| 摘要 |
The invention provides a solar water heating apparatus with double-row vacuum tubes coupled to a water tank made of stainless steel or enamel. Each of the vacuum tubes is made of an exterior tube and an interior tube separated by a vacuum. The exterior tube is transparent. The interior tube is covered with a layer of light-absorption material. When sunlight shines on the vacuum tube, the water in the tank and the water in the interior tube circulate by convection.
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