Thermal Performance and Applicability Analysis of Air Compression Refrigeration System Used in Ultra-Low Energy Buildings

Abstract

The use of environmentally friendly refrigerants can effectively solve the problem of ozone layer depletion and slow down global warming. In this paper, a compression refrigeration system using air as refrigerant was proposed and applied to ultra-low energy buildings. The air compression refrigeration system was simulated by MATLAB and its performance was verified. Ultra-low energy buildings (ULEBs) were modeled using DeST for calculation, and the cooling and heating loads in different climatic zones of China were obtained and analyzed for their applicability. The results show that when the pressure ratio is 1.8, the heating COP of the system is 1.55. In addition, the system has strong applicability in ULEB, performs well in low-temperature heating, can meet the cold and hot load requirements of buildings, and has better operational performance in cold regions. This study provides a theoretical basis for the application of air compression systems in ultra-low energy buildings.

Keywords: Air compression system, Building load, Ultra-low energy buildings