00:02
Okay, so we have a person standing in a room and we want to figure out the rate of the radiation heat transfer between the person and the room.
00:11
So we're given a temperature, an average temperature of the room of 22 .21 degrees celsius and we're just changing that into the units of kelvin as the standard units by adding 273 .15.
00:29
So you get 295 .36 kelvin.
00:33
Then we're given the area of the person 1 .54 meter squared.
00:40
The immissivity of 0 .95 and then we're given the temperature, the average temperature of the, the average temperature of the person is 30 .49, which changing into kelvin is 30 .3 .65.
00:58
Okay, and so we want to figure out that rate that is going to be, so the heat per time, and so that's going to be equal to the emissivity, which we're given times the stefan boltzman constant, times the area of that person, and then t of the person to the fourth power, minus t of the room to the fourth power.
01:43
And so we have all of that, and we can just go ahead and plug it in...