Solar Drier/ Solar Cooker/ Solar Oven Theme: Solar Energy Use

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Solar drier
This is a method for increasing the efficiency and cleanliness of solar drying. Fruit and vegetables are dried on racks in a small chamber with a solid earth back wall and plastic film covering. The drier is constructed from available stone, mud, bamboo and white plastic sheet and built facing south to maximize the sunshine it receives. The design ensures a constant airflow.
  • Can dry 6-8 kgs of food in 2 days (depending on thickness and water content)
  • Saves about 40% of drying time compared to in the open
  • Keeps food clean during the drying process and reduces unhygienic exposure to dust, insects, birds, and others
  • Can easily be moved to optimise exposure to the sun 
  • Is an efficient use of solar energy
Solar cooker
The solar parabolic cooker is a reflecting surface in the form of a parabolic dish which concentrates the solar rays at a focal point on which the cooking pot is placed. The reflector is mounted in such a way that it can be easily adjusted to face the sun. The quantity of heat delivered to the cooking pot is proportionate to the reflector size; very high temperatures can be attained sufficient for most conventional cooking such as rice and lentil soup (dal). The net power of the cooker is approximately 700 watts in good sunshine. Recently Solarsource 1 (an improved parabolic cooker designed and promoted by One Earth) was installed for demonstration.

Solar oven
  • Cooks 3 to 4 items in 2 hours (enough for a family of 3-4)
  • Can be used in all seasons when there is adequate sunshine 
  • Reduces the consumption of fuel  wood 
  • Reduces the drudgery of firewood collection (usually done by women) 
  • Helps to save the forest and environment
  • Is an efficient use of solar energy
Solar water disinfecting device (SWAD)
Disease-causing organisms in water are killed by exposure to heat in a process called pasteurisation. Water that has been heated to 65ºC (150ºF) for a short period of time is free from most common harmful microbes and is safe to drink.
  • Can be used to disinfect 6-12 litres of water per day 
  • Helps to reduce consumption of fuel wood, exposure to smoke from burning wood, and the drudgery of collecting wood. 
  • Is an efficient use of solar energy.

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For further information contact:

Samden Sherpa