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Step Mashing with HERMS

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  • Step Mashing with HERMS

    I'm looking into step mashing for my saisons, etc. My hope is that I'll be able to accomplish this by installing a stainless HERMS coil into my HLT. Has anyone had any success getting reasonable ramp up times between steps using HERMS on a ~1 BBL set-up? If so, what are your specs? Coil length? Diameter? Flow rate through the coil? I have a 3 vessel set-up with 55 gal. Blichmann kettles.

    Thanks!

    Saul Kleinberg
    -----------------------------
    Co-owner/ Head Brewer
    Griffin Hill Farm Brewery
    saul@griffinhillny.com

  • #2
    Hi there,

    I know ss HERMS coil and thermal transfer well, but I do not understand your plan perfectly.
    Can you explain it in detail?

    Sundin

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    • #3
      herms

      We have a herms system on our 1.5bbl system that works fine to hold temp but not for temp changes. we have a 50 ft 5/8" copper coil. whith a chugger pump.

      By our calculations for 30 gal of water in the MT it take roughly 240 BTU to effect a 1 degF temp change which translates to 15,000 btu/hr for a 1 deg per minute temp change. Add to that the heat capacity of the grain and equipment and you might need as much as 25,000 btu/hr heat source. Thats alot of heat to transfer.

      Then there is the matter of liquid circulation. Our chugger pump pumps at best 5 gal/minute. a 7deg difference would yield about 250 BTU/min. The best we can get is 3 deg change and thats if we have the HLT at 180 and are constantly stirring.

      Also the enzymes start to break down as temp reaches 160 so I worry about the temp at the metal/wort interface is dramatically higher tho for a short time. is this a problem?

      It just hasn't worked for us........ yet

      We have thought about adding an inline electric heater and increasing flow ???

      has anyone had success?

      thanks steve

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