Abstract
Abstract An efficient innovative combined cooling, heating and power (CCHP) system driven by solar energy with thermal energy storage is proposed and investigated. The system is a modified configuration of Rankine and ejector refrigeration cycles, integrated in such a way that it can operate on complete CHP or CCP modes by regulating the extracted mass flow ratio from the power turbine. Another interesting feature is employment of environmentally-friendly working fluids, namely CO2 and N2O. To enhance the system performance booster compressor is employed in refrigeration loop to increase the cooling production and thermoelectric generators are used to recover some part of the cycle waste heat. Feasibility analysis, parametric investigation and multi-objective thermoeconomic optimization are conducted to examine the system performance at all the range of practical operating/design conditions. The results indicated better performance of N2O compared to CO2 as the working fluid in terms of power generation, exergy efficiency and L C O E for all the operating conditions. Under the optimal operation obtained by multi-criteria optimization, thermal efficiency and L C O C H E values, respectively are 40.32% and 15.32 $/GJ for N2O working fluid. In addition, a comparison with similar previously proposed CCHP systems has indicated superiority of present CCHP system at the similar operating conditions.
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