| 摘要 |
PURPOSE:To maintain the liquid level in a solar heat collector in a predetermined range, constantly collect heat mainly through exchange of latent heat and contrive to enhance heat-collecting performance, by providing a liquid-reserving tank in which a ball tap is provided. CONSTITUTION:When collection of heat by evaporation of a latent heat type heat-transmitting medium in the solar heat collector 1 progresses, the liquid level is lowered, and the liquid level in the liquid-reserving tank 12 is also lowered correspondingly, resulting in that the ball tap 11 is opened. At this time, the pressure in a pipe provided between a pump 4 and the ball tap 11 is lowered below that in the condition wherein the tap 11 is closed. Then lowering of the pressure is detected by a pressure switch 10, and an electric current is passed to the pump 4 to start operation through a controller 13. When the liquid level is raised to a certain level, and the ball tap 12 is closed, the pressure in the pipe is raised by the pump 4. By these operations, the medium in a liquid state is fed in accordance with the quantity of the medium evaporated in the collector 1. Accordingly, heat is constantly collected mainly through exchange of latent heat, irrespectively of variations in the intensity of solar radiation, namely, variations in the quantity of the medium evaporated. |
