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Home Brew Forums > Home Brewing Beer > Beginners Beer Brewing Forum > How fast to run water in wort chiller?
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Old 09-19-2011, 12:26 AM   #1
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Default How fast to run water in wort chiller?

Howdy,

I have a stainless chiller. Should I: a.) run the water fast to keep the water in the chiller colder or b.) run slower to increase heat transfer time and save water?

Thanks

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Old 09-19-2011, 12:55 AM   #2
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Originally Posted by Strangelove
Howdy,

I have a stainless chiller. Should I: a.) run the water fast to keep the water in the chiller colder or b.) run slower to increase heat transfer time and save water?

Thanks
I'd run the water fast, assuming I can dispose of the extra water easily or reuse it. You'd use less water with a copper chiller.
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Old 09-19-2011, 01:00 AM   #3
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Okay...I'll spend 2 months worth of water bill money to switch to a copper one. Thanks.

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Old 09-19-2011, 01:04 AM   #4
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nice and slow, you're just gonna waste water if you run it fast. where on earth did you get a stainless chiller???

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Old 09-19-2011, 01:08 AM   #5
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Faster would increase the heat transfer rate. Rate of heat transfer = Massflow rate*specific heat capacity*difference in temp. Increasing mass flow fate would therefore increase rate of heat transfer. It will decrease your differential temp but the offset would be made up with total rate of heat transfer. Either way try a few batches and I bet you don't see more than a few minutes difference between start time and end time no matter how you do it. The major factor is the UA of the heat exchanger which you can not change.

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Old 09-19-2011, 01:09 AM   #6
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Isn't the heat transfer coefficient of copper something like 10x-30x higher than that of stainless steel? I just remember the demo in my physics class back in college where the SS rod in a flame was still cool to the touch at the other end, about 12 inches away.

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Old 09-19-2011, 01:14 AM   #7
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Isn't the heat transfer coefficient of copper something like 10x-30x higher than that of stainless steel? I just remember the demo in my physics class back in college where the SS rod in a flame was still cool to the touch at the other end, about 12 inches away.
Doesn't matter what c is it is a constant as it is not changing in the equation. But yes copper has a much higher heat transfer coefficient than stainless.
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Old 09-19-2011, 01:23 AM   #8
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If you want to save time (quickest cooling), run the water as fast as you can.
If you want to save water, run it slow.

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Old 09-19-2011, 01:39 AM   #9
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If you want to save time (quickest cooling), run the water as fast as you can.
If you want to save water, run it slow.
Hit the nail on the head with that one. Strangelove your question kind of answered itself, it is your choice whether you want to save time or water
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Old 09-19-2011, 02:16 AM   #10
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Sounds as though a few responders know the finer details of heat transfer. Can anyone comment on the effects of slowing the flow rate by dampening down the outflow side? I had some experience years ago with an electric instant hot water heater that continued to blow heating elements. I braised in a shutoff valve on the outflow side to build pressure around the element and never blew another element. I put a shutoff on my homemade chiller ad choke down the flow. I find the discharge water to be hotter and the cooling time shorter than just running water at full flow. Any one have any experience or knowledge about this??

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