John Stumbles wrote:
On Thu, 14 Sep 2006 11:02:50 +0100, HLAH wrote:


"Dave Fawthrop" wrote

Put one twice the size you think would be right, and fit a TRV.
--
That's pretty much our plumbers strategy. It makes sense to me.

Price of steel these days it's better to calculate it and get it right.
Often I've been suprised how small (and sometimes how large) a rad needs
to be for a given room.

TBH I suspect that the cost difference between my largest
"guesstimated" rad wouldn't be vastly different to the ideal size, so
that's not my main motive - would just rather keep it neat and not clog
up the room with more hardware than required.

Anyone know of a Noddy guide to calculating U-values? Once tried doing
it from first principles before, without a software calculator, and
came unstuck!

For the purpose of rad sizing/U-value calcs, does it matter whether the
sloping area is considered as "wall" or "ceiling"?

(BTW floor area is (IIRC) something like 3.5 x 3m (I'm not at home now)
but the flat area of the ceiling is probably half that?)

Thanks
David