Blalh -- blah
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Basic idea is to estimate monthly gain from collector and compare to monthly heat loss from house.
Gain from collectors:
Could use the efficiency curve for
For each month:
Calc average solar radiation on your collector for the months of interest:
This could be PV watts -- this would allow orienting collector to any angle
Use Home Heat Loss program to estimate UA for the home
Could do this with monthly HDD from one of the places
Or, could have them input avg high and average low for each month from WeatherSpark