| 摘要 |
A 4'x8' sheet of 1/2'' plywood is sealed and painted black. A length of black rubber coated hose is mounted on the board with cable staples to form a single layer of coils. Twelve such boards having hoses so mounted thereon are placed side-by-side and groups of four adjacent boards are covered with a medium grade of clear vinyl. The vinyl is exposed to the sun which heats the boards and the hoses. Water from a swimming pool circulates through the hoses, which transfers heat to the water, and returns to the pool.
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