DIY Grey Water Heat Recycling... - Page 3

Xringer · 04-10-10, 11:19 AM

Quote:

Originally Posted by Xringer

Edit:
Someone invented the PVC version. Saw it on Ebay.

Waste water Heat exchanger Water Heater Green Energy - eBay (item 170390818624 end time Apr-02-10 19:06:03 PDT)

Today, (April 10, 2010) I got a reply about this Ebay item..

I apologize for the late response but our home burned down. The unit is designed for shower / tub drains, it is 18" long 1.5" drain in and out and 3/4 lines for inlets and outlets. The units is assembles from copper and is soldered. Unit is sealed in PVC and filled with foam to retain the heat. I have tested the units to 80 psi for city water pressure but not higher, I do believe they would hold 100 psi. The flow rate at 60 psi is 4.5 gpm.

- davee4089

AC_Hacker · 04-14-10, 02:13 PM

Here is a scan from a book that is no longer in print:

...the picture tells the story.

The coil shown in the photo is meant to go into a chimney pipe for heat recovery, so the precise internal and external dimensions are not so critical. If the coil was intended to wrap around a waste pipe for heat recovery, the internal diameter of the coil would be critical. When wrapping such a coil, a certain amount of "spring-back" will occur, so some experimentation would be required to make a mandrel (a log in the picture) of such a diameter so that contact between the formed coil and the copper waste water pipe would happen. Then, soldering would really improve the situation.

Regards,

-AC_Hacker

Solaris · 01-10-12, 11:11 PM

I have a good commercial unit, and on inspection can see the copper water pipe was soldered to the copper drain pipe before starting the coil. It was wound so tight, the 1/2" copper looks pressed - with squared edges for extremely tight contact.

sdim · 10-19-13, 04:19 PM

Another embodiment
sdinfo.ru/waste-water-heat-recovery

gspong · 02-24-18, 05:33 PM

necro-ing, because 1/2 copper tubing was on clearance at my local Lowe's for $1.79. Just need to find some cheap copper DWV now.

Don't have enough posts for the link, search for "1/2-in dia x 20-ft L Copper L Coil" to check yours. Was only that price at one store, so ymmv.

oil pan 4 · 02-24-18, 07:49 PM

Here was my take on it.
http://ecorenovator.org/forum/conser...exchanger.html

04-14-10, 02:13 PM	#22
AC_Hacker Supreme EcoRenovator Join Date: Mar 2009 Location: Portland, OR Posts: 4,004 Thanks: 303 Thanked 724 Times in 534 Posts	Making a Copper Coil... Here is a scan from a book that is no longer in print: ...the picture tells the story. The coil shown in the photo is meant to go into a chimney pipe for heat recovery, so the precise internal and external dimensions are not so critical. If the coil was intended to wrap around a waste pipe for heat recovery, the internal diameter of the coil would be critical. When wrapping such a coil, a certain amount of "spring-back" will occur, so some experimentation would be required to make a mandrel (a log in the picture) of such a diameter so that contact between the formed coil and the copper waste water pipe would happen. Then, soldering would really improve the situation. Regards, -AC_Hacker Attached Thumbnails

01-10-12, 11:11 PM	#23
Solaris Uber Effecient Join Date: Feb 2011 Location: Vancouver Island Posts: 18 Thanks: 0 Thanked 2 Times in 2 Posts	I have a good commercial unit, and on inspection can see the copper water pipe was soldered to the copper drain pipe before starting the coil. It was wound so tight, the 1/2" copper looks pressed - with squared edges for extremely tight contact. __________________ Solaris To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

10-19-13, 04:19 PM	#24
sdim Lurking Renovator Join Date: Oct 2013 Location: Russia, Moscow region, Dedovsk Posts: 4 Thanks: 0 Thanked 1 Time in 1 Post	Another embodiment sdinfo.ru/waste-water-heat-recovery Attached Thumbnails

02-24-18, 05:33 PM	#25
gspong Lurking Renovator Join Date: Jan 2009 Posts: 4 Thanks: 0 Thanked 0 Times in 0 Posts	necro-ing, because 1/2 copper tubing was on clearance at my local Lowe's for $1.79. Just need to find some cheap copper DWV now. Don't have enough posts for the link, search for "1/2-in dia x 20-ft L Copper L Coil" to check yours. Was only that price at one store, so ymmv.

02-24-18, 07:49 PM	#26
oil pan 4 Land owner Join Date: Nov 2012 Location: NM Posts: 1,026 Thanks: 12 Thanked 127 Times in 107 Posts	Here was my take on it. http://ecorenovator.org/forum/conser...exchanger.html