Abstract
The ground source heat has recently attracted considerable attention as the renewable energy. The temperature of the underground less than 100m depth is constant by geothermal energy throughout the year. Thus, the ground source heat pump (GSHP) is one of saving energy systems. The GSHP system radiates heat at the cooling mode to the underground and extracts heat at hte heating mode from the underground. This paper describes the influence that operation of the GSHP system gives to the underground temperature. As a result of the experiment, it was found that both the cooling and heating mode gave only less than 2℃ change of the underground temperature.
