Temperature the last couple of days at the new solar collector for our hot water system:
Low & high air temps in F were:
31 41 12/8 (partly cloudy)
32 50 12/9 (rainy)
32 43 12/10 (windy)
23 31 12/11 (windy)
Temperature in the new holding tank that feeds our old hot water heater:
We think the drops in this chart (e.g., 12/9 morning, and evening of 12/10 and 12/11 and 12/8) correspond to showers being taken or warm/hot-water laundry being done.
The most heat is collected between 11:00 and 1:00. Heat was collected yesterday even though it never got above freezing outside. No heat was collected on the rainy day.
I think the next graph is the temperature at the heat exchanger (between the glycol feeding the solar collector and the water in the holding tank).
Energy-revolution-is-happening article with cool Google Earth wind farm video