EcoRenovator  

Go Back   EcoRenovator > Improvements > Conservation
Advanced Search
 


Blog Register 60+ Home Energy Saving Tips Recent Posts Search Today's Posts Mark Forums Read


Reply
 
Thread Tools Display Modes
Old 06-12-14, 11:45 AM   #1
Elwin
Lurking Renovator
 
Join Date: Jun 2014
Location: Germany
Posts: 20
Thanks: 0
Thanked 0 Times in 0 Posts
Default Grey Water Recycling using a household radiator

So I live in a rental apartment and do not want to renovate the whole shower, but since the hot water pressure in the building is very low and wish to save on my gas bill something needs to be done.

Shower heat recovery comes in a few flavours, the vertical pipes, horizontal pipe ect ect. Since I'm not planning on renovating the shower itself these options are not possible. Then there is this guy who built a new shower floor with a heat exchanger under it, I think the project is called Meander HR. For me this seems to be the most viable option, but the costs of such a system are still around the $200 mark. One of the most straightforward heat exchangers is a simple house radiator which can be cheaply picked up at any online market place (sometimes even for free). Some radiators have a flat surface on which, I hope, I can easily stand (Maybe the surface needs to be roughened up a bit). Then boxing it in and connecting the cold water line to it.

I bet there are many reasons not to do it like this, but maybe it is not such a strange idea after all

Elwin is offline   Reply With Quote
Old 06-12-14, 12:35 PM   #2
Daox
Administrator
 
Daox's Avatar
 
Join Date: Aug 2008
Location: Germantown, WI
Posts: 5,471
Thanks: 1,110
Thanked 367 Times in 298 Posts
Default

Welcome to the site Elwin!

That is an interesting idea. Do you have an image of this heat exchanger you're thinking of using? I can't seem to picture it.
__________________
Current project -
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
&
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Daox is offline   Reply With Quote
Old 06-12-14, 01:14 PM   #3
AC_Hacker
Supreme EcoRenovator
 
AC_Hacker's Avatar
 
Join Date: Mar 2009
Location: Portland, OR
Posts: 4,002
Thanks: 303
Thanked 712 Times in 532 Posts
Default

Quote:
Originally Posted by Elwin View Post
...Then there is this guy who built a new shower floor with a heat exchanger under it...
Elwin,

How about this:


This would go directly on your shower floor, preferably under an attractive wooden grate, upon which you would be standing.

Assuming you have access to the cold water flow before it gets to the temperature mixing valve, prior to the shower head, divert the water, prior to the mixing valve, and run it through the copper coil at "A", then take the water flow from point "B" and connect that back to your cold water that is flowing into the mixing valve.

The warm shower water would fall upon the copper coil, pre-warming the incoming cold water component of your shower water. You would be able to reduce the hot water level until an ideal shower temperature was achieved, thereby saving energy & money.

NOTE: I have a demand water heater, and I have it adjusted so that it only heats water up to shower water temperature, for me, that would be 104F. Most people use excessively-hot water, and they then mix enough cold water with it, that it is at the right temperature. This copper coil idea would be perfect for those people.

Best,

-AC_Hacker
Attached Thumbnails
Click image for larger version

Name:	shower-floor-loop.jpg
Views:	899
Size:	41.8 KB
ID:	4420  
__________________
I'm not an HVAC technician. In fact, I'm barely even a hacker...

Last edited by AC_Hacker; 06-12-14 at 01:29 PM..
AC_Hacker is offline   Reply With Quote
Old 06-12-14, 03:42 PM   #4
Elwin
Lurking Renovator
 
Join Date: Jun 2014
Location: Germany
Posts: 20
Thanks: 0
Thanked 0 Times in 0 Posts
Default

@daox I couldn't post pictures so that's why. The project I saw was called meandherhr I believe, but I thought of something like this

Just a simpel Household radiator.

@ac-hacker i like the idea since it's simple to build, but I'm afraid a lot of dirt and grit like hairs will get stuck in between it. I also have a demand heater, but would setting the temp of the heater make more sense then reusing the heat. The heater is like 1m from the shower and has isolated lines.

Last edited by Elwin; 06-12-14 at 05:06 PM..
Elwin is offline   Reply With Quote
Old 06-13-14, 02:59 AM   #5
AC_Hacker
Supreme EcoRenovator
 
AC_Hacker's Avatar
 
Join Date: Mar 2009
Location: Portland, OR
Posts: 4,002
Thanks: 303
Thanked 712 Times in 532 Posts
Default

Quote:
Originally Posted by Elwin View Post
...I also have a demand heater, but would setting the temp of the heater make more sense then reusing the heat...
I haven't done any experiments on comparing the two approaches, but my intuition tells me that setting the demand heater temperature setting lower, to shower temperature would be the most economical.

I am amazed how thrifty a gas demand heater is, when it is set properly. I take a long hot shower every day, at least once, and sometimes more, and my gas use charges are lower than the charge to read the gas meter.

-AC

__________________
I'm not an HVAC technician. In fact, I'm barely even a hacker...
AC_Hacker is offline   Reply With Quote
Reply


Tags
grey water recycling

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 11:46 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Ad Management by RedTyger
Inactive Reminders By Icora Web Design