From: Monona Rossol <0000030664c37427-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU>
Subject: Re: Fwd: [DCHAS-L] ASHRAE TC9.10 - Lab Classifications - LVDL guideline
Date: Mon, 23 Apr 2018 15:42:00 -0400
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Message-ID: 162f406f9e9-c8b-39c5**At_Symbol_Here**webjas-vab080.srv.aolmail.net
In-Reply-To
Demystify:
Aw shoot: Here's the biggest issue I have with the standard:
"2. Energy recovery
system
Various types of energy recovery systems can be used depending
on the hazards in the exhaust. The type can affect efficiency and
the potential for recirculation of exhaust. Options include
runaround loops (least efficient, but safest), heat pipes (more
efficient), and rotary heat exchangers (heat wheels) (most
efficient, potentially least safe)."
The ACGIH Manual of Recommended Practice does NOT recommend these heat wheels except for air that is essentially free of toxic contaminants. And one reason is that the two air streams, in-going and out-going, actually pass each other without a barrier between them at one point. To believe this works, you'd have to believe that contamination of a jacuzzi can be prevented by assigning a section for peeing.
These heat wheels return contaminated air. The argument about the system is only limited to how much air is returned. And that will vary with a number of factors. So in any laboratory where the ASHRAE Lab Standard also requires 100% exhaust this is not appropriate equipment.
I'm a member of both ASHRAE and ACGIH. Every building I've planned needs design elements from both types of engineering. ASHRAE should limit their standards to the systems in the name of their organization..
Thanks to everyone for their hard work on this considerable task. I feel it's an achievement that we should all be proud of. Now it=E2=80™s time to spread the news, so the industry starts using it!
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