Heat Exchanger from Large Coil of PEX
Ken used a large coil of PEX to make a very nice water to water heat exchanger -- details below... Ken is using this in a hot tub heating application, but it might work well in other heat exchanger application.
So what I did was to take your ideas and fit it too very specific requirements that I have. My "Heat exchanger" can not exceed 4' x 4' x 6' outside dimensions. As I will be heating a Hot tub as well, I wanted to jam as much into the exchanger as I could, with out wasting space while providing the best possible efficiency.
I created a frame in which to coil the 1" PEX tubing and to maintain a 1" spacing between all loops. This did take a few hours and a bunch of fore-head banging before I go it right. I thought I'd share it with you in the event some one else could find it helpful. Please feel free to view the attached pictures, and post them to your site if you'd like.
I used 1" PVC between the coils both vertical and horizontal, and tied it altogether with polypropylene string (I could have used CPVC, but I don't think it matters as there will not be any use other than for spacing and regular PVC is rated to 200 F).
The dimensions of the coil are 32 1/2" by 32 1/2" for 300' of PEX. Basically 3 coils one inside the other starting at the bottom going up, down, then back up again.
I plan to use the vertical tubes to push the hot water to the bottom of the tank on one side and suck the "cool water off the bottom on the other side by inserting a flexible tube down to the bottom of the vertical PVC. I may have over done it on PVC elbows that I am using to maintain a 1" space under the bottom of the coils.
Controller & Pump: I found the Gold-line controller and a Laing D5 Strong pump on "East Coast Solar". http://www.eastcoastsolarsystems.com The pump needed to fit these specs: 14 feet head, 5-7 GPM, 160 F, DC 12-24 Volts, and be less than $200. I found it for $185 with shipping.
Though my system is not up n running yet, it should be with in the next couple of months. This whole thing is taking longer as I am also rebuilding a Hot tub from the ground up and will be incorporating the exchanger tank next to the tub under the surrounding decking. I plan to build another system later to use for whole house heating via central air. My biggest challenge will be a water to air exchanger, but I'll tackle that later on down the road. I hope this is helpful for you or anyone else.
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