This entry was posted on Tuesday, January 26th, 2010 at 4:38 pm and is filed under Home Energy, Home Solar Power, Renewable Energy, Solar assisted water heating. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.
Test Results
August 6, 2006I attached a HOBO data logger to the system so I could monitor the performance of the system. I made up my own sensor probes to monitor the temperature coming into the Wand and out, the temperature at the top of the tank, and the PV voltage (to track the solar exposure). The HOBOware software allows me to produce a very clear graph of my first full day. The outdoor temperatures peaked in the mid ’70’s and there were no clouds. We used hot water in a normal way, and the graph clearly shows a significant solar contribution (green line). I will add more graphs as I tweak the system.
Aside from all these detailed statistics, we are noticing a distinct change in the pattern of the water heater’s operating time. Our heater uses a forced air vent driven by a loud blower and typically we used to hear it kick on very soon after using hot water. In the last day or so we have barely noticed it running at all! This is a blessing for my wife who uses the daylight basement for her business as it is much quieter now.
One thing I learned was that the sensor that reads tank temperature for the Differential Temperature Controller should not be at the bottom of the tank. That is where it was in the morning on the day of this graph. The other sensor is right at the top of the collectors. The pump turned on before there was enough sun to run the pump, since the PV was not getting direct sun at that point. The bottom of the tank has 60F water coming from our well that keeps the sensor too cool, and when the collectors got above 60F or so the DTC turned on the pump before the water was hotter than the average tank temperature. When I moved the sensor to near the top of the tank later in the day, the pump turned off at a more appropriate time.
Average tank temperature 87.329F
So far so good, things are progressing.
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