Performance analysis in near-critical conditions of organic Rankine cycle
Performance analysis in near-critical conditions of organic Rankine cycle
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DOI：
10.1016/j.energy.2011.11.033
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发表时间：
2012
期刊：
影响因子：
9
通讯作者：
Lisheng Pan;Huaixin Wang;Wei-xiu Shi
中科院分区：
文献类型：
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作者：
Lisheng Pan;Huaixin Wang;Wei-xiu Shi
根据流体临界温度和热源温度，有机朗肯循环可分为亚临界和超临界两类。对于给定的热源，某些有机流体不仅可以用于亚临界ORC，还可以用于超临界ORC。对于90℃的热源，两个兽人都可以使用HFC125、HFC143a和HF218。在膨胀机进口温度为85℃，热水质量流量为1 kg/S的条件下，研究了这三种物质在两种循环中的性能，结果表明，当流体从亚临界ORC进入超临界ORC时，循环热效率连续变化，而质量流量和净发电量变化不连续。亚临界条件下的最大净发电量高于超临界条件下的最大净发电量。对于HFC125和HFC143a，热水出口温度随加热压力比的增大而降低。对于HF218，热水出口温度随着热压比的增大先升高后降低，导致在高热压比条件下净发电量随热压比的增大而增加。
According to fluid critical temperature and heat source temperature, organic Rankine cycle (ORC) is recognized in two categories: subcritical ORC and supercritical ORC. For a given heat source, some organic fluids not only can be used in subcritical ORC, but also can be used in supercritical ORC. For heat source with temperature of 90 °C, HFC125, HFC143a and HF218 can be used in both ORCs. Performance of the three substances in both cycles, especially in near-critical conditions is studied with expander inlet temperature of 85 °C and hot water mass flow rate of 1 kg/s. The results show that when fluids go in supercritical ORC from subcritical ORC, cycle thermal efficiency varies continuously, while mass flow rate and net power generation vary discontinuously. Maximum net power generation in near-critical conditions of subcritical ORC is higher than that of supercritical ORC. For HFC125 and HFC143a, outlet temperature of hot water decreases with the increase of heating pressure ratio. For HF218, outlet temperature of hot water increases firstly and decreases secondly with the increase of heating pressure ratio, which leads to an increase of net power generation with the increase of heating pressure ratio in high heating pressure ratio conditions.