radiator calculations

[MP plumb]

hi,

Can you please break down how to do rad calcs. I done them a few years back at college but paperwork is lost.


i dont want to use one of the web sites as i need it to be accurate as poss.

thanks

 

[SimonJohns]

You need to work out volume of room

U values of walls

Floor construction

Ceiling construction

Or. Invest in a mears gauge

 

[PlumbBobBob]

best way to do it without using online calculators is as simonjohns says get a mears gauge.

 

[MP plumb]

thanks for the replys, i know i can use a mears calc and i know i need to find what simonjohns suggested, but there is a way to be accurate to the 'tee'! i was taught it ages ago but my memory is failing me!

 

[Billy Bob Bob]

Clair buy a mears it will be spot on trust me

 

[dancinplumba]

volume, air changes, temp of room, m2 of each surface, u values, glazing, heat gain/loss
av forgot calc tho too

 

[dancinplumba]

then add 10% for rapid heat up ??

 

[MP plumb]

thanks for the help...

i beleive a mears is ok for one room, or a small house but this is for a big job in london, and the last thing i want is for the client to come back saying the room isnt hot enough, and the complaints fall back on me!

 

[tamz]

Big room big rad. Small room small rad.

Get yourself the Stars program from Stelrad
Stars App | Heat loss calculator for any room
Myson used to have a free download called heatloss manager which you will find if you look for it
Barlo (Quinn) do one too.
Or just buy a mears calculator
Mear's Calculators

 

[Mike Jackson]

I've found that mears tend to oversize so if your competing on price it can lead to you being uncompetitive. I've not got the faintest idea where my course notes are and that is the last time I calculated a heat loss longhand. Out of college it was mears all the way until PCs appeared on the market and the first version of STARS came out (which you had too pay for). Since then it's been quick calc on site - mears. Full system - software. I'm looking for a decent app for the iPad now so that I can use it for everything.