[bldg-sim] Heat recovery: Any data on central water/sewer drain line temperatures from multi-family buildings?

[Brian Thornton]

As a follow up I wanted to thank everyone who replied.

 

GFX and PowerPipe both offer a range of heat recovery units that can tie in
directly to single showers or to drain risers of varying sizes.  The web
sites can be found with a search.  I understand there may be some industry
dispute going on in this product area about distribution and technology to
be aware of. 

 

No one had a source of data on drain line temperatures, particularly for
mixed flow, that is not just showers.  I would still like this, since at
times, separating out showers on separate stacks costs extra, and if the
mixed drain temperatures are significantly above the domestic water supply
temperatures, reasonable heat recovery may be possible there. 

 

For my project, we are going to have dedicated shower drain stacks, which
are combined on multiple floors, to 6 stacks, at 3" diameter and heat
recovery units are available for this.  I am still determining how this will
work out in connecting to our two central domestic water heater locations,
and the paybacks. 

 

Thanks,

 

Brian Thornton

 

Thornton Energy Consulting

p. 503-231-6600 f. 503-231-3555

thorntonenergy at comcast.net

 

  _____  

From: bldg-sim at gard.com [mailto:bldg-sim at gard.com] On Behalf Of Brian
Thornton
Sent: Friday, September 23, 2005 6:02 AM
To: bldg-sim at gard.com
Subject: [bldg-sim] Heat recovery: Any data on central water/sewer drain
line temperatures from multi-family buildings?

 

I am looking for information on the temperatures of the waste water leaving
multi-family buildings.

 

We have looked at drain heat recovery at individual showers and units, and
found the space requirements (and placement of heat recovery equipment in
some other tenant/owner spaces) to be too big an obstacle.

 

I am wondering if there is enough heat to consider central heat recovery off
of the combined drain lines to pre-heat domestic hot water make-up.

 

Any one have history in trying such a heat recovery approach?

 

Brian

 

Thornton Energy Consulting

p. 503-231-6600 f. 503-231-3555

thorntonenergy at comcast.net

 

 
 
==================
You received this e-mail because you are subscribed 
to the BLDG-SIM at GARD.COM mailing list.  To unsubscribe 
from this mailing list send a blank message to 
BLDG-SIM-UNSUBSCRIBE at GARD.COM


======================================================
You received this e-mail because you are subscribed 
to the BLDG-SIM at GARD.COM mailing list.  To unsubscribe 
from this mailing list send a blank message to 
BLDG-SIM-UNSUBSCRIBE at GARD.COM
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20051005/3a7b12df/attachment.htm>