Doors in SBEM

[ecoboost]

Just wondering what peoples opinion on adding doors to rooms in SBEM. I have always left them out but a colleague who does some work for me says they should be modelled. Is he correct?

[Complex Potential]

I'd say that external doors should be modelled but I never bother with internal ones.

[JohnLloyd]

If you're only doing a Part L or EPC assessment then it's not required to draw internal doors; it says that in one of one of the documents somewhere (NCM Modelling Guide??).

However, if you're doing a dynamic simulation with MacroFlo for thermal comfort / overheating, adding internal doors and giving them an appropriate crack flow coefficient can give a noticeable increase to ventilation rates and air movement through your building.

[ecoboost]

Thanks. I'm only interested in SBEM, always leave out internal doors, just wasn't sure about external. Assume it is only modelled for the uvalue?

[JohnLloyd]

You must include all external doors because the Notional building needs to use the same external door positions. That goes for both glazed doors and solid.

John.

[Terence]

Just curious, but why wouldn't you model external doors? Have you previously discussed this with building control or your accreditation scheme?