| 摘要 |
PURPOSE:To enable heat collection of solar heat corresponding to a load even when the load becomes lighter, by enabling an alteration of a number of operation units of heat collectors divided into plural blocks based on the priority order of usage of them. CONSTITUTION:Heat collectors are divided into plural blocks 1a-1c based on the priority order of usage of them, and the blocks are connected in parallel with each other through taking in branch pipes 4a-4c and taking out branch pipes 11a-11c of a thermal medium. Drain pipes 10a-10c connected with a heat collecting tank 2 which accumulates thermal medium are connected with all of the blocks or each of the blocks other than the top priority one, and the taking in branch pipes 4a-4c and the drain pipes 10a-10c of these blocks are provided with automatic valves 8a-8c and 9a-9c which are opened or closed according to a load. Heat collection of solar heat corresponding to a load is carried out even when the load becomes lighter, and a situation that a system becomes not applicable at the time of a light load is prevented from occurring, that is, by enabling a change of the number of operation units of heat collector according to the load. |
