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June 2017

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Subject:
From:
Anette von der Handt <[log in to unmask]>
Reply To:
JEOL-Focused Probe Users List <[log in to unmask]>
Date:
Wed, 7 Jun 2017 19:21:33 -0500
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Wayne,

thank you very much and also to your maintenance guru! That is very 
valuable information and what I feared (variable volume is better and 
updating is expensive). I was not aware of the problems with multiple 
rooms and heat producer for variable air volume but in this case it is 
just one lab and one machine.

Now I just need to see what still can be done. We are building an entire 
new building and I am just one of many labs in it but the architects 
have been infuriating in their willful incompetence even within this 
framework.

Thank you very much again.

Regards,

Anette



On 6/7/17 3:35 PM, Wayne D. Niemeyer wrote:
>
> Anette,
>
> Our maintenance guru provided these comments based on experience with 
> both type of systems at our facility.
>
> The variable volume system can have better temperature control room to 
> room provided that a control box is dedicated to each room. However, 
> if you have a given variable volume control box feeding two rooms, 
> where one room has a heat-producing device, and the other does not, 
> you will struggle with one room being too hot or too cold. This 
> struggle to balance temperatures in multiple rooms is worsened in some 
> rooms because there are more rooms on a given “control box” (ie: 
> rooftop HVAC unit). And if the heat-producing load itself is variable, 
> there are bound to be problems. I would say we do a fair job on 
> temperature control in the labs. I think a variable volume scheme 
> would be better. The time to implement variable is at initial 
> construction time. Retrofitting can be very expensive, I think.
>
> Regards,
>
> *Wayne*
>
> *Wayne D. Niemeyer*|*Senior Research Scientist*
>
> Title: McCrone Associates, Inc. - Description: McCrone Associates, Inc.
> McCrone Associates, Inc. •**850 Pasquinelli Drive**•**Westmont, IL 60559**
>
> P. 630.887.7100 ext.2420 |F. 630.887.7417|www.mccrone.com 
> <http://www.mccrone.com/>
>
> ISO/IEC 17025:2005 A2LA Accredited, Certificate #3631.01 
> <http://www.mccroneassociates.com/sites/default/files/A2LA_Cert_3631-01.pdf>**• 
> FDA/GDUFA/DEA Registered 
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>
> This email and any files attached may contain information that is 
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>
> *From:*JEOL-Focused Probe Users List [mailto:[log in to unmask]] 
> *On Behalf Of *Anette von der Handt
> *Sent:* Wednesday, June 07, 2017 12:00 PM
> *To:* [log in to unmask]
> *Subject:* [PROBEUSERS] EPMA Labs HVAC: Constant air volume vs 
> variable air volume
>
> Dear probeusers,
>
> I am looking for people who could share their experience with constant 
> air volume HVAC systems and temperature stability in their lab and see 
> if anyone upgraded their constant air volume system to a variable air 
> volume system.*
>
> Any information is welcome. Thanks!
>
> Best,
>
> Anette
>
> * I want variable air volume and it turns out I am getting constant 
> air volume. I hate our architects with the fire of a thousand suns.
>
> -- 
>
> Dr. Anette von der Handt
>
> Department of Earth Sciences
> University of Minnesota
> 310 Pillsbury Drive SE
> Minneapolis, MN 55455
>
> Office phone: (612) 624-7370
> Office fax: (612) 625-3819
> Lab phone: (612) 624-3539
>
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> <mailto:[log in to unmask]>, Electron Microprobe Lab, University of 
> Minnesota
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> *
>
> **** JEOL Probe Users Listserver
>
> Moderator: Anette von der Handt, [log in to unmask] 
> <mailto:[log in to unmask]>, Electron Microprobe Lab, University of 
> Minnesota
>
> Post a message: send your message to [log in to unmask] 
> <mailto:[log in to unmask]>
>
> Unsubscribe: send "SIGNOFF PROBEUSERS" to [log in to unmask] 
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>
> *
>

-- 
Dr. Anette von der Handt

Department of Earth Sciences
University of Minnesota
310 Pillsbury Drive SE
Minneapolis, MN 55455

Office phone: (612) 624-7370
Office fax: (612) 625-3819
Lab phone: (612) 624-3539


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