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Re: [EnergyPlus_Support] C-Factor for Underground Walls and F-Factor for Slab-on-Ground Floors (ASHRAE 90.1, Title 24 etc)
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- Subject: Re: [EnergyPlus_Support] C-Factor for Underground Walls and F-Factor for Slab-on-Ground Floors (ASHRAE 90.1, Title 24 etc)
- From: <seanking.1970@xxxxxxxxxxx>
- Date: 14 Feb 2014 08:25:24 -0800
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- Delivery-date: Fri, 14 Feb 2014 09:25:31 -0700
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Hi Jean,
Thanks again for your help.
While checking your spreadsheets, the sheet "Slab-on-grade" (the last one) especially, I have two questions.
(1) The table at the top of your sheet shows insulated value (R-value) against F-factor for a fully insulated unheated slab-on-grade floor (in order to work out how much insulation needed for F-factor 1.264), which must be extracted from ASHRAE 90.1-2007 Table A6.3 (SI units version page 97). I think you might not need to do regression (through trendline and get an equation) to calculate insulation level for F-factor = 1.264, as I found at the top of Table A6.3, F-factor of 1.264 (rounded to 1.26 in the Standard) requires no insulation (R-0.0).
(2) With EnergyPlus two objects CFactorUndergroundWall and FfactorGroundFloor available (they only require C-factor and F-factor values and some geometrical data), should we still need to define layered constructions for these two (we need to work out insulation thickness for a given/defined insulation material)? If yes, we might have nowhere to input these data via EnergyPlus idf editor.
Please do excuse me if I have more questions to ask after re-reading your reply and spreadsheets.
Best regards,
Sean
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