Analytical expression for thermal efficiency of a passive solar still

Singh, Sunaina; Tiwari, G.N.

doi:10.1016/0196-8904(91)90117-2

Cited by 16 publications

(4 citation statements)

References 3 publications

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“…Yousef and Mousa [18] carried out thermal modeling of a regenerative type solar desalination and reported 20% higher yield than conventional solar still. Thermal analysis is done by Singh and Tiwari [19] for various alignments of a passive regenerative solar still and validates the outcomes with reasonable agreement.…”

Section: Mk Gaur Et Al / Desalination and Water Treatment 158 (201mentioning

confidence: 69%

“…where L = latent heat of fusion of ice and h cf = convective heat transfer coefficient between cover and water film flowing over it. The equivalent heat transfer coefficient (h e ) from water film to the ambient air is given by Singh and Tiwari [19]: The total upward inside heat transfer coefficient within the distiller is given by:…”

Section: For Ice Cooled Condensing Covermentioning

confidence: 99%

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Development of empirical relations to compute the heat transfer coefficients for distiller operating in different operating modes

Gaur¹,

Tiwari²,

Kushwah³

2019

Desalination and Water Treatment

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The paper focuses on the performance assessment and development of mathematical expressions for calculating heat and mass transfer coefficients for a distiller operating in two modes: (i) condensing cover cooled with ice and (ii) condensing cover without cooled. These expressions are simulated for interior and exterior condition for different water temperature ranging between 35°C and 85°C. Empirical relations are developed for finding the condensing cover temperature at a certain water temperature. The value calculated from the derived empirical relations is used for finding the values of heat transfer coefficients and yield. Result shows that predicted and numerical value are nearly same (less than 2% difference). The predicted value of yield deviates maximum of 3% from numerical and 5.7% from experimental value.

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Section: Mk Gaur Et Al / Desalination and Water Treatment 158 (201mentioning

confidence: 69%

Section: For Ice Cooled Condensing Covermentioning

confidence: 99%

Development of empirical relations to compute the heat transfer coefficients for distiller operating in different operating modes

Gaur¹,

Tiwari²,

Kushwah³

2019

Desalination and Water Treatment

Self Cite

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“…During the experimentation they maintained the constant flow velocity of water over the glass surface. S.A. Lawrance et al [14,15] conducted the similar study and observed the significant yield of solar still with the large heat capacity of mass of water in the basin. Figure 3.…”

Section: Introductionmentioning

confidence: 86%

Development and Economical Analysis of Innovative Parabolic Trough Collector Integrated Solar Still

PATİL,

SHEKHAWAT

et al. 2024

International Journal of Thermodynamics

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Experimental setup of the integrated parabolic trough collector (PTC) with solar still was developed. PTC was designed considering the solar geometry and the physical laws of parabolic shape and the concentrators. Test were conducted at the location with latitude 19.9975ON and longitude 73.7898OE. Theoretical analysis was done using ray tracing and engineering equation solver (EES) software while designing the system. PTC system was developed with dimensions of 1.5 m length, 1 m width and a concentration ratio (CR) of 21.22. Theoretical thermal efficiency was predicted as 48.1% whereas experimental average thermal efficiency is observed as 42.76%. The observed temperature difference between the vapor and the glass cover is about 17 °C and between ambient air and vapor is about 24.4 °C. Maximum water temperature in the conventional solar still was 64.6 °C where as for the PTC coupled solar still was 74.4 °C. PTC coupled solar still is having averagely 37% higher production rate. This has definitely added an advantage because of the higher energy absorption rate compared with the conventional solar still. PTC coupled solar still system has nearly 35% more heat absorption. Total embodied energy of the system is around 896.875 kWh. Total capital cost of the system is Rs. 41300/-. Total annual output of pure water is around 3 L/Day. Estimated energy payback period is around 2.29 years and the total carbon credit earned is Rs. 2165.38 per year.

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“…They found 11.82% increase in daily production of still by water cooling of cover located in North whereas by shading north cover the enhancement in output was about 2.94%. Singh & Tiwari [13] presented mathematical model of a double slope solar still with provision of water flown over glass cove at constant velocity. They discovered that cooling the glass cover boosts solar efficiency dramatically, especially at high water depths in the basin.…”

Section: Water Cooled Cover Of Double Slope Solar Stillmentioning

confidence: 99%

Enhancement of distillate output of solar still by cooling glass cover

Sarkar

Tiwari

Somwanshi

2022

ijhs

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The difference in temperature between the temperature of the basin water and the temperature of the glass cover is the most important regulating factor for getting yield from a solar still. The higher the temperature differential, the more distillate the solar still produces. This temperature difference can be enhanced either by increasing the temperature of basin water by decreasing glass cover temperature or combining both strategies together. A strategy for lowering the temperature of a glass cover is to cool it with air or flowing water. Cooling the glass cover by water not only boosts the production of the still but also cleans it. The presence of dust particles on the glass cover reduces the amount of solar energy impacting on water in basin, which is continuously cleaned by water flowing over it. In present work a detailed review on the various methods used to cool glass cover have been discussed. The decrease in temperature of cover is up to 20oC by cover cooling and the maximum increase in efficiency of solar still by cover cooling is about 20%.

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Analytical expression for thermal efficiency of a passive solar still

Cited by 16 publications

References 3 publications

Development of empirical relations to compute the heat transfer coefficients for distiller operating in different operating modes

Development of empirical relations to compute the heat transfer coefficients for distiller operating in different operating modes

Development and Economical Analysis of Innovative Parabolic Trough Collector Integrated Solar Still

Enhancement of distillate output of solar still by cooling glass cover

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