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HIMHOT: Low-Cost Solar Water Heaters for Himalayan Region

Submitted by Baerbel Epp on January 5, 2013

A study carried out in 2011 initiated by the Global Solar Water Heating Project (GSWHP) of the United Nations Development Programme (UNDP) clearly stated the need for low-cost solar water heaters in the Himalayan Region. The GSWHP later used the study’s findings to organise a design competition with the aim to develop innovative low-cost solar water heaters suitable for this region. The requirements: the systems had to be light, modular, not require piped water supply and cost around INR 1,500 (approx. USD 300). One of the competition’s successful outcomes has been the HIMHOT, a storage collector with a transparent cover area of 0.5 m x 0.5 m. The photo shows the HIMHOT prototype being tested by a family in the northern Indian Himalayan region. The tests have shown that on a clear and sunny day, one unit can provide 25 litres of hot water with a ∆T of 25 to 30° per day.
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