| 摘要 |
PURPOSE:To enable to prevent boiling of heating medium continuously regardless of shifting of the shade, by arranging heat collectors with high-temperature sensors in a proper manner, and providing a plurality of circuits for detecting the differential temperature in the titled circuit including solar-heat collecting means. CONSTITUTION:In a solar-heat collecting apparatus including a plurality of heat collectors 1 arranged in a plane, high-temperature sensors TH are connected, for instance, to three heat collectors 1 (a-c). Further, there are provided the same number of low-temperature sensors TL and differential temperature controllers 2. The low-temperature sensors TL are disposed in a heat exchanger 3 functioning as a load of the system or in a main pipe 4 on the inlet side of the heat collectors 1. Differetial temperature is detected by each pair of sensors TH, TL. Here, arrangement is such that a switch is turned ON for starting operation of a circulating pump 5 when either of the three pairs of sensors has detected a differential temperature higher than a predetermined value. On the other hand, when the differential temperature detected by the three pairs of sensors are all lower than said predetermined value, operation of the pump 5 is stopped. |
