Performance of multiple effect diffusion stills

✍ Scribed by M.M. Elsayed; K. Fathalah; J. Shams; J. Sabbagh

• Book ID: 103055253
• Publisher: Elsevier Science
• Year: 1984
• Tongue: English
• Weight: 919 KB
• Volume: 51
• Category: Article
• ISSN: 0011-9164
• DOI: 10.1016/0011-9164(84)85005-5

✦ Synopsis

Experimental testing of a three-effect diffusion still is carried out. The experiment is designed to test the effect of the heating fluid temperature input to the still Q and the feed rate of desalinated water to the still F on the performance of the still. The results produced several empirical relations to predict the following in terms of the G and F: the average temperature of each effect, the rate of distillate produced by each effect, and the performance ratio of the still. In addition, a mathematical simulation is given for the n-effect diffusion still. The mathematical model is verified by comparing its results with the experimental results of the three-effect diffusion still. The model is further used to predict the performance of a ten-effect diffusion still at the following parametric conditions: various values of the dimensionless parameters NJ and N4, various heating medium temperatures input to the still, and various feed rates to the still. SYMBOLS b -thickness of diffusion gap, m B -dimensionless thickness of diffusion gap cP -specific heat, J/kg K Di -rate of distillate per unit area produced in the i-th effect, kg/m2 h