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jawbox
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Post by 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,
Jaw
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slothrob
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Post by 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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mrocco
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Rubbermaid 5 gal. Beverage Cooler Mash/Lauter Tun

Post by mrocco » Sat Jul 07, 2007 1:59 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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slothrob
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5 g Rubbermaid bev. cooler tun/SS braid/copper pickup tube

Post by slothrob » Sun Jul 08, 2007 12:29 pm

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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lathe
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Post by lathe » Tue Sep 18, 2007 10:53 pm

Hey guy,

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

Post by slothrob » Wed Sep 19, 2007 8:46 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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slothrob
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Heat source: Electric stove

Post by slothrob » Wed Sep 19, 2007 10:20 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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Post by warthog » Wed Sep 19, 2007 2:51 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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slothrob
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Propane Burner

Post by slothrob » Wed Sep 19, 2007 6:23 pm

Propane Burner (Blow-torch style):

Heat Transfer: 1.942 kw

Calibration:
Environment: 42.0
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Post by TCBrewguy » Sun Mar 23, 2008 10:02 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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dasein668
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Coleman Extreme?

Post by dasein668 » Wed Jul 02, 2008 9:47 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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Post by reddart » Thu Jul 03, 2008 4:45 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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Post by dasein668 » Thu Jul 03, 2008 5:43 pm

Thanks!
Nathan

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lathe
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Post by lathe » Mon Sep 01, 2008 5:58 pm

Hey,

Just a bump on this topic.
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jawbox
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Post by jawbox » Tue Sep 02, 2008 8:06 pm

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

10gal Igloo Beverage Cooler
15gal Ice Cube Cooler

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