Theoretical and experimental study of a small unit for solar desalination using flashing process

A small unit for water desalination by solar energy and a flash evaporation process is investigated. The system is built at the Faculty of Petroleum and Mining Engineering at Suez, Egypt. The system consists of a solar water heater (flat plate solar collector) working as a brine heater and a vertica...

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Bibliographic Details
Published in:Energy conversion and management 2007-02, Vol.48 (2), p.528-538
Main Authors: Nafey, A. Safwat, Mohamad, M.A., El-Helaby, S.O., Sharaf, M.A.
Format: Article
Language:English
Subjects:
Applied sciences
Desalination
Energy
Equipments, installations and applications
Exact sciences and technology
Flash unit
Natural energy
Solar energy
Solar thermal conversion
Solar water heater
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Summary:A small unit for water desalination by solar energy and a flash evaporation process is investigated. The system is built at the Faculty of Petroleum and Mining Engineering at Suez, Egypt. The system consists of a solar water heater (flat plate solar collector) working as a brine heater and a vertical flash unit that is attached with a condenser/preheater unit. In this work, the system is investigated theoretically and experimentally at different real environmental conditions along Julian days of one year (2005). A mathematical model is developed to calculate the productivity of the system under different operating conditions. The BIRD’s model for the calculation of solar insolation is used to predict the solar insolation instantaneously. Also, the solar insolation is measured by a highly sensitive digital pyranometer. Comparison between the theoretical and experimental results is performed. The average accumulative productivity of the system in November, December and January ranged between 1.04 to 1.45 kg/day/m 2. The average summer productivity ranged between 5.44 to 7 kg/day/m 2 in July and August and 4.2 to 5 kg/day/m 2 in June.
ISSN:0196-8904
1879-2227
DOI:10.1016/j.enconman.2006.06.010