| 요약2 |
The underground temperature distribution is important to design of geothermal system. Temperature is directly related to the energy resources in the ground and it influences the efficiency of geothermal system. Especially, low-depth ground temperature profile is critical parameter to design horizontal ground heat exchanger. In this paper, ground surface energy balance equation is modified function of surface temperature to calculate ground temperature. This model is based on a transient heat conduction differential equation with the energy balance at the soil surface as a boundary condition. The boundary condition involves both short and long wave radiation energy, convection and latent evaporation energy. To solve surface and ground temperature, Newton-Raphson iteration method and Crank-Nicholson implicit method are utilized, respectively. And, the accuracy of the prediction model was verified by comparing with the weather data(Pusan, 2015). |