Energetic and exergetic analysis of integrated energy system based on parametric method

Investigating the relationship between the performance of an integrated energy system (IES) and each influencing factor as well as directly calculating IES efficiency based on relevant parameters are of substantial importance to energy saving. To make the research results applicable to various IES, a typical integrated energy system (TIES) which includes typical energy conversion technologies is proposed. After building energy demands and energy conversion processes in TIES are abstracted and simplified by a typical energy flow map, a dimensionless equation for calculating TIES energy and exergy efficiency is developed. Based on the partial derivatives analysis of TIES's energy and exergy efficiency dimensionless equation, the effects of technological level, demand structure, local renewable energy utilization and IES configuration on energy and exergy efficiency are clarified. Combined with a case study, the usability of the parameter analysis method for IES has been illustrated. The departure phenomenon of energetic and exergetic analysis results in IES are also introduced. Furtherly, we indicate that without proper definition of benchmark environment, it is easy to give perplexing results with an exergetic analysis about IES.