Grade compression-segmenting heat-taking type steam compression heat pump

Abstract

The invention provides a multistage compression and stepwise heat utilization steam compression heat pump, which belongs to the technical field of waste heat utilization and heat pump refrigeration. Aiming at the shortcomings of the single condensation to heat release unit in stage compression and inter-stage cooling, the heat pump provides the steam compression unit which comprises two or more compressors, two or more condensers, an evaporator and a throttle valve, and the steam compression unit can implement condensation and heat release to outside respectively by each compression and heat moving flow. A low temperature compression and heat release flow is composed of a low-pressure compressor and condenser, a throttle valve and a evaporator; a high-temperature compression and heat moving flow is composed of a high-pressure compressor and condenser, a throttle valve and other parts by virtue of the structure of the low-temperature compression and heat moving flow; the residual heat medium can release heat by flowing through the evaporator; the heat medium absorbs heat by flowing through the each compression and heat moving flow. The multistage compression and stepwise heat utilization steam compression heat pump has the advantages that: the heat transfer temperature difference is reduced; the unit performance index is improved; while being used as a heat pump, the heat pump is particularly suitable for the occasion with high heat supply temperature and wide range, and can be used for refrigeration and power consumption reduction.

Description

technical field [0001] The utility model belongs to the field of waste heat utilization and heat pump / refrigeration technology. Background technique [0002] Vapor compression heat pump is one of the main equipment in waste heat application, which can bring many benefits such as energy saving, environmental protection and economy. The vapor compression heat pump is mainly composed of basic components such as a compressor, a condenser, a throttle valve, and an evaporator. Its heat supply mainly depends on the condensation heat release of the working fluid in the condenser to complete the heating of the cold fluid. The quality of the condensing temperature should meet the highest temperature demand of the user. When the waste heat temperature is fixed, the higher the heat demand temperature of the user, the higher the compression ratio of the compressor, and the performance index of the unit drops significantly and is low; in order to improve the performance index of the unit...

AI Technical Summary

Problems solved by technology

When the waste heat temperature is fixed, the higher the heat demand temperature of the user, the higher the compression ratio of the compressor, and the performance index of the unit drops significantly and is low; in order to improve the performance index of the unit, generally adopt staged compression and interstage cooling Technical measures to solve or alleviate the problems of increased unit power consumption, low volumetric efficiency and high final compression temperature caused by excessive compression ratio

[0003] When the heat demand of the user——the heated medium needs to be heated from a lower temperature to a higher temperature, whether it is a unit using single-stage compression or a unit using staged compression and inter-stage cooling, there are such defects: The condensation temperature corresponding to the pressure of the working medium of the unit at the end of compression must exceed the maximum temperature of the heated medium, that is, the final temperature of the heating. In this way, the heat of the low-temperature section of the heated medium must also be obtained by the highest heat supply of the unit. This will inevitably lead to a large heat transfer temperature difference of the unit, which will bring about a decrease in the performance index of the unit

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