闭式内可逆回热布雷顿热电冷联产装置(火用)分析  

Exergy Analysis of a Closed Endoreversible Regenerative Brayton CCHP Plant

作　　者：杨博[1,2,3] 陈林根[1,2,3] 戈延林[1,2,3] 孙丰瑞[1,2,3] 

机构地区：[1]海军工程大学热科学与动力工程研究室,武汉430033 [2]海军工程大学舰船动力工程军队重点实验室,武汉430033 [3]海军工程大学动力工程学院,武汉430033

出　　处：《热力透平》2014年第2期134-138,共5页Thermal Turbine

基　　金：国家重点基础研究发展计划(973)项目(2012CB720405);国家自然科学基金(10905093)

摘　　要：应用有限时间热力学理论和方法建立了闭式内可逆回热布雷顿热电冷联产装置模型,导出了装置无量纲(火用)输出率和效率的解析式。通过数值计算分析了回热器热导率对(火用)输出率和(火用)效率的影响,发现存在临界压比,同时优化了压比,研究了热电比、制冷和供热温度等设计参数对最优(火用)输出率和(火用)效率以及相应最佳压比的影响,发现最优(火用)输出率时的设计压比要大于最优(火用)效率时的设计压比,最优(火用)输出率和(火用)效率均随冷用户温度的升高而减小,分别存在最佳的热用户温度使(火用)输出率和(火用)效率取得最大值,热用户温度对装置最优(火用)性能的影响比冷用户温度更为明显。A closed endoreversible regenerative Brayton CCHP （combined cooling, heating and power） plant is established using finite time thermodynamics （FTT）. The analytical formulae about dimensionless exergy output rate and exergy efficiency are derived. Through numerical calculations, the effects of the regenerator＇s heat conductance on exergy output rate and exergy efficiency are analyzed meanwhile, the pressure ratio is optimized. Then the influences of design parameters （such as the heat to power ratio, the cooling and thermal consumer temperatures, et al. ） on the optimal exergy output rate and exergy efficiency, and the corresponding optimal pressure ratios are investigated. It is found that the design pressure ratio corresponding to optimal exergy output rate is larger than that of optimal exergy efficiency. The optimal exergy output rate and exergy efficiency decrease with the increase of cooing consumer temperature. There exist two optimal thermal consumer temperatures which enable exergy output rate and exergy efficiency reaching maxima, respectively. The effect of thermal consumer temperature on the optimaI exergy performances of the plant is more obvious than that of cooing consumer temoerature.

关 键 词：有限时间热力学 闭式内可逆回热布雷顿热电冷联产装置 (火用)输出率 (火用)效率 压比 

分 类 号：TK471[动力工程及工程热物理—动力机械及工程]