A Circulation System of Gas Injection Enthalpy Increase Heat Pump Using Non-azeotropic Mixture with Subcooler

Abstract

The invention discloses an enhanced vapor injection heat pump circulating system with subcoolers adopting zeotrope. A compressor and a condenser are connected, and an outlet of the condenser is divided into two paths. One path is connected with the first subcooler through a first subcooler and a first expansion valve and then connected with a middle air nozzle of the compressor through the first subcooler. The other path is connected with an inlet of a second expansion valve through the second subcooler and the third subcooler, an outlet of the second expansion valve is connected with an inletof an evaporator, and an outlet of the evaporator is connected with a low-pressure inlet of the compressor through the third subcooler. According to the enhanced vapor injection heat pump circulatingsystem, the supercooling degree of refrigerating fluid in the inlet of the evaporator is improved through the multiple subcoolers, higher evaporation pressure is obtained at the same evaporation temperature, and therefore the pressure ratio of the compressor is reduced, the power consumption of the compressor is reduced, and the heating performance coefficient of the heat pump system is improved.

Description

technical field [0001] The invention belongs to the technical field of heat pumps, and in particular relates to a heat pump circulation system using a non-azeotropic mixture with a subcooler for increasing enthalpy by gas injection for a heat pump device. Background technique [0002] As an energy-saving heating technology, vapor compression air source heat pump technology is increasingly used in various types of heating, such as heat pump water heaters (apparatus) and heat pump air conditioners. With the development of my country's economy and the improvement of people's living standards, the development of air source heat pumps in my country is very rapid, and the research on related technologies is also constantly innovating. Among them, in order to improve the performance of air source heat pumps such as efficiency and heating capacity, especially in low temperature environments, the technology of air injection enthalpy increasing circulation system is an important devel...

AI Technical Summary

Problems solved by technology

However, non-azeotropic mixture refrigerants such as R600a / R290, R600a / CO 2 and R290 / CO 2 etc., since the non-azeotropic mixture refrigerant also has the gas-liquid phase composition shift characteristic, which makes the liquid rich in high-boiling point component mixture into the evaporator after passing through the flash evaporator, resulting in the evaporation pressure at the same evaporation temperature (ie Compressor suction pressure) is low, resulting in a large compressor pressure ratio and increased power consumption, which will also reduce the heating efficiency of the circulation system (that is, the cycle performance coefficient COP), thus restricting its practical application

On the other hand, the zeotropic mixture refrigerant is directly used in the existing gas-injection enthalpy-enhancing heat pump cycle system with a subcooler. Although there is no problem of being affected by the shifting characteristics of the gas-liquid phase composition, the existing system configuration type Failure to take full advantage of the phase change temperature glide characteristics of zeotropic mixture refrigerants, making it still insufficient in improving heat pump cycle efficiency

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