带压缩空气储能的冷热电联产系统的

对一种带压缩空气储能的冷热电联产系统进行了热力学(火用)分析,得到了各主要部件和整个系统的(火用)损失及(火用)效率的变化规律.分析结果表明空气透平绝热效率的提高对系统(火用)效率的贡献大于压缩机效率同样提高的功效;在其它参数确定时,存在最佳压比,可使系统的(火用)效率在该条件下达极值;高温换热器是新型冷热电联产系统中产生(火用)损失的主要部件,而循环水量的大小是影响高温换热器(火用)效率的主要因素.

Exergy Analysis of aCogeneration System with Compressed-air Energy Storage for the Simultaneous Supply ofElectric Power, Heat and Cooling Energy

A thermodynamic exergy analysis was performed for a cogeneration system with compressed-air energy storage for the supply of electricity,heat and cooling energy.As a result,obtained were the exergy losses of various major components and the system as a whole as well as the law governing the change of exergy efficiency.The results of the analysis indicate that an increase in adiabatic efficiency of an air turbine can contribute more to an increase in system exergy efficiency than the same increase in efficiency of a compressor.When other parameters have been fixed,there exists an optimum pressure ratio,under which the exergy efficiency of the system can reach a maximum value.A high-temperature heat exchanger represents a major component causing exergy losses in a new type of cogeneration system for the simultaneous production of electricity,heat and cooling energy while the magnitude of circulating water quantity is a major factor influencing the exergy efficiency of the high-temperature heat exchanger.