Sectionalized heat absorption, sectionalized compression and sectionalized expansion gas compression type heat pump

Abstract

The invention relates to a sectionalized heat absorption, sectionalized compression, sectionalized expansion gas compression type heat pump, belonging to the field of heap pumps or refrigeration. Aiming at avoiding the defects of a machine seat with a single evaporator during large variation ranges of waste heat and medium temperature, the invention provides a gas compression type machine set which comprises more than two compressors, more than two expanders, more than two evaporators, a heater, and the like and realizes sectionalized heat absorption, sectionalized compression and sectionalized expansion, wherein a first compressor, a heat supply device, a first expander and a first heat exchanger form a first section of gas compression type heat pump structure which utilizes higher-temperature waste heat and a technological process; a second compressor, a second supply device, a second expander and a second heat exchanger form a second section of gas compression type heat pump structure which utilizes low-temperature waste heat and a technological process, by parity of reasoning; and a heat regeneration machine set can be formed by additionally providing a heat regenerator. The invention reduces the heat transfer temperature difference and increases the performance index; the heat pump used on the occasion with large ranges of waste heat and medium temperature can increase the utilization rate of the waste heat; and when used as a refrigerating machine within large temperature range of refrigerated media, the invention can reduce the power consumption.

Description

Technical field: [0001] The invention belongs to the technical field of heat pump / refrigeration. Background technique: [0002] Gas 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 gas compression unit is mainly composed of basic components such as a compressor, a heater, an expander, and a low-temperature heat exchanger. of heating. When the parameters of the heated medium (mainly temperature) are determined, the smaller the amount of waste heat resources, the greater the temperature range of the waste heat medium, and the lower the temperature requirements of the refrigerant medium after it is decompressed and expanded by the expander. The greater the heat transfer temperature difference with the refrigerant medium, the greater the compression ratio of the compressor, and the lower the performance index of the unit. [0003] When used for refrigera...

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Problems solved by technology

[0003] When used for refrigeration, in order to take away the heat in the refrigerated medium, the temperature of the refrigerant medium after being depressurized and expanded by the expander must be lower than the minimum temperature of the refrigerated medium; when it is necessary to lower the refrigerated medium from a higher temperature When the temperature is lower, the use of a single low-temperature heat exchanger to obtain heat also encounters the problems of large compression ratio of the compressor and low performance index of the unit

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