Subject: Re: Help creating a heating element from resistor.
Date: Wed, 11 Dec 2002 09:22:55 +0000 (UTC)
NNTP-Posting-Date: Wed, 11 Dec 2002 09:22:55 +0000 (UTC)
User-Agent: tin/1.5.14-20020926 ("Soil") (UNIX) (Linux/2.4.19 (i686))
Sam Nichols wrote:
> In article ,
>> Sam Nichols wrote:
>> > nothing. I guess it might be closer to 4 oz which could still work. I
>> > want to vaporize oil for a tiny smoke machine.
>> > Anybody know a place that carries Nichrome in the Bay Area?
>> Oh, it'll work.
>> I'm just unsure as to for how many seconds.
>> My gut says there is no way in hell you'r going to get enough energy from
>> a battery that small to vapourise three times it's weight in oil.
>> However, numbers are good.
>> The first fog generator numbers I found were 20Kw evaporating 40l/hour,
>> or 1Kw=2l/h. Maybe 1Kw/Kg/h.
>> So, 60g of oil...
>> Say you want to use it all in 6 mins.
>> That's 600g/hour.
>> So, you need a power source of 600W.
>> That AA cell won't supply 500A, and it certainly won't do it for
>> 6 minutes.
>> The energy in an AA cell is about a watt hour, so you can evaporate a
>> whole gram of fog. The oil container won't need to be very big.
>> It'll produce about 20 cubic feet of fog a minute for 6 minutes.
> Yah, you're right, I've come to the conclusion that a couple AA batts
> won't do the trick, so I've modified the plan a little. Now I'll be
> sucking off 1-2A from an already existing 8-cell battery pack which
> gives between 10-12V. If anything it'll save me 1.5oz since I won't be
> adding a 2nd battery pack for this smoke generator. Where are you
> getting your numbers from btw? I was looking at some stats for Nichrome
> wire and if I used 40 AWG wire looped around (probably a ceramic or
> metal tube) the chart said I should get roughly 400 deg F out of about
> 13 watts. I only need 240 to smoke my oil so I imagine I could tone it
> down to 10 watts or less which is well within (1-2A)*(10-12V).
If not doing anything.
Oil takes energy to vaporise, I was getting the numbers from someone that
sells large foggers, and was saying 9gallons/hour at 20Kw.
I couldn't find wattage numbers for party foggers.
If you could find those, and maximum fog juice flow, then you can work
out better ones.
Just like your kettle, if you leave it to boil, a 2Kw kettle will take
around 20 minutes to boil away 1l of water, but the element if uncovered
would heat to well over 1000C with the same power.
http://inquisitor.i.am/ | mailto:firstname.lastname@example.org | Ian Stirling.
"When I use a word," Humpty Dumpty said in a rather scornfull tone, "It means
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