Estimation of economic efficiency of convective heating methods

The methods of convective heating of thin-walled monolithic structures constructed in winter conditions in tunnel formwork are considered. The classification of convection heating methods, based on the principle of heat flow to the heated structure, is made: traditional chamber heating, chamber heating with air ducts, convection heating with pre-form curtains, developed at the Department of Construction and the theory of structures of the South Ural State University. The efficiency of capital investments for the methods under consideration is determined on the basis of the determination of the area under the investment curve. The unit costs in rubles per cubic meter of heated concrete for the considered methods are calculated. The results on capital investments and specific costs for heat treatment of concrete by convective methods are compared. The authors draw the conclusions about the effectiveness of using the method of convection heating with pre-form curtains for heat treatment of monolithic thin-walled structures, constructed in tunnel formwork due to a more efficient use of energy from heat generators, which allows shortening the duration of concrete keeping.