Fixed air loss in Heat Loss calculation

RE: Fixed air loss in Heat Loss calculation

Krishnendu Paul — Fri, 20 Aug 2021 16:12:40 GMT

and the infiltration formulae implemented as below:

Regards,

Krishnendu

Krishnendu Paul — Fri, 20 Aug 2021 16:10:02 GMT

Hi James,

these below factors are considered while calculating Heat loss.

James Dawson — Fri, 20 Aug 2021 13:08:39 GMT

Thanks Krishnedu.

FYI - I am only looking at the zoned areas on the 3rd floor - so have just included two floors below and set them at same temps so no heat losses.

Krishnendu Paul — Fri, 20 Aug 2021 13:00:22 GMT

Hi James,

Many thanks for putting these queries forward, can you please share your project through the link here so that I can have a closer look?

Regards,

Krishnendu

James Dawson — Fri, 20 Aug 2021 12:46:10 GMT

I also wanted to query the infiltration loss.

Again this comes out slightly higher then when calculating by hand.

Same room - 27m2 at 2.8m room height - 0.5 ACH infiltration rate @ -3C external temp:

(27x2.8) x 0.5 = 37.8 m3/h

37.8 / 3600 = 0.0105 m3/s

0.0105 x 1.23 x 24 = 310W

Heat Loss calculation comes out as 341W

Any ideas where the additional loss is coming from?