Heat and mass transfer analysis of passive solar still with nanoparticles, operating at different water depth and various slope of glass cover

2021 ◽  
Vol 235 ◽  
pp. 1-25
Author(s):  
Vikas Kumar Thakur ◽  
Manoj Kumar Gaur
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Water Depth ◽  
Solar Still ◽  
Glass Cover ◽  
Passive Solar Still ◽  
Passive Solar

Study of heat and mass transfer phenomena and entropy rate of humid air inside a passive solar still

Desalination ◽  
2017 ◽  
Vol 409 ◽  
pp. 80-95 ◽  
Author(s):  
Yemna Sarray ◽  
Nejib Hidouri ◽  
Ali Mchirgui ◽  
Ammar Ben Brahim
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Entropy Rate ◽  
Solar Still ◽  
Humid Air ◽  
Passive Solar Still ◽  
Passive Solar

Influence of Various Basin Types on Performance of Passive Solar Still: A Review

2021 ◽  
Vol 10 (4) ◽  
pp. 789-802
Author(s):  
Tri Hieu Le ◽  
Minh Tuan Pham ◽  
H Hadiyanto ◽  
Van Viet Pham ◽  
Anh Tuan Hoang
Keyword(s):  
Water Depth ◽  
Thermal Efficiency ◽  
Tracking System ◽  
Design Parameters ◽  
Cylindrical Shape ◽  
Solar Still ◽  
Practical Utilization ◽  
Passive Solar Still ◽  
Passive Solar ◽  
The Impact

Passive solar still is the simplest design for distilling seawater by harnessing solar energy. Although it is undeniable that solar still is a promising device to provide an additional freshwater source for global increasing water demand, low thermal efficiency along with daily distillate yield are its major disadvantages. A conventional solar still can produced 2 to 5 L/m2day. Various studies have been carried out to improve passive solar stills in terms of daily productivity, thermal efficiency, and economic effectiveness. Most of the researches that relate to the daily output improvement of passive solar still concentrates on enhancing evaporation or/and condensation processes. While the condensation process is influenced by wind velocity and characteristics of the condensed surface, the evaporation process is mainly affected by the temperature of basin water. Different parameters affect the brackish water temperature such as solar radiation, design parameters (for example water depth, insulators, basin liner absorptivity, reflectors, sun tracking system, etc). The inclined angle of the top cover is suggested to equal the latitude of the experimental place. Moreover, the decrease of water depth was obtained as a good operational parameter, however, the shallow water depth is required additional feed water for ensuring no dry spot existence. Reflectors and sun-tracking systems help solar still absorb as much solar intensity as possible. The internal reflector can enhance daily yield and efficiency of stepped solar still up to 75% and 56% respectively, whereas, passive solar still with the support of a sun-tracking system improved daily yield up to 22%. Despite large efforts to investigate the impact of the different parameters on passive solar distillation, the effect of the basin liner (including appropriate shapes and type of material), needs to be analyzed for improvement in practical utilization. The present work has reviewed the investigation of the solar still performance with various types of basin liner. The review of solar stills has been conducted critically with rectangular basin, fins basin, corrugated basin, wick type, steps shape, and cylindrical shape basin with variety of top cover shapes. The findings from this work conclude that the basin liner with a cylindrical shape had better performance in comparison with other metal types and provides higher freshwater output. Stepped type, inclined, fin absorber, and corrugated shapes had the efficient performance.  Further exploration revealed that copper is the best-used material for the productivity of passive solar still.

Effect of Inclination of Condensing Cover and Water Depth in Solar Still for Maximum Yield: In Winter Climatic Condition

2005 ◽  
Author(s):  
Anil Kr Tiwari ◽  
G. N. Tiwari
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Water Depth ◽  
Climatic Condition ◽  
Maximum Yield ◽  
Effective Area ◽  
Solar Still ◽  
Passive Solar Still ◽  
Water Depths

In this communication, an effect of inclination of condensing cover and water depth in still, on convective mass transfer coefficient in passive solar still has been studied. Three solar stills with effective basin area of 1 m2 for three inclinations of condensing cover namely 15°, 30° and 45° have been considered. Another still with same effective area but fixed cover inclination of 30° is considered to see the effect of water depths on still performance for water depths 0.04m, 0.08m, 0.12m, 0.16m and 0.18m. Outdoor experiments have been conducted for Delhi climatic condition. Hourly variations of water, vapor, and cover temperatures along with yield have been measured. Regression analysis is used to determine the convective heat and mass transfer coefficient for outdoor condition. The 45° condensing cover is found giving maximum yield and lower water depth responded for higher yield in winter climatic condition.

Effect of Heat Capacity of Basin Material and Glass Cover on Distillate Yield of Single Slope Passive Solar still – A Theoretical Investigation

2015 ◽  
Vol 787 ◽  
pp. 43-47
Author(s):  
V. Sivakumar ◽  
E. Ganapathy Sundaram ◽  
B. Sakthikiran ◽  
T. Sanjay Krishnan ◽  
A. Riyaz Hussain
Keyword(s):  
Mathematical Modeling ◽  
Heat Capacity ◽  
Thermal Properties ◽  
Specific Heat ◽  
Thermal Analyses ◽  
Solar Still ◽  
Glass Cover ◽  
Distillate Yield ◽  
Passive Solar Still ◽  
Passive Solar

In most of the thermal analyses to develop a mathematical model for the conventional single slope passive solar still, it is found that heat capacity of the basin and glass cover are neglected to simplify the mathematical modeling. However all the materials have their own specific heat and according to the specific heat the material store some amount of heat energy within it. As a result the heat transfer between the system components of a solar still and thermal losses from the components will vary depending on their thermal properties like heat capacity, absorptance and thermal conductivity of components. Due to this, the temperature variation of the different components of a solar still is not only the function of solar intensity nevertheless also the function of their thermal properties. Subsequently it is necessary to consider the heat capacity of all the components of a conventional still. In this paper, mathematical modeling was developed to study the effect of heat capacity of basin material and glass cover on distillate yield of single slope passive solar still. The study found that considering the heat capacity of the components increase the distillate yield of the single slope passive solar still.

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