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Author Topic: Copper tubing for wall heat?  (Read 572 times)

mlappin

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Re: Copper tubing for wall heat?
« Reply #15 on: January 28, 2020, 07:33:14 AM »

Emissivity of pex is actually higher than copper. I think so anyway because of coppers shiny surface.

Really? I kinda figured its backwards, pex with 180 degree water in it can be grabbed, donít want to grab copper with the same water in it.

Hmmm, course pour cement over pex all the time, Ultra fin and staple up all use pex...
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mlappin

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Re: Copper tubing for wall heat?
« Reply #16 on: January 28, 2020, 07:44:17 AM »

Good ole engineering tool box, shiny (polished)  copper has a emissitivity of .023-.025 while heavily oxidized copper is .78.

They donít list pex, but most plastics are over .90.


https://www.engineeringtoolbox.com/emissivity-coefficients-d_447.html
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hoardac

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Re: Copper tubing for wall heat?
« Reply #17 on: January 28, 2020, 02:35:22 PM »

You could always hide a good sized loop of it behind a homemade frame art work thing. They can print just about anything on material toady. It will be right in the room for maximum heat transfer.
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mlappin

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Re: Copper tubing for wall heat?
« Reply #18 on: January 28, 2020, 05:11:38 PM »

You could always hide a good sized loop of it behind a homemade frame art work thing. They can print just about anything on material toady. It will be right in the room for maximum heat transfer.

Thats an interesting suggestion, except we are taking the lathe and plaster off the office side anyways.

Want numerous outlets, along with ethernet and phone jacks on every wall.
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juddspaintballs

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Re: Copper tubing for wall heat?
« Reply #19 on: January 28, 2020, 06:06:52 PM »

Just thinking out loud here, but what about 2 or 3 water to air heat exchangers mounted in that stud space, tied together in series and use those as your copper slinky?  That should offer a ton of surface area for the air to convect across and probably transfer more heat. 
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mlappin

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Re: Copper tubing for wall heat?
« Reply #20 on: January 29, 2020, 07:37:40 AM »

Iíve got to thinking about this, before I redid all my plumbing in the basement had maybe 50í of 1Ē pex down there. Have almost twice that in copper now, had to add baseboard heaters down there, was never chilly before with the pex. Course, I moved quite a bit around and the longest loop is a secondary to the furnace HX.

Just thinking out loud here, but wonder if it changes how much heat copper would give off if it was painted black like car radiators?
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wreckit87

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Re: Copper tubing for wall heat?
« Reply #21 on: January 30, 2020, 03:45:09 PM »

Copper definitely has more conductivity than pex, but emissivity I don't know. I'd think it's also more or they'd be making radiators out of plastic by now instead of copper? Same theory for the paint, I'd think that would hurt emission more than help. I was always under the impression that copper/brass automotive radiators were painted solely for corrosion purposes. Notice most aluminum rads in today's vehicles are unpainted
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mlappin

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Re: Copper tubing for wall heat?
« Reply #22 on: January 30, 2020, 08:59:21 PM »

Copper definitely has more conductivity than pex, but emissivity I don't know. I'd think it's also more or they'd be making radiators out of plastic by now instead of copper? Same theory for the paint, I'd think that would hurt emission more than help. I was always under the impression that copper/brass automotive radiators were painted solely for corrosion purposes. Notice most aluminum rads in today's vehicles are unpainted


https://www.engineeringtoolbox.com/emissivity-coefficients-d_447.html
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E Yoder

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Re: Copper tubing for wall heat?
« Reply #23 on: January 31, 2020, 06:18:56 AM »

Thinking carefully hree, are there actual copper radiators? I think the reason copper baseboard works is the convection currents that go up through the aluminum fins. Copper conducts very efficiently to the fins so it works, same with a hot air coil.
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RSI

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Re: Copper tubing for wall heat?
« Reply #24 on: January 31, 2020, 07:34:06 AM »

Copper definitely has more conductivity than pex, but emissivity I don't know. I'd think it's also more or they'd be making radiators out of plastic by now instead of copper? Same theory for the paint, I'd think that would hurt emission more than help. I was always under the impression that copper/brass automotive radiators were painted solely for corrosion purposes. Notice most aluminum rads in today's vehicles are unpainted


https://www.engineeringtoolbox.com/emissivity-coefficients-d_447.html

That list is at 80 degrees. I am guessing the copper would be a lot higher at 180 than pex.
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« Last Edit: January 31, 2020, 07:53:04 AM by RSI »
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mlappin

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Re: Copper tubing for wall heat?
« Reply #26 on: February 01, 2020, 10:08:30 AM »

Iím thinking doing two bays anyways, iíll do one in copper and the other in pex and measure the output at the top register. I was going to line the bays with foil insulation anyways, can staple some over the bays  to close em off for a quick test before the drywall goes on.
« Last Edit: February 06, 2020, 10:14:31 PM by mlappin »
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mlappin

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Re: Copper tubing for wall heat?
« Reply #27 on: February 06, 2020, 10:17:56 PM »

Just thinking out loud here, but what about 2 or 3 water to air heat exchangers mounted in that stud space, tied together in series and use those as your copper slinky?  That should offer a ton of surface area for the air to convect across and probably transfer more heat.

Actually I was messing around on Supplyhouse and came across replacement H1 elements with jumbo fins, stack em three high and output is over 1700btu/ft instead of 580ish/foot. Wonder what the diminishing returns are? Would a fourth one in the stack add any more BTUís or do they figure by time the air hits the top one its as hot as itís gonna get?

Didnít want to mess around with dozens of elbows to do that, however I have a swedging tool somewhere for an air chisel.
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mlappin

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Re: Copper tubing for wall heat?
« Reply #28 on: March 13, 2020, 10:59:15 AM »

Still working on finishing up the office, did three stud bays with a minimum of 75í of 1/2Ē pex in each one then have a 4x10 register in the top and bottom of each bay, all I can say is it works better than I could have hoped. Room is slightly under 12í x 15í and raised it 5 degrees in just over an hour.
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E Yoder

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Re: Copper tubing for wall heat?
« Reply #29 on: March 14, 2020, 10:42:48 AM »

Very interesting.
Is there a noticable breeze coming out of the top register? What temps?
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