Loading...

On the Performance of the Geothermal Dehumidifier of the Solar-Driven Hdh Desalination System: a Numerical Study

Habibi, Alireza | 2023

68 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55846 (08)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Mechanical Engineering
  6. Advisor(s): Hakkakifard, Ali; Kazemzadeh Hannani, Siamak
  7. Abstract:
  8. The solar-driven humidification-dehumidification desalination system with a geothermal dehumidifier (SD-HDH-GD) has been given special attention, for producing drinking water and subsurface irrigation applications. This contribution scrutinizes the performance of the geothermal dehumidifier of the SD-HDH-GD system. To this aim, a comprehensive three-dimensional transient computational fluid dynamics model of the geothermal dehumidifier and the surrounding soil is developed. An experimental setup is established to verify the developed numerical model. At first, the performance of the system in a short-term period of 12 hours is investigated, and the effect of several operation parameters is examined. Then, to establish the importance of ground heat recovery, three scenarios of system operation in long-term performance are introduced, and it is shown that daily operation of the SD-HDH-GD system with an on fan at night to circulate the air in the buried pipes is the best scenario. Finally, the long-term performance of the SD-HDH-GD system is scrutinized using the design of experiments and considering six operating parameters, and the optimized case of system performance is determined regarding the gain output ratio (GOR). In the five-year analysis of the optimized case, the GOR of the system for the first to fifth year is 0.753, 0.750, 0.748, 0.747, and 0.747, respectively. Disregarding the performance of the system at the beginning of the first year, the yearly system performance is nearly identical in all five years, and the daily amount of condensed water and recovery ratio is higher on winter days than on summer days. In contrast, the outlet temperature of the air mixture from the ground heat exchanger and GOR is lower on winter days than on summer days. Also, it is suggested that the SD-HDH-GD system will be designed with a closed-loop air mixture
  9. Keywords:
  10. Ground Heat Exchanger ; Ground Thermal Recovery ; Experiments Design ; Solar Still ; Geothermal Dehumidifier ; Long-Term Performance ; Humidifier-Dehumidifier Desalination

 Digital Object List

 Bookmark

No TOC