R600a/R601a喷射式有机闪蒸循环系统性能分析

Performance analysis of R600a/R601a Organic Flash Cycle with Ejector

中文关键词: 非共沸工质  喷射式OFC  净输出功率  热效率  ?效率  ?损

英文关键词: zeotropic working fluid  organic flash cycle with ejector  net power output  thermal efficiency  exergy efficiency  exergy loss

中文摘要:

      基于MATLAB软件构建了稳态的喷射式有机闪蒸循环（OFC）系统模型，采用R600a/R601a的混合物为系统循环工质，对150℃的地热水进行热能回收利用。分析了最优闪蒸压力工况下不同摩尔组分的R600a对系统最大净输出功率、热效率、系统最大?效率和最小总?损等参数的影响。研究结果表明：随着R600a摩尔组分的增加最优闪蒸压力呈现不断上升的趋势，且当R600a/R601a混合工质摩尔组分为0.7/0.3时，系统最大净输出功率、热效率和?效率达到最大值，同时系统最小总?损达到最小值。相较于R601a和R600a两种纯工质，系统最大净输出功率分别提高5.25%和33.81%，热效率分别提高0.07%和1.48%，系统最大?效率分别提高1.41%和7.11%，系统最小总?损分别减小2.09%和9.33%。因此采用非共沸工质R600a/R601a，可有效提高喷射式OFC系统的热力性能。

英文摘要:

      Based on MATLAB, a steady-state model of Organic Flash Cycle(OFC) with Ejector system was established. The mixture of R600a and R601a was used as the circulating working fluid to recover the heat energy of 150 ℃ geothermal water. And the thermal performance of Organic Flash Cycle with Ejector system was simulated. The effects of different R600a mole fraction on the maximum net power output, thermal efficiency, maximum exergy efficiency and minimum total exergy loss of the system were analyzed under the optimal flash pressure. The results show that: the optimal flash pressure presents a rising trend with the increase of R600a mole fraction, and when R600a mole fraction is 0.7, the net power output, thermal efficiency and exergy efficiency of the system reach the maximum separately, and the total exergy loss of the system reaches the minimum. Compared to R601a and R600a, the maximum net power output of the system is increased by 5.25% and 33.81%, the thermal efficiency is increased by 0.07% and 1.48%, the maximum exergy efficiency is increased by 1.41% and 7.11%, and the minimum total exergy loss is reduced by 2.09% and 9.33%, respectively. Therefore, the mixture of R600a and R601a can effectively improve the thermal performance of Organic Flash Cycle with Ejector system.