| 摘要 |
<p>PURPOSE:To control starting and stopping of a heat collecting pump without any loss of control by a constitution wherein the starting and stopping of the heat collecting pump is controlled by a value obtained by dividing the amount of sunshine with a temperature difference between the temperatures of a heat accumulating tank and atmosphere. CONSTITUTION:The output voltages of a heat accumulating temperature sensor 8 and an atmosphere temperature sensor 7 output a voltage proportional to the temperature difference between the temperatures of the heat accumulating tank and the atmosphere in a first subtraction circuit 11. The output of a sunshine sensor 6 and the same of the subtraction circuit 11 are inputted into a division unit 17 consisting of first and second logarithmic circuits 10, 12 and the second subtruction circuit 13, a voltage, proportional to a value obtained by dividing the amount of sunshine with the temperature difference between the temperatures of the heat accumulating tank and the atmosphere, is compared, for deciding, with a voltage generated in a reference voltage generating circuit 14 in a decision circuit 15, and the ON-OFF of the heat collecting pump is controlled by inputting an ON-OFF signal into a driving circuit 16. According to this constitution, a decision whether the heat collection is possible or not may be obtained and the useless operation of the heat collecting pump may be eliminated.</p> |
