Temperature Gained?

[The Viking]

OK guys (gals?),

Please feel free to laugh at me for this one, it is late, my brain is mush and I can't find my trusted rule of thumb book... :mad:


What will the temperature rise be in 1m2 of air if 1 watt of heat is added to it for 1 hour?
(Assuming no losses or other heat transfers occur and that we start with dry air at 20ºC)


I will now go and collect my free bus pass, get my slippers on and complain about the youth of today.

[frank]

Assuming you mean 1m3

Straight forward Viking..

1 Watt = 1j/s
1 hour = 3600 secs
so 1 Watt for 1 hour = 3600joules or 3.6kj

The mass of dry air at 20c is 1.205kg

Specific heat of air is 1.22kj/kg, so

Using the heat transfer formula Q = mass x c x (t1-t2) we can transpose to find the dt

3.6/(1x1.205)/1.22 = dt

dt = 2.4488K

Temperature rise = 2.45 degrees C

[mad fridgie]

Typo I think frank!
3600joules = 3.6 Kj (not kw)

[The Viking]

Thanks Frank,
You are of course right m3 it is.

And thank you for the formula.

:cool:

[frank]

Typo I think frank!
3600joules = 3.6 Kj (not kw)
Spot on MF...wine kicked in lol
I'll have to recalculate tomorrow... Beds calling☺

[frank]

Correction made ☺

[The Viking]

Cheers Frank,

You are a true gentleman.

:cool:

[nike123]

Spot on MF...wine kicked in lol

You need to retune to vine from beer!;)

I telling this from personal expirience!:)