Carnak, after a 2 days of trying, I'm sorry to say I'm struggling to follow your instructions.
Are you able to dumb it down to the point where I can identify specific columns in the ASHRAE table, and perform a formula to generate the ACCA Grains data? Using Birmingham AL as a control, I need to be able to generate somewhere close to: 34Grains@55%RH / 41Grains@50%RH / 47Grains@45%RH.
Something like: Cooling Dry Bulb @ 1% minus Mean Coincident Wet-Bulb = etc
Does the ASHREA table contain enough data to generate these numbers?
Garbage In Garbage Out, right.
I've noticed there are disparities between ACCA and ASHRAE data when calculating design grains difference between inside / outside grains.
Birmingham AL - ACCA
45% - 47
50% - 41
55% - 34
Indoor assumes 75F dry bulb on both. ACCA seems to round up 2 grains?
If only the outside Dry Bulb and Coincident Wet Bulb figure could easily be calculated without the need of an online tool. Otherwise I could enter the formula in the Excel sheet and let it generate the numbers.