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<DIV><SPAN class=984193814-08122005><FONT face=Arial color=#0000ff size=2>My
concern is that is over simplifying the process. It is the build up on the
interior pipe walls that is the concern. I estimate that the drain
pipe temperature will be 15-25 deg C. If grease builds up anywhere along
this run, you increase the probability of a drain backup over time.
Draining warm/hot water minimizes the buildup of grease/dirt. Removing
heat from exiting water will increase likelyhood of buildup on the draining
pipe.</FONT></SPAN></DIV>
<DIV><SPAN class=984193814-08122005><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=984193814-08122005><FONT face=Arial color=#0000ff
size=2>Ultimately you need to consider, pipe length, pipe temperature and water
temperature along with how much heat that is being removed.</FONT></SPAN></DIV>
<DIV><SPAN class=984193814-08122005><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=984193814-08122005><FONT face=Arial color=#0000ff size=2>I hope
my comments are not being seen as negative, but more trying to avoid a very
messy situation down the road.</FONT></SPAN></DIV>
<DIV><SPAN class=984193814-08122005><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=984193814-08122005><FONT face=Arial color=#0000ff
size=2>Cheers</FONT></SPAN></DIV>
<DIV><SPAN class=984193814-08122005><FONT face=Arial color=#0000ff
size=2>Suneel</FONT></SPAN></DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid">
<DIV class=OutlookMessageHeader><FONT face="Times New Roman"
size=2>-----Original Message-----<BR><B>From:</B> Debra Lombard
[mailto:dlombard@retec.com]<BR><B>Sent:</B> December 8, 2005 9:18
AM<BR><B>To:</B> suneel.gupta@energyadvantage.com<BR><B>Cc:</B>
bldg-sim@gard.com<BR><B>Subject:</B> Re: [bldg-sim] kitchen exhaust heat
recovery<BR><BR></FONT></DIV><BR><FONT face=sans-serif size=2>We'll that could
be determined. Find out at what temperature grease in water will solidify then
find what temperature differential there would be between the draining hot
water before and after the heat exchanger.</FONT> <BR><BR><FONT
face=sans-serif size=2>I'm sure Carmine would know.</FONT> <BR><BR><FONT
face=sans-serif size=2>Debra Lombard, LEED AP<BR>Sustainable Design
Specialist<BR>The RETEC Group, Inc.<BR>900 Chapel St., 2nd Fl - Box 9<BR>New
Haven, CT 06510<BR>Tel: 203-868-0137<BR>Fax:
203-773-3657<BR>dlombard@retec.com<BR></BLOCKQUOTE></FONT><PRE>
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