【摘要】 针对质子交换膜燃料电池运行中产生大量废热而未能被有效回收的问题，为提升能源利用效率，设计一款水-汽双热源板式换热器。通过改变其进口工况，系统分析蒸汽与冷却液温度变化对换热器热工性能的影响。结果表明：随着蒸汽温度升高，蒸汽换热量占比最高可达总换热量的40%；随着冷却液温度升高，冷却液换热量占比最高可达总换热量的82%。试验中，蒸汽侧与冷却液侧的换热系数最高分别达到156.9,783.44 W/（m~2??K），表明冷却液侧在双热源板式换热器中起主要作用。此外，随着蒸汽温度升高，换热效率逐渐下降；随着冷却液温度升高，换热效率逐渐上升；其中蒸汽温度对换热效率的影响更为显著，平均蒸汽温度每升高1℃，换热效率降低约0.74%。研究结果可为多热源余热回收提供参考。更多还原

【Abstract】 To address the issue of substantial waste heat generated during proton exchange membrane fuel cell operation not being effectively recovered,a water-steam dual-heat source plate heat exchanger was designed to improve energy utilization efficiency.By varying its inlet conditions,the effects of steam and coolant temperature changes on the thermal characteristics of the heat exchanger were systematically analyzed.The results show that as the steam temperature increases,the proportion of steam heat exchange can reach up to 40% of the total heat exchange.As the coolant temperature increases,the proportion of coolant heat exchange can reach up to 82% of the total heat exchange.During the experiments,the heat transfer coefficients on the steam side and the coolant side reached maximum values of 156.9,783.44 W/（m~2??K）,respectively,indicating that the coolant side plays a dominant role in the dual-heat source plate heat exchanger.Furthermore,as the steam temperature increases,the heat exchange efficiency gradually decreases;as the coolant temperature increases,the heat exchange efficiency gradually increases. Among these,steam temperature has a more significant impact on heat exchange efficiency:for every average increase of 1 ℃ in steam temperature,the heat exchange efficiency decreases by approximately 0.74%. The findings provide a reference for multi-heat source waste heat recovery.更多还原