Bob Hansen

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Practical Application of Lauter tun Theory
Bob Hansen Briess Malt Ingredients Co. 2008
MBAA
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Lauter tun theory

• What is a Lauter tun?

A filter
An extraction (leaching) device
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Lauter tun Objectives

• Speed of separation
• Theory of filter flow

Separation efficiency Theory of extraction
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Basic Equations and Terminology

• Modified Darcy Equation

Q K A ?P µ L Where Q Wort Flow K Mash bed
permeability A Lauter tun area ?P
Pressure Drop Across Bed µ Wort Viscosity L
Bed Depth
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Application of filter theory
Q K A ?P µ L
µ Wort Viscosity
25 increase
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Application of filter theory
Q K A ?P µ L
µ Wort Viscosity
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Plato
Flow rate
Gallons
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Application of filter theory
Q K A ?P µ L
L Bed Depth
L a Batch Size
L Bed Volume / A
Q K A2 ?P µ Bed Volume
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Application of filter theory
Q K A ?P µ L
?P Pressure Drop Across Bed
?P gt 10 Inches Lead to Bed collapse
Limited to a few PSI by height of Liquid
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Sparge rate
Plato
Flow rate
Gallons
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Application of filter theory
Q K A ?P µ L
A Lauter Tun Area
Ensure Clean and Unblocked Screens to Maximize A
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Application of filter theory
Q K A ?P µ L
K Bed Permeability
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Extraction/ Leaching theory
Liquid Mixing/Diffusion
Plato
Particle Diffusion
Gallons
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Extraction/ Leaching theory
Extraction Loss a 1/n
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Example

• I normally make 10 Plato beer (16 Plato first
  worts) and collect initially at 10 gallons per
  minute.
• Im going to make a 20 Plato beer with 24 Plato
  first worts.
• What can I expect?

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Basic Equations and Terminology
Q K A ?P µ L
µ Wort Viscosity
1.51
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Example
Q K A ?P µ L
L(new) 2 L (old)
µ (new) 1.5 µ(old)
Youde expect to have ?Ps 3 times higher than
you normally experience
May want to run off first worts much slower
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ThankYou
Bob Hansen Briess Malt Ingredients Co. Chilton,
Wisconsin USA 2008 MBAA