Selection Of Refrigerant In The Two-stage Compressionair Conditioning/Heat Pump Hot Water System

With the production and people's daily lives, refrigeration, heating and domestic hotwater requirements gradual generalization, part of the whole building energyconsumption ratio also will be a corresponding increase in, so a more energy-efficientair conditioning heat pump system is particularly important. In practical applications,currently available multi-function air-conditioning heat pump hot water system is intoeveryone's life, but existing refrigeration heat pump systems are prevalent in the lowercold heat efficiency, functionality is not perfect, cold heat mutual restraint other issues,but this paper is to study the cold, in the form of a two-stage compression refrigerationsystem heat pump cycle can be adjusted independently, while cooling and heating willbe able to better address this issue, the article will be in the form of the systemscreening of the refrigerant, the refrigerant choice theory provides support for thefuture use of the system in the form of promotion.By studying of the two-stage compression heat pump refrigeration system, thispaper presents a calculation method of the system in the form of heat, and the use oftwo REFPROP and MATLAB simulation software for programming, and the resultswere analyzed. Based on the principles of environmental protection and naturalrefrigerants good prospects for development, the paper choice, and these five naturalrefrigerants as a refrigerant, its circulation system in this paper a theoretical calculationof the coefficient of performance of the system, characterized by intermediateComparative analysis of temperature, high-pressure compressor discharge temperatureand volume than other performance parameters. The results showed that: therefrigerant flow ratio, the outdoor air temperature, domestic hot water outlet temperature, chilled water outlet temperature is the main factor affecting itsperformance. Requirements under different focus, the merits of the order of fiverefrigerants differ, refer to the actual selection of the conclusions of this article.