# 52 Qt. Coleman Xtreme cooler, need weight and Specific Heat in Btu/Lb. F.

### Help Support Homebrew Talk:

#### Silver_Is_Money

##### Larry Sayre, Developer of 'Mash Made Easy'
Any ideas as to these values?

#### bkboiler

##### Well-Known Member
I have this cooler as well....but I don't think anybody is going to have these numbers (only an estimate).
My suggestion would be to hold it while weighing yourself (and without obviously).
For specific heat, my suggestion would be to take the cooler at room temp and add 5 gallons or so of 160F water and wait 5 minutes for it to equilibrate with the cooler, then stir and take a temp reading. Use this temperature to calculate the specific heat of the cooler.

OP

#### Silver_Is_Money

##### Larry Sayre, Developer of 'Mash Made Easy'
I have this cooler as well....but I don't think anybody is going to have these numbers (only an estimate).
My suggestion would be to hold it while weighing yourself (and without obviously).
For specific heat, my suggestion would be to take the cooler at room temp and add 5 gallons or so of 160F water and wait 5 minutes for it to equilibrate with the cooler, then stir and take a temp reading. Use this temperature to calculate the specific heat of the cooler.
I'm OK with estimates.

#### IslandLizard

##### Progressive Brewing
Staff member
Mod
Using the 52qt Coleman Xtreme:
Here's what I have in my BS2 equipment profile:
Volume: 13 gal
Weight: 24 lbs
Specific Heat 0.30 Cal/gr-°C
I underlet

But I think they're incorrect numbers, and/or incomplete variables/data. For example, there's no entry for heat loss during stirring.

Also, I find heat losses to be much higher when it's half full compared to full. Empty headspace is a total heat drain, I don't see that being taken into consideration anywhere.

For example, on a 5.5 gallon batch of 1.060 grist (12.5 lbs, 82% mash efficiency) I have to add 7°F (w/ preheat) or 14°F (w/o preheat) to my calculated strike water temp. I mash at 1.5 qt/pound of grist.