Question

concept question C14-6 in Williams, which asks you to find the energy radiated per second by a space heater whose absolute temperature is doubled, requires you to make an approximation. In order to use the following equation:

????=?(?41−?42)Inet=σ(T14−T24)

you need to assume that the radiator does not absorb any radiation from its surroundings. How valid is this assumption?

If the space heater's element is at 750 degree C (peak blackbody radiation colour in orange), and the room is at 9 degree C, calculate the percentage difference in net radiation intensity from the element when considering and neglecting the room's temperature.

Answer 1