Theoretical Analysis of a Water Desalination System Using Low Grade Solar Heat
Author:
Al-Kharabsheh S.1, Goswami D. Yogi1
Affiliation:
1. Solar Energy and Energy Conversion Laboratory, Mechanical and Aerospace Engineering Department, University of Florida, 220 MEB, PO Box 116300, Gainesville, FL 32611-6300
Abstract
Theoretical analysis of a solar desalination system utilizing an innovative new concept, which uses low-grade solar heat, is presented. The system utilizes natural means of gravity and atmospheric pressure to create a vacuum, under which liquid can be evaporated at much lower temperatures and with less energy than conventional techniques. The uniqueness of the system is in the way natural forces are used to create vacuum conditions and its incorporation in a single system design where evaporation and condensation take place at appropriate locations without any energy input other than low grade heat. The system consists of solar heating system, an evaporator, a condenser, and injection, withdrawal, and discharge pipes. The effect of various operating conditions, namely, withdrawal rate, depth of water body, temperature of the heat source, and condenser temperature were studied. Numerical simulations show that the proposed system may have distillation efficiencies as high as 90% or more. Vacuum equivalent to 3.7 kPa (abs) or less can be created depending on the ambient temperature at which condensation will take place.
Publisher
ASME International
Subject
Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment
Reference32 articles.
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