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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

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Our process load is higher than 25%. Do we have to justify that?

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Our local code references ASHRAE 90.1-2010. Should I use that for my documentation, or 90.1-2007?

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Forum discussion

CS-2009 EAp2:Minimum Energy Performance

Proposed Building Envelope Assembly Thermal Properties

TOMAS URIBE

PROJECT MANAGER

SOLUCIONES ENERGETICAS SOSTENIBLES

LEEDuser Basic Member

7 thumbs up

May 31, 2012

How do I calculate the U-factor for the construction assembly (e.g walls) according to ASHRAE 90.1-2007 Appendix A if one or some of the construction layers properties are not specified in the mentioned appendix? I'm trying to calculate the assembly U-factor of a wall which have the following construction layers: Plaster, Common brick, Airspace, Low weight concrete block, Plaster, Airspace and finally Marble. I found that common brick and marble thermal properties are not specified in appendix A so, which path should I follow? Can I take the values showed in any other reference? Thanks in advance

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Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Thu, 05/31/2012 - 18:50

Appendix A includes an assumed wall construction including indoor and outdoor surfaces. If your wall deviates thermally (not just different materials) and the material in question is continuous then simply add the material to the Appendix A value. I would recommend the use of the values from the ASHRAE Handbook.

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