Now that I have the PC and fittings, I’ve conducted a dry run. See this thread
http://forum.northernbrewer.com/viewtopic.php?f=1&t=110892
for background.
Ambient air temp: 82-88* F (was 106 yesterday!)
Ground water temp: ~78* F
Water Inlet flow rate (from garden hose): ~6.73 gal. per minute (GPM)
Here is a photo showing the configuration I used for the dry run.
http://s564.photobucket.com/albums/ss81/kcbeersnob/?action=view¤t=IMAG0119.jpg
On all tests, the kettle ball valve and the garden hose valve were wide open.
Summary of results:
Test 1: Cooled 5 gallons to 82* F in 4 minutes (1.25 GPM). Used ~27 gal. of cooling water.
Test 2: Cooled 5.5 gallons to 82* F in ? minutes. Forgot to start the timer.
Test 3: Cooled 6 gallons to 82* F in 5.03 minutes (1.19 GPM). Used ~34 gal. of water.
On tests 1 and 2 the siphon from the kettle stopped early, leaving 1.75 gal. and 1 gal. respectively in the kettle. On test 3 I improved my siphon by not messing with the wort outlet hose while it was running.
On tests 2 and 3 I put the PC in a styrofoam cooler as shown in the image below. I placed ice on all exposed surfaces of the PC (back, top and front). It didn’t make a damn bit of difference.
http://s564.photobucket.com/albums/ss81/kcbeersnob/?action=view¤t=IMG_1530.jpg