On Sat, 31 Jan 2004 05:03:03 +0000, Will wrote:




I noted that the negative loss (ie gain) from upstairs to downstairs
via the floor/ceiling, whilst initially noted, then became shown as an
actual loss:-

Most of the radiator manufacturer calculator programs deal with
internal losses but not internal gains - they ignore them.

Generally though, the amount is small unless one has deliberately
large temperature differences between rooms.

For radiator sizing purposes it is probably better to ignore that heat
gain happens anyway and go for a more conservative approach.
Of course the radiator manufacturers sell a larger radiator as well.
Perhaps that's why they take this approach to the calculations.


..andy

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