Good old Joe slappin' people around

[Gray Wolf]

This is what I plan on getting instead of the mt-69

http://www.amazon.com/Stainless-Steel-Jockey-Draft-Coil/dp/B00420V094

I would be able to set them side by side in the same ice chest with denature alchy/dry ice and have no need for a big trash can to hold my r/c tank. Which gets annoying having to empty everyday

It might even be a good idea, because of the high psi in the recovery tank from not being chilled added to the slow flow for cryo butane. Might help the overall flow?

I don't know, perhaps I need a second opinion

Good score on the 50' coils! I grabbed a couple myself at that price.

Heat transfer is a function of delta Temp, K value of the heat exchanger, heat exchanger area, and flow, which translates into residence time for the heat to transfer.

Clearly a greater temperature difference across the exchanger, its area, and the flow are the ones which we have the most control over.

We can run anything from ice water to alcohol and dry ice or liquid nitrogen in the exchangers, and we can slow down the flow to increase residence time, or add more coils.

Higher pressure on the storage tank, also means slower recovery. The butane coming out of the pumps is hot, regardless of whose recovery pump you run, so it behooves us to cool that down before putting it back in the tank, if we are trying to optimize efficiency.

A tank of chilled butane is also a heat sink, adding to efficiency if it is significantly below its boiling point, so you might consider chilling the tank, the returning butane, and the outgoing stream.

If you chill the outgoing stream, the tank temperature could be run colder, even if it isn't at ambient.

 

[Gray Wolf]

He can't really say the psi of the SS since it isn't a big issue for sending beer through..

He obviously wouldn't suggest it be used for anything else I'm sure so I didn't ask further.

I may just take an offer from a friend and grab an mt-69 from him in the meantime of upgrading to 3/8".. Let me know how your experiments go icdog.

I'm still going to use my promax until I can afford the cps tr-21.. My head has been spinning in circles. Haha

I use Hoke or Swageloc compression fittings.

The tubing burst is in thousands pounds per square inch, and the fittings are rated at over 2000 psi, so I wouldn't worry about that part of the assembly.

Consider a design that self drains the tubes, so that when you tear down, you don't have so much liquid butane in the lines. I accomplished that by placing the exchanger over the top of the storage tank, and ran the bottom end of the vertical coil through a fitting in the bottom of the tank.

 

[Chonkski]

Thank you so much for all the help in explanation!

You put everything into perfect perspective for me, I will make the orders on the coils I posted and bend them to perfect shape, self draining and all.

I didn't consider recovery time or tank psi, started dreaming there thinking I could get away with not chilling the tank itself.

I am excited to see the coil within a coil!

 

[flatslabs]

I don't know if they make something similar to this in SS, but we use a "convoluted copper coil" for some of our brewing applications for heat exchange.

http://morebeer.com/products/convoluted-copper-25-58-fittings.html?gclid=CPuX8IOJw8ACFSpp7AodoTEA9Q