Design and Modelling of a Novel Compact Power Cycle for Low Temperature Heat Sources
Design and Modelling of a Novel Compact Power Cycle for Low Temperature Heat Sources
复制标题
低温热源新型紧凑动力循环的设计和建模
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
F. Haglind
中科院分区：
文献类型：
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作者：
J. Wronski;M. Skovrup;B. Elmegaard;Harald Nes Rislå;F. Haglind
有效利用低温热源的动力循环受到越来越多的关注。本文介绍了一种替代循环设计，提供了潜在的优势，在热源开发。提出了一种用于往复式膨胀机的概念，其执行功提取和热添加两者。通过热油加热，蒸发发生在两个膨胀室中，工作流体在中间压力水平下转移。使用饱和液体作为进料导致两相域中的膨胀。该膨胀机的动态模型用于确定过程期间工作流体的状态。在此模型的基础上，通过改变气门正时进行了第一次优化，并在本文中显示了这种情况下的结果。膨胀过程中的热传递进行了研究，并用于建立一个代表性的动态计算结果与稳态循环评价使用。开发了有机朗肯循环模型并用于比较。研究了膨胀机本身的性能以及对热源和温度水平的不同要求。
Power cycles for the efficient use of low temperature heat sources experience increasing attention. This paper describes an alternative cycle design that offers potential advantages in terms of heat source exploitation. A concept for a reciprocating expander is presented that performs both, work extraction and heat addition. Heated by thermal oil, evaporation takes place in two expansion chambers with a transfer of the working fluid at an intermediate pressure level. Using saturated liquid as feed leads to an expansion in the two-phase domain. A dynamic model of this expander is used to determine the state of the working fluid during the process. Based on this model, a first optimisation by means of changed valve timing is conducted and the results of this scenario are shown in this paper. The heat transfer during expansion is investigated and used to establish a representation of the dynamic calculation results for use with a steady state cycle evaluation. An organic Rankine cycle model is developed and used for a comparison. The performance of the expander itself and the different requirements regarding heat source and temperature levels are studied.