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Experimental Evaluation of a Multi-Stage Design Strategy in a Humidification-Dehumidification System for Desalination of Highly Saline Waters

Karimbeigi Darian, Reza | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57624 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Moosavi, Ali
  7. Abstract:
  8. In this research, an attempt has been made to construct an industrial-scale humidification-dehumidification water desalination system using the results of previous laboratory-scale studies and experiments by researchers. The constructed system consists of two separate sections, each containing two stages for humidification and dehumidification. It is noteworthy that only the bubble column method has been utilized in this system, with each stage containing ten layers to increase the moisture exchange between air and water. In this study, the effects of parameters such as the structure of the trays in each layer, the water height in each layer, air flow rate, and the temperature at various points in the system on the overall performance of the device were examined, and the results were illustrated in various graphs. According to the measured values and calculations, at a temperature of 80°C and air flow rates of 170 and 70 cubic meters, a water production rate of 21.6 liters per hour was achieved, with the system’s GOR (Gain Output Ratio) reaching 2.28. In the minimum state, at a temperature of 55°C and the same air flow rates, the fresh water production rate reached 13.2 liters per hour, with a GOR of 1.51. The results showed that increasing the air flow rate increases fresh water production; this is also true for the system’s high temperature, and increasing this parameter improves the system’s performance. Finally, the studies showed that the optimal water height in each layer is 3.5 centimeters, and increasing this height only leads to increased water pressure and higher energy consumption
  9. Keywords:
  10. Humidification-Dehumidification ; Desalination ; Heat Recovery ; Zero Liquid Discharge ; Air Bubbles and Water Direct Contact ; Multi-Stage Design ; Brine Circulation

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