Commercial Water Heating [RE-wrenches]

[Jeff Clearwater]

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Hi All,

Many years back (1982) we installed a heat recovery system in a 
laundromat that worked off the waste dryer heat.  It was a 
commercially available kit at the time.  I'd have to do some research 
on who made it.  I'd be curious if it's still in service.  (Anybody 
in Middlebury, VT want to go check up on it?).  My partner at the 
time now is in Burlington,  I may give him a call and see if he's 
heard if it's still kicking.

It worked on a boiler/tank system and I do remember the literature 
claiming very good payback and we were impressed with the quality of 
the kit and ease of installation.

Also a quick internet search shows the Re-Cycoil system for drain 
heat recovery for laundromats.

http://gfxtechnology.com/Coin-Op.pdf

Hope that helps!

Best,

Jeff





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>Hi y'All,
>    I did some analysis several year ago on waste water heat recovery 
>for a laundromat.
>The timing of the waste water cycle and fill cycles was not 
>coincident, and I came to the conclusion was that the efficiency of 
>the system would not support the investment.
>The drain heat exchanger might work better on a shower where the 
>supply and drain flows are coincident. This conclusion is supported 
>by Darryl's experience.
>    Hot water heating issues are likely to get more interesting as 
>the cost of Natural Gas rises. I have been getting papers on the 
>long term forecast for LNG, and basically worldwide demand is 
>outrunning supply.
>    The last solar thermal marketing opportunity in the 70's was 
>characterized by lots of really terrible designs and equipment 
>developed by inexperienced entrepueners and installed by 
>incompetents. A significant percentage of the buying public got 
>burned. It is up to the wrenches to get really agressive about 
>marketing good equipment installed to the highest standards to keep 
>the sharks and fools out of the center of the market.
>
>culater  deant
>
>Darryl Thayer wrote:
>
>>Hi all
>>I have used the standard waste heat recovery exchanger
>>in laundry mats.  This is a section of drain pipe with
>>a coil of copper around it.  The problem is the hot
>>water is drawn when filling the machines and dumped at
>>a later time, thus the discharge cycle is not in phase
>>wht the charging cycle. 
>>Another item is the Air to Air exchanger supplying
>>heat to the laundry space.  The problem is the fire
>>hazard of the lint buildup.  The units require
>>frequent cleaning.  I made and installed one several
>>years ago, still in use, but I would never take the
>>risk again.  I asked if I could remove it, but the
>>owner likes it to much.
>>
>>On Microturbines, again several years ago, 1995? very
>>long life, repair, rebuild does not enter picture. First Cost out 
>>of sight, and efficiency less than
>>recip engine, 15 to 17% as I remember, but check.
>>Daryl
>>
>
>--
>Dean T. Newberry
>Marketing and Sales
>
>Quantum Energy Group
>256 Applegate School Road
>Applegate, Ca. 95703
>
>Tel: 530 878-4585
>Fax: 530 878-6685
>Cel: 530 867-2392
>
>deant at dcn.org
>http://www.talbottsolar.com/
>http://mjdsolar.com/
>
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-- 
~~~~~~~~~~~~~
Jeff Clearwater
Village Power Design Associates
Sustainable Energy & Water Solutions for Home & Village
http://www.villagepower.com
gosolar at villagepower.com

530-470-9166
877-SOLARVillage
877-765-2784
425 Nimrod St.
Nevada City, CA 95959
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