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Thermal Bridging Calculation for Wall U factor of ASHRAE 90.1 OfficeSmall Prototype

Hi,

I calculated the unmitigated and mitigated exterior wall U-factors for the ASHRAE 2019 and 2022 Small Office prototypes due to thermal bridging. As shown below, my calculated U-factors differ from those in the PNNL Small Office prototype. Does anyonmeknow if there are any issues with my calculations? BTW, I used 0.051 as clear-field thermal transmittance of the wall assembly.

image description

Thanks,

Eric Wang

Thermal Bridging Calculation for Wall U factor of ASHRAE 90.1 OfficeSmall Prototype

Hi,

image description

Thanks,

Eric Wang