Abstract
Purpose: Open-loop geothermal systems can be expected to have higher performance than a closed-loop geothermal systems. However, performance of open-loop geothermal systems are significantly affected by hydrogeological conditions such as porosity, permeability and groundwater temperature. In addition, clogging occurs due to floating particle in the well in case of long-term operation. Therefore, it is necessary to develop technology that ensure stable system performance and preserve hydrogeological conditions in the ground. Method: In this study, pairing technology between diffusion well and supply well was developed in order to maintain stable system performance and minimize the influence on the underground environment. In this paper, underground water level and temperature were calculated according to operation of system with the pairing technology. Performance of the system was compared to that of standing column well(SCW) geothermal system. Result: During heating operation of the system, groundwater level increased to depth of the pairing (- 1.5 m), but operation was not stopped. Finally, S.COP of two-well pairing system and SCW geothermal system was 2.71, 2.79 respectively.
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