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Idea for a water separator/filter system...

1216 Views 10 Replies 6 Participants Last post by  sagebel
Just taking off on the water heater idea what if a water heater was filled with oil and fired up, then run the hot oil through the filters into a well insulated container to sit for the proper time. Of course I would run a course filter before I fill the heater to aviod the big stuff, maby an old shirt or something.
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Should be 24kwh, 4800 wats is 4800 wats no matter what the voltage, howerer the ammount ov energy in an amp changes (is a factor of) wats and volts.

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Um, not exactly. See Ohm's Law.

A 240v 4800w heater has a resistance of 12 ohms. If you change the voltage, the current will change, and since watts = current * voltage, the watts consumed will change. See Ohms Law for the simple version, along with a calculator.

It shows us that this heater, run at 120 volts, will produce/consume 1200 watts. This is because at half the voltage, you'll get half the current (1/2 * 1/2 = 1/4) and 1/4 the power.

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Now comes the weird part. I don't know what the specific heat of veggie oil is (it's specific gravity is 0.92, which gives us about 320 pounds), but a 1200 watt heater is dumping about 4,000 BTU per hour, which would raise 42 gallons of water by about 11 degrees. In an hour. (One BTU will raise one pound of water one degree. 42 gallons = 350 pounds). This is nowhere near hitting 130 in 30 minutes, unless the specific heat of oil is some really oddball number, or the oil was already quite warm to start with. Like, 100 degrees or more. Or, there was significantly less oil than we thought. Or the heater really is running at 240. Or it's really a 120V/4800 watt heater.

Really odd. I'll ponder it some more... /ubbthreads/images/graemlins/shrug.gif /ubbthreads/images/graemlins/sleepy.gif

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Dang. I shouldn't read posts that late. You're right, it's 4800W at 240, and you'd see that kind of temp rise in 30 minutes. Don't know where I came up with the 120v sub-thread.


4800W = 4.8Kw * .5(hours) = 2.4Kwh *.15($ per Kwh) = 36 cents per run.

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