辐射对流传热对不可逆太阳能Braysson热机性能的影响  

THE EFFECT OF RADIATION AND CONVECTION HEAT TRANSFERS ON THE PERFORMANCE OF AN IRREVERSIBLE SOLAR-DRIVEN BRAYSSON HEAT ENGINE

作　　者：林国星[1] 吴兰梅[1] 

机构地区：[1]厦门大学物理系理论物理与天体物理研究所,福建厦门361005

出　　处：《工程热物理学报》2008年第8期1277-1279,共3页Journal of Engineering Thermophysics

基　　金：福建省自然科学基金资助(No.2007J0210)

摘　　要：建立高温端同时辐射对流传热、低温端对流传热的不可逆太阳能Braysson热机循环新模型,探索有限速率热传导和绝热过程不可逆性等对热机循环性能的影响,基于热力学分析方法,导出热机输出功率和效率的解析表达式,数值计算结果揭示了等压温比、内不可逆参量及与热传导系数和面积有关的匹配参量等对热机性能特性的影响,所得结论不仅能导出其它不可逆太阳能热机的优化性能,且可为太阳能热机的参数设计和性能评价提供新理论参考。A new cycle model of irreversible solar-driven Braysson heat engine was established,in which finite rate heat transfer,with radiation and convection mode from the hot reservoir to the heat engine and convection mode from the heat engine to the cold reservoir,and irreversible adiabatic processes were taken into account.The analytic expressions of the power output and efficiency of the heat engine were derived by means of thermodynamic analysis method.On the basis of numerical value approach,influences of the...

关 键 词：太阳能热机 辐射 对流 热传导 优化性能 

分 类 号：TK123[动力工程及工程热物理—工程热物理]