Suppression of natural convection heat transfer coefficients in an attic shaped enclosure

Abstract

The use of convection suppression devices has been widely discussed in the literature as a means of reducing natural convection heat loss from enclosed spaces. In this study the use of a single baffle was examined as a possible low cost means of suppressing heat loss by natural convection in an attic shaped enclosure.

Simulation of the influence of an attic on the building energy efficiency in the Portuguese climate

“…Heat transfer by conduction through the floor of the attic would be reduced by insulation, but other heat transfer mechanisms inside the attic would need to be dealt with, such as convection and radiation. [18][19][20][21] The attics…”

“…The heat exchange within this space should be governed by convection and radiation. 25 Even in a sealed attic there would always be fluid motion and consequently heat transfer by convection 18 due to temperature difference between surfaces and the air. The average air temperature as well as the interior surfaces of the southern slope and the floor of each attic during winter and summer period are shown in Table 4.…”

Combined Natural Convection and Surface Radiation Inside Vented Triangular Enclosure - An Experimental Study

“…With increase in the pitch angle, the number of cells reduced, thereby reducing the heat transfer. Anderson et al [5] determined the heat transfer coefficient for various aspect ratio in an attic shaped enclosure. They suggested a correlation for Nusselt number in terms of the Grashof number as well as the aspect ratio of the attic shaped enclosure.…”

Influence of presence of inclined centered baffle and corrugation frequency on natural convection heat transfer flow of air inside a square enclosure with corrugated side walls

“…But no significant changes in the overall heat transfer rate occur for different positions of the baffles. Anderson et al [11] experimentally demonstrated that the use of a single baffle could be examined as a possible low cost means of suppressing heat loss by natural convection in an attic shaped enclosure. Authors found that the heat transfer coefficient changes with increasing baffle length.…”