U-value calculation!

rob w

Hi,

I need to find the u - value for a ceramic tile, 150mm thick, with a thermal conductivity of .80 w/m2-k.

i did my calculation out, but got a thermal transmittance of 5.34w/m2-k.

I just dont know if its correct, seems wrong to me, but im only new to this, can anyone tell me if its right or not?

Cheers:D

Outkast_IRE

U value is w/m2k
but thermal conductivity is just w/mk as area doesnt come into it only thickness

rob w

Outkast_IRE wrote: »

someone jump in to correct me here but i think the correct figure is probably 53.3
As i said im not sure but you might of went wrong converting the mm to M
150mm thick tile is .015m.
I think you may of taken it as .15
also final unit of a U value is w/m2k
but thermal conductivity is just w/mk as area doesnt come into it only thickness

Yeah sorry my mistake with the w/m2k, but 150mm in metres is 0.150!!

Outkast_IRE

rob w wrote: »

Yeah sorry my mistake with the w/m2k, but 150mm in metres is 0.150!!

ya i had a brain fart moment , yup your calculations is right as far as i know i knew it as soon as closed internet explorer , been studying thermofluids all morning so brain is melted from math.

rob w

Just seemed a bit high and i wasnt sure, thanks for the quick reply!!

Outkast_IRE

but isnt 150mm very thick for a tile thats a 15cm thick tile

rob w

haha, yeah now that i think of it, its a bit thick alright!

Its a question for college, "select a material and find u value,150mm thickness".............should have probably chosen something else, would make a bit more sense!!