Introduction to Geothermal and Air
The shallow layer ground water has the warm in winter and cool in summer four seasons constant temperature characteristic, approaches in the local whole year atmosphere average temperature, nearly not free air temperature and earth interior temperature effect. The earth interior temperature is very high, in the normal condition drills well the depth to increase 100 meters water temperatures to elevate every time 2.5℃ about, the gradient of temperature bigger explanation geothermal resource is away from the ground to be nearer, more has the geothermy exploitation value. In order to obtain the low water temperature, the water well is not suitable too shallowly is not suitable is too deep, the practice proved that underground 5 to 30 meter depth water temperatures is coolest. 30 meter within shallow layer ground water can maintain the low temperature constant temperature characteristic the reason lie in the thermal always upward transpiration, the air conditioning always downward precipitate, from solar and from earth interior's quantity of heat can the atmospheric release. The natural air conditioning ground temperature air conditioning passes through one summer to move the absorption indoor quantity of heat completely by the recharge well around the soil absorption, passes through a winter to be able to restore to the primitive ground temperature, the ground temperature energy is the renewable natural energy.
