Upside down counterflow chiller.

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Had my Grainfather for over 2 years now and brewed batch 42 today. Am I the only one to have the counterflow chiller upside down all this time? Not sure it makes a huge difference but I stumbled across this video (2:50) which clearly states it's one way and not the other. Oh well, let's hope this beer is even better than those that went before it.
 
I am pretty sure it makes absolutely no difference. Three instructions say that you should have the hot part at the top as hot liquid will naturally rise due to convection. But convection is tiny compared with the flow rate of the wort and the cooling water, so I'm sure it makes no difference.
 
I can't see it would make much difference either tbh. What I have noticed, however, is that having it the 'right way around' gives much less room for manoeuvre when it comes to where you put the chiller and the pipework.
 
I am pretty sure it makes absolutely no difference.
Brewing this morning, I've just had a revelation, and I retract this comment.

From the worts point of view, it doesn't make a difference. But from the cooling water, it does. Tap water (and probably from a water butt too if that is your preference) contains dissolved gases. The wort won't due to the boil. As you tap water gets heated in the CFC, the gas will come out of solution. If you have the cold water inlet at the top, the gas in the cooling lines will try to bubble up to the top. It'll fight against the flow of water, but from my experience this morning, unless you have the tap water on full-bore, the gas won't get pushed out of your cooling lines. Gas pockets in the cooling water will make it less effective as a cooler.

But if you have the cold water inlet at the bottom, both the water flow and gravity will make the air bubbles come up to the top and be pushed out of the hot water outlet. This means there are no air pockets in your CFC and it cools more effectively
 
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