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2014-09-23 14:55:39 -0500 | commented question | Getting infiltration rates right? You could, but ultimately all of those models will end up with some parameter representing the flow resistance/discharge coefficient/ELA/whatever of the building that's not easily derivable or measureable. In most infiltration models it's a multiplicative constant. I think the fact that all those models have a parameter that's unmeasureable within plus or minus 50% is more important than which model you select. |
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2014-09-23 13:50:19 -0500 | asked a question | Getting infiltration rates right? I know this forum is mostly for energy modeling but some of us have to model existing buildings, and when you model existing buildings sometimes you have to measure them. So - how do you determine what the ACH from natural infiltration is in a leaky old building? It could be 0.6; it could be 1.6. What methods do you use? Utility bill calibration seems to be about the best the industry can do, but I'd like to know if anyone has better ideas. |
2014-09-09 17:41:01 -0500 | answered a question | Calculating 3D Thermal Bridges I don't know of any good freeware solutions. If someone created a plugin that could turn Sketchup geometry into a matrix of material properties, it would be pretty easy to implement something in MATLAB. Interested? |