Hi Justin
Another upvote for water cooled and anther vote for use of a Haskris like
chiller to provide an isolated cold loop to your cold heads.
We have 5 of these that run cold probes and cold heads for QD helium recovery
system.
Our building chilled water is like the bottom of the Mississippi and any power
bump in the building water stirs it up and clogs things.
For this reason we use a WW1 or WW2 system from Haskris. These are designed
for dirty building water.
We have found that we can back flush the building water filters in about 2
minutes and this barely registers on the temperature change in the Haskris.
Every now and then when the probe/liquefier is offline we back flush the heat
exchangers of the Haskris.
Haskris will help you spec the system based on the pressure differential between
your building water supply and return, building water temp and building water
flow rate achievable at your use point. And your target temperature for
HAskris operation - for a Sumittmo F50 and F70 we found 72 degrees works fine.
If you have multiple compressors you can spec the Haskris to handle multiple circuits.
And second the comment from Alex on tuning flow rates and temperatures from
the HAskris to the compressors.
There is a lot of flexibility and faster is not always better.
- David Jones
----------------------------------------------
Associate Professor,
Dept. of Pharmacology,
University of Colorado School of Medicine
Tel. (303) 724-3600
Email david.jones_at_cuanschutz.edu
http://pharmacology.ucdenver.edu/faculty/jones
> On Feb 29, 2024, at 9:58 AM, Alex Paterson via groups.io wrote:
>
> Hi Justin,
>
> We run about 13 water-cooled helium compressors (mostly Sumitomo F-50 and
> F-70 units) and would not in any circumstances change to air. The technical
> manuals for the compressors have good information for allowable chilled water
> temperature and flow rates, and they’re fairly flexible for those
> parameters.
> I third the caution about water quality, though. We have a closed process
> chilled water loop that rejects the heat to campus chilled water, which avoids
> most water quality issues. If campus chilled water doesn’t meet the
> quality spec, you might want to look into that as an option.
>
> Best,
> Alex
>
> Alexander Paterson, PhD
> Scientist II | Department of Biochemistry
> The National Magnetic Resonance Facility at Madison (NMRFAM)
> University of Wisconsin-Madison
> 433 Babcock Dr, Room B160C | Madison, WI 53706
> TEL: (608) 263-0017
>
>
> From: main_at_ammrl.groups.io On Behalf Of Parnham, Stu
> Sent: Thursday, February 29, 2024 10:46
> To: main_at_ammrl.groups.io
> Subject: Re: [AMMRL] Water or Air cooled Cryoplatform?
>
> Hi Justin,
>
> I currently have water cooled but in the past I’ve had indoor and
> outdoor air cooled. I love the water cooled and have had none of the issues
> I had with the air cooled, no cleaning of the fins every 3 months. The
> only thing I would say is to make sure that your chilled water temperatures
> do not fluctuate too much and that there is no particulates floating in the
> system. The facility guys usually have good numbers to hand for the chilled
> water and you can always run them past Walter Osgood at Bruker for approval.
>
> Stu
>
> -------------------
> Stuart Parnham Ph.D.
> Biomolecular NMR
> Marsico Hall, SB205A
> University of North Carolina
> Phone:(919)-966-6184
> From: main_at_ammrl.groups.io On Behalf Of Justin Pontius via groups.io
> Sent: Thursday, February 29, 2024 11:04 AM
> To: main_at_ammrl.groups.io <mailto:main_at_ammrl.groups.io>
> Subject: [AMMRL] Water or Air cooled Cryoplatform?
>
>
> Hi Everyone,
>
> We're in the planning stages of upgrading our aging AV1-800 to something
> more modern. Currently we have a 1st gen cryoplatform with an air cooled
> compressor outside on a balcony. Maintenance is a small pain with all the
> tree leaves, cotton, and dirt. If you had the choice would you go with
> another air cooled compressor or water cooled? We don't have chilled water
> in the lab yet but it's about 50 feet away in a service closet so it wouldn't
> be too bad to bring it in. Thoughts?
>
> --Justin
>
> Justin Pontius
> NMR Facility Engineer
> Magnetic Resonance Research Center
> University of Notre Dame
> nmr.nd.edu
> 574-631-7601 (direct line)
>
> 145A Nieuwland Science Hall
> Notre Dame, IN 46556
>
>
>
-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#1040): https://ammrl.groups.io/g/main/message/1040
Mute This Topic: https://groups.io/mt/104646404/7559972
Group Owner: main+owner_at_ammrl.groups.io
-=-=-=-=-=-=-=-=-=-=-=-
Received on Fri Mar 01 2024 - 09:46:10 MST