Optimization And Performance Analysis Of Hybrid Solar Cchp System

To reduce the consumption of fossil fuel,a hybrid combined cooling,heating and power（CCHP）system with the utilization of solar energy,which includes PV system and evacuated tube collector（ETC）system,is designed.The thermal efficiency of ETC,photovoltaic efficiency,and the hourly electric,cooling and heating equilibrium of hybrid CCHP system are established.And Genetic Algorithm is employed to optimize the rated electric capacity of gas engine,E_nom,and the ratio of PV array area to the global solar energy system installation area,?_pv,to achieve the maximum integrated performance of hybrid CCHP system,which includes primary fossil energy saving,carbon dioxide emission reduction and annual total cost saving.A commercial building in Shanghai is selected to compare the multiple benefits of hybrid CCHP system with respect to CCHP system and SP system as the references under three different operation strategies as follows:following the electric load（FEL）,following the thermal load（FTL）,and following the hybrid electric-thermal load（FHL）.Besides,these benefits include primary energy consumption structure,annual operation condition of gas engine,CO₂,SO₂ and PM2.5 emission reduction,initial investment,net present value,and payback period.The results indicate that hybrid CCHP system yields better integrated performance than typical CCHP system and SP system.And the hybrid CCHP system under FEL operation strategy achieve the best energy,environmental and economic benefits,followed by FTL and FHL operation strategies,respectively.But hybrid CCHP system has a higher initial investment cost and longer payback period than typical CCHP system,because of its higher installation cost of solar energy system.Besides,the influences of the ratio of electric cooling to total cooling load,?_ec,climate condition,electricity tariff models,energy price and criteria weight on the optimal system design and performance of hybrid CCHP system are also analyzed.The results indicate that the maximum integrated performance of hybrid CCHP system can be achieved with the optimal?_ec and?_pv.And the hybrid CCHP system with FEL operation strategy under the time of use tariff model,yields better economic benefit than the single use tariff model.But the hybrid CCHP system with FTL and FHL operation strategies under the single use tariff model,yields better economic benefit than the time of use tariff model.And when assumed the same electricity and gas price,the hybrid CCHP system employed in the same commercial building in Beijing yields highest integrated performance,followed by the one in Shanghai and Guangzhou,respectively.Besides,there are little differences among the energy,environmental and economic benefits of hybrid CCHP system under three different multiple criteria.However,when the single criteria,such as energy,environmental and economic criteria,is considered,the change of other criteria is relatively large.