A simulation of an underground heat storage system using midnight electric power

The purpose of this study is to investigate how much the peak daytime demand for electricity is reduced by an underground heat storage system that uses surplus electricity during the nighttime. In this paper, we report on a numerical simulation method and the results from an energy performance simulation of this system at Park Dome Kumamoto, a Kumamoto Prefectural indoor athletic facility. The simulation results were in good agreement with the measurements, and that shows that this simulation method is applicable for the prediction and optimization of an underground heat storage system for other conditions.