[Greenbuilding] Drain Waste Heat Recovery

[John Straube]

Come off of it Carmine, you are simply selling your products and still upset at the world that your brilliance has not resulted in fame and fortune.
I have actually seen the Renewability factory, and their is nothing trade secret about it that I can see. Pretty easy to role a squared copper tube onto a DWV copper pipe in a thermally conductive manner. In fact, one of best friends actually made his own and has measured pretty good efficiency. It is simply easier to buy a product.
Also, low pressure drop coils are more not necessarily poor heat transfer. There are factors of thermal transfer, mass flow rates, roughness inside, area of contact etc.


Carmine Vasile wrote:
> Richard: Tom St Louis is again misleading the Greenbuilding Forum. A 
> Power-Pipe is a brand of Gravity Film Heat Exchanger ("GFX") made with a 
> trade secret manufacturing process stolen from yours truly by Gerald and 
> Denis VanDecker; officers of Renewability Energy Inc.
> 
> There are reputable Canadian GFX manufactureres that developed their own 
> GFX-technology such as Watercycles (http://www.watercycles.ca/) & ReTherm 
> (http://www.retherm.com/). They are also made with one or more copper coils 
> wrapped around copper tubes. I recently authorized Watercycles to become an 
> ETL-Listee so that their GFX's will be able to carry the ELT 
> safety-certification Mark. 
> (http://www.intertek-etlsemko.com/portal/page/cust_portal/ITK_PGR/)
> 
> In fact, comparable GFX's made by two US companies (Smart Drain &  FCCI) and 
> two Canadian companies (ReTherm & Renewability) were tested by Natural 
> Resources Canada (NRCAN). According their Report, both Power-Pipe models 
> exhibited lower effectiveness for equal & unequal coil & drain-flow rates.
> 
> There are two basic reasons for this: (1) Any GFX designed for a low coil 
> pressure drop will have a lower heat transfer coefficient ("U"); (2) An 
> analysis of NRCAN's test results indicate Power-Pipes also have less heat 
> transfer area. Therefore, much longer and more expensive Power-Pipes are 
> required to save the same amount of energy as the US-made GFX's tested by 
> NRCAN.
> 
> If any Greenbuilder is interested in receiving a copy of this NRCAN Report, 
> please let me know.
> Carmine
> 
> 
> 
>> From: "Richard Garbary" <richard6 at gmail.com>
>> To: Greenbuilding at listserv.repp.org
>> Subject: Re: [Greenbuilding] Drain Waste Heat Recovery
>> Date: Fri, 29 Jun 2007 10:25:00 -0400
>>
>> Where does it say the Power-Pipe is the "only Canadian Energy Star Program
>> compliant Drain Heat Recovery unit..."
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> 
> 
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> 

-- 
Dr John Straube, P.Eng.
Associate Professor
Dept of Civil Engineering & School of Architecture
University of Waterloo
Waterloo, ON Canada