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?

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Forum discussion

NC-2009 EAp2:Minimum Energy Performance

CCHP Modeling

Consultant ERM Apr 20 2016 Guest CCHP System modeling Project Location: Japan My project is provided by CCHP system which owned by third party, the CCHP has two gas generators, one heat recovered gas absorption chiller, two normal chillers and two boilers. 1)chilled water loop: absorption chiller + normal chillers, 100% chilled water is supplied to our Project A, 2)Hot water loop: absorption chiller +boilers ; 100% hot water is supplied to our Project A; 3)Recovered Heat from generators: about 53% is used for operating absorption chiller , other 47% is supply for another building B; 4)Electricity: electricity will be supplied to four buildings, included building A , B and C, D My question is : 1) shall we follow Appendix C and D in DES methodology since 100% chilled water and hot water is provided to our project ? 2) We use gas absorption chiller in the modelling since it has chilled water and hot water, but we found we can't use recovered heat from generator by directly connect to genertor since gas absorption chiller only has one hot water loop, so we abstracted recovered heat energy from gas consumption, is it accpetable?

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Mon, 04/25/2016 - 19:28

If you are following Option 2 then yes you use Appendix C and D. It sounds acceptable as long as your calculations account for the combustion efficiency and any other factors in the determination of the recovered heat contribution.

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