Forum discussion
NC-2009 EAp2: Minimum Energy Performance
Time Set Point Not Met Tolerance is 0.2°C ( ... DOE had specified a tolerance of +-0.5F for this...energyplus has a default of 0.2 degC). Am I justified in relaxing this tolerance on a system that obviously cannot respond to fast and so accurately to flux in room temperature? Increasing the "Capacity" of the system will not fix this.
Should I then relax the tolerance on the baseline heating system also?
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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?
Michael Tillou
Director of Energy ServicesCannon Design
52 thumbs up
September 30, 2010 - 10:24 am
It is generally considered proper to keep this type of variable the same in both your proposed and baseline models if it generates an increase in the proposed building energy performance. The reason is that the rating methodology does not explicitly address how to make the adjustment. You could submit an exception calculation to claim the increase in energy performance so that the methodology, justification and savings can be verified by a reviewer. If the adjustment decreases the performance of the proposed design then I usually just include a sentance or two in the project narrative explaining what I have done and commenting that it negatively affected the results.