Date: Tue, 18 Mar 2008 12:19:28 +0800
Reply-To: Allan Kamen <allan.kamen**At_Symbol_Here**ALLAFION.COM>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: Allan Kamen <allan.kamen**At_Symbol_Here**ALLAFION.COM>
Organization: AF Air Control Limited
Subject: Laboratory Ventilation

Although a heat wheel may be a useful item from a sustainability 
standpoint for office air, I can think that for a lab this may be a problem.

I think you can consider the molecular sieve heat recovery wheels for 
the lab general exhaust but I have reservations about using a heat wheel 
for any type of fume hood exhaust. 

The general exhaust air can be recycled, the fume hood exhaust air 
should not be recycled. 

No matter how large the purge zone on the heat wheel, there will be some 
amount of material returning from the exhaust air stream.  In addition 
the chemicals in the fume hood exhaust air stream will attach the heat 
wheel and damage the wheel.  What guaranty can you get from the 
manufacturer against corrosion and fouling in an exhaust stream?

Allan Kamen
AF Air Control Limited
China Economic Trade Building
24th Floor, Suites I-K
7 Zizhu Road
ZhuZiLin, FuTian District,
Shenzhen, China    518040 

tel: +86 755 2694 2015
fax: +86 755 2694 2317
mob: +86 135 1034 0687

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