METHOD OF COOLING UNDERGROUND STRUCTURES IN MASSES OF PERMAFROST ROCKS AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2017 - IPC F25D1/00 

FIELD: mining.

SUBSTANCE: method of cooling underground constructions in masses of permafrost rocks includes the accumulation of cold in the upper part of the frozen soil masses in the winter season through a seasonally operating air cooling device. Underground construction is located at a depth, which is determined by the formula:

,

where h₁ - the depth of seasonal thawing of soils, in the sole of which there are pipes of the cooling device, m; τ - duration of the cooling device operation in the cold season (taken equal to the time delay of the temperature wave at the depth of the underground construction location) per season, h; λ and C - the average values of the thermal conductivity coefficient, W/(m⋅K⋅), and the volumetric heat capacity of the soil, J/(m³⋅K), in the roof of the underground structure; T - the amplitude of external air temperature fluctuations, K. The device for year-round cooling underground constructions in masses of permafrost rocks includes two independent air cooling devices, each of which includes, at least, one horizontal cooling pipe in the ground and, at least, two vertically oriented tubes that protrude above the surface of the earth. Internal volumes of vertical and horizontal pipes are connected. At least, one horizontal cooling pipe of one cooling device is laid in the ground close to the side wall of the underground construction at the mid-height level, and, at least, one horizontal cooling pipe of the second cooling device is laid in the bottom of the seasonal thawing layer.

EFFECT: increasing the reliability, reducing energy costs, increasing the autonomy of cryogenic storage and ensuring low negative temperatures in underground constructions throughout the year.

4 cl, 2 dwg