Convective Heat Transfer Coefficient Of Glass. Convection heat transfer coefficient the formula for heat transfer is. 122 q conv ha t t s where q conv is the convective heat transfer rate h is the convective heat transfer coefficient in units such as wm 2 k or btuhft 2 r a is the surface area of the object being cooled or heated t is the bulk temperature of the surrounding fluid.
Under still air conditions the combined heat transfer coefficient at the inner surface of a vertical window can be determined from. Low speed flow of air over a surface. Where t g glass temperature in k t i indoor air temperature in k ε g emissivity of the inner surface of the glass exposed to the room taken to be 084 for uncoated glass and σ 567 x 10 8 wm 2 k 4 is the stefa boltzmann constant.
Determine the convective heat transfer coefficient for the top surface of the furnace considering natural convection in place of forced convection.
Q2 a determine the convective heat transfer coefficient for the top surface of the same furnace considered in q1 considering natural convection in place of forced convection. The basic equation for the rate of convection heat transfer is known as newtons law of cooling. The rest of the radiation is partly absorbed by glass interior absorptance depending on glass thickness which slightly decreases the thickness wise temperature gradient and thermal. Convection contact heat transfer as well as about 46 of the radiation in a tempering furnace affect glass surfaces from which heat is conducted deeper into the glass.