Analysis And Optimization Of Energyefficiency Of Temperature Alternating Systemand Components

At present,alternate temperature system(ATS)is widely used in automobile,electronics,new energy,material synthesis,military industry and laboratories of various scientific research institutions.High and low temperature test chamber is a typical application of ATS,with common temperature range from +100℃~-60℃.In this paper,the energy efficiency and optimization method of an ATS are analyzed.The main work and conclusions are as follows.(1)The heat load of refrigerant bypass method and cold storage method is calculated.The effect of the heat generation and heat capacity of the object to be tested on energy consumption of refrigerant bypass method is analyzed.The influence of energy saving effect of the heat generation is investigated,and the energy consumption with different circulating air velocity is discussed.The results indicate that cold storage design can apparently reduce the energy consumption and the compressor size whether the design is based on single compressor or double compressor.(2)Steady state design and dynamic heat load calculation for an ice storage type ATS are carried out.Without subcooling in the refrigeration device,the influence of the heat generation and heat capacity of the object,constant temperature duration,evaporation temperature during storage,and cooler working temperature on the energy saving effect is analyzed.The effects of different discharge temperature and cooling air velocity on the circulating water flow rate are compared.Besides,the effect of the subrcooling degree on the energy saving effect and the compressor size is calculated.The results indicate that with subcooling,the energy consumption and the compressor size are reduced.(3)Numerical simulation of an axial flow fan in an ATS is carried out and the simulation results are validated by experiments.The aerodynamic performance of the fan with different structure,rotating speed and air temperature is simulated.The simulation results show that the performance is improved significantly by incorporating diffuser at the outlet of the fan.High air temperature is detrimental for the fan’s performance.In this paper,the energy consumption of the ATS is reduced and its components is optimized,which has guiding significance for improving the performance of the ATS in real equipment.