00:01
Now in this question, imagine you have a wall, right? let's say you have a wall like this.
00:06
And this is a wall.
00:07
And this wall has a thickness, which i could do.
00:10
Which is according to the question is something 25 centimeters thick.
00:16
Suppose it has a semiconductor deep copper, right? and the inset of the world has, i mean, the one set, the inner surface, sorry, not the inner surface of the wall has the temperature, which is 20.
00:30
7 celsius degrees.
00:32
Okay, so this side has a temperature, 27 says degrees.
00:37
On the other side here, it has a temperature which is 40 degrees.
00:41
So now 44 celsius degrees, okay? so i will call this t .l, this t .h, right? and there's a temperature gradient, which is established across the world, obviously.
00:52
You can easily work out temperature gradient, right? it's just t .h minus t .l.
00:57
Divided by d.
00:59
Now, here comes the point.
01:04
This convection with ambit air at 406 degrees, and that will actually take away the heat exchange coefficient, which is 8 watts per meter square cabins, right? at a watts per meter square cavins.
01:22
So the convection with the ambitial square cavins.
01:28
Take away some heat, right? and then the solar radiation, you know, the solar radiation come in and that would give this, give this world some heat, right? and that is the incoming, let me say the incoming energy, actually.
01:46
I should not use the p, i want to use a different quantity.
01:52
I would like to call it actually p, okay? and that according to question is actually something like 500 watts per meter squared, okay? so per meter squared actually receives, this world receives too much energy, right? at the same time, you know, actually how much energy be taken away? i'm actually by the wind, well, that would be 8 watts divided by meter squared kelvin, okay? so the wind will take away energy per, per, per second, actually second, sorry, not a second, but kevin, right, for kevin will be edwards, right? meanwhile, you know, because this war, canada has a temperature, so it's going to rate eight, right? so you're already eight, how much energy? well, it's going to begin by sigma, which is a different constant times the temperature of th...
