摘要
对突尼斯南部一个太阳能和地热能驱动的有机朗肯循环(ORC)电厂进行了能量和火用分析。分别研究了在冬季和夏季2天内主要运行参数对太阳能/地热联合ORC系统的影响,确定了系统的质量、能量和火用平衡。结果表明,系统不可逆性的主要来源是抛物面通流收集器。为了减少火用损耗,优化系统性能,采用多项式回归分析方法进行优化。由此建立了传热流体的质量流量和入口温度与太阳辐射的关系。该优化方案可使系统的火用效率在冬季提高2.06%~5.44%,在夏季提高1.00%~4.10%。此外,分析显示,在冬季,总能源效率和净功率分别提高了26.6%和21.0%。
Energy and exergy analysis of an organic Rankine cycle(ORC)power plant driven by solar and geothermal energy in southern Tunisia was conducted.The effects of main operating parameters on the combined solar/geothermal ORC system on two days in winter and summer were studied,where the mass,energy,and exergy balances were determined.Results showed that the main source of irreversibility was the parabolic through collector.Aiming to reduce the exergy destruction and to optimize the system’s performance,a polynomial regression analysis was applied.Hence,a relationship between both the mass flow rate and the inlet temperature of the heat transfer fluid and solar radiation was established.The proposed optimization can improve the system’s exergy efficiency by 2.06%to 5.44%in winter and 1.00%to 4.10%in summer.Also,the analysis revealed an increase in both the overall exergy efficiency and the net power by 26.6%and 21.0%,respectively,in winter.
关键词
火用效率
太阳能
地热能
优化
有机朗肯循环
exergy efficiency
solar energy
geothermal energy
optimization
organic Rankine cycle
作者简介
Corresponding author: Rafika MAALI, E-mail: rafikamaali@gmail.com, ORCID: https://orcid.org/0000-0001-5725-8692。
