| Combined cooling,heating and power(CCHP)system is widely regarded as an energy efficient system for its high energy efficiency,less pollution and cascade utilization of energy.However,its development is limited for mismatching between system supply and building demands.Energy storage is considered to be an effective way to adjust the difference and instability between energy supply and demands.Besides,under the background of global climate change and resources shortage,efficient energy supply and renewable energy intensive utilization have been hot issues of current research.Thus,In this paper,the thermal storage strategy for CCHP system based on variable loads was studied.Firstly,A CCHP system based on internal combustion engine is proposed.According to the residual heat of the internal combustion engine,thermal storage devices of exhaust gas and jacket water are designed and integrated.The thermodynamic model of each part of the system is established.Secondly,two different storage strategies are established according to two kinds of waste heat forms form the internal combustion engine.An office building in Beijing is selected as a case,the optimal storage strategy is established through the comprehensive comparison of the energy efficiency of system,excess products,fuel consumption and cold electricity radio under two kinds of storage strategies.Finally,a solar-assisted CCHP system with thermal storage is designed based on the optimal energy storage strategy.Using the multi-objective evaluation method and taking the traditional supply system as the reference object,an evaluation index is established based on three aspects of energy efficiency,environment and economy.As for an office building in Beijing in summer,Setting energy,en vironment,economic and comprehensive benefits of the relatively subsupplier system of CCHP system to the maximize as the goal respectively,the equipment capacity and operation mode of cogeneration system for solar heat are optimized. |
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