Forum discussion
NC-2009 EAp2: Minimum Energy Performance
In case you have not seen this relatively new guide I would highly recommend it to help with your modeling issues.
ANSI/ASHRAE/IES Standard 90.1-2010 Performance Rating Method Reference Manual
http://www.pnnl.gov/main/publications/external/technical_reports/PNNL-25...
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A portion of our building envelope is historic. Can we exclude it from our model?
For an existing building, do I need to rotate the model?
Our process load is higher than 25%. Do we have to justify that?
Our local code references ASHRAE 90.1-2010. Should I use that for my documentation, or 90.1-2007?
Can mezzanines open to floors below be excluded from the energy model?
How do I provide a zip code for an international location?
For a project outside the U.S., how do I determine the climate zone?
For a project outside the U.S., how do I determine the Target Finder score?
Do hotel rooms need automatic light shut-off control?
How commonly are the 90.1 mandatory compliance forms submitted as part of EAp2/EAc1?
The Section 9 space-by-space method does not include residential space types. What should I use?
Can the Passive House Planning Package (PHPP) be used to energy model for LEED?
Which baseline HVAC system do I use if my building has no heating or air conditioning?
Our project has a diesel backup generator. Should we include it in our energy model?
Can SHGC be higher in the proposed than in the baseline model?
Santiago Velez
ASHRAE BEMP HBDP - LEED GA, Building Performance ConsultantZonda
20 thumbs up
August 22, 2016 - 7:26 pm
Wow. Very helpful. Thanks for sharing!
Jean Marais
b.i.g. Bechtold DesignBuilder Expert832 thumbs up
August 23, 2016 - 4:44 am
Hi Marcus, could you ask the chaps to improve Figure 3 (p 2.8) to include the <50 hrs difference in UMLH between the UMLH proposed and UMLH baseline boxes in the flow diagram? I don't have a direct email.
Cheers, Jean
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5912 thumbs up
August 23, 2016 - 9:44 am
Hi Jean,
This document is based on 90.1-2010 which eliminated the <50 hours. That is why it does not show in the diagram.
Jean Marais
b.i.g. Bechtold DesignBuilder Expert832 thumbs up
August 23, 2016 - 11:43 am
wooah...okay, that IS a heads up, thanks.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5912 thumbs up
August 23, 2016 - 12:02 pm
Where the modeling parameters did not change the specific guidance in this document should apply to 90.1-2007 models. Even if it did change much of the guidance would still help folks understand how to model many of the baseline requirements. Just need to keep an eye out for the changes in 90.1-2010.
I already referred someone on LEED User to the part where it tells you how to model the fan controls for a system 8. Saved me a bunch of time!
Santiago Velez
ASHRAE BEMP HBDP - LEED GA, Building Performance ConsultantZonda
20 thumbs up
August 23, 2016 - 12:08 pm
Good to know. I noticed some big changes in baseline lighting, involving what looks like complex (and time consuming) area calculations for daylighting controls.
How much more time than 2007 PRM would you estimate? 10%-20%?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5912 thumbs up
August 23, 2016 - 12:18 pm
I had not thought of it that way. But I suppose you are right that it will take some more time. I think once you get over the learning curve the extra time will be minimal.