Time to heat up a certain volume of air in an enclosure

[winghoe_tan]

Hi

I have a need to estimate the power of a heating element required to heat up a certain volume of air in an enclosure within a certain time. I have been using Q=mcT to do this estimate. I understand that using this formula entails making some assumptions.

Is one of those assumptions being that the heat source is evenly distributed throughout the whole volume? If so, the Q that I get from the equation would be much lower than is required. My heating element only occupies a certain area. With this area, is there a rough way of estimating the power of the heating element required?

[Cragyon]

There's a bunch of heat transfer equations and calculators here: https://www.engineersedge.com/heat_t...le_content.htm

Check out "Heat Loss Through a Wall Equation and Calculator just substitute heat transfer numbers for window https://www.engineersedge.com/heat_t...ndow_13824.htm.

[sharvilohiya]

As air warms up, the molecules start to vibrate and bump into each other, increasing the space around each molecule. Because each molecule uses more space for motion, the air expands and becomes less dense (lighter). ... The opposite effecthappens when air cools.