Sectional evaporation-compression vapor compression heat pump

Abstract

The invention provides a sectional evaporation-compression vapor compression heat pump, belonging to the technical field of residual-heat utilization and heat pump / refrigeration. The vapor compression heat pump aims at overcoming the defects of a vapor compressor provided with a single evaporator when a residual-heat medium has large temperature variation range, and provides a vapor compression machine set which comprises more than two compressors, more than two evaporators, a condenser, a throttle valve and the like and realizes sectional evaporation-compression; low temperature section evaporation-compression can be realized by the low temperature evaporator and the first compressor; high temperature section evaporation-compression can be realized by the high temperature evaporator and the second compressor; the residual-heat medium firstly flows through heating refrigerant liquid of the high temperature evaporator to become refrigerant vapor to be provided for the second compressor, and then flows through heating refrigerant liquid of the low temperature evaporator to become refrigerant vapor to be provided for the first compressor after the temperature is lowered, the first compressor provides the refrigerant vapor for the condenser or the second compressor; and the heat of the heated medium is absorbed by the condenser when the medium flows through the condenser. The sectional evaporation-compression vapor compression heat pump reduces residual-heat transmission temperature difference, improves the performance index of the machine set, and can reduce the power consumption of the machine set when the residual-heat medium has large temperature variation range.

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. Vapor compression heat pumps are mainly composed of basic components such as compressors, condensers, throttle valves, and evaporators. The waste heat is obtained mainly by the vaporization and heat absorption of the working fluid in the evaporator. In the case of relatively few waste heat resources, the temperature drop of the waste heat medium will be large. At this time, if a vapor compression heat pump with a single evaporator is used, problems such as high compression ratio, low volumetric efficiency, and reduced performance index of the unit will be caused. . In order to improve the performance index of the unit, the technical measures of s...

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Problems solved by technology

[0004] Therefore, when the waste heat resource—that is, the refrigerated medium—is relatively small, the temperature range is large, and the total load of waste heat utilization is large, the vapor compression heat pump unit with a single evaporator corresponding to a single compressor has a relatively simple structure. , but the performance index of the unit is low, and the waste heat utilization rate is not high; the vapor compression heat pump unit with a single evaporator staged compression and interstage cooling still cannot effectively solve this problem

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