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Thermal and water management procedures in PEM fuel cells are described that influence stack performance. Using appropriate humidification and cooling strategies, stable high power density performance is predicted.Introduction:

This paper reports investigations of a passive system tht t!"ansportsheat fran a solar collector dounua~. Refrigerant is evaporated in a collector and the vapor transports heat to one or more coMensers locttad at qn arbitrary elevation below the collector. The vapor pressure Ii'?ts the condansad liquld to an accwlator locatxd near the top of the colleccor. The results of annual performance calculations are presented for q space heating application in uhlch one or wre condensers are located within passive thermal storage units that release heat directly to one or more zomes of the building. Simple sizing rules foroptin!al