Performance Study Of Metal Capillary Network High Efficiency Radiation Air Conditioning System Based On CO₂ Refrigerant

With the development of the times,the problems of energy and environment are becoming more and more prominent.Energy saving and environmental protection have become two important directions in the development of science and technology.With the improvement of people's living standard,refrigeration,heating system has become an indispensable part of life.The effects of conventional refrigerants on the environment are mainly manifested in ozone layer destruction and the production of Greenhouse Effect.Based on these problems,this paper draws lessons from the low temperature differential heat absorption and exothermic principle of building energy saving and low carbon technology(water medium capillary net)in Germany,and puts forward a metal capillary net radiation air conditioning system based on CO2 refrigerant.Use of Natural Environmental refrigerant R744(CO2)Instead of the original water medium as the circulating medium of cold heat,the end of the metal capillary net in the room combines with the wall to form a huge radiative heat transfer surface,which makes the low temperature heating and high temperature cooling realized.The characteristics of CO2 refrigerant under different operating conditions are analyzed by Coolpack.The effects of evaporation temperature and condensation temperature on the performance of the system are studied by the method of controlling variables.By comparing and analyzing the compressor efficiency of 0.6 and 0.8,it is concluded that the cycle performance of the system can be improved by increasing the evaporation temperature,and the heat transfer effect of the evaporator can be enhanced by increasing the evaporation temperature.Try to use a higher temperature of freezing medium to achieve.Similarly,lowering the condensing temperature can improve the circulation performance of the system,enhance the heat transfer effect of the condenser,and use the lower temperature cooling medium as far as possible.The outlet temperature of the gas cooler is reduced.When the evaporation temperature is higher and the condensation temperature is lower,the cycle performance of the system increases with the increase of compressor efficiency.In the AMESim software environment,this paper simulates three variables of condensing temperature,evaporator inlet air temperature and compressor speed for winter working conditions;three variables of evaporating temperature,condenser inlet air temperature and compressor speed are selected in summer working conditions.simulation.The compressor has three operating modes:800 rpm,1000 rpm,and 1200 rpm.The effects of the six modes on system performance are simulated.The results show that in winter conditions,as the condensing temperature increases,the system heat decreases,the compressor power increases,and the system COP value decreases.The higher the compressor speed,the slower the system heating decreases,the faster the compressor power increases,and the slower the system COP value decreases.As the temperature of the inlet air of the evaporator increases,the heating capacity of the system also increases,the compressor power increases,and the system COP value also increases.In summer conditions,as the evaporation temperature increases,the system cooling capacity increases,the compressor power decreases,and the system EER value increases.As the condenser air inlet temperature increases,the system cooling capacity decreases,the compressor power increases,and the system EER value decreases.