Academic journal article European Journal of Sustainable Development

New Innovation of Low Cost Solar Still

Academic journal article European Journal of Sustainable Development

New Innovation of Low Cost Solar Still

Article excerpt


Wick type, W shape and L shape of solar stills were designed on the basis of solar declination angle, slope of collector and available insolation. During theoretical design calculations of solar still (Plate 1), peak winter season was considered. In winter season, December month was selected for finding the solar declination angle (δ), Slope of collector (β), intensity of insolation on horizontal and vertical surface and value of Cos θ is shown in Table 1. The newly developed solar stills were evaluated for load test and compared with the output of single and double slope solar still available in market.

Wick Type Solar still

Wick Type Solar still was fabricated at the central workshop of the College of agricultural Engineering and Technology, Dapoli. The pictorials view with different component of wick type solar still is shown in Plate1.

The device was consisted of a base frame made up of angle irons of size 25mm x 25 mm x 4mm, which was 1m x 1m in size and formed the rigid base for the complete unit.

The main frame was also made up of angle irons of size 25mm x 25 mm x 3 mm, rested on the base frame and hinged from one side for the angle adjustment. The frame was enclosed with the 18 gauge and 24 gauge GI sheets and a thermacol was placed in between the two sheets as insulation from all sides except from top. The absorber consisted of a corrugated sheet of 24 gauge and of 1m^sup 2^ area for increasing absorption of incident solar radiations. The unit was painted with blackboard paint for attaining higher absorption of incident solar radiations. The unit was covered with a glass cover of 5mm thick plane glass, fitted in aluminum frame having an area of 1m2. The greenhouse effect was possible due to glass which entrapped long wave radiations. The collected water vapour got condensed on inner side of glass.

Device was basically divided into three components as heating chamber, cooling cover and collection unit. Inside the heating chamber, GI pipe was provided for continuous water supply with 15 pin holes of 3 mm drill. The pipe was connected to a storage tank for continuous water supply.

The jute was used as a wick material, which was laid on the corrugated absorber plate with sufficient open area for exposing the black ridge of corrugated absorber. The wick material absorbed the droplets of water coming out from GI pipe and carried this water along the length of the material by capillary action. During this process unused water was collected through the drain outlet and distilled water was collected separately from opposite side and collected in beaker.

The water which was evaporated at higher temperature inside the heating chamber got condensed on the glass surface. The channel was provided for its collection. Water vapour inside the heating chamber got condensed in small droplets of liquid due to low temperature of glass cover. The total cost of this solar still was Rs.7241/- shown in Table 2.

Low cost (W-shape) solar still

Low cost (W-shape) solar still frame was design and fabricated at the central workshop of the College of Agricultural Engineering and Technology (CAET), Dapoli. This still was fabricated using 25 mm diameter M.S. pipe to make the frame as shown in Plate 2. The pipes and corners were well polished and laminated in order to avoid corrosions as well as to protect the polythene sheet from damage. The size of basin was 2 m x 2 m was prepared with black plastic covered basin in soil (Plate-2), in which water was impounded. The UV stabilized 200 micron polythene sheet of size 4 x 2.5 m was wrapped properly over the frame so that it became leak proof. The distilled water-collecting channel made from GI sheet wrapped with plastic was attached below to the frame with the help of non-corrosive wires.

The collecting channels were fabricated so as to catch the condensed droplets of water inside the solar still. The material used for the fabrication of this unit is presented in Table 3. …

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