[Bldg-sim] Sewer heat recovery

[Graham Carter & Megan Lyall]

Our company looked at this years ago (before I joined them) as an alternative to cooling towers.  As I understand we had to ditch it as the water authority was changing their infrastructure and moving sewer pumping stations which was the nail in the coffin.  However that aside the variability of flows and the fact that they are not guaranteed was a big barrier.  We would still have had to have a backup heat rejection source...  There has also been a huge move towards water efficiency in Australia (driest continent next to Antarctica) in the past 15+ years and recycled water plants are more common in precinct and larger buildings.  So liquor flows are on the decline with all else equal.  Just became more work and uncertainty than it was worth...  Your situation may be different …

Regards,
Graham

On 01/06/2013, at 4:42 AM, Nick Caton wrote:

> Hi Vikram,
>  
> My gut reaction would be to determine (or preferably get others to determine) what an annual temperature profile would look like for the… effluent.  Get the same person to inform you of whatever special considerations should be given to pumping energies and heat exchanging elements.
>  
> Transpose that information onto a lake/well heat exchanger, and go to town!
>  
> Worth noting however, I have had mixed hurdles in the past when working with water-to-water heat exchangers.  Some projects were smooth/easy and others were tougher to set up properly – it would probably be advisable to play with setting your hydronic systems up early (with default inputs as needed) just to be sure you will have a working game plan once all the information you plan to receive is available.  This exercise may help uncover some other information you need to seek out along the way.
>  
> Regards,
>  
> ~Nick
>  
> <image001.jpg>
>  
> NICK CATON, P.E.
> SENIOR ENGINEER
>  
> Smith & Boucher Engineers
> 25501 west valley parkway, suite 200
> olathe, ks 66061
> direct 913.344.0036
> fax 913.345.0617
> www.smithboucher.com
>  
> From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Sami, Vikram
> Sent: Friday, May 31, 2013 11:41 AM
> To: bldg-sim at lists.onebuilding.org
> Subject: [Bldg-sim] Sewer heat recovery
>  
> We are looking at sewer heat recovery for a large project in the northwest. I have a couple of questions:
>  
> 1.       Has anyone used this on a project successfully
> 
> 2.       How do you model it? My initial though is to model it as a lake/well ground loop heat exchanger, but there’s probably a good reason not to do it that way.
> 
> Thanks in advance
>  
> Vikram Sami
> Associate Partner
>  
> ZGF ARCHITECTS LLP
> T 206.521.3509 E vikram.sami at zgf.com
> 925 Fourth Avenue, Suite 2400 
> Seattle, WA 98104
>  
>  
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