scholarly journals Theoretical and Experimental Analysis of Solar Still with Integrated Built-in Condenser

2018 ◽  
Vol 7 (4.15) ◽  
pp. 327
Author(s):  
Ghaleb Ibrahim ◽  
Husham M. Ahmed
Keyword(s):  
Middle East ◽  
Solar Energy ◽  
North Africa ◽  
Water Scarcity ◽  
Experimental Analysis ◽  
Experimental Results ◽  
Solar Still ◽  
Solar Distillation ◽  
Low Rate ◽  
Good Agreement

Water scarcity is one of the most important problems in Middle East and North Africa. Many researchers believe that solar distillation is the best solution to solve water scarcity, especially since these areas are characterized by abundant solar energy most days of the year. One of the main disadvantages of solar distillates is the low rate of production and therefore the research focuses on the factors that many enhance and improve the rates of production of the solar stills. In this paper, the performance of a passive built in condenser incorporated into a solar still is studied theoretically and experimentally using. A theoretical framework is developed to forecast the productivity performance (accumulated and hourly), the temperatures of the various elements of the stills. The theoretical and experimental results were compared together and discussed thoroughly.  Both theoretical and experimental results were in good agreement. The behaviors of both agree well with each other and have similar trends. 

Heat Transfer in an LTV Falling Film Evaporator: A Theoretical and Experimental Analysis

1968 ◽  
Vol 90 (2) ◽  
pp. 201-210 ◽  
Author(s):  
J. E. Kroll ◽  
J. W. McCutchan
Keyword(s):  
Heat Transfer ◽  
Mathematical Models ◽  
Flow Rate ◽  
Experimental Analysis ◽  
Experimental Results ◽  
Falling Film ◽  
Film Evaporator ◽  
Good Agreement

Two slightly differing mathematical models were developed to describe the heat transfer in the long tube vertical falling film process. The process was investigated experimentally with a 3/4 in. dia tube for various lengths up to 13 ft, for flow rate Reynold’s numbers from 1000 to 13000, for temperature differences of the order of 20 deg F, and for vacuum conditions down to 160 deg F. A comparison of theoretical and experimental results was made and was found to be in good agreement; that is, within 10 percent.

Mathematical modelling and experimental study of a solar distillation system

2011 ◽  
Vol 225 (5) ◽  
pp. 1203-1212 ◽  
Author(s):  
O Mahian ◽  
A Kianifar
Keyword(s):  
Mathematical Model ◽  
Wind Velocity ◽  
Low Cost ◽  
Solar Still ◽  
Solar Distillation ◽  
Distillation System ◽  
Insulation Thickness ◽  
The Mathematical Model ◽  
Basin Area ◽  
Good Agreement

The production of potable water from saltwater or brackish water using solar distillation has been practised for many years in different parts of the world. However, little attention has been paid to the feasibility of this technique in Iran. In this work, a solar still with a basin area of 0.9 m2 and a glass cover in the form of a pyramid has been designed and constructed, and its performance is studied experimentally in Mashhad, Iran. Also, the performance of the solar still is modelled where a small fan was utilized to enhance the daily productivity of freshwater. In addition to the effect of forced convection caused by a fan, the effects of the water depth, the insulation thickness of the basin base, and the wind velocity have been investigated. The empirical results have been compared with the results obtained from the mathematical model and good agreement has been obtained. The results show that the use of a low-cost fan with negligible power can be an effective and economical way of enhancing the evaporation rate and hence freshwater production. Based on the mathematical model, the daily productivity of freshwater increases up to ∼ 56 per cent at a Reynolds number of 35 000. Finally, an effective range for the wind velocity as well as insulation thickness is presented in order to optimize the production rate of freshwater.

scholarly journals Improvement and Nocturnal Extension of the Efficiency of a Solar Still

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Benaissa Mandi ◽  
Younes Menni ◽  
Rachid Maouedj ◽  
Giulio Lorenzini ◽  
Mohammad Hossein Ahmadi ◽  
...  
Keyword(s):  
Solar Energy ◽  
Thermal Energy ◽  
Storage Systems ◽  
Storage System ◽  
Negative Influence ◽  
Physical Parameters ◽  
Solar Still ◽  
Solar Distillation ◽  
Accumulated Temperature ◽  
Thermal Sources

Various studies have been made to improve the efficiency of the solar still. These studies had devoted to the combination of solar collectors with solar still. This article proposes the use of all forms of solar thermal or photovoltaic energy. In addition, photovoltaic electric storage systems convert them to thermal energy that increases the temperature of a greenhouse solar still. We investigated the possibility of improving the productivity of a greenhouse still and prolong solar distillation overnight. The proposed system is the incorporation of thermal energy produced by a parabolic-cylindrical concentrator, a greenhouse still, and photovoltaic solar energy by panels. The production at 14 pm reaches 110 L/m2 thanks to the various thermal sources made up of the hybrid still. It has better productivity than other distillers. The distillation is extended in the evening thanks to a storage system using electric batteries. The production at 18 pm to 18 L/m2 is reduced at 24 pm to 5 L/m2 in the dark. The accumulated temperature decreases the negative influence of the physical parameters on the production which exceeds 100 L/m2 per day. In the evening, the production is reached 16 L/m2 at 22 pm, which is an advantage compared to other distillers.

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