In the view of the defects of the traditional absorption combined cooling

heating and power system(CCHP) system

such as low refrigeration capacity and low refrigeration efficiency

a new absorption-ejector CCHP system is developed using CO_2-[emim][Tf2 N] based on the energy cascade utilization and principle of recycle refrigeration.The steady-state conditions of the system are fixed

the corresponding working principle of the CCHP system is elaborated

the thermodynamic model of the system is set up and the influence of the key thermodynamic parameters on the system performance is evaluated by using the thermal efficiency ηthm and the exergy efficiency ηexg.The results show that the increasing the evaporation temperature of the system and the pressure of the high pressure side of the system can effectively improve the system performance.ηthm and ηexg have the upgrade trend when evaporation temperature ranges from 3 ℃ to 8 ℃.ηexg increases from 0.37 to 0.44 when the pressure of the high pressure side ranges 9 MPa to 12 MPa.However

when the pressure of expander increases

the system performance shows a downward trend.ηthm decreases from 0.47 to 0.39 and ηexg decreases from 0.47 to 0.43 when the pressure of expander ranges from 7.4 MPa to 9.0 MPa.Besides

under the given simulated conditions

the Ccopof the CCHP with ejector is higher than that of the traditional CCHP with no-ejector.