Abstract
Solar water heating systems that incorporate latent heat storage unit deals with instabilities of insolation. But most previous studies focus on phase change materials (PCMs) with phase change temperature (Tm) below 80 oC. In this study, we investigate the performance of mannitol (Tm: 166.7, enthalpy of phase change γ: 323kJ kg -1) in storing solar thermal energy and producing hot water. Results show mannitol can store high-level energy and the thermal energy storage performance are affected by the inlet flow rate and temperature of heat transfer fluid. 14kg mannitol with latent heat activated can heat 100L water from 30 up to 50 oC in 6hours
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