Investigation of the effect of the top and the bottom temperatures on the performance of humidification dehumidification desalination systems

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

12 Scopus citations


Humidification dehumidification process is an attractive small scale water desalination technique in which desalinated water is produced by mimicking the nature's water cycle. Various modifications to the basic HDH system can be vital in improving the productivity and reducing the production cost of the fresh water. In this study, a closed-air-open-water waterheated (CAOW-WH) cycle and a closed-air-open-water airheated (CAOW-AH) cycle are modeled and optimized. Effects of mass flow ratio, humidifier and dehumidifier effectiveness, relative humidity, top and bottom temperatures (main concern of study) on the gain output ratio (GOR), the recovery ratio (RR), entropy generation in the system have been analyzed and presented. It has been observed that an optimal mass flow ratio exists for both the cycles, which maximizes the GOR of the system. Moreover, effectiveness of the humidifier and the dehumidifier is an important parameter, which determines the productivity of the systems. Furthermore, a higher GOR can be obtained at low Tmin and high Tmax and at high Tmin and low Tmax for systems heated by a water heater, whereas the GOR of the air heated HDH system increases with increasing both the Tmin and the Tmax for values of humidifier and dehumidifier effectiveness of 0.8. This study provide extended design charts for building an optimum HDH system to produce a predetermined rate of desalinated water.

Original languageEnglish
Title of host publicationEnergy
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791850589
StatePublished - 2016

Publication series

NameASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)

Bibliographical note

Funding Information:
The authors acknowledge King Fahd University of Petroleum and Minerals (KFUPM) for supporting this work.

Publisher Copyright:
Copyright © 2016 by ASME.


  • Dehumidifier
  • Desalination
  • HDH
  • Humidifier
  • Optimization

ASJC Scopus subject areas

  • Mechanical Engineering


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