Based on the characteristics of internal combustion engine exhaust gas

a novel combined cooling

heating and power(CCHP) system is constructed to further recover the exhaust heat and achieve the purpose of energy saving and emission reduction. The CCHP system consists of a simple regenerative supercritical carbon dioxide(S-CO_2) Brayton cycle

an ejective refrigeration cycle and a hot water heat exchanger. The thermodynamic model of the proposed system is established to evaluate the system performance

and a comparative analysis is conducted between the single S-CO_2 cycle and the proposed CCHP system. In addition

parametric analysis is conducted to investigate the effects of three important operating parameters

including the compressor outlet pressure

turbine 1 inlet temperature and refrigeration evaporation temperature

on the system performance. Finally

multi-objective optimization is performed for the system when it generates the maximum cooling and power(CCP model) or simultaneously produces the maximum heat and power(CHP model). The results show that

in the CCP model

the sum of the system net output power

cooling capacity and heating capacity is 546.87 kW

the thermal efficiency and exergy efficiency of the system are 45.81% and 50.55%

respectively. While in CHP model

the corresponding indexes change into 501.35 kW

41.95% and 50.46%.