Ok so the average home uses 14% of total energy consumed to heat water, 90% of which goes down the drain. Hotels, dorms etc with lots of showers can clearly save more than a single home, but this is a cheap thing to do. Simple countercurrent exchanger on the shower drain, and insulate the shower drain to prevent heat loss before the exchanger.
Here is a report I found on one simple design: http://www.gfxtechnology.com/Femp.pdf On Apr 8, 2016 6:51 AM, "Curt Raymond via Mercedes" <[email protected]> wrote: > I have my doubts about the potential energy retained vs the energy > required to get it. The water coming down the drain will never be that hot > and you don't have much time to extract heat from it... > -Curt > > From: Karl Wittnebel via Mercedes <[email protected]> > To: "mercedes@okiebenz com" <[email protected]> > Cc: Karl Wittnebel <[email protected]> > Sent: Friday, April 8, 2016 12:23 AM > Subject: [MBZ] hot water heat exchangers WAS Yet even more dishwasher talk > > Anybody rig up a heat exchanger between the drain water and cold water > supply of a shower? They are not too hard to fabricate from copper pipe. > Thinking to put some in. Could also be done between any hot water drain and > the inlet to hot water heater I suppose. Just thinking to save some energy > over the life of the plumbing (and not run out of hot water as fast as > otherwise would be the case). > > Karl > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > > > > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
