[Bldg-sim] change both U-EFF & UF/UWMat?

[Eric Shadd]

There was an article in BUILDING ENERGY SIMULATION, Vol 19,  No 1, Spring 1998, called "Underground Surfaces How to Get a Better Underground Surface Heat Transfer Calculation in DOE-2.1E".  It outlined the process for converting F- and C-factors into DOE2 inputs.  That article's process required changing both the U-EFFECTIVE and a Ficticious R Material (Typically called UF/UWMat in eQUEST).
 
Does anyone know why they required changing both the U-EFFECTIVE and the Ficticious R (UF/UWMat)?  We've run some parametrics and found the energy use difference between changing only U-EFFECTIVE versus changing both the U-EFFECTIVE and Ficticious R to be small.
 
-Eric
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