Solar Heat-gain

Q: I finished TMY (Typical Meteorological Year) conversion and normalization routines to compile the 239 reporting station's data into summary records for each station, the idea here is to select a location based on the closest station to use that station's summarized data elements to drive calculations within for spread-sheet. I also finished the porting of NREL's solar.c/h to VB for use in the spread-sheet which along with TMY station data summaries should provide (among other things) solar heat gain on any opaque or through and glass construction surface. So my next step is to focus on the application of all this in the spread-sheet. The general calculation I have been currently using for total heating & cooling loads is: 1? Heat-Loss Per-Day = ((Area / Thermal Resistance) * 24)) * HDD or CDD (supplied by TMY). So, if anyone can offer any constructive ideas, I would appreciate it.

A: I think so, for heat-loss anyway, my current spread-sheet functions using the general formula: Heat Loss Rate = Area x (Temp inside - Temp outside) / Thermal Resistance of structure Based on calculations from here: http://hyperphysics.phy-astr.gsu.edu/Hbase/thermo/heatloss.html Which goes on to modify the general formula to calculate 1? Heat-Loss Per-Day, and from there incorporate heating and cooling Degree Days for total heat-loss for whatever time period. I think I'm ok up to here, but now I'm looking to modify the general formula to include solar heat-gain, I image that TMY has whatever data is needed, just looking ideas for in modifying the general formula.

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