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

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?

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?

View answers »

Forum discussion

CS-2009 EAp2:Minimum Energy Performance

airflow control in a reference building

In our proposed building we have CAV ventilation system which at night (when there's noone in the building) will provide 50% of the designe airflow rates. That's why for the simulation purposes in the model we marked that airflow control is "scheduled" (100% during the day, 50% at night). I would like to ask how in this case reference ventilation system should be modeled? Our reference building system is VAV (7). What should be the airflow control in the reference VAV system: proportional, constant or scheduled like in the proposed building?

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

Mon, 11/25/2013 - 16:33

Your project must comply with all of Section 6.4.3 since it is a mandatory provision. Based on your description your proposed system does not comply with a few of the provisions in this section. The baseline is modeled identically.

Tue, 12/10/2013 - 11:57

Thank you Marcus. I have one more question regarding Section G3.1.2.10 "Exhaust Air Energy Recovery" – it is not clear to me when should we include energy recovery equipment in the baseline model. The section states that “Individual fan systems that have both a design supply air capacity of 2400L/s or greater and have a minimum outdoor air supply of 70% or greater of the design supply air quantity shall have an energy recovery system […]”. My question is: should we compare these guidelines to our proposed or baseline model? Do we have to include energy recovery system in the reference model if there is a minimum air supply of 70% in the baseline model or if there is a minimum air supply of 70% in the proposed model?
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 12/10/2013 - 16:40

The baseline.

Add new comment

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