Optimization on Operating Parameters of a Small-Scale CCHP System Based on Economic- Energy Efficiency

Special Issues Editor (Nottingham Tent University, United Kingdom (Great Britain))

A small-scale combined cooling, heating and power (CCHP) system with a novel NH3/LiNO3/He diffusion absorption refrigeration (DAR) is proposed and the performance of the CCHP system is simulated and analyzed. The results based on using economic-exergy efficiency (ηecex) as the evaluation criterion show that the economic-exergy performance of the CCHP system is mainly affected by the inlet temperature (Texpa, inlet) and inlet pressure (Pexpa, inlet) of screw expander, the temperature difference of the generator of DAR (∆Tgene) and the solution recirculation ratio (rr) of DAR system. However, in those mentioned parameters, the influence characteristics on economic-exergy performance are not exactly the same due to the different effects of the working conditions. Genetic algorithm (GA) is employed to achieve the highest economic-exergy efficiency in the optimization of the system operating in "following the electricity loads" mode. The optimization result indicates that, within the range of decision variables, the economic-exergy efficiency can achieve 23.08% when the four key parameters, namely screw expander inlet temperature, screw expander inlet pressure, temperature difference of the generator of DAR and solution recirculation ratio are 179.95oC, 693.68kPa, 5.03oC, 0.699, respectively.

Journal: International Journal of Simulation: Systems, Science & Technology, IJSSST V17

Published: Jul 14, 2016

DOI: 10.5013/IJSSST.a.17.26.03