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Optimized solar-powered liquid desiccant system to supply building fresh water and cooling needs

N. Audah, N. Ghaddar and K. Ghali

Applied Energy, 2011, vol. 88, issue 11, 3726-3736

Abstract: This paper studies the feasibility of using a solar-powered liquid desiccant system to meet both building cooling and fresh water needs in Beirut humid climate using parabolic solar concentrators as a heat source for regenerating the liquid desiccant. The water condensate is captured from the air leaving the regenerator. An integrated model of solar-powered calcium chloride liquid desiccant system for air dehumidification/humidification is developed. The LDS model predicted the amount of condensate obtained from the humid air leaving the regenerator bed when directed through a coil submerged in cold sea water. An optimization problem is formulated for selection and operation of a LDS to meet fresh water requirement and air conditioning load at minimal energy cost for a typical residential space in the Lebanon coastal climate with conditioned area of 80m2 with the objective of producing 15l of fresh drinking water a day and meet air conditioning need of residence at minimum energy cost. The optimal regeneration temperature increases with decreased heat sink temperature with values of 50.5°C and 52°C corresponding to sink temperatures of 19°C and 16°C.

Keywords: Solar-powered liquid desiccant system; Water extraction from atmosphere; Design optimization of liquid desiccant system; Dehumidification/humidification processes (search for similar items in EconPapers)
Date: 2011
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