SOLAR HEAT COLLECTOR

PURPOSE:To improve the heat collecting efficiency by utilizing a short piping by a method wherein a heat collecting pipe fixed on a heat collecting plate in an outer box is communicated to a radiating pipe of a radiator provided at the lower part of the outer box, a working fluid having a low freezing temperature is circulated through said pipes, while an evaporator is arranged at the leeward side of the radiator. CONSTITUTION:An outer box 1 and a heat exchanging case 13 are covered with a transparent cover 2. During the sunshine time, the solar rays are absorbed with an absorbing film 7 of a heat collecting plate 6, an antifreezing solution in a heat collecting pipe 8 is heated. The solar heat collected by the heat collecting plate 6 is radiated from a radiating pipe 16 and a radiating fin 15 of a radiator 14, thus, the temperature of the open air introduced by a blower 21 is raised. The heat of the open air is absorbed with a heat absorbing fin 19 in the evaporator 18, a refrigeration medium flowed in the evaporating pipe 20 is evaporated. By the decreasing of the solar radiation quantity and the stopping of a circulating pump 17, the evaporator 19 absorbs the heat only from the open air by the operation of a blower 21. Thereby, the heat collecting from the open air can be performed effectively even in a cloudy period or night time, further, the heat collecting efficiency can be improved by utilizing a short piping.