Nashrieh Shimi va Mohandesi Shimi Iran

Nashrieh Shimi va Mohandesi Shimi Iran

Analysis of First and Second Thermodynamic Laws for Water Desalination System Based on Humidification-Dehumidification Process for Closed-Air Open-Water Cycle

Document Type : Research Article

Authors
Taha Khademinejad
Hassan Rahimzadeh
Department of Mechanical Engineering, Amirkabir University of Technology, P.O. Box 15875-4413 Tehran, I.R. IRAN
Abstract
The humidification-dehumidification desalination system is a carrier-gas-based thermal desalination technique which is ideal for small-scale water production purposes. This technique has attracted many attentions in previous years due to low fossil energy demand and its low integration costs. In this paper, the water desalination system based on humidification-dehumidification process in closed-air open-water cycle is investigated thermodynamically by the commercial software EES.  Furthermore, the effects of the governing parameters such as humidifier and dehumidifier effectiveness ( and ), temperature of the inlet water into the humidifier and dehumidifier ( and ) and mass rate ratio () are investigated  to maximize the performance of the system which is presented by Gained Output Ratio (GOR) and minimize the non-dimension entropy generation rate (). Form thermodynamic analysis of the system we can conclude that the efficiency of the whole system is more affected by efficiency of the dehumidifier rather than the efficiency of the humidifier. Moreover, in low mass rate ratio,GOR increase for lower inlet water temperatures of dehumidifier. On the other hand, in high mass rate ratio, higher temperatures of inlet dehumidifier water will lead to higher performance (GOR) of the system.
Keywords
thermodynamic analysis
Humidification-Dehumidification
Close air-open water cycle
Water desalination
Engineering Equation Solver (EES)

Subjects

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