Enhancing of solar still productivity using vacuum technology

Al-Hussaini, Hazim; Smith, I. K.

doi:10.1016/0196-8904(95)00003-v

Cited by 67 publications

(11 citation statements)

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“…where I is the solar radiation at the tilted surface, τg is the glass transmissivity, αg is the glass absorptivity, Tw is the water temperature, and Tg is the glass temperature. hrw is the radiation heat transfer coefficient from the water given as [27] h = εσ (T + 273) − T + 273 T − T Geothermal energy is used to supply cold water to the inner tube. This is accomplished by passing the inner tube through the ground to a depth of 2-3 m. At this depth, the ground temperature is at least 20-25 • C below ambient temperature in most areas of the KSA [26].…”

Section: Modeling Of Solar Stillmentioning

confidence: 99%

“…where I t is the solar radiation at the tilted surface, τ g is the glass transmissivity, α g is the glass absorptivity, T w is the water temperature, and T g is the glass temperature. h rw is the radiation heat transfer coefficient from the water given as [27]…”

Section: Modeling Of Solar Stillmentioning

confidence: 99%

“…where ε is the emissivity and σ is the Stefan-Boltzmann constant. h g is the glazing heat transfer coefficient given as [27]…”

Section: Modeling Of Solar Stillmentioning

confidence: 99%

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Enhancing Solar Still Performance Using Vacuum Pump and Geothermal Energy

et al. 2019

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Improvement in the performance of a solar still is investigated with the integration of a geothermal cooling system and a vacuum pump. Geothermal cooling is simulated to provide a cold, effective underground water temperature, which could reach 15–25 °C below ambient. Cooling is achieved by circulating water underground. As a result of this circulation, the cold fluid from the ground flows into a counter flow shell and tube heat exchanger. A vacuum pump is used to keep the solar still at a certain vacuum pressure. The sizes of the geothermal system and solar still are designed in such a way that the water outlet temperature from the ground and its flow rate are capable of condensing the entire vapor produced by the still. An analytical model was developed and then solved using the Newton–Raphson method for solving non-linear equations. A prototype was built to validate the analytical model. The results were in close agreement. A 305% increase in daily water productivity resulted from the proposed enhancements. After experimental validation, the effects of various parameters such as vacuum pressure, ambient temperature, and wind speed on the yield of geothermal solar still were examined. It was found that the increase in vacuum pressure enhanced performance, whereas the increase in wind speed had a detrimental effect on the yield of the solar still. A higher ambient temperature increased the yield of the solar still. Finally, the design of the heat exchanger for condensing the distilled water using geothermal cooling water was also investigated in terms of the increase in UA (the product of overall heat transfer coefficient and the area of heat exchanger) with inlet cooling geothermal water temperature.

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Section: Modeling Of Solar Stillmentioning

confidence: 99%

Section: Modeling Of Solar Stillmentioning

confidence: 99%

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Enhancing Solar Still Performance Using Vacuum Pump and Geothermal Energy

et al. 2019

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“…Cleaning the surface with jets of compressed air improves its productivity. Al-Hussaini & Smith [17] studied the effect of applying vacuum inside the solar still. A solar still's productivity was found to increase by 100% with the vacuum.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on modified single slope single basin active solar still

Sandeep¹,

Kumar

Dwivedi³

2015

Desalination

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“…Hermann 22 developed a corrosion free solar collector for sea water desalination. The effect of using different designs of solar stills 23 was studied by Hayek et al Hussaini and Smith used vacuum technology, 24 Kalogirou 25 designed a parabolic trough solar energy collectors, and Sebaii developed a triple basin solar still 26 for enhancing productivity of the solar still.…”

Section: Introductionmentioning

confidence: 99%

Industrial effluent treatment: Theoretical and experimental analysis

Velmurugan

Srithar²

2011

Journal of Renewable and Sustainable Energy

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Industries like textile and tannery are facing effluent disposal as well as water scarcity problems. To solve these two problems, an attempt has been made to convert the industrial effluent into potable water by using solar desalination methods. Effluent from textile industry is taken for analysis. In this work, single basin type solar still with fin at basin, stepped solar still with two different basin depths, and minisolar pond are the three types of solar devices used for effluent desalination. Sensible heat storage materials like pebble, black rubber, sponge, and sand are used in single basin and stepped solar stills to enhance the productivity. A minisolar pond is also connected with these stills to preheat the still water. For presettling the effluent, an effluent settling tank is fabricated. Maximum productivity occurs when the stepped solar still is modified with fin, pebble, and sponge and integrated with a minisolar pond. Theoretical analysis is made to validate the experimental results. Chemical analysis is also made for raw effluent, settled effluent, and desalinated water. For converting the desalinated water into potable water, some minerals are added. Cost analysis is also made.

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Enhancing of solar still productivity using vacuum technology

Cited by 67 publications

References 1 publication

Enhancing Solar Still Performance Using Vacuum Pump and Geothermal Energy

Enhancing Solar Still Performance Using Vacuum Pump and Geothermal Energy

Experimental study on modified single slope single basin active solar still

Industrial effluent treatment: Theoretical and experimental analysis

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