Abstract
A study was attempted to change the existing operation method of operating two adjacent SCW underground heat exchangers, each with a single well. SCW-type geothermal heat exchanger allows up to 20 % bleed discharge in the event of a maximum load, which is thought to be an unreasonable use of groundwater. In this study, the purpose of this study was to improve the coefficient of performance (COP) of geothermal system by fundamentally preventing underground water discharge and keeping the temperature of the underground heat exchanger constant by organizing the abandoned bleed discharge water by two balanced well cross-mixing methods. The existing SCW heat exchange system and the balancing well cross-mixed heat exchange system are cooled through the test target installed at the site. As a result of the heating operation, the measured performance coefficient was 23 % for cooling operation and 12 % for heating operation. In addition, when operating with a balanced well cross-mixed heat exchange system, it was confirmed that the initial temperature of the underground was constant with a standard deviation of 0.08 to 0.12°C.
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