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Contribution of Night Time Yield to The Overall Water Production Capacity of A Simple Basin Solar Still Under Makurdi Climate

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Author(s): Edeoja, Alex Okibe 1 , Ibrahim, J. Sunday 1 ; Adaba, Sediyetu 1

Journal: American Journal of Engineering Research
ISSN 2320-0936

Volume: 2;
Issue: 8;
Start page: 32;
Date: 2013;
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Keywords: Cost of distilled water | Night time yield | Potable water | Solar radiation | Solar still | Thermal storage

ABSTRACT
The yield of the simple solar still is relatively very low and several research efforts are going on to improve it. In this work, 2 solar stills of aperture 0.003 m2inclined at 100were designed and constructed along with a rock bed thermal storage unit. One, still 1, was linked to the storage unit. Hourly ambient and still watertemperatures, incident insolation and volumes of water distilled were measured daily from 10:00 to 16:00 hours daily for 6 days in May 2011. The water in still 1 was drained daily at 16:00 hour and water from the storage unit introduced into it. The temperatures of the water in the storage unit were measured at 10:00 and 16:00 hours daily. The volumes of the water distilled during the night by the stills were measured daily in the morning. The efficiencies of the stills were computed. Stills 1 and 2 distilled maximum daily daytime mean volumes of 78.2 and 57.3 cm3respectively on the 6thday. The respective corresponding night time yields were 181 and 242 cm3. The maximum mean daily distillation efficiencies were respectively 31.1 and 25.1%. The total night time yield was about 43% of the total. The cost of distilled water was computed to be about N52.50/litre/m2. Hence, solar distillation remains a viable option for provision of potable in Makurdi metropolis and its environs.
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