One thing to remember is that the assembly and not the materials determine an effective U-value. R-19 batt insulation between metal studs may be half the R-value,
and that is what you should be using for the energy model. If you select a wall system in design builder that includes thermal bridging elements, it should push the effective insulation value to the energy model.
Ned Lyon, P.E. (MA, WV)
Staff Consultant
SIMPSON GUMPERTZ & HEGER
781.907.9000 main
781.907.9350 direct
617.285.2162 mobile
781.907.9009 fax
www.sgh.com
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
Sent: Thursday, February 25, 2016 8:24 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Materials U-Value Calculations in E+
Hi everyone,
I need some help to understand how is the calculation of u-value material in energy plus.
Someone has a spreadsheet that calculates according to the material specifications?
I ask this because I use the design builder to enter the building elements, and saw that the U-value is not the same in EnergyPlus report.
I don't know how energyplus calculate this.
Thanks for all.
Best regards,
Ivan Mezzacapa
Cushman & Wakefield
Energy Efficiency and HVAC Coordinator
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Posted by: "Edward G. Lyon" <EGLyon@xxxxxxx>
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