【摘要】 为提高氢质子交换膜燃料电池(PEMFC)能量利用率,提出以R245fa/R123混合工质有机Rankine循环(ORC)作为冷却系统并回收PEMFC余热。使用Aspen Plus软件建立ORC混合系统模型,通过固定冷凝温度、固定冷凝压力等不同限制条件,分析了混合工质R245fa的混合质量分数对系统性能的影响。结果表明:混合比R245fa/R123=0.6/0.4的工质,在冬季工况和固定冷凝压力101.3 kPa时,余热回收率最高,分别为10.90%和11.08%;非共沸混合工质相对纯工质有较强的工况适应性,通过调整混合比,可在不同工况下充分回收PEMFC余热。更多还原

【Abstract】 An organic Rankine cycle(ORC) with R245 fa/R123 zeotropic mixture as cooling system to recover the waste heat of proton exchange membrane fuel cell(PEMFC) was proposed to improve the energy utilization factor. An ORC hybrid system was established using Aspen Plus software. The influence of the mass fraction of zeotropic fluids R245 fa on ORC system performance was analyzed by fixing the condensing temperature and pressure etc. The results show that R245 fa/R123 with mixing ratio of 0.6/0.4 has the highest waste heat recovery at winter and 101.3 kPa at fixed condensation pressure, which are 10.90% and 11.08%, respectively.Zeotropic mixtures have better working condition adaptability than pure components. By adjusting the mixing ratio, the waste heat of PEMFC can be fully recovered under different working conditions.更多还原