Thermodynamic Software Analysis of Transcritical CO_2 Refrigeration System Used For Simultaneous Heating and Cooling Application

摘要

This paper briefly explains about thermodynamic and software analysis of Transcritical CO_2 refrigeration system used for simultaneous heating and cooling application. 1st each component is modelled thermodynamically and then analysis is carried out by manipulating each parameter while other parameters are kept constant. Same analysis is done using software to validate the results. Analysis consists of finding the effect of change in parameter on COP of system. And study is carried out to find why this happens. The parameters varied during this analysis are Gas Cooler pressure, gas cooler outlet temperature, evaporator temperature, during analysis gas cooler pressure is varied from 80 bars to 130 bars, Evaporator temperature is varied from -15°C to 15°C and gas cooler outlet temperature is varied from 35°C to 55°C. During analysis highest COP is find out to be 7.85. It was also observed that the cycle is suitable for air-conditioning application rather than refrigeration cycle, COP increases when the evaporator temperature increases. As we know that CO_2 is having low Critical temperature and pressure we are able to operate it supercritical and subcritical state but this conditions offers some hurdles in system working as CO_2 system is working above critical point the pressure and temperature are independent so we have to maintain optimum pressure to get maximum COP.