AFFECTIVITY OF SURFACE COOLING OF FROZEN GROUND IN CONNECTION WITH MECHANISM OF TEMPERATURE SHIFT FORMATION
J.B. Gorelik1, A.K. Khabitov2
1Earth Cryosphere Institute, Tyumen Scientific Center SB RAS, Malygina str. 86, Tyumen, 625026, Russia
2Giprotyumenneftegaz, Respubliki str. 62, Tyumen, 625000, Russia
Keywords: Frozen soils, seasonal thawing layer, ground temperature regime, heat-insulation layer, GET cooling system, forced cooling, relaxation time to project temperature regime
Abstract
The analysis of affectivity of frozen soils surface cooling methods based on the theoretical understanding of temperature shift formation with seasonal processes in the upper ground layers is provided. The surface cooling method for the building with aerated underfloor space is suggested on the base of this analysis. This method includes heat-insulation layer ground surface and free convection cooling system with its horizontal evaporator under insulation layer. Condenser of the cooling system is out of the building contour and it makes evaporator temperature near to winter air temperature. The results of mathematical modelling demonstrate that suggested method provides a significant and rapid decrease of the ground temperature as compared to other methods (up to 1.0-2.5 °С for not more than 1.5 year instead of 3-5 years). An additional temperature decrease by 1.5 °С may be obtained by connecting of the forced cooling device to the cooling system for one summer season. The calculation results allow us to propose the best sequence for connecting the cooling elements of the system at the initial stage of its operation.
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