The use of imprudent fossil fuel affects on its exhaustion and environmental problem. Under this situation, development of alternative energy should be handled urgently.
Even though there are several alternative energies, among these, it is spotlighted that solar energy, which is unlimited, naturally is stored up for geothermal energy. There is the transformed energy from the Solar under the ground in which different temperature of the ground exist according to depth from the surface. That is, we can get supply of energy that we need based on depth of the ground. This research shows that the ground retains invariable temperature, that is 20℃ annually, in the standard of 11m below.
To use fixed temperature, at first, we install a pipe arrangement under the ground (11m below) and then inject water to heat it up with a pipe. Heated water will be pulled up from ground by circular pump, water flow into a place where the heat is needed with ventilator. Inflow of air temperature will maintain same temperature; it can be the evidence to utilize the geothermal energy.
If another theory can assume that it is impossible to maintain the same temperature(20℃); However, this supposition can be broken because of conservation of temperature under the ground. It is inevitable that the loss of heat (approximately 1℃~2℃) occur when temperature of the ground flow into the inside through ventilator.
It's hard to say that it's a kind of the loss of heat, because the loss of it is also essential to circulate through pipe. This research proves that internal ground temperature doesn't be influenced by external one and even a change in temperature.
As this point is turned out an efficiency of alternative energy, it's useful one to solve the problem about exhaustion of resources and environmental problem. When the flowing heat moves from the inside of ground to outside; besides, it can stream without loss of heat. It testifies to efficiency of air-conditioning and heating equipment by validity geothermal energy. Therefore, we can find a solution concerning energy problem if it can be commercialized for the future.