Re: [EnergyPlus_Support] C-Factor for Underground Walls and F-Factor for Slab-on-Ground Floors (ASHRAE 90.1, Title 24 etc)

[<seanking.1970@xxxxxxxxxxx>]

Thank you very much, Jean. Very detailed and useful reply.
However, I still cannot come out of this maze, I need a straightforward confirmation to my statements below.
(A) In EnergyPlus, we can definitely use F-factor, C-factor objects and do not need to care about layered construction at all (E+ does, as you said: f-factor c-factor objects create layered constructions internally, which has also been confirmed by EneryPlus support staff).
(B) As an alternative way, we can also use layered constructions for F-factor (as an example) with the procedures as (1) read F-factor value from Tables 5.5-1 through 5.5-8 depending on climate zone and space conditioning category; (2) calculate equivalent U-factor based on the ground floor area and exposed perimeter; (3) create layered construction (normally a concrete plus an insulation) to meet U-factor calculated by step 2; (4) set outside boundary condition to ground (not FCfactorMethod then). For this setting, we just forget about F-factor (just used as an input to calculate U-factor), but use conventional U-factor instead.
Best regards,
Sean



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