Energy and exergy analysis of a micro CCHP system based on SOFC/MGT/ORC and steam ejector refrigeration cycle

Abstract: This paper proposes a Micro CCHP system for combined production of cooling heating and power. The CCHP system includes a Solid Oxide Fuel Cell(SOFC), a Micro Gas Turbine(MGT), an Organic Rankine Cycle(ORC), a Steam Ejector Refrigeration cycle (SER), heat recovery equipment and other relevant components. The energy-exergy analysis is conducted to thermodynamically investigate on system performances in summer and winter. In addition, a parametric study is presented to observe the effects of some operating parameters such as the fuel flow rate, steam to carbon ratio and the mass flow rate of ORC on the evaluation criteria of the system and its components. Results show that under the design conditions the system exergy efficiency is 64.39% in summer while at the same time the overall energy efficiency can reach 91.21% which is 11.78% higher than that in winter. The mass flow rate of ORC and the entrainment ratio of the ejector both have big impacts on improving the cooling capacity of the Micro CCHP system.

Keywords: micro CCHP, solid oxide fuel cell, micro gas turbine, organic rankine cycle, thermodynamic analysis

 
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