A MODEL OF FREE CONVECTION IN ABOVEGROUND VERTICAL FIRE TANKS WITH AN INTERNAL FLUE

It is proposed to install a flue that passes through a vertical reservoir from bottom to top and is connected to the facility's climate system, which allows the use of residual thermal energy of the outgoing airflow, which prevents freezing of the remaining water supply. It is shown that effective optimization involves the use of the results of full-scale or mathematical modeling of heat transfer processes in the tank, as well as inside the flue, tank walls and thermal insulation layers. The field of full-scale and numerical modeling included two liquids (water inside the tank and air inside the flue), an internal steel wall and a polyurethane insulating material covered with an external protective steel shell, as well as an external airspace. The numerical solution was obtained using the CFD code ANES for the entire domain by discretizing the control equations using finite volume methods. The proposed numerical model can be used to describe in detail the thermal phenomena occurring inside a fire tank with an internal flue and predict the thermal and hydrodynamic parameters of the structure under study.