FAQs about EAp2 :

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?

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?

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Forum discussion

CS-2009 EAp2:Minimum Energy Performance

the fan power of mechanical ventilation

Dear sir/madam, Per the Revised Section 1 4 Tables (Dec 2012), for Systems 9 and 10,the fan power=0.3*supply air flow rate(cfm). I have some question for you. 1) per 90.1-2010,for Systems 9 and 10,the fan power=0.3*supply air flow rate(l/s). so the units of the Revised Section 1 4 Tables (Dec 2012) is not consistent with that. 2) at one time, the review comments from GBCI said "all independent fan systems of the HVAC systems in the actual design must be modeled identically between the Proposed and Baseline models at actual equipment capacities". it means that the fan power of mechanical ventilation should be idencially with the actual design. But the Revised Section 1 4 Tables (Dec 2012) has required that fan power=0.3*supply air flow rate(cfm) . how should i do ? 3) for the area of mechanical ventilation, the actual design has no heating but ventilation. for the baseline modeling, must the heating for the Systems 9 and 10 be heated? Thank you so much! Regards, Tiantian Beijing,China

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Wed, 10/09/2013 - 20:31

1. The Revised Section 1.4 Tables are in IP units, not SI. The correct requirement from the IP version is 0.3 watts/cfm. 2. All fans in conditioned spaces are included in the baseline fan power allowance. Only fans in unconditioned spaces should be modeled identically. For systems 9 and 10 if a non-mechanical cooling fan is required by section G3.1.2.8.2 then the fan power is 0.054 watts/cfm. 3. This sounds like unconditioned space. So no system 9 or 10 should be modeled.The ventilation system would be modeled identically.

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