Built an inline oil heater for the CF

Collecting, filtering and dewatering of WVO SVO vegetable oil. For Biodiesel producers too.

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Built an inline oil heater for the CF

Postby mankypro » Thu Apr 15, 2010 8:06 pm

I used 1-1/4" black iron pipe and screwed (2) 4500w 220v low density elements into either side using T's. They're wired to 110v. Looks like I'm only increasing temps (50 gallons in drum) at the rate of .5 degrees F per minute. Ambient temps are about 60F right now, that means 100F to increase to be able to CF - the temps of the oil at the bypass form the pump is only a couple of degrees higher than the drum temp.

That's 3 -1/3rd hour to bring the barrel to temp. Sound like what others are experiencing?

I was thinking that the output would be might higher, until it hit the mass of cooler oil in the drum.

Since many of you have a Sunwizard inspired heater like mine, I was wondering what rate your oil climbs in temp and what temp the output of the heater is for you with most of the oil at cooler temps.
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Postby SunWizard » Fri Apr 16, 2010 8:00 am

The CF starts working at 100F, not 160. You don't need to heat the entire barrel, thats one of the big advantages to an inline heater. I start my CF when the output of the heater is 100F, which takes about 30 minutes with 60F starting temp on a 50 gallon batch. I get a gain of about 20F across the same size heater at 1.5gpm. Whats the flow rate of your pump?

Here is the computed gain you should get at 1.5gpm, not counting heat loss:
1 watt = 3.4 BTU/hour. 1 BTU raises 1 pound water by 1F per hour. So your 2250w=7650 BTU/8 pounds/gal=956F/90gphx2 specific heat for VO=21F gain across the heater. This is very close to my experience.

This heats my batch from 60 to 80F in 30-40 minutes, and then add the 20F gain across the heater and I am at 100F at the CF and good to start.
Last edited by SunWizard on Fri Apr 16, 2010 8:23 am, edited 1 time in total.
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Postby mankypro » Fri Apr 16, 2010 8:22 am

2.2 GPM Max, Max Operating PSI 100, Port Size 1/4 In, 400 Max SSU, GPM @ Freeflow 2.2, @ 40 PSI 1.9, @ 80 PSI 1.5, Max Temp 210 F

I've been using an IR thermo, I gain about 30F an hour, which is close to your calcs. Previous to this I've always had the elements IN the barrels, and heated the whole thing to 160F before CFing. Based on starting at 100F looks like a 4 hour run, from heater on to finish should do me fine.

Thanks
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