Ok guys and gals... I've been trying to design an immersion chiller that will cut my cooldown rate by a factor of 3. Right now, I immerse the pot in another larger pot and fill that outer area with cold water and allow it to flow. Here's where I'm at. Right now, I estimate I've improved about 63%. I'd like any suggestions:
Pot: dp" hp"
Tubing: dt=3/8"
The coil will be half the diameter of the pot, and the there will be one coil of space inbetween each coil-wrap.
There will also be a riser tube coming up the center of the pot and out the side.
lcoil= pi*dp/2 Ncoils=hp/(2*dt) L= lcoil*Ncoils
L=pi*dp*hp/(4*dt) Acoil=pi*dt*L = pi^2 *dp*hp/4 Ariser=pi*dt*hp
Apot=pi*dp*hp (surface area of pot)
With my pot, that gives:
Acoil= 296 in^2 Ariser.1 in^2 Apot I0 in^2
Two relatively interesting things come out of this analysis. 1) The diameter of the tubing does not appear to provide much of an advantage, except that a smaller diameter tube will displace less of your wort when you dip it in the pot. 2) The outer edges of the pot have a great amount of heat transfer surface, which is hard to match with one set of coils.
Things my analysis ignores:
1) The better flow of water through the coils than what I now have in my current setup. 2) Dipping the coils will increase the height of the pot that the water sees, thuse giving more heat transfer surface.Things my design ignores:
1) Natural circulation to improve mixing. 2) Paralell flows/higher flow rate = cooler water (multiple coils)