Quick Answer
Improving water yield from a solar still involves increasing the temperature difference between the collection and evaporation points, and optimizing the still's design and material properties.
Maximizing Temperature Difference
To enhance water yield, ensure the collection point (the bottom of the still) is in contact with a dark, heat-conductive material such as black plastic or a metal plate. This helps absorb and retain heat from the sun. A temperature difference of at least 10°C (18°F) between the collection and evaporation points is recommended.
Optimizing Still Design
Design the still to maximize surface area and minimize evaporation losses. A ratio of 1:1 or 1:2 for the still’s width to depth is ideal. A still with a diameter of 30-40 cm (12-16 in) and a depth of 15-20 cm (6-8 in) is a good starting point. Angle the still’s sides at 10-15° to facilitate water flow towards the collection point.
Material Selection and Maintenance
Use a clear plastic sheet or a similar material for the still’s top to allow sunlight to pass through. Ensure the sheet is securely fastened to prevent water from entering. Regularly inspect and clean the still to prevent contamination and maintain its efficiency. A well-maintained solar still can produce up to 2 L (0.5 gal) of clean water per day in ideal conditions.
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