The true definition would be per surface and is as described in e+ documentation. However, ASHRAE 90.1 dictates the factor should be read of a table (regardless of perimeter) and is thereby assuming a 150mm slab with xmm insulation...I.e. becomes a factor of insulation only. So you work backwards: get the required F-factor from table 5.x, lookup the corresponding F-Factor in Appendix A to find the required insulation R-value for your 150mm slab. Create a 150mm construction with a insulation as found, and wolla, you have the baseline required slab.
For more info check appx A.
Jean Marais
Sent from my iPhone
Sent from my iPhone
Dear EPSG -I have a quick question about the "Construction:FfactorGroundFloor" object in EnergyPlus. The third and fourth input field asks for the area of the slab on grade floor and the amount of exposed perimeter.My question is this: do I input these values for the surface (assuming the floor is divided into multiple surfaces due to thermal zoning), or for the entire floor? The inputoutreference specifically says "of the slab-on-grade or underground floor."The only example file that has this object is a one continuous zone model, so it does not provide any direction on the issue.Cheers and thanks!Jacob Dunn - LEED AP
Architectural Simulation Specialist
University of Idaho Integrated Design Lab
p_208.401.0652
a_306 S 6th Street, Boise ID 83702
"Building services today are essentially mechanical compensations for the fact that buildings are bad for what they are designed for--human life" - Bjarke Ingels
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