Thermoeconomic evaluation for integration of hybrid energy supply system with renewable energy based on exergy analysis

摘要

A greybox model analysis is applied to hybrid energy supply system integrated with renewable energy based on gas turbines in combined cooling,heating and power generation(CCHP).In comparison with conventional power grid and heat supply network system,it is deeply revealing of weak links of traditional system in thermodynamic degree of perfection.Simultaneously,integration of hybrid energy supply system with renewable energy is high efficiency in heat cascade utilization.Such as exergy analysis and thermoeconomics are actualized,the methods are that hybrid energy supply system is separated into several units,and then these units are set up exergy balance equations.Firstly,the units are analyzed by exergy respectively,and then overall system is discussed by exergy as well.Secondly,the minimum of annualized product cost of energy system is for optimization objective,which set up exergy cost equation in accordance with exergy economic model.Finally,the unit exergy cost is calculated for evaluation index.The results show that total energy and exergy efficiency of hybrid energy supply system integrated with ground source heat pump system(GSHP)are 22％and 33％higher than conventional system respectively,and the unit heat and heat exergy cost of hybrid energy supply system are 30％and 20％lower than conventional system respectively.In comparison with traditional the conventional system,hybrid energy supply system has an advantage in economic terms.Simultaneously,it is confirmed that both the exergy loss and unit exergy cost are increased in the process of energy transfer.