I'm playing with a spread-sheet that already has standard (I think?)
heat loss calculations for a "Box" structure:
1° Heat-Loss (BTU/Day) = ((Rvalue / Area) * 24) * HDD (or CDD)
I think I'm ok up to this point, but I want to add Heat Gain
calculations for solar, electrical, and human and I'm in the mud with
solar heat gain. I already have the structure components broken into
N,S,E,&W sides for solar heat gain and have a TMY2 (Typical
Meteorological Year) database of daily records from 239 reporting
station scatter around the country which seems to have data buckets
containing all the information I need?
Year, Month of year, Day of month, Hour of day, Extraterrestrial
Extraterrestrial Direct Normal Radiation, Global Horizontal Radiation,
Direct Normal Radiation, Diffuse Horizontal Radiation, Dry Bulb
Temperature, along with others.
I think Degree Days would be IF(average daily Dry Bulb Temperature >
Tin, average daily Dry Bulb Temperature - Tin,0)
So, my questions are:
1) Is there a "Standard" formula to calculate Solar Heat Gain for
N,S,E, &W sides?
2) What TMY data bucket(s) should I focus on to feed it?