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-   -   Size and length of immersion chiller and HERMS coil (http://www.homebrewtalk.com/f11/size-length-immersion-chiller-herms-coil-311234/)

calpyro 03-08-2012 05:04 AM

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Originally Posted by DeafSmith View Post
I don't know about the HERMS coil because I don't have a HERMS, but for the chiller, the higher your flow, the faster it will chill, so 1/2 is better than 3/8. Even if you only go with 3/8, 50 feet will be long enough - in fact, you would probably be better with two 25 foot sections in parallel than with a single 50 foot section - you will have less resistance and thus a higher flow rate. If you have a 100 foot, 3/8 chiller, the resistance in the line will really cut down your flow - if you have to have 100 feet, make it two 50 foot sections in parallel.

Just as important as flow rate for quick chilling is to keep the wort moving past the coils - either by manual or mechanical stirring, or by using a pump to recirculate wort and inject it at the top of the kettle to keep a whirlpool going.
Good point. I have a 70' combination HERMS/Immersion coil that ran too slow. I split it in to two-parallel coils and it rocks. I think that a 1/2" would be nice. Be careful to not have it too long. When the coil is really long, they often have all of the coils stacked upon each other and create a kind of "cylinder which no wort to water can pass through. having the liquid pass freely past the coils adds to the effectiveness.
Below is a photo of my HERMS/Immersion coil with a stirring paddle.

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