The exergy and energy level difference graphic analysis of a CCHP system under compressor inlet air throttling (IAT) operating strategy

The part-load performance of combined cooling, heating and power (CCHP) system based on exergy and energy level graphic analysis under compressor inlet air throttling (IAT) operating strategy is presented in this paper. The results show that the combustor (COMB) is found to have the largest exergy destruction followed by high-pressure generator (HPG). Compared with the reducing turbine inlet temperature (TIT) operating strategy, the exergy destruction of COMB is decreased under IAT operating strategy; however, the opposite result is presented in HPG. A new graphic analysis based on energy level difference is proposed to indicate the potential to enhance the thermodynamics performance of the components under different operating strategies. The decrease of the energy level difference in the COMB and HPG is a most positive way to decrease the exergy destruction with IAT and TIT operation strategies.