| 摘要 |
PURPOSE: A hybrid geothermal system using large boreholes and construction method thereof are provided such that ground water freely flows as horizontal boreholes are formed in a direction of an aquifer or radial direction. CONSTITUTION: A hybrid geothermal system using large boreholes comprises a water reservoir(2), large boreholes, a plurality of perforated pipes(11), a composite heat exchange pipe(4), an upper valve(5), a lower valve(6), and a filing material(7). The inside of an underground space is finished by reinforced concrete, and the water reservoir is formed after the ground(1) is excavated to the planned depth. The large boreholes are formed at the side wall of the water reservoir along a peripheral direction at constant intervals. The perforated pipes are inserted into the large boreholes, and ground water smoothly flows in the water reservoir. The vertical and horizontal heat exchanging pipes of the composite heat exchange pipe are installed in the water reservoir. The upper and lower valves are installed in the composite heat exchange pipe, and open-type and close-type systems are selectively applied. The filling material is charged in the upper part of the water reservoir to protect geothermal heat. |
