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出 处:《机械工程学报》2006年第2期12-17,共6页Journal of Mechanical Engineering
基 金:国家973计划基金(G200026301)全国优秀博士学位论文作者专项基金(200136)海军工程大学科研基金(HGDJJ04018)资助项目
摘 要:建立了考虑泵热空间到环境的热漏、工质循环的内部不可逆性以及工质和热源之间传热遵守Qoc△(Tn)传热规律时的不可逆四温位吸收式热变换器循环模型,导出了循环泵热率和泵热系数的一般关系:并导出了线性唯象传热定律时循环泵热率和泵热系数的基本优化关系、性能极值、循环中工质的最佳工作温度和换热器传热面积的最佳分配关系;通过数值算例分析了传热规律、热漏和内不可逆性对循环性能的影响规律,比较了传热面积最优分配前后循环的最优性能。An irreversible four-heat-temperature absorption heat-transformer cycle model is established by taking account of the heat leakage, internal irreversibilities and heat resistances between working substance and heat reservoirs with heat transfer law of Q∝△(T^n). The general relation between the heating load and COP (coefficient of performance) with Q∝△(T^n) is deduced. The fundamental optimal relation, the maximum heating load, the maximum COP, the optimal temperatures of working substance, as well as the optimal heat transfer surface areas distribution with linear phenomenological heat transfer law are derived. Moreover, effects of heat transfer law, heat leak and internal irreversibilities on the performance of absorption heat-transformers are analyzed, and the performance comparison is performed for the distribution of the total heat transfer surface area is optimized or not by numerical example.
关 键 词:吸收式热变换器 传热规律 热漏 内不可逆性 最优性能
分 类 号:TK123[动力工程及工程热物理—工程热物理]
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