Comparative analysis of CO2-based transcritical Rankine cycle and HFC245fa-based subcritical organic Rankine cycle using low-temperature geothermal source
Comparative analysis of CO2-based transcritical Rankine cycle and HFC245fa-based subcritical organic Rankine cycle using low-temperature geothermal source
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低温地热源CO2跨临界朗肯循环与HFC245fa亚临界有机朗肯循环对比分析
DOI：
10.1007/s11431-010-3123-4
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发表时间：
2010-06
期刊：
影响因子：
--
通讯作者：
Zhang ShengJun
中科院分区：
文献类型：
--
作者：
Guo Tao;Wang HuaiXin;Zhang ShengJun
对以低温地热源驱动的HFC245fa(1，1，1，3，3-五氟丙烷)为工质的CO2跨临界朗肯循环和亚临界有机朗肯循环(ORC)进行了详细的热力学和技术经济比较，以确定以最小投资实现最大净功率输出的配置。在相同的热力学平均热排出温度的基础上，通过改变某些系统运行参数，在不同的地热源温度水平(80℃~120℃)下，实现了每个朗肯循环的优化设计。结果表明，两个朗肯循环的最佳热力学平均热注入温度分布在给定地热源温度水平的55%~65%的范围内，基于CO2的跨临界朗肯循环的净输出功率增加3%~7%，涡轮进口体积流量减少84%。与基于HFC245fa的亚临界ORC相比，膨胀比降低了47%，总传热能力提高了1.68倍。研究还表明，采用基于CO2的跨临界系统可以降低涡轮的设计尺寸。然而，由于系统压力较高，因此需要更大的换热面积和更高强度的换热器材料。
A detailed thermodynamic and techno-economic comparison is presented for a CO2-based transcritical Rankine cycle and a subcritical organic Rankine cycle (ORC) using HFC245fa (1,1,1,3,3-pentafluoro-propane) as the working fluid driven by the low-temperature geothermal source, in order to determine the configuration that presents the maximum net power output with a minimum investment. The evaluations of both Rankine cycles have been performed based on equal thermodynamic mean heat rejection temperature by varying certain system operating parameters to achieve each Rankine cycle’s optimum design at various geothermal source temperature levels ranging from 80°C to 120°C. The results obtained show that the optimum thermodynamic mean heat injection temperatures of both Rankine cycles are distributed in the scope of 55% to 65% of a given geothermal source temperature level, and that the CO2-based transcritical Rankine cycle presents 3% to 7% higher net power output, 84% reduction of turbine inlet volume flow rate, 47% reduction of expansion ratio and 1.68 times higher total heat transfer capacity compared with the HFC245fa-based subcritical ORC. It is also indicated that using the CO2-based transcritical system can reduce the dimension of turbine design. However, it requires larger heat transfer areas with higher strength heat exchanger materials because of the higher system pressure.
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DOI：
--
发表时间：
1999-06
期刊：
Journal of Materials Science: Materials in Electronics
影响因子：
--
作者：
R. Akasaka;Hiroshi Suzuki;K. Hirowatari;D. Sonoda;Takehiro Ito
通讯作者：
R. Akasaka;Hiroshi Suzuki;K. Hirowatari;D. Sonoda;Takehiro Ito
影响因子：
6.4
作者：
D. Wei;Xuesheng Lu;Z. Lu;Jianming Gu
通讯作者：
D. Wei;Xuesheng Lu;Z. Lu;Jianming Gu
影响因子：
4.6
作者：
Xin‐Rong Zhang;H. Yamaguchi;K. Fujima;Masatoshi Enomoto;N. Sawada
通讯作者：
Xin‐Rong Zhang;H. Yamaguchi;K. Fujima;Masatoshi Enomoto;N. Sawada
影响因子：
10.4
作者：
Z. Gu;Haruki Sato
通讯作者：
Z. Gu;Haruki Sato
影响因子：
8.7
作者：
Xin‐Rong Zhang;H. Yamaguchi;D. Uneno;K. Fujima;M. Enomoto;N. Sawada
通讯作者：
Xin‐Rong Zhang;H. Yamaguchi;D. Uneno;K. Fujima;M. Enomoto;N. Sawada