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 :

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?

Can I claim exterior lighting savings for canopy lighting even though a baseline model cannot include shading elements?

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?

View answers »

Forum discussion

NC-2009 EAp2:Minimum Energy Performance

EQUIPMENT CAPACITY OVERSIZING

I AM BEGINEER IN THIS FIELD. I HAVE A LITTLE DOUBT ABOUT EQUIPMENT CAPACITY OVERSIZING. I JUST WANT TO KNOW THAT, IN WHICH PART OF THE HVAC SYSTEM (IN BASELINE CASE) EQUIPMENT CAPACITY OVERSIZING DONE. IS IT AHU'S, VAV'S, UNIT HEATERS ETC???...ANY SUGGESTIONS....THANKS IN ADVANCE

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 Marais.Jean
Jean Marais
b.i.g. Bechtold DesignBuilder Expert
LEEDuser Basic Member
581 thumbs up

Fri, 11/09/2012 - 07:06

Very good question. Ideally all the systems, but if I were a reviewer, I would only look at the fan(s), chiller and boiler sizing. Here the sizing has the greatest impact on efficiency. If your coil is oversized, it may only impact on the pumping power. Pumping power inturn is very roughly estimated as no pressure drop in the piping is required to be dynamically simulated in the simulation. For the baseline pumping power is a function of mass flow. Electrical equipment is also not that critical in my opinion. Most softwares are limited in what they can actually size, by internal model assumptions. Anyone else?

Fri, 11/09/2012 - 08:22

thanks sir. your comment really help me. I little bit wondered when i listen from my colleague that, oversizing can be done at system level or zone level but not at both. according to me, system level is what we can say it a source which generate a medium for HVAC it may be include but not limited to boilers, chillers etc but i am not confirmed about zone level, it might include fans or else. So, according to you can we oversize these all parts by 25 and 15 %?? Any thoughts?????? +++++ can you please give me more info on zone level equipments oversizing?
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Fri, 11/09/2012 - 15:22

Correct it can't be done at both the system and zone level. In general it is done at the zone or the plant level, usually the zone level. Again it can't be at both.

Add new comment

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