| 摘要 |
<p>PURPOSE:To prevent the operation of a pump at night and reserve energy by a constitution wherein the heat collecting pump is operated only when the temperature of a solar heat collector is tending to increase and it is higher than the same of a hot- water reserving tank, in the hot-water utilizing solar heat, in which the hot-water reserving tank is connected thereto through the heat collecting pump. CONSTITUTION:A voltage is impressed to the inversional input minus side of a voltage comparator 14 by a resistor 12 and a hot-water reserving tank temperature detector 8 while the same is impressed to the non-inversional input pluse side thereof by a heat collector temperature detector 7 and the resistor 13. When the heat collector temperature 7 is higher than the hot-water reserving tank temperature 8 and the voltage difference between the plus side input and the minus side input of the voltage comparator 14 is exceeding a predetermined value, the output voltage of the comparator 14 is pulled to the plus side and the relay 22 is kept in a non-exciting condition. When a sample hold circuit 17 has decided that the heat collector temperature 7 is tending to increase, transistors 18, 23 are operated to excite the relay 22 and operate the heat collecting pump, not shown in the diagram. Thus, the operation of the heat collecting pump may be prevented when the solar heat collector is not being operated at night or the like.</p> |
