Analysis of Thermodynamic Performance of Combined Cooling,Heating and Power System based on TC-CCES
To better understand the thermodynamic characteristic of carbon dioxide as energy storage working medium,the thermodynamic model of combined cooling,heating and power(CCHP)system was constructed by Aspen Plus software,combined with the easy liquefaction characteristics of carbon dioxide based on the transcritical compressed carbon dioxide energy storage(TC-CCES)system.The effects of hot water flow rate of regenerator,pressure drop of low-pressure throttle valve and outlet pressure of first stage compressor on the performance of CCES-CCHP system were analyzed.The results show that the e-lectrical efficiency of the CCES-CCHP system is 41％and the energy efficiency is 1.16 under the condi-tion of base case;when the hot water flow rate of regenerator and the outlet pressure of the first stage compressor change,the change trends of electric efficiency and energy efficiency of the system are oppo-site;when the pressure drop of low-pressure throttle valve increases,the electrical efficiency and energy efficiency of the system show a downward trend;compared with TC-CCES system,CCES-CCHP system improves energy utilization efficiency by 19.50％.
transcritical compressed carbon dioxide energy storage(TC-CCES)supercriticalcom-bined coolingheating and power(CCHP)numerical simulation
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