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Subject: Re: [DCHAS-L] heating/cooling issues
Date: Wednesday, April 14, 2021 at 6:16:28 PM
Author: Dr Bob <drbob**At_Symbol_Here**FLOWSCIENCES.COM> 		Next by Date:
Subject: Re: [DCHAS-L] heating/cooling issues
Date: Wed, 14 Apr 2021 22:49:47 +0000
Author: "Stuart, Ralph"

From: 000006c59248530b-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU
Subject: Re: [DCHAS-L] heating/cooling issues
Date: Wed, 14 Apr 2021 12:29:13 -1000
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Message-ID: 5fb9abb1-b096-4933-9676-735b1487d566**At_Symbol_Here**email.android.com
In-Reply-To


In general labs have 6-12 air changes per hour. At that exhaust rate you need a lot of people and equipment to really affect the ambient room temperature. In 46 years I have only seen a few labs with so much heat producing equipment that it seriously affected the HVAC loads versus the enormous amount due to the hood exhaust. SEM/TEM's or similar large heat loads in small labs are the usual culprit. Large numbers of ovens (i.e. labs with banks on every wall or bench) for drying or similar operations are another.

A much more common source of high temperatures is an older lab which has had significantly more exhaust added than supply. In that much more common case, the problem is that you are exhausting all or at least most of you cool AC through the hoods, local exhausts, and ventilated enclosures. Usually even s fast search of the building documents shows proposals that warned more supply air was required or more AC capacity which was not approved due to higher costs.

Pay me now or pay me a lot more later as the saying goes.

On Apr 14, 2021 12:16 PM, Dr Bob <drbob@FLOWSCIENCES.COM> wrote:




Sent from my Samsung Galaxy , an AT&T LTE smartphone
Hi Yarttza!

It is possible to use an inclosed cabinet to house heat emitting electronics snd control heat distriburion while saving HVAC.


-------- Original message --------
From: Yaritza Brinker <YBrinker@FELE.COM>
Date: 4/14/21 5:17 PM (GMT-05:00)
To: DCHAS-L@Princeton.EDU
Subject: Re: [DCHAS-L] heating/cooling issues

The last lab remodel I oversaw, needed to include ventilation upgrades to meet the room temperature requirements of heat generating test equipment. The equipment manuals were my best tool in getting that done. Scientific principles would have been my worst tool to use.

Ê

OSHA standard is silent on indoor temp/humidity requirements. ThereÕs an OSHA letter that states temp/humidity is a matter of ÒcomfortÓ and although they do have recommendation, they wonÕt enforce it. However, OSHA standard does have inhalation limits. Since evaporation rates go up when RT goes up. You could argue that constant temperature and ventilation have a synergistic effect on reducing the inhalation exposure. You could go as far as presenting some hypothetical calculations using select chemicals in your stockroom.

Ê

OSHA does mention uncomfortable indoor temps when talking about ergonomics. See Appendix III:2-1 of OSHA Technical Manual (OTM) Section III: Chapter 2

https://www.osha.gov/otm/section-3-health-hazards/chapter-2

Ê

You might find the seemingly brush-off answer has a deeper root on something that isnÕt easily fixable. If you can get them to talk candidly, theyÕll probably tell you what information they need from you to justify changes and secure funds.

Ê

Thank you,

Ê

Yaritza Brinker

260.827.5402

Ê

From: ACS Division of Chemical Health and Safety <DCHAS-L@Princeton.EDU> On Behalf Of Rakers, Rosemary S.
Sent: Wednesday, April 14, 2021 12:46 PM
To: DCHAS-L@Princeton.EDU
Subject: [DCHAS-L] heating/cooling issues

Ê

** External Email **

Hello all,

Ê

I am looking for resources, personal experience, anything that will help me with talking to facilities about maintaining an appropriate temperature in a science building. Obviously temperature (and humidity) are a concern. We can all agree that climate change is a thing and that we are going to get fluctuations in temperature. IÕm having a difficult time convincing some people in facilities that having high temperatures in a science building is more than just an inconvenience. IÕm looking for documentation, anything that will help my cause in convincing them that when we reach high temps (we were at 89.6 F last week in my flammable storage room) something needs to be done.

Ê

IÕve been searching the DCHAS website but not finding what I am looking for. IÕve looked at SDSÕs until I am blue in the face, but they tend to say Òkeep in a cool, well-ventilated locationÓ. What does ÒcoolÓ mean? Facilities tells me I should move all my chemicals to a refrigerator when it gets hot. Obviously that is not feasible.

Ê

Any insight you can provide is a appreciated.

Thank you.

Rose

Ê

Ê

Ê

Rose Rakers, Ph.D.

Director of Chemical Laboratories & Chemical Hygiene Officer

Benedictine University

5700 College Rd

Lisle, IL 60532

630-829-6571

Ê

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