Patent ID: 8210163

Claim:
A semi-cylindrical solar collecting apparatus ( 1 ) for a solar boiler, comprising: at least one solar collecting container ( 2 ) having a semi-cylindrical shape closed at both end portions thereof by means of a side wall ( 3 ); a solar collecting plate ( 2 a ) disposed along the inner surface of the at least one solar collecting container ( 2 ), the solar collecting plate ( 2 a ) being formed of a mirror for reflecting sunlight; a transparent cover ( 3 ) adapted to close the front surface of the at least one solar collecting container ( 2 ); a heat-exchanging pipe ( 5 ) axially mounted in the at least one solar collecting container to pass through the at least one solar collecting container ( 2 ); a heat sensor ( 6 ) embedded into the heat-exchanging pipe ( 5 ) of the at least one solar collecting container ( 2 ) so as to sense a temperature of circulating water; upper and lower circulation pipes ( 7 ) connected to one side of a storage tank ( 20 ) so as to connect the upper and lower end portions of each heat-exchanging pipe ( 5 ) with the storage tank ( 20 ); a circulation pump ( 8 ) mounted at one side of the lower circulation pipe ( 7 ) connected to the storage tank ( 20 ) so as to be operated in response to the sensed signal of the heat sensor ( 5 ); a light sensor ( 9 ) disposed on the inside of the at least one solar collecting container ( 2 ) so as to sense sunlight; a first electronic valve ( 10 ) mounted on an end portion of each of the upper and lower circulation pipes ( 7 ) connected to the storage tank ( 20 ) in such a manner as to be opened and closed in response to the sensed signals of the light sensor ( 9 ) such that the first electronic valve is closed in response to the light sensor sensing darkness; an underground heat-exchanging pipe ( 11 ) adapted to be located under the ground in such a manner as to be connected to upper and lower auxiliary pipes ( 12 ), the upper auxiliary pipe ( 12 ) extending downwardly from one end side of the upper circulation pipe ( 7 ) in such a manner as to be adjacent to the electronic valve ( 10 ), and the lower auxiliary pipe ( 12 ) extending downwardly from one end side of the lower circulation pipe ( 7 ) in such a manner as to be located between the electronic valve ( 10 ) mounted at the lower circulation pipe ( 7 ) and the circulation pump ( 8 ); a second electronic valve ( 13 ) mounted on each of the upper and lower auxiliary pipes ( 12 ) in the semi-circular top and bottom such a manner as to be opened and closed in response to the sensed signals of the heat sensor ( 6 ) such that the second electronic valve is opened when the heat sensor senses a temperature below a predetermined temperature; and a controller ( 14 ) for controlling the operations of the heat sensor ( 6 ), the light sensor ( 9 ), the circulation pump ( 8 ), and the first and second electronic valves ( 10 and 13 ).