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 :

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?

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?

View answers »

Forum discussion

NC-2009 EAp2:Minimum Energy Performance

District Cooling - Mandatory Compliance

Default Avatar
Marina Andrade
Sustainability Consultancy Services
Cushman & Wakefield
LEEDuser Basic Member
11 thumbs up

Hello, I would like to know if the District Cooling System needs to comply with ASHRAE mandatories. I have read the DES Guide and seem like choosing the Option 2, the project needs to comply with the Standard. However I'm working in a project that the system is existent. Does the upstream system needs to comply with the ASHRAE mandatories (even the exist system)? On the same project, they are planning to install a renewable energy system to supply energy for the project (the energy will be supplied only for the project). Can We use the system to account energy efficiency for the Propose building in the both option (Option 1 and Option 2)? As the renewable energy system supply energy only for the project, even though is outside the LEED boundary, does the system comply with the EAc2? 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, 10/18/2012 - 14:59

Correct the DES does not need to meet the minimum efficiency requirements in 90.1. Counting the renewables for EAc1 and EAc2 is independent of the application of the DES. There are often exceptions granted for renewable supply from outside the LEED project boundary. There should be a few interpretations on the subject. For example, landfill methane piped to the facility or a PV array on a campus.
Default Avatar
Marina Andrade
Sustainability Consultancy Services
Cushman & Wakefield
LEEDuser Basic Member
11 thumbs up

Tue, 10/23/2012 - 10:53

Hi Marcus, thanks for your help. This project has district cooling and heating system. According to the ASHRAE Standard, the Baseline system is the system 3. According to the Treatment of District or Campus Thermal Energy in LEED Option 1, the Baseline and Proposed model is a 4-pipe CV AHU. From what I search about this system, it is a constant volume single duct system with pretreated outdoor air. Am I right? The project has an Energy Recovery System to treat the air before supplied to the zone. Sould I consider this system in the Proposed model, even though the air is already treat in the district system?
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 10/23/2012 - 14:18

Your baseline system only needs preheat if the proposed system has it (see G3.1.2.3). The rest of the system description sounds right. You almost always model the proposed as designed. In the baseline you model energy recovery according to G3.1.2.10. Not sure I understand your last statement about the air already being treated in the district system.
Default Avatar
Marina Andrade
Sustainability Consultancy Services
Cushman & Wakefield
LEEDuser Basic Member
11 thumbs up

Tue, 10/23/2012 - 16:35

The proposed bulding has no preheat coil and fan system capacity is less than 2400 L/s and minimum supply air is less than 70%, so I don't need to model these system in the Baseline. I'm just confused on how to model the 4-pipe CV AHU, those a 4-pipe fancoil unit meets the requirement? Thanks.
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 10/23/2012 - 17:15

Yes a 4-pipe fancoil unit with a single speed fan is the same thing as a 4-pipe CV AHU. Let me know if I misunderstood your question.
Default Avatar
Marina Andrade
Sustainability Consultancy Services
Cushman & Wakefield
LEEDuser Basic Member
11 thumbs up

Tue, 10/23/2012 - 18:01

Oh no. You help me alot. Thanks you very much Marcus!

Wed, 10/24/2012 - 16:04

I have been reading this discussion and it has been very helpful in clarifying the procedure, but I have another question about fans and their power allowance, I thought that thsi calculated allowance concerned baseline fans, but somebody told me that this was the power allowance for the project fans as well, is it right?, thank you
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Wed, 10/24/2012 - 16:53

The proposed fans are modeled as designed and do not use the same methodology as the baseline fan power calculation.

Tue, 11/06/2012 - 07:03

Thanks for above discussion. The baseline fan energy calculated based on G3.1.2.9 is including supply,return, exhaust & relief fans. As our project proposed design having only supply fan (no return or relief fans), whether the baseline fan energy also need to be reduced by any calculation for supply fan alone.
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 11/06/2012 - 14:38

No it is not reduced. Model the Proposed as designed, model the baseline according to G3.1.2.9. There are fan power adjustments for the baseline depending on components of the proposed design in Table 6.5.3.1.1B but this is part of the calucation under G3.1.2.9.

Add new comment

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