Home Brew Forums > Heating capacity by wattage over time

10-25-2012, 07:53 PM   #1
Senior Member
Feedback Score: 0 reviews
Recipes

Join Date: Apr 2009
Location: Minneapolis, MN
Posts: 219
Liked 18 Times on 16 Posts
Likes Given: 7

 Heating capacity by wattage over time

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
Goat's Breath Brewing
Feedback Score: 0 reviews

Recipes

Join Date: Oct 2008
Location: Keyrock, WV
Posts: 537
Liked 21 Times on 21 Posts
Likes Given: 7

Try this calculator http://gnipsel.com/beer/software/calculators/electric-heat.xls

10-26-2012, 05:59 PM   #3
Feedback Score: 0 reviews

Recipes

Join Date: Nov 2009
Location: Cleveland
Posts: 813
Liked 17 Times on 15 Posts
Likes Given: 23

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

10-26-2012, 06:19 PM   #4
Feedback Score: 0 reviews
Recipes

Join Date: Apr 2011
Location: ., Connecticut
Posts: 1,453
Liked 29 Times on 29 Posts
Likes Given: 1

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
Feedback Score: 0 reviews
Recipes

Join Date: Jan 2009
Location: Richardson, TX
Posts: 1,444
Liked 29 Times on 27 Posts
Likes Given: 9

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

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