A large temperature span high temperature heat pump system

Abstract

A heat pump system with a large temperature span and a high temperature includes a low-pressure stage compression subsystem, a first high-pressure stage condensing temperature system, and a second high-pressure stage condensing temperature system. The low-pressure stage compression subsystem includes a first compressor, a gas-liquid separator, a first Throttling parts, evaporator, first regenerator, third regenerator, second regenerator, first high-pressure stage condensation temperature system includes second compressor, first condenser, third regenerator and second regenerator Two throttling parts, the second high-pressure stage condensing temperature system includes a third compressor, a second condenser, a second regenerator and a third throttling part. Use the high and low pressure two-stage compression method to solve the problem of low heating efficiency caused by the large single-stage compression compression ratio of high-temperature heat pumps, and use the double condensing temperature of the high-pressure stage parallel method to solve the problem of large-temperature span heating. The heating performance of the heat pump system achieves the purpose of saving high-grade electric energy. Combined with heat recovery technology, the system makes full use of low-grade heat energy and reduces the energy consumption of the compressor.

Description

technical field [0001] The invention belongs to the technical field of heat pumps, and in particular relates to a large temperature span and high temperature heat pump system. Background technique [0002] High-temperature heat pump technology is a technology that converts low-grade heat energy such as solar energy, industrial waste heat, or groundwater into high-temperature hot water or steam at about 120°C. Due to the high condensation temperature and the large temperature difference between the condensation temperature and the evaporation temperature, the traditional single-stage compression heat pump cycle has the characteristics of high compressor compression ratio, low compressor volumetric efficiency, and low unit performance. In the two-stage compression intermediate incomplete cooling cycle, the low-pressure refrigerant vapor generated in the evaporator is first sucked into the low-pressure compressor for adiabatic compression to the intermediate pressure of the sys...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a high-temperature heat pump system with a large temperature span. The system uses a high-pressure and low-pressure two-stage compression method to solve the problem of low heating efficiency caused by a high compression ratio of a single-stage compression in a high-temperature heat pump. The dual condensing temperature solves the problem of large temperature span heating. By constructing the cascade heating heat pump cycle, the heating performance of the heat pump system is improved to achieve the purpose of saving high-grade electric energy. Combined with the heat recovery technology, the system makes full use of low-grade heat energy. At the same time reduce the energy consumption of the compressor

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