GROUND COOLING DEVICE Russian patent published in 1998 - IPC

FIELD: construction engineering. SUBSTANCE: device is intended for increasing intensity and reducing duration of ground cooling process and also for cooling ground by utilizing adjustable process. Device incorporates casing pipe installed in ground bore-hole and containing internal pipe which is connected by air pipeline with suction or delivery pipe union of blower. Inserted into casing pipe is another pipe which communicates with ambient air medium or with air pipeline and can be longitudinally displaced inside casing pipe. Inserted pipe is made of material with low heat conductivity and is provided with coating made of heat-nonconducting material. Internal pipe is provided with ejecting head-piece on its end, and side surface of this pipe has spiral ribs and holes with diameter of 0.08-0.12 D. Aforesaid holes are made in lower part of pipe at pitch in length of 30-50 D, where D - inner diameter of pipe. EFFECT: higher efficiency. 2 dwg