Abstract
A ground source heat pump (GSHP) is paying attention as one of the energy saving technologies. The purpose of this study is to investigate a heat exchanging performance of a ground source heat pump using direct expansion method. The direct expansion method for heat exchange will be more efficient comparing with the conventional indirect heat exchange method. However it is difficult to measure the calorimetric value of the heat pump system using direct expansion method because the refrigerant becomes two phase flow. Therefore, we evaluated the calorimetric value around the indoor unit of the heat pump system. We also improved the accuracy of the measurement of the velocity distribution using the traversing system of the hot wire anemometer.
