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Dan Cook
Joined: 14 Jan 2015 Posts: 12 Location: Seattle
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Link Posted: Wed Sep 27, 2017 2:47 pm Post subject: What constitutes ULWD vs LWD? |
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If one heating element has a watt density of 50 watts per square inch, and another has a value of 100 watts per square inch, is the first considered ULWD and the second one is not? I assume there isn't a hard line between the two types but I'm wondering if there is a generally accepted range. And perhaps more importantly, a watt density value above which an element is likely to cause scorching if used in the boiler.
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kal Forum Administrator
Joined: 12 Dec 2010 Posts: 11116 Location: Ottawa, Canada
Drinking: Pub Ale, Electric Creamsicle, Mild, Pliny the Younger, Belgian Dark Strong, Weizen, Russian Imperial Stout, Black Butte Porter
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Link Posted: Wed Sep 27, 2017 5:44 pm Post subject: |
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ULWD is 50W per square inch (7.8W per square cm) or less.
The brand name Camco ripple heating elements we sell that are made for brewing are definitely "ULWD" as labelled Camco while the non-ripple as labelled as "LWD".
There's "HWD" as well. I'm not sure what the wattage per sq inch cutoff is to go from LWD to HWD, so I don't know what 100 W per square inch would be rated as.
Quote: | And perhaps more importantly, a watt density value above which an element is likely to cause scorching if used in the boiler. |
There's no "one" answer. I know brewers who brew fine with HWD elements, and others with ULWD elements who scorched because they never cleaned their elements and stuff baked on. The higher the watt density, the easier it is to scorch based on possibly not cleaning properly or even using wort that is full of protein, silt, or possibly other things.
Best to keep it as low as possible when wort is concerned, which is why we recommend ULWD made for brewing.
These ones here: http://www.theelectricbrewery.com/stainless-steel-heating-elements
Kal
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