الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 32 |  |  |
| | | from | 32 | | |
Abstract
A numerical study has been carried out to investigate the transient thermal performance of a new humidification - dehumidification solar still. The still body is a relatively thin rectangular box with top glass cover and bottom condensing sheet. The still body is divided into two chambers (by a central insulated stepped sheet carrying a group of black coated basins), upper evaporation chamber and lower condensation chamber. Air is circulated between the upper evaporation chamber (where it is heated and humidified) and the lower condensation chamber (where it is cooled and dehumidified for water production) either in the form of forced circulation (by using a fan) or by natural circulation (thermosyphon effect).
The influences of different environmental, design, and operational parameters on the still productivity have been investigated in the case of forced circulation. The results indicated that increasing the solar intensity, ambient temperature, basin absorbitivity, and initial saline water temperature increases the system productivity. On the other hand, increasing wind velocity, basin insulation thickness, evaporation and condensation surface areas, condenser emissivity, and saline water mass have small effect on the productivity. The interesting result is that decreasing airflow rate has insignificant influence on the system productivity and efficiency. Decreasing airflow rate from 0.1 to 0.001 kg/s increases the productivity from 5.2 to 5.3 Liter/m”.