Semi-cylindrical solar collecting apparatus for solar boiler

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 (2a) disposed along the inner surface of the at least one solar collecting container (2), the solar collecting plate (2a) 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 heat sensor (6) and the light sensor (9);
• 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) and the light sensor (9);
• 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).