I have tried feeding the cooling water into both connections without noticing much difference, the only difference I have noticed is that when I feed the water to the connection closest to the still I get a more continuous flow with a nice spiral from the product. When I feed the leibig from the furthest connection from the still the product flow is not so clean.
Which is the correct method of feeding the cooling water and why?
Leibig cooling question
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Leibig cooling question
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Re: Leibig cooling question
Feed from bottom to top.(Flow going counter to vapor)
This has a couple of advantages. You are less likely to get air trapped in the cooling path. And those that have done tests on it agree that it is more efficiant.
This has a couple of advantages. You are less likely to get air trapped in the cooling path. And those that have done tests on it agree that it is more efficiant.
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Valved Reflux, 3"x54" Bok 'mini', 2 liebig based pots and the 'Blockhead' 60K btu propane heat
Valved Reflux, 3"x54" Bok 'mini', 2 liebig based pots and the 'Blockhead' 60K btu propane heat
Re: Leibig cooling question
Coolant should flow in the opposite direction to the vapour ('counterflow').
Counterflow gives a higher average temperature differential between the coolant and the vapour, and hence a more efficient use of coolant.
Counterflow gives a higher average temperature differential between the coolant and the vapour, and hence a more efficient use of coolant.
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Re: Leibig cooling question
opposite directions:
-last thing distillate sees is the coldest water, distillate comes out cold as possible
-water shell fills from the bottom up therefore is always 100% full no matter how fast the coolant goes.
same direction:
-last thing distillate sees is the water after its already done its work, at the hottest point. distillate is hotter, requires more coolant flow.
-coolant merely trickles down through large empty water shell rather then filling the space, vastly less contact.
-last thing distillate sees is the coldest water, distillate comes out cold as possible
-water shell fills from the bottom up therefore is always 100% full no matter how fast the coolant goes.
same direction:
-last thing distillate sees is the water after its already done its work, at the hottest point. distillate is hotter, requires more coolant flow.
-coolant merely trickles down through large empty water shell rather then filling the space, vastly less contact.