The solar energy group of the Renewable Energy Research Centre, Vietnam, has designed an efficient solar water heater. The system consists of three collector-cum-storage tanks with a total capacity of 90 litres. Inside the tank, a metal plate is linked under the solar energy absorber surface. The water-heating mechanism in this is based on thermosyphon effect (with solar radiation, the space between the absorber and the metal decreases, making the water rise and fall alternatingly). A convection current within the tank then occurs resulting in the mixing of hot and cold water and thus warming all the water.
We are a voice to you; you have been a support to us. Together we build journalism that is independent, credible and fearless. You can further help us by making a donation. This will mean a lot for our ability to bring you news, perspectives and analysis from the ground so that we can make change together.
Comments are moderated and will be published only after the site moderator’s approval. Please use a genuine email ID and provide your name. Selected comments may also be used in the ‘Letters’ section of the Down To Earth print edition.