Selection of working fluids for micro-CHP systems with ORC
Selection of working fluids for micro-CHP systems with ORC
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DOI：
10.1016/j.renene.2012.06.006
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发表时间：
2012-12
期刊：
影响因子：
8.7
通讯作者：
G. Qiu
中科院分区：
文献类型：
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作者：
G. Qiu
随着化石燃料库的枯竭和相应的空气污染物排放，我们迫切需要寻找替代、可再生和可持续的能源选择，以抵消我们对化石燃料能源供应的严重依赖。太阳能、地热、生物质燃烧热能和余热回收可用于驱动有机朗肯循环(ORC)的热电联产系统。工作液是影响ORC效率的关键因素，因此需要研究ORC系统中工作液的最优选择。本文对目前应用最广泛的8种工质进行了比较和优化，并用脊柱点法进行了较好的排序。用于中低温ORC的有机工质(有机制冷剂)具有较好的沸腾温度、较高的热降(即高热效率)、良好的换热特性、高度的热稳定性和化学稳定性、不燃性、低毒、不消耗臭氧和低成本等热力学、环境和经济标准。根据这些标准和脊柱点法，对8种应用最广泛的有机工质进行了表征，并按优选顺序列出：HFE7000、HFE7100、PF5050、R123、正戊烷、R245fa、R134a和异丁烯。应根据这些选择标准和特定热源选择适当的有机流体。
With depleting fossil fuel reservoirs and the corresponding emissions of air pollutants, we urgently need to look for alternative, renewable and sustainable energy options to counteract our strong dependence on fossil fuels for energy supplies. Solar thermal, geothermal, biomass combustion heat energy and waste heat recovery may be applied to drive combined heat and power (CHP) systems with organic Rankine cycle (ORC). Working fluid is a critical factor to affect the efficiency of the ORC, therefore optimal selection of the working fluid for an ORC-based system needs to be studied. This paper presents the comparison and optimization of 8 mostly-applied working fluids nowadays and gives a preferable ranking by means of spinal point method. The organic working fluids (organic refrigerants) for the medium-to-low temperature ORC have thermodynamic, environmental and economic criteria, such as preferable boiling temperature, high enthalpy drop (i.e., high thermal efficiency), favourable heat transfer characteristics, highly thermal and chemical stability, non-flammability, low toxicity, no ozone depletion and low cost. According to these criteria and spinal point method, the 8 mostly-applied organic working fluids are characterized and listed in order of preferable selection: HFE7000, HFE7100, PF5050, R123, n-pentane, R245fa, R134a and isobutene. An adequate organic fluid should be selected considering these selection criteria and the specific heat source.