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

District Energy System: Virtual Rates & Point Restriction Confusion

Default Avatar
Luigi Festa
MEP
Highland Associates
LEEDuser Basic Member
0 thumbs up

I have a project that is using a district steam system; modeled under the streamlined path. I used the reference "Treatment of District Energy or Campus Energy in LEED v2 and LEED 2009 - Design & Construction". My questions are as followed.

1. Does my virtual fuel rate for the district system seem invalid?

I calculated the virtual fuel using the equation in the reference. The value obtain from the calculation for the district steam rate is $43.3 / therm, which seems very high for a rate. The minimum energy performance calculator flags my value and asks for a narrative justifying the value.

The virtual rates used to determine the district steam rate are below:

     Virtual Gas Rate: $0.93/therm; Virtual Electrical Rate: $ 0.1387/kWh

     Calculation Method: District Steam Rate = ($ 0.93/therm)*(1therm/100 MBtu)*(1.81) + ($0.1387/kWh)*(3) = $0.433/MBtu = $43.3/Therm

2.  how do i determine the number of points i earned ?

The table just offers the cap, but does not offer the point distribution for the district system, do i just interpolate for the points. The minimum energy performance calculator downloaded from USGBC does not offer any information for the point distribution from the DES

 

Any help would be deeply appreciated.

-Luigi Festa

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

Wed, 01/17/2018 - 17:42

1. The MBTU in the DESv2 is million BTU. So your conversion should be 1 therms/0.1 MBTU. 2. You use the same point thresholds as any other project depending on whether it is an existing or new building.
Default Avatar
Luigi Festa
MEP
Highland Associates
LEEDuser Basic Member
0 thumbs up

Mon, 02/26/2018 - 13:28

what do the following impact if they do not impact the points threshold? "Treatment of District or Campus Thermal Energy in LEED" states EAc1 point restrictions using energy model DES option 1 has a points cap up to 10 pts DES option 2 has a points floor of 6 pts Thank You Marcus -Luigi Festa          
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Mon, 02/26/2018 - 17:18

The threshold is the percentage savings you have to demonstrate to earn a certain number of points. These thresholds are part of the Optimize Energy Performance credit and do not change if you are applying the DES v2. See -https://www.usgbc.org/credits/new-construction/v2009/eac1   The cap limits option 1 to up to 10 points. The threshold associated with that will vary depending upon whether it is existing or new or a combination. The floor mean you can't pursue option 2 unless the overall savings are at least equal to the threshold associated with 6 points.
Default Avatar
Luigi Festa
MEP
Highland Associates
LEEDuser Basic Member
0 thumbs up

Mon, 02/26/2018 - 17:54

Thank You Marcus

Add new comment

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