Diggy
Member
- Joined
- Jul 14, 2015
- Messages
- 18
- Reaction score
- 0
I am trying to plan a new electric system and have seen a lot of people post that they are using 240v elements and running them as 120v in their rims tubes to make them extra ultra low watt density elements. However when I do the math, it seems like it would take forever to raise a step mash or do a mash out.
1 gallon of water weights 8.34 lbs so by definition it takes 8.34 BTU to raise one gallon of water 1 degree F
A 5500 Watt 240v element will be about 1375 Watts at 120v and will dump 4691 BTU / hour, or 78 BTU / minute into your RIMS tube
assuming 75% of the energy goes into your wort (due to temp losses to environment) and a 10 gallon batch going from 152 deg F to 168 deg F will take 23 minutes:
[78 btu min]*.75 = 58.5 effective btu
58.5/10 gallons = 5.85
5.85/8.34 = 0.7 degrees / minute
(168-152)/0.7=23 Min
That seems like an extremely long time, and most of your enzymes would be denatured by that point. If my math is wrong, and that efficiency is just a guess, just let me know.
If you are using 120v in your RIMs tube, are you just using it to stabilize a singe mash temperature? Or doing step mashes and raising to mash out? If so how long does it take you?
If you are using 240v in your RIMs tube, what element are you using and have you had any scorching issues?
1 gallon of water weights 8.34 lbs so by definition it takes 8.34 BTU to raise one gallon of water 1 degree F
A 5500 Watt 240v element will be about 1375 Watts at 120v and will dump 4691 BTU / hour, or 78 BTU / minute into your RIMS tube
assuming 75% of the energy goes into your wort (due to temp losses to environment) and a 10 gallon batch going from 152 deg F to 168 deg F will take 23 minutes:
[78 btu min]*.75 = 58.5 effective btu
58.5/10 gallons = 5.85
5.85/8.34 = 0.7 degrees / minute
(168-152)/0.7=23 Min
That seems like an extremely long time, and most of your enzymes would be denatured by that point. If my math is wrong, and that efficiency is just a guess, just let me know.
If you are using 120v in your RIMs tube, are you just using it to stabilize a singe mash temperature? Or doing step mashes and raising to mash out? If so how long does it take you?
If you are using 240v in your RIMs tube, what element are you using and have you had any scorching issues?