This page provides solar radiation values for Thermomax Solar Collectors and expected gallons of water raised by 60 degrees F. The average daily Radiation figures are from the Solar Radiation Data Manual, WBAN NO. 94846.Thermomax collector (average) efficiency of 70% (based on Florida Solar Energy Center, Solar Collector Test Report No. 97005) is used for this chart.
Latitude: 41.78 N Degrees Longitude: 87.75 W Degrees Elevation: 190 Meters System Tilt: 40 Degrees Annual Total BTU's per square meter (10 tubes): 3,649,405
Chicago, IL 
RADIATION
