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Old 01-12-2012, 10:02 PM   #1
ruskii
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Question Heating Elements

I am thinking about making an electric brewing system. I've started my planning but I need some clarification on heating elements.

First of all, I need to find a circular heating element. I will have issues using regular stick heating element. I want the heating element to go around the edge of the container on the bottom.

As far as I understand it is preferrable to use Ultra Low density for heating elements. I have a 20 gallon pot in which I want to boil probably around 17 gallons. I am not sure how many watts does the heating element need to have.

Also, I dont understand 100% the concept of PID for heating elements.

Thank you fellow brewers.

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Old 01-13-2012, 01:11 PM   #2
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There is a calculator for volume/watts here
As far as the PID goes, They read temperature IN(from kettle), sent control signals OUT(to a relay or contact) which then turns on or off the element depending on the set point and other parameters entered into the PID. The difference between a PID and say a Johnstone A419 temp controller is that the PID has AI and can decide to turn the power on and off many times per min to keep set temp much more accurate than the just on or off of other refrigeration type controllers. You could read this for more info.
RIMS For Dummies

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Old 01-13-2012, 05:49 PM   #3
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Thanks for the info Stevo.

Do you know of any heating element that is circular in shape versus just a straight line?

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Old 01-13-2012, 06:25 PM   #4
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Quote:
Originally Posted by ruskii View Post
Thanks for the info Stevo.

Do you know of any heating element that is circular in shape versus just a straight line?
The following uses pipe heating tape external to the pipe to raise temp (the heat tape can be wrapped).

http://www.homebrewtalk.com/f51/elec...eherms-293810/

I use two for a total of 1248 watts on 120V, 10.4 Amps required.
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Old 01-16-2012, 03:54 PM   #5
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Quote:
Originally Posted by ruskii View Post
Thanks for the info Stevo.

Do you know of any heating element that is circular in shape versus just a straight line?
that is not a standard size/shape, so if you were to find one, it wouldnt be anywhere near the $10-20 that common, mass produced elements are. and the chances of finding one that is the diameter and power rating that you want is almost zero, unfortunately. if you wanted to spend $150-250 per element, you could have them custom made.
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Old 01-17-2012, 10:35 PM   #6
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Quote:
Originally Posted by audger

that is not a standard size/shape, so if you were to find one, it wouldnt be anywhere near the $10-20 that common, mass produced elements are. and the chances of finding one that is the diameter and power rating that you want is almost zero, unfortunately. if you wanted to spend $150-250 per element, you could have them custom made.
Agreed. After you mentioned it I looked and all I found was dry circle elements. They was one that was dry or wet and could be formed in any shape. I'll try to post a link later.
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Old 01-18-2012, 02:02 PM   #7
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Quote:
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First of all, I need to find a circular heating element. I will have issues using regular stick heating element. I want the heating element to go around the edge of the container on the bottom.
This is impractical. Why can't you use one of the heating elements that everyone else is using?
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Old 01-18-2012, 04:08 PM   #8
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You can get 3kw bend to shape heating elements for about $55 each from the UK that would do what you want, but shipping will not be cheap. That and you'll probably need at least two to boil 17 gallons, and maybe even three.

HE7230 72" / 6ft LONG 3000 watt 3kw ROD HEATING ELEMENT | eBay

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Old 01-18-2012, 05:24 PM   #9
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You can get 3kw bend to shape heating elements for about $55 each from the UK that would do what you want, but shipping will not be cheap.
those are interesting, albeit expensive at $100 each, shipped... wonder what voltage they are though, it doesnt say.
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Old 01-18-2012, 06:17 PM   #10
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220-240v per the auction. I also forgot to mention, that you need to purchase the "gland" kits in order to mount these to your kettle too!

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