See all forum discussions about NC-2009 EAp2
 Subscribe to new posts about NC-2009 EAp2 Post a new question aboutNC-2009 EAp2
See LEEDuser’s guidance on NC-2009 EAp2»
FAQs about EAp2 :

The project is built on a site with existing exterior lighting installed. How should this be accounted for?

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?

Is it acceptable to model a split-type AC with inverter technology compressor as a heat pump, like modeling VRF?

Can the Trace 700 'LEED Energy Performance Summary Report' by uploaded to LEED Online in lieu of the Section 1.4 tables spreadsheet?

A portion of our building envelope is historic. Can we exclude it from our model?

Which baseline HVAC system do I use if my building has no heating or air conditioning?

For an existing building, do I need to rotate the model?

Our project has a diesel backup generator. Should we include it in our energy model?

Our project has a large process load—75%. Despite our efforts to make an efficient HVAC design, the cost savings are minimal. What can we do to earn this prerequisite and be eligible for LEED certification? Is there any flexibility in how we model the p

Can SHGC be higher in the proposed than in the baseline model?

Our process load is higher than 25%. Do we have to justify that?

Do I need to justify the electrical and fuel rates I am using in my model?

Our local code references ASHRAE 90.1-2010. Should I use that for my documentation, or 90.1-2007?

View answers »

Forum discussion

NC-2009 EAp2:Minimum Energy Performance

HVAC system - Proposed model - Part of system provided

Hi, I have a doubt related to how to model the proposed system when only part of the system is provided for some areas. In a specific project, most of the areas have the HVAC system already designed. It consists of a water-cooled VRF system. However, in some areas, it was provided only the condensing water, not the evaporators. My question is: how should I model the HVAC system in the proposed model in these areas, for which the terminal units were not provided? Another scenario that I'm not sure about is: if I have a 10-story building, for which the HVAC system has been designed only for 8 stories, should I model the 2 other stories as having no HVAC system? Thanks!

0
Post a reply

You rely on LEEDuser. Can we rely on you?

LEEDuser is supported by our premium members, not by advertisers.

Go premium for $15.95  »

Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Thu, 10/31/2013 - 15:48

If the system in some areas has not been designed it must be modeled identically to the baseline. See Table G3.1-1 Proposed (c).

Thu, 10/31/2013 - 16:51

Hi Marcus, In the first example I've mentioned, in which part of the system is already defined, what would be left to de modeled "exactly as they are in the baseline building"? The fans? In the second example I have another doubt: According to Appendix G, the HVAC system for the baseline model would be #8, which consists of a chiller plant. In my proposed case, in the 2 stories for which no HVAC system has been specified, should I model the HVAC system as being #8 or according to the requeriments of Table G3.1.1.A, depending on the area and number or stories of the areas which have no HVAC system?
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Thu, 10/31/2013 - 17:22

If you can show that the installed piping will be used by the owner or a future tenant (lease agreement) then you could model a minimally efficient VRF system. If not then the entire system must be identical to the baseline. Identical to the baseline. You do not get to change the baseline based on the smaller space.

Thu, 10/31/2013 - 20:10

First example: Understood! Second example: So, if I have a Baseline Building which uses Baseline system #8 and, for example, 50 m2 of area in my proposed building which doesn't have an HVAC system designed to it, I must model the HVAC system for this area as Baseline system #8?
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Fri, 11/01/2013 - 15:42

Yes

Add new comment

To post a comment, you need to register for a LEEDuser Basic membership (free) or login to your existing profile.