How should solar stills be set up in different weather conditions?

Weather-Resistant Positioning

When setting up solar stills in windy or rainy conditions, it’s essential to position them in a way that minimizes disruption to water collection. Place stills in a depression or a low-lying area to prevent water from flowing away. Ensure the center of the still is at least 6-8 inches above the surrounding ground to prevent flooding. A slight incline of 1-2 degrees can also help water to drain away from the still.

Maximizing Efficiency in Direct Sunlight

In direct sunlight, angle your solar stills to maximize evaporation and condensation efficiency. Position the still with the black plastic sheet facing directly towards the sun, allowing it to absorb as much heat as possible. Aim the collection tube at an angle of 10-15 degrees to encourage condensation to flow down into the collection container. This angle will also help to prevent water from evaporating back into the air.

Insulating Solar Stills in Cold Temperatures

In cold temperatures, insulate your solar stills to prevent freezing. Use insulating materials such as straw, grass, or even newspaper to line the inside of the still. You can also use a layer of water to insulate the still from the cold ground. Place the still in a sheltered area to protect it from wind and extreme temperatures. By insulating the still, you can maintain the temperature and keep the still operational, even in freezing conditions.