KR200270430Y1 - Heat pump system - Google Patents

Abstract

The present invention relates to a heat pump, the purpose of which is to stably supply a high temperature heat source (hot water, etc.), and even when the evaporation pressure decreases and the condensation pressure rises, there is no performance degradation and increase the power consumption of the compressor, winter outdoor temperature It is composed of low temperature and high temperature heat pump to continuously supply high temperature heat source even in case of decrease, and maintains evaporation pressure of high temperature heat pump to supply high temperature heat source regardless of outside temperature. Even when the heat pump system is defrosted, it is possible to provide a heat pump system that improves performance and reduces power by stably operating a high temperature heat pump system using heat storage heat of a medium temperature tank.

Description

Heat pump system

The present invention is composed of a low temperature and high temperature heat pump to obtain a high temperature heat source (called hot water, etc.) without degrading the performance of the heat pump even when the outside air temperature decreases during winter and during defrosting operation. The present invention relates to a heat pump that continuously supplies a high temperature heat source while maintaining the evaporation pressure and condensation pressure of a high temperature heat pump system even when the outside temperature decreases. It is designed to reduce the power of the compressor and improve the heating capacity by operating stably with heat.

A typical heat pump system includes a compressor for compressing a refrigerant gas at a high temperature and high pressure to a condensation pressure, and a refrigerant compressed in the compressor using coolant (air, not water, in the case of air cooling, and other coolants or devices are used. A condensate condensed into the liquid phase by heat dissipation, an expansion valve for expanding the liquid refrigerant in the high temperature and high pressure state condensed in the condenser into a gaseous refrigerant in the low pressure state by the throttling action, and the refrigerant expanded in the expansion valve. The air blown by the blower by using the latent heat of evaporation of the refrigerant, depending on the type or structure of the liquid, milk or other refrigeration system depending on the object to be cooled, but there are many types of evaporator is used here for explanation) Between refrigerant circulation consisting of an evaporator for cooling and returning refrigerant gas to the compressor. A.

This heat pump system is a system that continuously changes the state from gas to liquid and liquid to gas during the refrigeration cycle, and converts heating and cooling operations to four-sided. Heat pumps are a heat source of high temperature (hot water, etc.) as a heating heat source. Is a system that creates. Conventional heat pumps have been difficult to produce high temperature heat sources (hot water, etc.) and have produced only a small amount intermittently. In addition, when the outside air temperature decreases during the winter, the performance decreases rapidly and the heat source temperature decreases. The evaporation pressure and the specific volume of the compressor suction refrigerant increase, and the pressure ratio, which is the ratio of the discharge pressure of the compressor, increases, thereby reducing the compression efficiency. The lift causes burnout of the compressor. In addition, since the condenser pressure is operated at high temperature and high pressure to make a high heat source temperature, it causes overload of the compressor, causing damage. However, in the conventional heat pump system as described above, the evaporation pressure drop and the condensation pressure rise drastically decrease the performance, and the driving power of the compressor increases, causing the compressor to burn out and wasting energy, and reducing the outside air temperature in winter. Low performance and high energy loss occur due to the decrease in specific volume and efficiency caused by low evaporation temperature. In addition, the conventional heat pump system is operated as a single heat pump system, so that the compression ratio, which is the ratio of the condensation pressure and the evaporation pressure, is large when the outside air temperature decreases, resulting in a decrease in the efficiency and performance degradation of the compressor.

The purpose of the present invention is to stably supply high temperature heat source as heat source output of heat pump, to maintain constant evaporation pressure and condensation pressure of high temperature heat pump system at all times, and to operate with high coefficient of performance (COP) for a year, When defrosting the low temperature heat pump, the evaporation pressure and condensation pressure of the high temperature heat pump system are kept constant, and a stable cycle is formed even when the performance is improved by improving the efficiency of the compressor due to the low compression ratio and when the outside air temperature is decreased in winter. To provide a heat pump system to improve performance and save power.

1 is a schematic diagram of a heat pump system according to the present invention;

<Description of the code | symbol about the principal part of drawing>

1, 51-cold and hot side compressors 2, 52-cold and hot side condensers

4, 54-cold and hot side expansion valves 3, 53-cold and hot side evaporators

30-hot gas heat exchanger 5, 55-receiver

7-heat exchanger 6-four sides

56-High Temperature Tank 11-Medium Temperature Tank

In order to achieve the above object, the heat pump system according to the present invention is composed of a low temperature heat pump system, a high temperature heat pump system, a medium temperature tank, a high temperature tank and a circulation pump.

The low temperature heat pump system includes a compressor for compressing and discharging a refrigerant gas at a high temperature and high pressure, a condenser for condensing the refrigerant compressed in the compressor in a liquid phase, and a liquid refrigerant in a high pressure, high pressure state condensed in the condenser at a low pressure. An expansion valve for expanding the liquid refrigerant, a receiver installed between the condenser and the expansion valve to supply only the liquid refrigerant to the expansion valve, and an object to be cooled using the latent heat of evaporation of the refrigerant while evaporating the refrigerant expanded in the expansion valve. In the heat pump system comprising an evaporator for evaporation while achieving a refrigeration effect by heat exchange to return the refrigerant gas of low temperature and low pressure to the compressor, the heat pump system comprising a hot gas heat exchanger and an evaporator sequentially installed in the evaporator An evaporative heat exchanger for direct heat exchange with outside air; A condenser in which the refrigerant vapor of the high temperature and high pressure and the fruit (hot water, etc.) of the medium temperature tank heat exchange in the condenser so that the refrigerant vapor is changed into a high pressure liquid and the fruit rises in temperature; Hot air is branched from the discharge line of the compressor to control the hot gas control valve every predetermined time, characterized in that the defrosting unit to defrost by supplying a high-temperature, high-pressure refrigerant vapor to the hot gas heat exchanger without passing through the condenser.

The high temperature heat pump system includes a compressor for compressing and discharging a refrigerant gas at a high temperature and high pressure, a condenser for condensing the refrigerant compressed in the compressor into a liquid phase, and a liquid refrigerant in a high pressure, high pressure state condensed in the condenser at a low pressure. An expansion valve for expanding the liquid refrigerant, a receiver installed between the condenser and the expansion valve to supply only the liquid refrigerant to the expansion valve, and an object to be cooled using the latent heat of evaporation of the refrigerant while evaporating the refrigerant expanded in the expansion valve. And an evaporator which evaporates and achieves a low temperature and low pressure gaseous refrigerant gas to the compressor by evaporating while achieving a refrigerating effect by heat exchange, wherein the evaporator is configured to exchange refrigerant liquid by heat exchange with hot water of a heavy tank. An evaporative heat exchanger of the evaporator and the heat source circulation pump for evaporating to steam; It is characterized in that the condenser is configured to heat exchange with the refrigerant medium of high temperature and high pressure and the heat medium circulated by the circulation pump in the high temperature tank so that the refrigerant vapor is converted into a high pressure liquid and the heat medium is converted into high temperature.

The medium temperature tank is connected to the condenser of the low temperature heat pump to create a medium temperature medium (hot water, etc.), supplies the evaporating heat source of the evaporator of the high temperature heat pump, and serves as a supplement water tank of the high temperature tank. The replenishment water of water is supplied automatically and it is the time water.

The high temperature tank recovers the heat of condensation in the condenser of the high temperature heat pump and the temperature is elevated to high temperature and used as a heat source for heating and hot water supply.

Features and advantages of the present invention will become more apparent from the detailed description of the preferred embodiments based on the accompanying drawings. Prior to this, the terms or words used in this specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventors will properly interpret the concept of terms in order to best explain their own design. Based on the principle that it can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Referring to FIG. 1, a heat pump system according to the present invention will be described in order of a low temperature heat pump system, a high temperature heat pump system, a medium temperature tank, and a high temperature tank.

The low temperature heat pump is a compressor (reference numeral 1) of FIG. 1, which sucks refrigerant gas, compresses it to high temperature and high pressure, and discharges it. The reciprocating type, crank type, swash plate type, wobble plate type, and rotary type according to the purpose of use thereof. Various types of compressors, such as a scroll type and a scroll type, may be applied. The discharge line of the compressor (1) is connected to the condenser (2), the condenser (2) is condensed into a liquid refrigerant of high temperature and high pressure by radiating the refrigerant gas compressed and discharged from the compressor (1). Although not shown in detail here, the condenser 2 may be applied in the form of a plate heat exchanger, a cell-and-tube and a tube-in tube. Accordingly, the refrigerant circulated into the condenser 2 by the heat medium circulation pump 16 of the medium temperature tank 11, and in this process, the refrigerant flowing in the condenser 2 is deprived of heat to the heat medium, thereby condensing the refrigerant. . On the other hand, the inlet line side of the compressor (1) by evaporating the refrigerant flowing from the expansion valve (4) to be described later by using the latent heat of evaporation at this time evaporator (3) to heat exchange the object to be cooled and the refrigerant to achieve a freezing effect (3) And a liquid separator is installed between the evaporator 3 and the compressor 1 to separate the liquid refrigerant contained in the refrigerant gas discharged from the evaporator 3 and return only the refrigerant gas to the compressor 1. do. In addition, at the inlet end of the evaporator 3, the expansion valve 4 for supplying the liquid refrigerant in the high temperature and high pressure state to the refrigerant in the low pressure state by the throttling action to supply the evaporator 3 so that the evaporation is easily performed. Is installed. Although not shown in detail here, the expansion valve 4 has an internal pressure equalization, capillary tube for controlling the opening degree of the high pressure refrigerant flow path through the pressure transfer rod by the expansion displacement of the diaphragm according to the temperature inside the temperature reduction chamber. The thermostatic expansion valve, generally called TEV, is used, such as external pressure control to control the opening degree of the high pressure refrigerant flow path by the expansion displacement of the diaphragm. The inlet end side of the expansion valve 4 is provided with a receiver 5 for supplying only the liquid refrigerant to the expansion valve 4. The receiver 5 temporarily stores the refrigerant in response to load fluctuations of the refrigerating cycle, and also serves to separate uncondensed refrigerant or non-condensed gas contained in the liquid refrigerant.

According to the present invention, the evaporator (3) is provided with a heat exchanger, which comprises the evaporator (3) and the hot gas heat exchanger (30), the evaporator (3) by heat exchange between the outside air and the refrigerant liquid Refrigerant liquid evaporates from the liquid phase to vapor and cools the air.

The hot gas heat exchanger 30 heats the air at the inlet of the evaporator during defrosting and precooling of the refrigerant liquid. The hot gas heat exchanger 30 is used as a heat source during defrosting by hot gas passing through the hot gas valve 10 branched from the discharge line of the compressor 1 and is operated by a periodic signal. In addition, the cold heat source evaporator 9 branched from the outlet of the condenser 2 lowers the pressure of the refrigerant condensed in the condenser 2 as it passes through the expansion valve 8 to evaporate in the cold heat source evaporator 9, Water, brine, etc.) are cooled, evaporated and sucked into the compressor (1).

According to the present invention, the inlet end side of the compressor 1 is connected to direct suction of the refrigerant vapor passed through the liquid separator 31 and the heat exchanger (7).

The high temperature heat pump is a compressor 51 of FIG. 1, which sucks refrigerant gas and compresses the refrigerant gas to high temperature and high pressure. The discharge line of the compressor 51 is connected to the condenser 52, and the condenser 52 is The refrigerant gas compressed and discharged by the compressor 51 is radiated to condense into a liquid refrigerant having a high temperature and high pressure. Although not illustrated in detail, the condenser 52 may be applied in the form of a plate heat exchanger, a cell-and-tube, and a tube-in tube. Therefore, the heat medium of the heat source tank 56 is circulated into the condenser 52 by the circulation pump 59, and in this process, the temperature of the refrigerant flowing in the condenser 52 is lost to the heat medium, and condensation of the refrigerant is prevented. Is performed.

On the other hand, the inlet line side of the compressor 51 by evaporating the refrigerant flowing from the expansion valve 54 to be described later by using the latent heat of evaporation at this time evaporator 54 to achieve a refrigeration effect by heat-exchanging the object to be cooled with the refrigerant. Is connected, and a liquid separator is installed between the evaporator 53 and the compressor 51 to separate the liquid refrigerant contained in the refrigerant gas discharged from the evaporator 53 and return only the refrigerant gas to the compressor 51. do.

In addition, an expansion valve 54 for supplying the liquid refrigerant in the high temperature and high pressure state supplied to the inlet end of the evaporator 53 to the evaporator 53 so that the evaporation is easily performed by expanding the liquid refrigerant in the low pressure state by the throttling action. Is installed.

In addition, the inlet end side of the expansion valve 54 is provided with a receiver 55 for supplying only the liquid refrigerant to the expansion valve 54.

According to the present invention, in the evaporator 53, the heat medium of the medium temperature tank 11 is heat-exchanged with the refrigerant liquid, and the refrigerant liquid of the evaporator 53 evaporates from the liquid phase to the vapor, and the heat medium is cooled and circulated to the medium temperature tank 11. It is circulated by the pump 12. The medium temperature tank 11 heats up by heat-exchanging with the condenser 2 of the low temperature heat pump, and cools by heat-exchanging with the evaporator 53 of the high temperature heat pump. The auxiliary tank 11 controls the compressor 1 by the temperature sensor 60 to maintain a constant temperature. In addition, heat is stably supplied to the evaporator 53 of the high temperature heat pump even when the evaporator 3 of the low temperature heat pump is defrosted. The high temperature tank 56 heats up with the condenser 52 of the high temperature heat pump, and heats up to high temperature. At this time, the circulation of the heat medium is by the circulation pump 59, and the heat medium refill of the high temperature tank 56 is automatically supplied by the valve 58 and the check valve 57 of the medium temperature tank.

As apparent from the above description, the present invention stably supplies the high temperature heat medium as the heat source output of the heat pump, maintains the constant evaporation pressure and condensation pressure of the high temperature heat pump system at all times, and has high performance coefficient for a year. (COP) and keeps the evaporation and condensing pressure of the high temperature heat pump system constant even when defrosting the low temperature heat pump, and improves performance by improving the efficiency of the compressor due to the low compression ratio and decreases the outside air temperature in winter. Equipped with a stable cycle to improve the performance and power saving, the heat pump system device is attached to the refrigeration equipment, such as the existing heat pump has the effect of improving the performance and energy saving.

Claims (1)

A heat pump system consisting of a low temperature heat pump system, a high temperature heat pump system, a medium temperature tank, a high temperature tank, and a circulation pump in a heat pump system using a refrigerant gas. An evaporator that absorbs heat by exchanging heat with a heat source and a refrigerant of an outside air. To heat the medium by exchanging heat with the high temperature and high pressure refrigerant gas at the compressor outlet and the heat medium of the medium temperature tank, and condenser condensing the refrigerant vapor, and compressing the low pressure refrigerant at the outlet of the evaporator to high temperature and high pressure. A low temperature heat pump system comprising a bypass valve of a hot gas and a hot gas heat exchanger and an evaporator for a cold source for defrosting and controlled by a temperature sensor of a medium temperature tank during defrosting; An evaporator that evaporates the refrigerant with heat absorbed by heat exchange with heat medium of medium temperature tank, and cools the heat medium. A high temperature heat pump system composed of a compressor for compressing a low pressure refrigerant at an outlet to a high temperature and high pressure and controlled by a temperature sensor of a high temperature tank; It heats up the heat medium by the heat exchange by the circulation of the heat medium by the condenser and the circulation pump of the low temperature heat pump, and the heat exchange by the circulation of the heat medium by the circulation pump as a heat source of the evaporator of the high temperature heat pump. A medium temperature tank that supplies heat to the evaporator of the high temperature heat pump stably even when defrosting the low temperature heat pump, and is automatically replenished from the outside and used as a water supply source of the high temperature tank; A heat pump system for heating a heat medium by heat exchange by circulation of a heat medium by a condenser and a circulation pump of a high temperature heat pump, and automatically supplying water from a medium temperature tank.