Heating capacity by wattage over time - Home Brew Forums

 Home Brew Forums > Heating capacity by wattage over time

10-25-2012, 07:53 PM   #1
mbauer013
Recipes

Apr 2009
Minneapolis, MN
Posts: 285
Liked 25 Times on 23 Posts

Does anybody know where I can find an appropriate calculator to help me determine load capabilities of a heating element? I am trying to determine if it is possible to build a system that uses a RIMS tube to heat the strike and sparge water within a reasonable time frame.

I am thinking something my wife could start when she gets home from work and two or three hours later would have a specific volume up to temp. I know the math for btu's into water but I need to calculate watts into BTUs.

10-26-2012, 02:27 PM   #2
ChuckO

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Oct 2008
Keyrock, WV
Posts: 1,028
Liked 148 Times on 106 Posts

Try this calculator http://gnipsel.com/beer/software/cal...ctric-heat.xls

10-26-2012, 05:59 PM   #3
itsme6582

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Nov 2009
Cleveland
Posts: 883
Liked 29 Times on 26 Posts

That's a great spreadsheet. Full of good info.

10-26-2012, 06:19 PM   #4
audger
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Apr 2011
., Connecticut
Posts: 1,497
Liked 44 Times on 42 Posts

a good rule of tumb for doing things in your head is 1000w = 3400BTUs

and for those that dont know the BTU calculation its:
(weight of water, in pounds) x (end temp - start temp, in degrees F) = BTUs required
or
(#gallons) x (8.3) x (temperature change, in degrees F) = BTUs required

10-26-2012, 11:53 PM   #5
DeafSmith

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Jan 2009
Richardson, TX
Posts: 1,448
Liked 34 Times on 32 Posts

1 kW = 3412 BTU per hour
or
1 kW hour = 3412 BTU

watts are a measure of power, BTU is a measure of energy.