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Calculation of landing platform convective current

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The calculation includes determining the amount of heat necessary to warm the air space of the landing platform in residential buildings to given temperature.  The task was to determine the amount of heat from radiators and the amount of heat absorbed by the walls at given temperature drop (deposition of thermal energy). After determining the heat loss from walls and heat liberation efficiency,  energy equilibrium / non- equilibrium is defined.
These calculations are performed in software package Ansys Fluent. Two models were plotted for these calculations: 3D model and air mass model. Further, computation mesh is designed  which is logged in the axial module. Boundary calculation conditions (temperature, materials, convection conditions) were introduced into the axial module.

Calculations include gravity force, wind velocity (average wind velocity in the building vicinity),  density and specific gravity of air mass, external temperatures of building and air mass and convection coefficients.

The calculation results identified that the heating unit energy is insufficient to heat the air space of the building landing platform and that the minimum temperature conditions were not fulfilled which explains the significant heat loss in the building.

The solution was to install an additional vertical stack into the heating system to increase the heat efficiency and improve the heat distribution of the air space of the landing platform. According to the calculations, when vertical stack is installed the heat efficiency of the heating system will be sufficient enough to heat the air space of the landing platform to minimum temperature.