PIPE FOR COLLECTING SUBTERRANEAN HEAT, SUBTERRANEAN HEAT EXCHANGER, AND HEAT PUMP UTILIZING SUBTERRANEAN HEAT

摘要

PROBLEM TO BE SOLVED: To provide a pipe for collecting subterranean heat, a subterranean heat exchanger, and a subterranean heat utilizing air conditioning system capable of efficiently carrying out heat exchange with subterranean heat by optimizing a flow velocity of heating medium gas in an outer side piping, and capable of reducing material costs. SOLUTION: A heat insulating sleeve 27 is attached to an outer circumference of one inner side pipe 26. Thee outer side pipes 28 connected at multiple points to a lower end part of the inner side pipe 26 are spirally wound on an outer circumference face of the heat insulating sleeve 27, and upper end parts of the outer side pipes 28 are merged and connected to a pipe 32. The pipe for collecting subterranean heat comprised of the inner side pipe 26, the heat insulating sleeve 27, and the outer side pipe 28 are housed in an interior of a housing tube 25 buried in a pile well. Heat exchange is carried out between subterranean heat and heat of the heating medium gas flowing in the outer side pipes 28. COPYRIGHT: (C)2009,JPO&INPIT