Experimental Validation for Two Stages Humidification- Dehumidification (hdh) Water Desalination Unit
نویسندگان
چکیده
This paper demonstrates the preliminary experiments for two stage water desalination by humidification-dehumidification HDH process. An experimental set-up consists of two stages of closed air humidification dehumidification units. In this design, the saline water was heated by evacuated tube solar water heater integrated with electrically heated tank. A series of tests were performed in outdoor environment, in order to assess the effect of mass flow rate of the feed water, and initial water temperature on the productivity of the system. Solar radiation, wind speed, relative humidity, mass flow rate of the feed water, process air and cooling water, mass of condensate water and temperatures at various locations were obtained during the experiments. The results showed that maximum flow rate was 18.5 L/h obtained from two stages at inlet water temperature of 80 o C. If we consider flow rate of saline water of 4 L/min, average sunshine in summer of 10 h, and evacuated tube area of 9.53 m 2 the maximum water production will be 19.4 L/d/m 2 of solar energy. Comparison between theoretical and experimental yield of fresh water indicated that the condensation efficiency is 24.6% indicating that the most challenging step in HDH process in the dehumidification step. The energy consumption 12.8 kWh/m 3 could be obtained if we involve photovoltaic cell. Also, water production could be further improved if we utilize the spent saline water in a subsequent desalination stage.
منابع مشابه
Experimental and simulation studies on two stage humidification– dehumidification desalination and cooling plant
• Experimental demonstration of two stage desalination and cooling • Use of chilled water for condensation of humid air • Simulation of experimental results • Comparative study on conventional condensation and improved condensation • Improved design of proposed integrated plant a b s t r a c t a r t i c l e i n f o Humidification–dehumidification (HDH) desalination is a simple and cost effectiv...
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