Can someone just confirm that if i have a target air leakage rate i should input this (3m3/h/m2) at 50pa in to my MacroFlo data rather than in the Room Data and be careful no to put it in both. Any suggestions which one is easier for inputting this, room or MacroFlo.
Thanks
Mark
Target air leakage
-
Complex Potential
- VE Expert
- Posts: 467
- Joined: Wed Jan 09, 2013 11:57 am
- Location: Bristol, UK
Re: Target air leakage
Hello
It sounds like you are confusing 3 different types of input here.
- m3/h/m2 @ 50pa should be used when running compliance models (ie, SBEM or DSM Part L) and should be added on the Building Data dialogue box inside the VE Compliance module which then converts to an assumed AC/H rate for each room
- Macroflow allows for individual doors or glazing elements to be controlled as openings which allow air in from the facade. If you want to model detailed air leakage then you could potentially introduce a small amount per window/door via the Crack Flow Coefficient options but this is quite time consuming and difficult to get right (although potentially more accurate per room than the whole building method)
- Whole building method: this is by far the most popular method for doing "normal", non-compliance thermal models in apache. You add the infiltration rate to every room template in terms of a constant AC/H into the air exchanges tab. If you are at 3m3/h/m2 @ 50 pa then you will probably be around 0.1-0.15 AC/H average, although this is often debatable.
CP
It sounds like you are confusing 3 different types of input here.
- m3/h/m2 @ 50pa should be used when running compliance models (ie, SBEM or DSM Part L) and should be added on the Building Data dialogue box inside the VE Compliance module which then converts to an assumed AC/H rate for each room
- Macroflow allows for individual doors or glazing elements to be controlled as openings which allow air in from the facade. If you want to model detailed air leakage then you could potentially introduce a small amount per window/door via the Crack Flow Coefficient options but this is quite time consuming and difficult to get right (although potentially more accurate per room than the whole building method)
- Whole building method: this is by far the most popular method for doing "normal", non-compliance thermal models in apache. You add the infiltration rate to every room template in terms of a constant AC/H into the air exchanges tab. If you are at 3m3/h/m2 @ 50 pa then you will probably be around 0.1-0.15 AC/H average, although this is often debatable.
CP