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Postby jawbox » Mon Jan 08, 2007 6:29 pm

sloth,

I did the same thing here. Left the lid off for the first 5 mins as I would normally do this doughing in. Then it was lid on for the remaining 60 mins. As others have said I usually only see a small 1-2 deg loss during an actual mash. Looks like I will be tweaking when I brew the next AG batch. I'm sure the lower drop in real world situation can be attributed to the larger mass due to grains being present in the tun.

Later,
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Postby slothrob » Tue Jan 09, 2007 10:20 am

Jaw, I also covered the tun for the final 60 minutes of calibration, if that wasn't clear.

Bill, I see the logic behind considering that leaving the cover off for the first 5 minutes might be undesairable, as it might throw off thermal mass calculations. However, it appears that my calibration, even with the cover off, undercalculated my thermal mass since i undershot my mash temperature. I should stress that I usually hit my mash temperature +/- 1
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Rubbermaid 5 gal. Beverage Cooler Mash/Lauter Tun

Postby mrocco » Sat Jul 07, 2007 12:59 am

CALIBRATION MEASURMENTS:

NOTE: This includes my 1/2" copper pipe manifold.

SHAPE: Circular
WIDTH: 10"
LENGTH: 10"
HEIGHT: 15" (estimated with lid on)
DEAD SPACE: 0.25 gal.

ENVIRONMENT: 78 deg. F
INFUSION VOL.: 5 gal.
INFUSION TEMP.: 153 deg. F
TEMP AFT 5: 150 deg. F
TEMP AFT 65: 147 deg. F
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5 g Rubbermaid bev. cooler tun/SS braid/copper pickup tube

Postby slothrob » Sun Jul 08, 2007 11:29 am

I arrived at similar numbers and have a very similar setup to mrocco:

5 g Rubbermaid round beverage cooler mash tun, but with a SS braid attached to a copper pickup tube.

CALIBRATION MEASURMENTS:
NOTE: 4" length of 3/8" copper pickup tube and ~12" Stainless Steel braid.

SHAPE: Circular
WIDTH: 10"
LENGTH: 10"
HEIGHT: 16"
DEAD SPACE: 0.12 gal.

ENVIRONMENT: 61.7 deg. F
INFUSION VOL.: 3 gal.
INFUSION TEMP.: 170.0 deg. F
TEMP AFT 5: 163.0 deg. F
TEMP AFT 65: 155.5 deg. F

My calibration derived a Heat Capacity of 3.3 J/g K and a Heat Transfer Coefficient of 2.5 W/m2 K, using 3 gal of 170
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Equipment Profiles

Postby lathe » Tue Sep 18, 2007 9:53 pm

Hey guy,

This is just a nudge on the equipment profiles topic.
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32 qt. Aluminum Boil Kettle

Postby slothrob » Wed Sep 19, 2007 7:46 am

32 qt. Aluminum Boil Kettle

Shape: Circular
Width: 13.75 in
Length: 13.75 in
Height: 12.75 in
Capacity: 8.2 gal
Dead Space 0 gal or 0.12 gal if siphoning to minimize trub transfer
Heat Capacity: 4883.5 j/kg k
Heat Xfer Coefficient: 12.96 w/m2 k

Calibration:
Environment: 61.7 f
Infusion Volume: 3.0 gal
Infusion Temp: 147.5 f
Temp After 5 Minutes: 139.5 f
Temp After 65 minutes: 120.1 f
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Heat source: Electric stove

Postby slothrob » Wed Sep 19, 2007 9:20 am

Electric Stove :

Heat transfer 1.82 kw

Calibration:
Environment: 61.7 f
Calibration Volume: 3.0 gal
Vessel Heat Capacity: 4883.5 j/kg k
Time to Heat 18
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Postby warthog » Wed Sep 19, 2007 1:51 pm

Heat Source:

electric turkey fryer-

heat transfer: 1.76 kw
environment: 70 f
calibration volume:6 gallons
vessel heat capacity: 8181.0 J/kg k
time to heat 18 f (10 c): 9.0 minutes

Vessel:
electric turkey fryer

shape: circular/eliptical
width: 13.5 inches
length: 13.5 inches
height: 12 inches
capacity: 7.4 gallons
dead space: 0.0
heat capacity: 8181.0 j/kg k
heat transfer coefficient: 26.6 w/m2 k

calibration

environment: 70.0 f
infusion volume 6 gallons
infusion temp 196 f
temp after 5 minutes: 186 f
temp after 65 minutes: 142 f


Vessel

5 gallon rubbermaid cooler

shape: circular/eliptical
width: 10 inches
length: 10 inches
height: 16 inches
capacity: 5.4 gallons
dead space: 0.0
heat capacity: 799.7 j/kg k
heat transfer coefficient: 1.7 w/m2 k

calibration

environment: 70.0 f
infusion volume 1.5 gallons
infusion temp 162 f
temp after 5 minutes: 159 f
temp after 65 minutes: 150 f

hope this helps.
as mentioned in the other thread, when i have grain inside, it seems that i maintain temperature better than predicted by btb. btp predicts that i will loose something like 5 deg f over a 1 hour mash, yet i only loose about 1 deg f in reality. does btp take into account the thermal mass of the grain?
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Propane Burner

Postby slothrob » Wed Sep 19, 2007 5:23 pm

Propane Burner (Blow-torch style):

Heat Transfer: 1.942 kw

Calibration:
Environment: 42.0
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Postby TCBrewguy » Sun Mar 23, 2008 9:02 am

For those who have posted their MLT specs, are your temperature changes based just on a water infusion or an actual mash? I did a water infusion yesterday to test my equipment and noticed a dramatic drop (10 degrees) in temperature over a 60 minute period. The most I ever lose during an actual mash -- with water AND crushed grain -- is 1-2 degrees. What I'm getting at is this: should I be measuring my MLT specs based on an actual mash rather than just water infusion? That would seem to make more sense to me since I lose far less heat over time due to a denser thermal mass. If so, would the infusion volume still be just the water added or would I have to account for the water and the grain?

This is the first time I've tried using the schedule feature.

Thanks.
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Coleman Extreme?

Postby dasein668 » Wed Jul 02, 2008 8:47 am

Hey, has anyone run calibration for a Coleman Extreme 70qt cooler? I just got one and haven't had a chance to calibrate it yet. Thought I'd check here first...
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Postby reddart » Thu Jul 03, 2008 3:45 pm

I have a 52 Q extreme, and these are my values (might get you in the ballpark to start out):


capacity: 48.2 Quarts
dead space: 1.5 Gallons
heat capacity: 14681.5 j/kg k
heat transfer coefficient: 0.7 w/m2 k

calibration

environment: 67.0 f
infusion volume 4.2 gallons
infusion temp 172 f
temp after 5 minutes: 153 f
temp after 65 minutes: 151 f
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Postby dasein668 » Thu Jul 03, 2008 4:43 pm

Thanks!
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Equipment profiles

Postby lathe » Mon Sep 01, 2008 4:58 pm

Hey,

Just a bump on this topic.
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Postby jawbox » Tue Sep 02, 2008 7:06 pm

Here's a couple of screen shots with two of m mash tuns

10gal Igloo Beverage Cooler
15gal Ice Cube Cooler

http://picasaweb.google.com/hopdevil73/Beertools#
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