I have a question concerning doe2/eQUEST DESIGN-DAYs.
One of the keywords for DESIGN-DAY confuses me: CLIMATE. I have not been able to find this documented in the current doe2 reference manual or 2.1A engineering manuals.
It appears the CLIMATE keyword can accept one of three inputs: "SUBARCTIC," "MIDLATITUDE," or "TROPICAL." The default is MIDLATITUDE and does not appear to reference anything else.
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So I have a few questions:
1. What is this input used for? Does it help to determine solar angles during design day calculations? Does it affect how other DESIGN-DAY inputs are interpreted?
2. Since one of the options is named "MIDLATITUDE," my best guess is this is trying to establish in a loose sense which slice of the globe the weather station is located at for solar angle purposes. From that guess, I googled the topic for a bit
a. SUBARCTIC latitudes are > 66.5 or < -66.5 (Inside the Arctic circles - experiences days of complete daylight/darkness)
b. TROPICAL is between -23.5 and 23.5 (Tropic of Capricorn/Cancer - experiences the sun traversing directly overhead)
c. MIDLATITUDE = everywhere else
3. I struggle however with the concept of a DESIGN-DAY input based on latitude, where
a. The latitude is already a part of the weather file required for every simulation... and pulling the exact latitude would be more accurate anyway (I confess here I have never studied solar pathing in great depth - the problem may be simpler than I realize?).
b. These bands alone don't give you enough information to know when you're in the lower hemisphere (where solar angles based on the day/month would be flipped)
c. This leads me to question whether there's a (meaningful) difference in solar angles experienced for loads calculations when you use the weather file instead of DESIGN-DAY inputs.
d. Alternatively, maybe the latitude IS pulled from the weather file for solar angle purposes so I'm completely on the wrong path as to the purpose/intent for the CLIMATE input.
Can anyone set me straight on this topic?
~Nick
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Nick Caton, P.E., BEMP
Senior Energy Engineer
Energy and Sustainability Services
Schneider Electric
D 913.564.6361
M 785.410.3317
E nicholas.caton at schneider-electric.com
F 913.564.6380
15200 Santa Fe Trail Drive
Suite 204
Lenexa, KS 66219
United States
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