Abstract
ABSTRACT Amidst increasing fresh water crisis, sorption based solar powered atmospheric water harvesting (SPAWH) offers a promising solution to this problem. The available sorption based systems use composite desiccants that are expensive and artificially processed, which restricts their scalability and practical implementation. Moreover, the required desorption temperature available from the system is also low. The proposed system develops and experimentally investigates a novel composite desiccant material synthesized using anhydrous CaCl₂ impregnated in Jute (intrinsic host material), which is cheap and naturally available. To desorb the composite desiccant, 4.86 m2 double-ended vacuum tube collector is used, which produces peak hot air temperature of 134.2°C. The developed system using 12 kg composite of Jute/CaCl₂ harvests 5850 ml/day of water at 0.086 $/L cost with 13.93% thermal and 8.66% exergy efficiency. The results of the water analysis verify that the harvested water is of good quality and is safe for use.
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