Dear list,
I am working on creating envelope libraries for ASHRAE 90.1 2010, 2007 &
2001 code vintages.
I have a copy of ASHRAE 2010 standard and users guide, and am wondering if
there might be a general multiplier that could be used to back the
insulation levels as well as U values down to the 2007 and 2001 levels.
When I purchased the ASHRAE 2010 standard and users guide the ASHRAE rep I
spoke with mentioned that I might be able to use a multiplyer for this.
from ASHRAE 2007, but do not know if this 16% is actually the number or not
and do not have any assumed numbers for other vintages or values. My use
of this is for PCM modeling, sort of conceptual massing preliminary
modeling & climate studies so strict code compliance is not necessarily
required but would be preferred. I would prefer not to buy all of the
individual standards if possible so wonder if such a multiplier might be
reasonable. I would like to also do space type lighting codes & DHW (for
internal gains) as well.. If anyone has insight it would be appreciated,
and I also could share my finished work (in excel, energy plus and design
builder formats) with anyone who wanted it..
Best regards-
*Jeremiah D. Crossett*
Jeremiah,
Unfortunately, the envelope provisions, by construction class, did not increase in stringency linearly. By year in some cases a particular assembly increased relative to another, in some cases it did not change at all. So, unfortunatly,
There is no easy ( accurate ) answer. As for generalizations, most of the analysis, has been on the standard as a whole, and therefore includes all the chapters.
It seems, if you are creating a backwards tool, there are not too many assemblies, and only 3 editions to enter in the data.
As for purchasing the standard, its not a bad reference.
Sent from my HTC on the Now Network fdsrom Sprint!
----- Reply message -----
Leonard,
Thank you you have answered my question. I will just start with the 2010
version I have and buy the other standards if needed. The multiplier would
have been nice, but I understand the issue with it..
You might be able to help me with this one value> Would you know
what envelope changes where most common from 90.1 2007 to 2010?
Thanks
*Jeremiah D. Crossett*
Leonard,
Thank you you have answered my question. I will just start with the 2010
version I have and buy the other standards if needed. The multiplier would
have been nice, but I understand the issue with it..
You might be able to help me with this one value> Would you know
what envelope changes where most common from 90.1 2007 to 2010?
Thanks
*Jeremiah D. Crossett*
Hi Jeremiah, you might want to take a look at the Building Component Library (bcl.nrel.gov). The construction assemblies that NREL uses to approximate the ASHRAE standards are available there in OSM and IDF formats:
https://bcl.nrel.gov/search/apachesolr_search/Construction%20Assembly#q=Construction%2520Assembly%3Ffilters%3Dtid%253A127
The latest OpenStudio application allows searching for and downloading construction components from the BCL from within the application. The OpenStudio installer also includes Ruby bindings which can programmatically access the BCL. Finally, Alan Jackson has posted some Python scripts which can be used to convert the IDF files to INP format:
http://openrevit.com/2012/05/idf-to-inp-converter-for-nrel-bcl/?utm_source=rss&utm_medium=rss&utm_campaign=idf-to-inp-converter-for-nrel-bcl
Hope that helps,
Dan
There's also the E+ models created to evaluate the energy savings of
90.1... there are models for 2004, 2007, and 2010 for 16 building types in
all the climate zones:
http://www.energycodes.gov/commercial/901models/
WOW-
This is a great resource! Thanks for the info.
*Jeremiah D. Crossett*
WOW-
This is a great resource! Thanks for the info.
*Jeremiah D. Crossett*