tank is circulated through a circulation conduit provided with a circulation pump to the heat radiating heat exchanger to exchange heat with the refrigerant of the outside air evaporator of the low temperature acquisition cycle to accelerate evaporation of the refrigerant and to freeze the freezing of the outside air evaporator