EFFICIENCY OF SURFACE COOLING OF FROZEN SOIL FOUNDATION USING A FORCED REFRIGERANT CIRCULATION UNIT
J.B. Gorelik1, A.K. Khabitov2, I.V. Zemerov1
1Earth Cryosphere Institute, SB RAS, Tyumen, Russia
2Tyumen, Russia
Keywords: frozen soils, seasonal thawing layer, ground temperature regime, heat-insulation layer, forced cooling, time to reach the required temperature
Abstract
A method for surface cooling of frozen foundations has been proposed. It includes heat insulation through the soil surface and a unit for forced circulation of a refrigerant. The latter is used only in summer during the entire period of operation of the structure. The method has important advantages in comparison with the known methods of surface cooling: a) a seasonally thawed layer can’t be formed at any time of the annual cycle and the cooling impulse enters the ground base throughout the entire calendar year; b) in urban conditions, the use of a machine cooling method (instead of seasonally operating cooling systems) is quite reasonable since it does not require significant space for its implementation. Analysis of the results of temperature fields calculating demonstrates quick cooling of the ground base: for all calculation options, the temperature at the depth of zero annual amplitude in the second year of operation reaches a value corresponding to hard frozen state of most of the soils. The decrease becomes even more significant in the third year of operation. The calculation results are rather weakly dependent on the distance between the cooling elements of the applied cooling system within the considered range of variation of that value (from 0.7 to 1.0 m).
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