See all forum discussions about Schools-2009 EAp2

Subscribe to new posts about Schools-2009 EAp2 Post a new question aboutSchools-2009 EAp2

See LEEDuser’s guidance on Schools-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

Schools-2009 EAp2:Minimum Energy Performance

The baseline U-values

Ameet AA

LEEDuser Basic Member

27 thumbs up

April 13, 2012

The baseline U-values proposed by ASHRAE 90.1-2007 for a building with high thermal mass in climate zone 1 (see below extracted from table 5.5-1) seem to be too low-performing. Are these correct? If so, why are they that low-performing? Is it to do with insulation not being usually specified in hot dry zones? - Roof (Insulation entirely above deck) = 0.063BTU/hr Ft2F = 0.3577W/m2K - Walls, Above-Grade (Mass) = 0.580BTU/hr Ft2F = 3.2934W/m2K - Floors (Mass) = 0.322BTU/hrFt2F = 1.8284W/m2K - Fenestration (All) = 1.200BTU/hrFt2F = 6.8139 W/m2K

Post a reply

Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Fri, 04/13/2012 - 13:28

Those are the baseline prescriptive values. Do not use the mass values for your appendix G model (see Table G3.1#5(Baseline)(c). In the US this climate zone requires little to no heating, a lot of cooling and tends to have frequent high humidity. Definitely not dry. The ASHRAE 90.1 committee would need to answer why they are what they are. Uninsulated mass buildings with single pane windows are pretty standard practice in those areas of the US.

Ameet AA

LEEDuser Basic Member

27 thumbs up

Fri, 04/27/2012 - 11:33

Thank you Marcus! Project location is in middle east and no heating require.so if we considered these values as the basline then the compared saving with proposed building would be massive.

Add new comment

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