Numerical simulation of heat transfer process in inclined roofs with radiant barrier system

Abstract EN

In this study, the performance of using radiant barrier in inclined roof was numerically investigated by using the COMSOL multiphysics software package.

a roof was simulated as two parallel plates with an air gap in between for enhancing ventilation through convection heat transfer.

the simulated results were validated using a published experimental work.

results suggest that a maximum of 89% reduction in the heat gain through the roof for a heated channel with a uniform heat flux of 650 w/m² was possible.

moreover, the roof inclination angle reduces the heat gain through the roof up to 41.5% for an inclined angle of 75 degrees.

variable heat variation effect was considered in a case study to account for ambient temperature and solar heat flux intensity variation from hour to hour throughout the day.

this effect will have a direct impact on the heat transfer through the roof.

using radiant barrier helps reduce the amount of heat transfer through the roof up to 28.2% when 75-degree inclined roof is used.