Heat and Mass Transfer of a Coolant in Horizontal Seasonal Cooling Devices

Abstract

The heat-mass transfer in the seasonal cooling device with air coolant is considered in this article. This device works during the cold period of year at the expense of the difference between temperatures of soil and air. Their thermal calculation which comes down to drawing up thermal balance for determination of temperature of coolant, being its main characteristic is considered. The engineering method of calculation of heat fluxes of the soil and the pipeline laid in the thickness is developed. Also, there were made a natural measurements of the cooling system. Experimental research was made for the purpose of establishment of qualitative and quantitative regularities of communication of the key parameters characterizing operation of the seasonal cooling devices: air temperatures and speeds of its circulation with the defining factors – the air temperature, wind speed, temperature of soil and its heat-physical properties. Results of researches were used also as the actual material during the checking and justification of theoretically determined formulas.

Forecast of Thermal Mode for the Slope Fill-Up Ground, Considering the Operation of Seasonal Cooling Units in Cryolithic Zone Conditions

“…Coefficient of heat exchange a of atmospheric air with the ground mass surface in winter depends on snow cover depth [11] and is determined from the formula: (7) where δs, λs -depth (m) and heat conduction coefficient of the snow cover (W/(m•К)); a0 -empirical coefficient of convective heat exchange (W/(m 2 •К)) calculated from Yurgens formula [12]: (8) where v -wind speed, m/s.…”

“…It is recommended that artificial freezing of the ground would be performed with seasonal cooling units (SCU) [5][6][7][8]. Development of various engineering and technical solutions for freezing processes as well as countermeasures against thawing with loss of bearing capacity of rock require enhancement of numerical mathematical simulation method, taking into account the actual circumstances of SCU thermal impact on thermal mode of the ground.…”

Modeling the Temperature Field in Frozen Soil under Buildings in the City of Salekhard Taking into Account Temperature Monitoring

“…To predict and prevent such consequences, the method of geotechnical monitoring is used [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48], an important element of which is the performance of temperature measurements in the soil in the PF of a capital structure and the analysis of the dynamics of their changes [43]. Longterm forecasting of such changes and their impact on the bearing properties of foundation soils under buildings will make it possible to conclude if it is necessary to make steps to increase the bearing capacity of piles by correcting the temperature regime of the soil under the building, for example, by thermal stabilization of the foundation soil with the help of seasonal cooling devices (SCDs) [49][50][51][52][53][54][55][56][57], the use of ground surface cooling [58], the use of ventilated piles [59], the cooling of casing pipes [60], or to freeze the soil at the site of the planned piling foundation before construction of capital facilities [56].…”