CN101900458B - A gas-liquid medium and low temperature dual heat source type cascade high temperature heat pump - Google Patents

Abstract

The invention relates to a gas-liquid intermediate-low temperature double-heat source cascade high-temperature heat pump, which is formed by the cascade of a high-temperature heat pump circulating system and a low-temperature heat pump circulating system, wherein the low-temperature heat pump circulating system comprises a low-temperature compressor (1), a liquid heat source type evaporator (2), a heat source type condensation evaporator (5), a low-temperature throttling valve (4) and a connecting pipeline, and the heat pump working fluid is a low-temperature working fluid; the high-temperature heat pump circulating system comprises a high-temperature compressor (1'), the heat source type condensation evaporator (5), a high-temperature condenser (3), a high-temperature throttling valve (4') and a connecting pipeline, and the heat pump working fluid is a high-temperature working fluid; and the heat source type condensation evaporator (5) is provided with a low-temperature heat pump working fluid channel, a high-temperature heat pump working fluid channel and a gas intermediate-temperature heat source channel. The system device of the invention can efficiently provide hot water above 75 DEG C, can be widely used for heating systems of civil buildings, public buildings and villa buildings, and can meet the requirements for high-temperature hot water in the industrial production.

Description

A gas-liquid medium and low temperature dual heat source type cascade high temperature heat pump

technical field

The invention relates to the technical field of heat pump air conditioners, in particular to a gas-liquid mid-low temperature dual heat source type cascade high-temperature heat pump that can provide hot water above 75°C.

Background technique

With the continuous advancement of national energy conservation and emission reduction work, small and medium-sized boilers in cities are gradually being eliminated. At present, there is an urgent need for new high-efficiency energy-saving and environmental protection devices to replace the eliminated small and medium-sized boilers to provide high-temperature hot water above 75°C for heating and production. The traditional heat pump system can only provide hot water with a water temperature not higher than 55°C, which cannot meet the needs of heating and production. However, the single-stage cycle and cascade cycle high-temperature heat pumps currently being studied can only use a single low-temperature or a single medium-temperature heat pump. It is impossible to realize the combined utilization of two or more heat sources, and the operating efficiency is low under high temperature conditions, so it is difficult to popularize and apply.

Contents of the invention

The purpose of the present invention is to provide a comprehensive and rational utilization of renewable energy such as air, solar energy, ground energy, and various waste heat and waste heat for the shortcomings of the above-mentioned prior art. A gas-liquid medium-low temperature dual heat source type cascade high-temperature heat pump for hot water above 75°C.

The purpose of the present invention can be achieved through the following technical measures:

A gas-liquid medium-low temperature dual heat source type cascaded high-temperature heat pump of the present invention is formed by cascading two heat pump circulation systems of high and low temperature:

a. The low temperature cycle includes a low temperature compressor, a liquid heat source type evaporator, a heat source type condensation evaporator, a low temperature throttle valve and connecting pipelines; the heat source type condensation evaporator has a low temperature heat pump working fluid channel, a high temperature heat pump Working fluid channel and a gaseous medium-temperature heat source channel; the inlet of the low-temperature compressor is connected to the outlet of the low-temperature heat pump working medium channel of the liquid heat source type evaporator, and the outlet of the low-temperature compressor is connected to the low-temperature heat pump working medium channel of the heat source condensing evaporator The inlet of the low-temperature heat pump working fluid channel of the heat source condensing evaporator is connected with the inlet of the low-temperature heat pump working medium channel of the liquid heat source evaporator through a low-temperature throttle valve, and the heat pump working medium is a low-temperature heat pump working medium (for a conventional heat pump working fluid used in air conditioning); the inlet and outlet ports of the gaseous medium-temperature heat source channel of the heat source type condensing evaporator are respectively connected with the inlet and outlet pipes of the gaseous medium-temperature heat source to form an independent circuit; the liquid heat source type evaporator The inlet and outlet ports of the heat source channel are respectively connected with the inlet and outlet pipes of the liquid low-temperature heat source to form an independent circuit;

b. The high temperature cycle includes a high temperature compressor, a heat source type condensing evaporator, a high temperature condenser, a high temperature throttle valve and connecting pipelines; wherein the inlet of the high temperature compressor is connected to the outlet of the high temperature heat pump working medium channel of the heat source type condensing evaporator , the outlet of the high-temperature compressor is connected to the inlet of the heat pump working medium channel of the high-temperature condenser; the inlet of the high-temperature heat pump working medium channel of the heat source condensing evaporator is connected to the outlet of the heat pump working medium channel of the high-temperature condenser through a high-temperature throttle valve; the heat pump The working medium is a high-temperature heat pump working medium (a high-temperature heat pump working medium with a relatively high condensation temperature, and its condensation temperature within the normal operating range is ≥ 75°C).

The heat source used by the heat source type condensing evaporator can be air with a temperature ≥ 30°C and various gaseous waste heat and waste heat.

The heat source type condensing evaporator described in the present invention is a fin-in-tube type three-medium composite heat exchanger disclosed in Chinese patent 200720091299.1.

The beneficial effects of the present invention are as follows:

The device of the invention can provide hot water above 75°C, can be widely used in heating systems of civil buildings, public buildings, and villa buildings, and can meet the demand for high-temperature hot water in industrial production.

Description of drawings

Fig. 1 is a structural principle diagram of a gas-liquid medium-low temperature dual heat source type cascade high-temperature heat pump of the present invention.

Serial number in the picture: 1 low temperature compressor, 1' high temperature compressor, 2 liquid heat source type heat exchanger, 3 high temperature condenser, 4 low temperature throttle valve, 4' high temperature throttle valve, 5 heat source type condensing evaporator.

Detailed ways

The present invention will be further described below in conjunction with examples (accompanying drawings), but does not limit the present invention.

Example 1

As shown in Figure 1, a gas-liquid medium-low temperature dual heat source type cascaded high-temperature heat pump in this embodiment is composed of two high-temperature and low-temperature heat pump circulation systems cascaded: the low-temperature cycle includes a low-temperature compressor 1, a liquid Heat source type evaporator 2, heat source type condensing evaporator 5, low temperature throttle valve 4 and connecting pipeline; the heat source type condensing evaporator 5 has a low temperature heat pump working medium channel, a high temperature heat pump working medium channel and a gaseous medium temperature Heat source channel; the inlet of the low-temperature compressor 1 is connected to the outlet of the low-temperature heat pump working medium channel of the liquid heat source evaporator 2, and the outlet of the low-temperature compressor 1 is connected to the inlet of the low-temperature heat pump working medium channel of the heat source condensing evaporator 5; heat source The outlet of the low-temperature heat pump working medium channel of the type condensation evaporator 5 is connected with the inlet of the low-temperature heat pump working medium channel of the liquid heat source type evaporator 2 through the low-temperature throttle valve 4, and the heat pump working medium is a low-temperature heat pump working medium (for a conventional heat pump air conditioner) used working fluid); the inlet and outlet ports of the gaseous medium-temperature heat source channel of the heat source type condensation evaporator 5 are respectively connected with the inlet and outlet pipelines of the gaseous medium-temperature heat source to form an independent circuit; the liquid heat source type evaporator 2 The inlet and outlet ports of the heat source channel are respectively connected with the inlet and outlet pipes of the liquid low temperature heat source to form an independent circuit; the high temperature cycle includes a high temperature compressor 1', a heat source type condensation evaporator 5, a high temperature condenser 3, and a high temperature section flow valve 4' and connecting pipelines; the inlet of the high-temperature compressor 1' is connected to the outlet of the high-temperature heat pump working medium channel of the heat source type condensing evaporator 5, and the outlet of the high-temperature compressor 1' is connected to the high-temperature condenser 3 heat pump working medium channel Inlet; the inlet of the high-temperature heat pump working medium channel of the heat source type condensing evaporator 5 is connected with the outlet of the high-temperature condenser 3 heat pump working medium channel through the high-temperature throttle valve 4'; Higher high-temperature heat pump working fluid, its condensation temperature within the normal operating range is ≥75°C).

The heat source used by the heat source type condensing evaporator can be air with a temperature ≥ 30°C and various gaseous waste heat and waste heat.

The heat source type condensing evaporator described in the present invention is a fin-in-tube type three-medium composite heat exchanger disclosed in Chinese patent 200720091299.1.

Work process of the present invention is as follows:

(1) Single liquid low temperature heat source mode

The working medium of the low-temperature heat pump is compressed by the low-temperature compressor 1, and after releasing heat to the heat source condensing evaporator 5, it enters the liquid heat source evaporator 2 through the low temperature throttle valve 4, and enters the low temperature compressor to enter the next cycle after absorbing the heat of the liquid heat source The high-temperature heat pump working medium is compressed by the high-temperature compressor 1', and after releasing heat to the high-temperature condenser 3, it passes through the high-temperature throttle valve 4' and the heat source-type condensing evaporator 5, and enters the high-temperature compressor after absorbing the heat of the low-temperature heat pump working medium. next cycle.

(2) Single gaseous medium temperature heat source mode

Turn off the low-temperature compressor 1, the high-temperature heat pump working fluid is compressed by the high-temperature compressor 1', releases heat through the high-temperature condenser 3, passes through the high-temperature throttle valve 4', and the heat source type condensing evaporator 5 absorbs heat from a gaseous medium-temperature heat source Then enter the high-temperature compressor to enter the next cycle.

(3) Gas-liquid medium and low temperature dual heat source mode

The working medium of the low-temperature heat pump is compressed by the low-temperature compressor 1, and after releasing heat to the heat source condensing evaporator 5, it enters the liquid heat source evaporator 2 through the low temperature throttle valve 4, and enters the low temperature compressor to enter the next cycle after absorbing the heat of the liquid heat source The high-temperature heat pump working fluid is compressed by the high-temperature compressor 1', and after releasing heat to the high-temperature condenser 3, it passes through the high-temperature throttle valve 4', and the heat source type condensing evaporator 5 absorbs the heat of the low-temperature heat pump working fluid and the gaseous medium-temperature heat source Then enter the high-temperature compressor to enter the next cycle.

Claims (1)

1. Low Temperature Double heat source cascade high-temperature heat pump in the solution-air, it is characterized in that: this device is formed by two heat pump circulating system overlappings of high and low temperature:

A, the circulation of said low temperature comprise cryogenic compressor (1), liquid heat source type evaporimeter (2), heat source type condenser/evaporator (5), cryogenic throttle valve (4) and connecting line; Said heat source type condenser/evaporator (5) has warm source channels in a hot pump in low temp working medium passage, high temperature heat pump working medium passage and the gaseous state; Wherein the import of cryogenic compressor (1) connects the outlet of the hot pump in low temp working medium passage of liquid heat source type evaporimeter (2), and the outlet of cryogenic compressor (1) connects the import of the hot pump in low temp working medium passage of heat source type condenser/evaporator (5); The hot pump in low temp working medium channel outlet of heat source type condenser/evaporator (5) is connected through the import of cryogenic throttle valve (4) with the hot pump in low temp working medium passage of liquid heat source type evaporimeter (2), and its heat pump fluid is a hot pump in low temp working medium; Being connected with the import and export pipeline in warm source in the gaseous state respectively of warm source channels in the gaseous state of heat source type condenser/evaporator (5), constitute independently loop into and out of interface; Being connected with the import and export pipeline of liquid low-temperature heat source respectively of the thermal source passage of said liquid heat source type evaporimeter (2), constitute independently loop into and out of interface;

B, said high temperature circulation comprise high temperature compressed machine (1 '), heat source type condenser/evaporator (5), high temperature condenser (3), high temperature choke valve (4 ') and connecting line; The import of wherein high temperature compressed machine (1 ') connects the outlet of the high temperature heat pump working medium passage of heat source type condenser/evaporator (5), and the outlet of high temperature compressed machine (1 ') connects the import of high temperature condenser (3) heat pump fluid passage; The import of the high temperature heat pump working medium passage of heat source type condenser/evaporator (5) is connected through the outlet of high temperature choke valve (4 ') with high temperature condenser (3) heat pump fluid passage; Its heat pump fluid is a high temperature heat pump working medium.

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