Double-heat-source large-temperature-difference heat pump unit and heating method

Abstract

The invention discloses a double-heat-source large-temperature-difference heat pump unit and a heating method. The double-heat-source large-temperature-difference heat pump unit comprises a compressor and a gas-liquid separator and further comprises a second user side heat exchanger, a distiller, a second throttling valve, a low-temperature evaporator and a high-temperature evaporator. The compressor sucks a gaseous refrigerant and carries out compression output. An outlet of the gas-liquid separator is connected with a gas suction port of the compressor. The second user side heat exchanger is connected with an exhaust port of the compressor and used for condensing a high-boiling-point component in a mixed refrigerant. The distiller is used for separating a gas-liquid two-phase refrigerant at a refrigerant outlet of the second user side heat exchanger. An inlet of the second throttling valve is connected with a refrigerant outlet of a first user side heat exchanger. An inlet of the low-temperature evaporator is connected with an outlet of the second throttling valve and used for evaporation heat exchange of a refrigerant rich in low-boiling-point component. An inlet of the high-temperature evaporator is connected with an outlet of a first throttling valve and used for evaporation heat exchange of a liquid-state refrigerant rich in high-boiling-point component. Two different components at a high boiling point and a low boiling point in high-temperature high-pressure non-azeotropic mixed refrigerant gas carry out condensation heat release in two condensers at different dew point temperatures, and secondary side large-temperature-difference heat exchange is achieved.

Description

technical field [0001] The invention belongs to the technical field of refrigeration, air conditioning and heat pumps, in particular to a dual heat source large temperature difference heat pump unit and a dual heat source large temperature difference heat pump heating method using non-azeotropic mixed working medium to provide dual low temperature heat sources and secondary side large temperature difference heat exchange . Background technique [0002] In recent years, with the increasing maturity of traditional heat pump technology, the demand for high-temperature hot water for industrial use is increasing day by day. However, traditional air source heat pumps have relatively high restrictions on the outlet water temperature. The difference between the condensation temperature and the evaporation temperature is generally 40-50°C. If High effluent or large difference in condensing and evaporating temperatures will lead to high condensing pressure and exhaust temperature, whi...

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Problems solved by technology

Although the invention has a certain ability to increase the working temperature difference as the load inc

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