make solar water
Solar heating to make hot water?
i am making a solar heating experiment which colours and materials would work best to keep the water as hot as possible?
why?
Your question seems to ask not what colors work best but why they work best.
The more sunlight a color absorbs the better and the more is reflected the less efficient the heater is.
So black and dark colors should work best and white and light colors should do poorly.
Having reflectors to concentrate the heat energy at the point of heating is also a consideration. Captive air (or a vacuum) around the heated material also helps hold the heat once it is captured.
The diference between plastic pipe or metal pipe is not a big factor in the efficiency of a solar heater. The conductivity of the pipe is a small consideration in the over all heat transfer. Maybe that should be one of the experiements you should do as a part of your project. Determine the difference between the two materials.
Solar Water Heater build 3
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