Abstract
This paper demonstrates a laboratory experiments in order to investigate about thermal response for heat source (line or cylindrical) in the ground with ground water advection. The apparatus features to imitate ground water in a layer of sand filled into the apparatus. A prove buried in the sand layer can generate constant heat. Temperatures of the probe and each point in the sand layer were measured under a condition that the heat generation from the probe was constant. First, the experiments were carried out for several times by changing the ground water velocity. The time to achieve steady statement of the temperature change is shorter and the temperature is lower when the ground water flow is larger. Next, the each temperature variation calculated by the moving line source theory and numerical program applying finite difference method were validated by comparing with the measured one. The result showed that the calculated value reproduced the measured one. In addition, the authors proposed a method of estimation of the ground water velocity applying moving line source theory and estimated the velocity with experimental results as an example. As the result, it was confirmed that the errors between the velocities of the estimation with the method and the actual measurement are less than 100m/year or the relative errors are less than 20%.
