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 :

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

NC-2009 EAp2:Minimum Energy Performance

CHP-generated electricity

Dear all, we are working on a project which be supplied from a DES with CHP. The source of CHP is not renewable energy but natural gas. We've done the energy modeling and calculated the CHP Electric Output according to the Option 2 in the DES Guidance for LEED 2009. Our question is, can the CHP-generated electricity be substracted from the total electricity consumption of the building? If yes, how can we record it in Leed-Online-Form. As far as we know, only if the output-electricity is generated from renewable sourece, it can be substracted or compensated as a part of total electricity consumption. We would greatly appreciate if anyone can explain this question. best regards,

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 msommerman_1
Khaled Fouda
Design Engineer, LEED AP (BD+C)
Energy Concepts
LEEDuser Basic Member
5 thumbs up

Mon, 06/06/2016 - 15:17

Hi Yue Nie, You can record your savings as Exceptional Calculation Method following "Methodology for Modeling Combined Heat & Power for EAp2/EAc1 in LEED 2009" that can be found on: http://www.usgbc.org/resources/methodology-modeling-combined-heat-amp-power-eap2c1-leed-2009 And by following that you should upload your "hourly based" calculations to LEED Online showing the following: A. The amount of (kWh) generated - And cost saved. B. The amount of heat recovered - And cost saved. C. The amount of gas input to your CHP units - And cost of expenses. Usually the $/therm rate at point C. is cheaper than the normal boiler rate used at point B. I have filed the three points above as separate ECM calculations before, just to make it easier for the reviewer to understand my calculations. I hope this helps. Regards,

Mon, 06/06/2016 - 16:32

Does the building that you are modeling consume the electric energy that is produced by the CHP system directly?

Tue, 06/07/2016 - 07:42

Hi Khaled, thank you very much for the advice. As I see, the document "Methodology for Modeling Combined Heat & Power for EAp2/EAc1 in LEED 2009" can only applies to on-site systems, whose CHP inside project site boundaries. In our project, the CHP is in the DES-Center and outside the project site boundary. Actually we've performed an energy modeling according to the document "Treatment of District or Campus Thermal Energy in LEED". But I would like to try to record the CHP-generated electricity in the EXCEPTIONAL CALCULATION MEASURE SUMMARY by Leed-Online. Thank you very much! Best regards,

Tue, 06/07/2016 - 07:59

Hi Francesco, yes, the CHP-generated electricity is consumed by more buildings, and our project building is one of them in the whole campus. thanks and best regards,

Tue, 06/07/2016 - 12:50

Hello, have you considered the document "Treatment of Scandinavian District Energy Systems in LEED"? https://www.sgbc.se/docman/leed-2014/438-treatment-of-scandinavian-district-energy-systems-in-leed-v1-1-2014/file It deals with CHP as well. Regards
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 06/07/2016 - 13:40

The Scandinavian DES can only be used by European projects so not sure if it applies or not.

Wed, 06/08/2016 - 06:55

Thanks very much Francesco, Marcus, yes our project is in Europe, we haven't used the "Treatment of Scandinavian DistrictEnergy Systems in LEED", but followed the document "Treatment of District or Campus Thermal Energy in LEED".

Add new comment

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