Techno-economic-environmental performance of multi-stage evaporation based poly-generation system under multiple energy supply scenarios

Abstract

To fulfil the seasonal energy demand in buildings, a novel thermally-driven poly-generation system is proposed based on organic Rankine cycle (ORC) and two-stage vapor compression cycle (TSVCC). The thermodynamic model of the combined cooling, heating and power (CCHP) system was constructed based on the laws of thermodynamics and energy-supply scenarios were also analyzed. Techno-economic-environmental performance of CCHP system was analyzed and compared with the traditional standalone energy-supply modes. Results show that the heating capacity of novel poly-generation system is at least 11% higher than single heating system. For the power generation performance, the novel poly-generation system is almost the same with the traditional ORC. The cooling capacity of poly-generation system is 8% worse than absorption refrigeration system due to the relatively low efficiency of ORC. The poly-generation system can meet the seasonal demand in buildings, the overall performance becomes more attractive with a rising heat source temperature, optimal operating parameters and proper working fluid. The net power output is 3199.37 kW and payback period will lower than 3 years if the heat source temperature is 473.15 K and R1233zd as the working fluid. Therefore, the proposed poly-generation system is excellent and should be employed in engineering applications.