Flexible aluminum conduit vs copper line for thermal conductivity?

[Texastrooper]

I am still debating about my kegerator design and if I should use towers or not. With shanks on the collar sticking out to the side the kegerator may become to wide to push through my doors. With towers I won't have this problem but then I need to cool them. I am not a fan of a fan running all the time and would rather use metal lines for thermal conductivity as some people have done here.
I love the simplistic PVC tower/arch design with an arch like this.
https://www.homebrewtalk.com/f51/4-faucet-pvc-draft-tower-102986/
or this:
http://www.wortomatic.com/images/2008/285.jpg

But with rigid copper lines it will be almost impossible to get around the corners inside a tower.
Has anyone used flexible aluminum conduit instead?
http://www.homedepot.com/p/AFC-Cabl...lexible-Aluminum-Conduit-5602-30-00/100010697

I know the thermal conductivity of aluminum is only half as good compared to copper but I wonder if it would still work?

Since I want six taps but I could always install two straight towers. But that would be too simple... lol

 

[JuanMoore]

I would think even with copper that you'd have relatively poor performance using a passive system. Any tower larger than a simple vertical design is going to much more troublesome to keep cool. I made a 4 faucet pass through tower using 3" copper tubing, and have tried several methods for cooling. Short of recirculating coolant with a pump, a fan blowing all the time is the only moderately effective method. Even that doesn't keep the tower quite as cool as I'd like, but cool enough to prevent too much foam on the first pours.

FWIW if I had it to do all over again, I'd build a coffin box rather than a pass through tower. The faucets/shanks are a PITA to install/service, it's more difficult to get sufficient air flow to keep cool, and a coffin box would have been easier to build, insulate, and install.

 

[Texastrooper]

Thanks for the ideas. Maybe a coffin box is the way to go with a large opening into the freezer so that the taps get sufficient cool air and which provides easy access to the taps for cleaning.