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Home Brew Forums > Home Brewing Beer > DIY Projects > Brew Stands > HERM Heat exchanger ideas
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Old 08-05-2009, 04:48 AM   #1
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Default HERM Heat exchanger ideas

I think i want to incorporate an external heat exchanger in my HERMS build. I am curious what others have built. I think this one looks promising but hasn't been updated recently. Anyone have any pictures or build details. FYI, I'm planning on using electric for boil, sparge and mash; and have 3 kegs ready for modification. Thanks

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Old 08-05-2009, 05:03 AM   #2
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I think i want to incorporate an external heat exchanger in my HERMS build. I am curious what others have built.
The heat exchanger in the picture is nice looking but requires good metal fabrication skills and/or a chunk of cash to pay a fabricator.



Have you considered an external RIMS heat exchanger? They're easily built, provide very dynamic heat capacity, and have a smaller footprint than an external HERMS tank.

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Old 08-05-2009, 05:08 AM   #3
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i like the more gentle heating of a HERMS HEX. Although, a recent post about an electric instant water heater build may have debunked the scorched mash/wort theory. I was thinking the external heat exchanger similar to one in link but all copper. That way i could solder the joints.

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Old 08-05-2009, 05:45 AM   #4
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Why not just soft solder stainless then?

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Old 08-05-2009, 01:31 PM   #5
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Why not just soft solder stainless then?
i guess i'm not familiar with the process
time for a search
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Old 08-05-2009, 01:52 PM   #6
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or silver solder

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Old 08-05-2009, 03:04 PM   #7
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any one have any design ideas or pictures beside the one I posted?

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Old 08-05-2009, 03:27 PM   #8
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I think a ultra-low density element directly in the wort path is pretty gentle and you're not going to overheat if your probe is in the output path near the HEX. I'd like to know why an external HERMS unit is preferable to an HLT based HERMS given the additional element, controller and footprint required.

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Old 08-05-2009, 03:30 PM   #9
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After reading some online articles, I just felt it was easier to heat a small volume of water as opposed to all the water in my HLT. This is entirely in the planning stages so I'm open for suggestions.

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Old 08-05-2009, 04:12 PM   #10
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Quote:
Originally Posted by pickles View Post
i like the more gentle heating of a HERMS HEX. Although, a recent post about an electric instant water heater build may have debunked the scorched mash/wort theory. I was thinking the external heat exchanger similar to one in link but all copper. That way i could solder the joints.
Immersion coolers are notoriously inefficient without water movement, so plan on recirculating or stirring if you go that route.

RIMS can be as gentle as you want it to be, either using an appropriate wattage element(easier, proven route) or how you control it (I'm working on this now). The benefit of HERMS, at least in theory and not in practice, is the large surface area allowing you to step temps aggressively to evenly heat the mash quickly without the possibility of scorching. Most implementations of HERMS I've seen don't take full advantage of this; using large reservoirs and/or low wattage elements. A low wattage RIMS would perform just as sufficiently with less parts and space required.

Regarding HERMS, I still like the idea of a high wattage RIMS heater and using a plate style counterflow to exchange the heat, although the issue of clogging may have to be addressed. I plan on testing this out but not until I characterize RIMS and it's ability to step without scorching.
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