COOLING SUBTERRANEAN EXCAVATION

摘要

A subterranean excavation such as a mine working is cooled by a refrigeration plant having a heat rejection system at an upper station and a heat absorption system in the excavation, the refrigerant medium being ammonia. The system includes a surge drum at the upper station and maybe also at the excavation. Safety measures include the location of the vapor and liquid pipes in a borehole separate from the mine shaft or shafts.