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Exergy analysis of a latent heat storage system with phase change materials (PCMs) for a flat-plate was investigated. A selectively absorbing surface consists of nickel nano-particles was electrochemically prepared for solar collecting. The eutectic mixture formamide-sodium acetate trihydrate was used as phase change material (PCM), with a melting temperature of 40.5°C and heat of fusion of 255 kJ/kg. Exergy analysis, which is based on the second law of thermodynamics were introduced to evaluate efficiency of the system during the charging period. It was observed that the average energy and exergy efficiency of the system was 29.0% and 78.3%, respectively.
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