A comparative study of pure and zeotropic mixtures in low-temperature solar Rankine cycle
A comparative study of pure and zeotropic mixtures in low-temperature solar Rankine cycle
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DOI：
10.1016/j.apenergy.2010.05.016
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发表时间：
2010-11
期刊：
影响因子：
11.2
通讯作者：
Jiang Wang;Li Zhao;Xiangxiang Wang
中科院分区：
文献类型：
--
作者：
Jiang Wang;Li Zhao;Xiangxiang Wang
本文对低温太阳能朗肯循环系统进行了现场实验研究。在实验样机的基础上，比较了纯流体M1(R245fa)、共沸混合物M2(R245fa/R152a，0.9/0.1)和M3(R245fa/R152a，0.7/0.3)的循环性能。实验是在不同流体的恒定体积流量下进行的。结果表明，随着R152a组分的增加，系统压力水平增加，功率输出相应变化，为容量调节提供了新的手段。在实验条件下，共沸混合工质的捕集器效率和热效率均高于R245fa纯流体，说明共沸混合工质具有整体效率提高的潜力。由于共沸混合物的非等温凝结，通过增加外部换热器可以部分回收冷凝热量。因此，与纯流体R245fa相比，共沸混合体系的整体效率可以得到提高。
The paper presents an on site experimental study of a low-temperature solar Rankine cycle system for power generation. The cycle performances of pure fluid M1(R245fa) and zeotropic mixtures M2(R245fa/R152a, 0.9/0.1) and M3(R245fa/R152a, 0.7/0.3) are compared, respectively, based on the experimental prototype. The experiments have been conducted under constant volume flow rate of different fluids. The results show that, with the component of R152a increasing, the system pressure level increases and the power output varies accordingly, which provides an additional means of capacity adjustment. The collector efficiency and thermal efficiency of zeotropic mixtures are comparatively higher than pure fluid of R245fa in the experimental condition, which indicates that zeotropic mixtures have the potential for overall efficiency improvement. Due to the non-isothermal condensation of zeotropic mixture, the condensing heat could be partially recovered by adding an external heat exchanger. Thus, compared with pure fluid R245fa the system overall efficiency of zeotropic mixtures could be improved.