Re: [EnergyPlus_Support] Re: U-factor floor in contact with ground

[Jason Kirkpatrick <jason.alan.kirkpatrick@xxxxxxxxx>]

Again you should read page 131 of the engineering reference, which gives the following in terms of R value

F-Factor  x   Exposed Perimeter Wall Length  / Zone Floor Area  =  Effective U Value

rearranged gives

F-Factor =  U-Value x Zone Floor Area / Exposed Perimeter Wall Length

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