THE POSSIBILITY OF USING THE HEAT STORAGE CAPACITY OF THE SOIL BASE TO MAINTAIN THE HEAT-EFFICIENT MODE OF OPERATION OF LINEAR OBJECTS OF UNDERGROUND URBAN TRANSPORT
The effectiveness of the protection of the equipment of the metro station from the effects of different nature depends not only on the technical serviceability, but also the ability of technical systems to operate the necessary time in offline mode. Maintenance of temperature parameters should be carried out with a high indicator of efficiency of a complex of optimum engineering decisions, methods and means of rational consumption of energy saving and use of its renewable sources. The article considers the possibility of using the heat storage capacity of the soil mass surrounding the linear object of the underground deep-laid, to minimize the energy consumption of the projected system of technological air conditioning of the object. The substantiation of the assumptions adopted in the development of the theoretical model is given. Analysis of the calculation results by the developed model showed that with appropriate geometrical dimensions and thermophysical characteristics of materials of building structures and the environment required temperature mostly will be provided by the heat storage capacity of the reinforced concrete construction and the surrounding soil massif. To achieve maximum effect, it is necessary to operate the process equipment in accordance with the algorithm of operation (operation of the units in the «hot» mode, which is preferable from the point of view of efficiency, alternates with operation in the «cold» mode). A cyclogram of the functioning of the subway structure in accordance with this algorithm for one of the calculated cases is presented. The studies of various models of underground metro stations, characterizing the main building modules of the subway, allowed to confirm the assumption of the existence of a local minimum of the calculated curve of temperature change on the surface as a result of the action of a heat source, taking into account the boundary conditions of the second and third kind with an abrupt decrease in energy consumption.