andyro wrote: ↑
Sun Sep 06, 2020 4:20 am
While I can't speak for Graphisoft, the detailed consideration for vertical (by structure) thermal bridges and lateral (psi) thermal bridge simulation and addition of length parameters (you model every lateral detail, and provide a length multiplier in the structures list view), as well as window installation psi values, appears that EcoDesigner's developers were in fact aiming to align 100% with PHPP. In fact I wrote a blog on this here: https://www.thomsonarchitecture.ca/2020 ... ive-house/
I have yet to complete my PHPP course of study and exam, but it seems GS is 90% of the way towards a completed tool. The PHPP export works (tested to 9.6) but is partial, and Exterior Envelope Area needs to be calculated in 2 ways, for its own calculation methods, but also for PHPP export. This could considerably reduce the PHPP input process if export was consistent and reliable, not to mention well documented.
Andy, I completely agree that it would reduce a lot of input (not 90% however, there is significant input required regarding the shading and heating, I've not checked U-Value and thermal conductivities of elements) however, one of the main reasons that PH is a safer standard is because it uses external dimensions, thus over estimating the heat loss. then, by calculating areas externally, the thermal bridge PSI values tend to be negative, which is essentially a correction factor for overlapping elements.
Due to this methodology not being followed by Graphisoft, it makes the PHPP not valid and requiring complete recalculation manually or by another means.
I REALLY wish Graphisoft would either resolve this, or ever reach out to some PH professionals (THIS IS ME OFFERING MY SERVICES) to make this work as it's so close, better than having to remodel in Sketchup (in designPH) and would make it so much easier for designers to understand how their designs are likely to perform.
EDIT: I'm now reading through your blog post with glee. You've obviously used ED more than myself (being a lowly AC Solo user) and having the frustrating time limits of a very small practice. I'm hoping to get some time in experimenting the ED properly whilst working through your blog post in a hope that it provides some useful insight.
using ArchiCAD 24 on a Mac usually
Passive House Designer & Architectural Technician
Leeds Environmental Design Associates