Thermodynamic analysis of high-temperature regenerative organic Rankine cycles using siloxanes as working fluids
Thermodynamic analysis of high-temperature regenerative organic Rankine cycles using siloxanes as working fluids
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DOI：
10.1016/j.energy.2011.06.028
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发表时间：
2011-08
期刊：
影响因子：
9
通讯作者：
F. J. Fernandez;M. M. Prieto-M.;I. Suarez
中科院分区：
文献类型：
--
作者：
F. J. Fernandez;M. M. Prieto-M.;I. Suarez
最近对用作高温有机朗肯循环中的工作流体的硅氧烷的斯潘-瓦格纳状态方程进行了新颖的调整，应用于数学模型中以求解多种工作条件下的循环。所提出的方案包括热源和有机朗肯循环之间的热油中间热回路。线性和环状硅氧烷在饱和、过热和超临界循环中进行分析。该循环包括内部热交换器（再生循环），但也解决了非再生方案。在研究的第一部分中，将冷却至接近露点温度的燃烧气体流作为参考热源。在第二部分中，热源的出口温度在很大范围内变化，为每个热水平确定合适的流体和方案。饱和再生方案中的简单线性（MM、MDM）硅氧烷表现出良好的效率并确保工作流体的热稳定性。
A recent novel adjustment of the Span–Wagner equation of state for siloxanes, used as working fluids in high-temperature organic Rankine cycles, is applied in a mathematical model to solve cycles under several working conditions. The proposed scheme includes a thermo-oil intermediate heat circuit between the heat source and the organic Rankine cycle. Linear and cyclic siloxanes are assayed in saturated, superheated and supercritical cycles. The cycle includes an internal heat exchanger (regenerative cycle), although a non-regenerative scheme is also solved. In the first part of the study, a current of combustion gases cooled to close to their dew point temperature is taken as the reference heat source. In the second part, the outlet temperature of the heat source is varied over a wide range, determining appropriate fluids and schemes for each thermal level. Simple linear (MM, MDM) siloxanes in saturated regenerative schemes show good efficiencies and ensure thermal stability of the working fluid.