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| Heat Pipe Panel-How it Works |
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How it works: The inside of the glass tubes are coated with a special black absorber that absorbs nearly all the energy of the sunlight falling on it. The aluminum wings transfer the heat energy to the heat pipe. The liquid in the heat pipe boils and the steam travels up to the top of the heat pipe. The top bulb of the heat pipe (the condenser bulb) is in contact with cool water, which causes the vapour to condense. The drops of condensed liquid (a salt of potassium) then drip down the heat pipe. This cycle repeats so long as sunlight keeps heating the pipe and the top of the pipe is cool enough to condense the vapour. |
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The vacuum tube is composed of an inner tube, an outer tube, a selective absorption layer, a vacuum space, and "inspiratory" layer. The outer wall of the inner tube has the selective absorption layer, which absorbs 98% of the suns energy. The space between outer tube and inner tube is the vacuum space, which means no conductive heat transfer to the outside, even if the outside temperature is -40 C. At the bottom of the outer tube ,there is a "inspiratory" layer used to keep the vacuum. The end result is collection of the sun's energy with no way for the energy to escape except up the heat pipe to the water being heated.
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