| 摘要 |
PURPOSE:To prevent an open type water feeding device from freezing and at the same time enhance the heat collecting efficiency by a structure wherein the water feeding device is installed between a hot water storage tank and the inlet of a heat collector and a heat exchanger to recover the heat of the working liquid, which leaves the hot water storage tank and returns to the heat collector, is provided in a tank housed in the water feeding device. CONSTITUTION:The high temperature working liquid, which has collected heat at a heat collector 1, flows through the outlet 1a out of the heat collector 1 and, after being cooled down to medium temperature by being heat-exchanged in a hot water storage tank 2, further flows toward the light 1b of the heat collector 1. At that time, the working liquid pre-heats the water 7 in the interior of the water feeding device 6 by passing through a heat exchanger 8 provided in the water feeding device 6. The pre-heating of feed water supplied to the hot water storage tank 2 as mentioned above can prevent the interior of the water feeding device from being frozen and at the same time results to heat the feed water somewhat and enhance the heat collecting efficiency of a solar heat collecting device. |
