Date: Wed, 22 Jun 2011 07:44:19 -0400
Reply-To: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
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From: Kim Auletta <kauletta**At_Symbol_Here**NOTES.CC.SUNYSB.EDU>
Subject: Re: Heat Recovery Wheel help needed
In-Reply-To: <2042c.67e3a3e.3b32b45a**At_Symbol_Here**cs.com>


I'm not sure if this is the rule she was referring to, but on my other 
list, someone posted a copy of the ASHRAE 62-2004 letter of interpretation 
for acceptable cross leakage for energy recovery ventilation:

"Summary: ASHRAE 62-2004 provides clear guidance and clarification to air 
stream recirculation issues and defines air classification categories. 
With respect to recovering energy from exhaust air, the amount of 
acceptable exhaust air cross leakage is now quantified based on the 
contaminant concentrations of the exhaust air."

It does not specifically prohibit this technology for labs, but does say:

"Class 4: Air with highly objectionable fumes or gases or potentially 
containing dangerous particles, bioaerosols, or gases at a concentration 
high enough to be considered harmful, not suitable for recirculation or 
transfer to any other space. 
Examples: paint spray booths, laboratory fume exhaust, kitchen grease 
exhaust."

Kim Auletta
Lab Safety Specialist
EH&S    Z=6200
Stony Brook University
kauletta**At_Symbol_Here**notes.cc.sunysb.edu
631-632-3032
FAX: 631-632-9683
EH&S Web site: http://www.stonybrook.edu/ehs/lab/

Remember to wash your hands!


From:   ACTSNYC**At_Symbol_Here**CS.COM
To:     DCHAS-L**At_Symbol_Here**LIST.UVM.EDU
Date:   06/22/2011 07:36 AM
Subject:        Re: [DCHAS-L] Heat Recovery Wheel help needed
Sent by:        DCHAS-L Discussion List 



Hmmmm.  The 2007 (26th Edition) of the ACGIH manual said to "avoid" heat 
wheels.  And the 2010 (27th Edition) included the even stronger 
prohibition I quoted in a previous post.  So if there is some rule 
promulgated in 2011, I'd love to know about it.  I find it hard to talk 
LEED-besotted architects out of the wheels and would love to have another 
reference.

Monona 

In a message dated 6/21/2011 9:30:23 PM Eastern Daylight Time, 
baum.janet**At_Symbol_Here**GMAIL.COM writes: 

There is a new (January, 2011) restriction against using heat wheels to 
recover heat from exhaust generated by chemical hoods. I don't have the 
reference handy but will send it to you tomorrow.

Janet Baum


I'm not sure if this is the rule she was referring to, but on my other list, someone posted a copy of the ASHRAE 62-2004 letter of interpretation for acceptable cross leakage for energy recovery ventilation:

"Summary: ASHRAE 62-2004 provides clear guidance and clarification to air stream recirculation issues and defines air classification categories. With respect to recovering energy from exhaust air, the amount of acceptable exhaust air cross leakage is now quantified based on the contaminant concentrations of the exhaust air."

It does not specifically prohibit this technology for labs, but does say:

"Class 4: Air with highly objectionable fumes or gases or potentially containing dangerous particles, bioaerosols, or gases at a concentration high enough to be considered harmful, not suitable for recirculation or transfer to any other space.
Examples: paint spray booths, laboratory fume exhaust, kitchen grease exhaust."

Kim Auletta
Lab Safety Specialist
EH&S    Z=6200
Stony Brook University
kauletta**At_Symbol_Here**notes.cc.sunysb.edu
631-632-3032
FAX: 631-632-9683
EH&S Web site:
http://www.stonybrook.edu/ehs/lab/

Remember to wash your hands!

From:        ACTSNYC**At_Symbol_Here**CS.COM
To:        DCHAS-L**At_Symbol_Here**LIST.UVM.EDU
Date:        06/22/2011 07:36 AM
Subject:        Re: [DCHAS-L] Heat Recovery Wheel help needed
Sent by:        DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>




Hmmmm.  The 2007 (26th Edition) of the ACGIH manual said to "avoid" heat wheels.  And the 2010 (27th Edition) included the even stronger prohibition I quoted in a previous post.  So if there is some rule promulgated in 2011, I'd love to know about it.  I find it hard to talk LEED-besotted architects out of the wheels and would love to have another reference.

Monona


In a message dated 6/21/2011 9:30:23 PM Eastern Daylight Time, baum.janet**At_Symbol_Here**GMAIL.COM writes:

There is a new (January, 2011) restriction against using heat wheels to recover heat from exhaust generated by chemical hoods. I don't have the reference handy but will send it to you tomorrow.

Janet Baum

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