Open Source Ecology Heat Exchange Coil Winding, 3 Feb 2012

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From YouTube: Preheater

Description

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A

Okay, so here we're winding, so this is kind of call you call it a preheater, coil yeah.

B

This was just a preheater for the feedwater for a boiler. Mm-Hm.

C

B

You did is they took the exhaust steam from the engine and ran it through a chamber. This was inside a chamber.

B

This is high pressure tubing. So there were, you know there were high pressure fittings welded into the end cap. You.

A

Don't want to do like a small helical one for.

B

B

You could have made two helical ones and put one inside the other yeah.

C

B

This is just what they happen to use. This is out of that Williams car right there yeah.

C

B

Car was built in the 60s.

B

And we we've done a body off restoration on this frame. This frame.

B

There's a condenser and all of this all this tubing has been remanufactured.

B

This is actually underneath the car, so you can't see it yep.

A

B

So it's down and it goes into that chamber and then this is inside, that chamber.

B

Water pump, which is run by the engine and the water, comes out of this tank.

A

Okay: let's go to the winding part.

B

Will do two pair pins on this.

B

Obviously, you have different size dyes for different sized tubing and they're matched code, matched.

B

A

So the block is typically the same and that's you've got yeah they're. All this foreign.

B

A

By two inch and each one of them has done one inch yeah.

B

A

Pretty close, whoo and yeah.

B

They were just two by two and then we had a machine this out to go past. These welds.

B

B

This metal play down there and that just gives strength to the center of your draw point. Yeah.

B

Now this um it's kind of critical pressure, because, if you, if you make it different, your coils are gonna, be looser or tighter, depending on how hard this is clamping your to.

B

You could take up an inch pound, torque wrench and just make sure that it's the same inch pounds every time you pull one through the hole. Drilled is.

A

Exactly what? How would you do that, because you slit.

B

What I did is we drilled before we cut, we machined the block as a whole.

C

B

Cut it into a 2-inch square block and then put it in the mill and got everything square: okay, okay and- and we drilled our to 3/8 holes for this, then we milled this out to clear the welds. Then we flipped it over drilled, the.

C

B

Diameter hole as the pipe.

C

B

Take it over to the bandsaw cut it in half, and that gives you that then actually makes this a smaller diameter. Okay needle clamp on the tube and give you some draw pressure.

A

Yep, okay and then the draw pressure is such that you can't turn it by hand easily nope.

B

To be pretty snug.

A

B

A

And you kind of do it by in by how do you? How do you gauge.

B

B

We're pulling the dies actually kind of they when they come together. The seen kind of looks like a little wedge so when you just get that wedge almost drawn together where it's not a wedge anymore, that's just how I gauged it yep and it's not super critical. But if you get really tight on one and really loose on another you're gonna have some variance in your coil. Your end result in your coil, so.

A

Best would be to maybe basically record how many turns you put on the screws yeah.

B

Or, like I said, use an inch pound, torque wrench yeah.

B

I've never measured it because.

B

The stuff that we're building it's not like you're building of a watch.

B

A

Okay, so let's run this.

B

These the holes drilled in this flange, underneath this plate are quarter 28 so that we have somewhere. We have strength, fine thread, yep quarter, 28, okay and then your coarse thread to bolster quarter 20. You.

C

B

Another 8 threads per inch on your quarter, 28, it's just a stronger, better fastener for a strength, yep.

B

Which way these will all go in.

B

Like I said, these holes aren't exactly ninety ninety degrees of heart.

B

Never marked this one.

B

Feels pretty good right. There.

B

You'll notice, this is a welded plate quarter inch.

B

The weld is up because you need a flat surface on the bottom, for your pipe to clear and not get all scarred up. So that's three inches.

A

B

A total diameter of like 18 or 20 inches 22 inches.

A

That's because.

B

That way you can, you can wind a 22 inch coil. If you want to have one.