Performance Analysis of ORC System for Non-Zeotropic Mixtures Under Different Solar Energy Sources

doi:10.12096/j.2096-4528.pgt.2018.028

Abstract

Abstract:

The characteristic of working fluids is one of the important factors that affect organic Rankine cycle (ORC) system.Under the different heat source temperature, 11 substances were adopted as the subcritical ORC working fluids, R245fa and R601, as well as 9 non-zeotropic binary mixtures in different mass ratios.The thermal and economic model of the ORC had carried on the analysis.Finally, the method of grey correlation was used to evaluate the system performance.The study shows that the thermodynamic indexes of non-zeotropic binary mixtures are approximately inverse proportional to the temperature glides.When the temperature slip is greater than 5℃, the pure industrial performance is better.The system using the non-zeotropic mixtures is less economical than the pure working fluids.Incombination, when the heat source temperature is fixed, the grey correlation grade increases first and then decreases with the increase of evaporation temperature.The temperature glide of R601/R245fa(0.1/0.9) is the best and its performance is optimal.Using mixed R601 and R245fa as working fluid, system performance is best when the heat source temperature is 160℃.

Key words: solar energy, non-zeotropic mixtures, organic Rankine cycle (ORC), grey correlation grade, heat source temperature

Yujiong GU,Limin CHEN,Zhi GENG. Performance Analysis of ORC System for Non-Zeotropic Mixtures Under Different Solar Energy Sources[J]. Power Generation Technology, 2018, 39(2): 177-187.

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