The heat exchanger in tube fixed from uses the heat of the earth, a convection and a hydraulic pres

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PURPOSE : An underground exchanging tube well is provided to reduce the heating cost for a vinyl house by pulling up thermal water without a power unit. CONSTITUTION : An underground exchanging tube well comprises an underground pipe(1) and a main injecting pipe. A re-cycling control device is consisting of a water injection valve(3), a temperature sensor(5), a water tank(6), a water level check sensor(7), a cyclic motor(8) and a recirculation water valve(9).