Abstract
Standing column well (SCW) geothermal heat exchanger permits a bleeding discharge of less than 20% in the event of a maximum load, which is an inappropriate method of using underground water. In this study, the existing operational method of two adjacent SCW geothermal heat exchangers, each with a single well, was modified. This technology aims to improve the coefficient of performance (COP) of the geothermal system by fundamentally preventing underground water discharge and maintaining a constant temperature of the underground heat exchanger. To curb the bleed water discharge, two balancing wells of cross-mixing methods were employed. The result of the cooling and heating operations with the existing SCW heat exchange system and the balancing well cross-combined heat exchange system showed that the measured COP increases by 23% and 12% during the cooling and heating operations, respectively. When operating with a balanced well cross-mixed heat exchange system, the initial temperature of the underground was constant with a small standard deviation of 0.08–0.12 °C.
Highlights
Technology using the underground environment in architecture has been applied in various forms from an energy-efficient perspective, such as in the composition of space and elements for responding to climate change
An automatic cross-operating control system was used to maintain the optimal supply of heat sources for the existing standing column well (SCW) and for balancing well underground heat exchangers
The cross mixing of the balancing well resulted in an approximately 23% improvement of the coefficient of performance (COP)
Summary
Technology using the underground environment in architecture has been applied in various forms from an energy-efficient perspective, such as in the composition of space and elements for responding to climate change. The soil constituting the underground environment is a porous body formed by three phases of water, pore, and soil particles. The water constituting the soil is further divided into soil water and groundwater. An open geothermal heat pump system using underground water from the aquifer is expected to perform better as a heat exchange medium than an enclosed system through a direct heat exchange with heat sources. Its performance is considerably affected by the groundwater quality and quality conditions, such as groundwater heat. Problems such as a drop in groundwater levels, depletion of groundwater, and a drop in temperature occur due to groundwater intake and injection.
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