[Skulemate]

I completed one short test, lasting 30 minutes. My setup included my insulated resevior positioned approximately 3' above the centreline of the pump, with 5' of 5/8" vacuum PVC tube as an intake and 5' of 1/2"x5/8" PVC as the discharge. I had my temp probe sumberged in the resevior, and when running there was considerable mixing of the fluid in the resevior (at this head my pump moves approximately 580 GPH). I used 5L +/- 5% of tap water in the resevior, and siphoned from the resevior to prime the pump and tubes. After setup I waited five minutes to check that all was well, and to allow the pump to reach its operating temperature, before taking the first measurements. Here are the results from my short initial test. I do plan on repeating the test for a longer period of time to check whether or not these results are repeatable. Please bear with the ugliness of the table:

Time.........H2O °C...Ambient °C
21:18........23.2........22.3
21:22........23.8........22.1
21:27........24.3........22.0
21:35........25.1........21.8
21:42........25.8........21.7
21:58........27.2........22.2

I then plotted the results in excel, and added a trendline, which had R=0.9987 (omitting the first point since it was not exactly linear... guess I should have waited another minute or so before beginning the test). As you can see, there was a temperature increase of 4.0°C in 30 minutes. This temperature rise corresponds with a 83700J increase in energy, which is approximately 46.5W (at least, that's how I remember it being done... please correct me if I am off base). Since my pump is rated at 190W, that's 25% of the pumps rating going to the water.

Comments or questions?