Non-azeotropic mixed working medium heat pump air-conditioning system with concentration adjustable

Abstract

The invention discloses a non-azeotropic mixed working medium heat pump air-conditioning system with the concentration adjustable in a variable condenser and a variable evaporator. The non-azeotropic mixed working medium heat pump air-conditioning system comprises a normal concentration circuit, a variable condenser concentration bypass and a variable evaporator concentration bypass. The normal concentration circuit comprises a compressor, the condenser, a supercooler, a throttling device, a main gas-liquid separator and an evaporator. The variable condenser concentration bypass comprises an auxiliary gas-liquid separator and regulating valves. The variable evaporator concentration bypass comprises the main gas-liquid separator, the supercooler and regulating valves. According to the non-azeotropic mixed working medium heat pump air-conditioning system with the concentration adjustable in the variable condenser and the variable evaporator, the energy efficiency of the heat pump air-conditioning system can be further improved on a given working condition; the concentration of a mixed working medium in the condenser is firstly changed, then the concentration of a mixed working medium in the evaporator is changed, good temperature matching can be generated in the condenser and the evaporator on variable working conditions, and the relatively high energy efficiency of the heat pump air-conditioning system can be guaranteed; and the structure is simple, operation is convenient, modification cost is low, and the concentration of the mixed working medium in the condenser and the concentration of the mixed working medium in the evaporator can be independently regulated by controlling the opening-closing and the opening degree of the additionally arranged regulating valves.

Description

technical field [0001] The invention relates to the technical field of heat pump air conditioning and refrigeration, in particular to a non-azeotropic mixed working medium heat pump air conditioning system with adjustable concentration. Background technique [0002] Due to the temperature change of the heat exchange fluid during the heat exchange process, while the temperature of the pure substance during the evaporation and condensation process is constant (ignoring the pressure drop during the heat exchange process), it is difficult to connect the evaporator and the condenser. Better temperature matching is achieved, i.e. irreversible losses due to heat transfer increase, resulting in lower energy efficiency of the system. Compared with pure refrigerants, mixed refrigerants can complement each other's advantages, especially the unique temperature glide characteristics of non-azeotropic refrigerants, which can approximate the Lorentz cycle and solve the problems of pure ref...

AI Technical Summary

Problems solved by technology

However, the irreversible losses caused by heat transfer in each of the two heat exchangers in this system are not all minimal

Especially when there is a large difference in operating temperature difference between the low-temperature heat source and the high-temperature heat source, it is difficult to achieve the optimum temperature matching between the heat exchange fluid in the condenser and the evaporator at the same time

At the same time, the conventional heat pump air conditioning circulation system is also difficult to maintain efficient operation under variable working conditions

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