[3dem] [EXT] microscope installation

[Sylvain Trepout]

Hi there,

I am not sure I understand which cooling loop you are talking about.
Because at the end of the day, the final loop will (almost) always be an
air-cooled loop. Example, if your local loop is cooled down by the building
chilled water, then the chiller of the building is most probably cooled
down by air. There are only a few systems which do not use air to cool down
the last loop, such as the computing cluster in Frankfurt, Germany which is
eventually cooled down by the river (if I remember correctly).

I would rather look at the cooling power each system can deliver. The air
cooling system has the great advantage of being fully independent. If there
is an issue with the chilled water of the building, you can still operate
your microscope. During my PhD we had a system where the Neslab could be
either air or water-cooled. This might also be an interesting solution to
look at.

Cheers,
Sylvain

PhD
Research Fellow - Microscopy Australia

Monash University

Ramaciotti Centre for Cryo-EM
G92, 15 Innovation Walk, Clayton Campus
Victoria, 3800 Australia

On Fri, 30 June 2023, 5:06 pm Johanna Höög, <johanna.hoog at gu.se> wrote:

> Same here! We had an air cooled chiller that we had to replace with a
> water cooled one because it could not chill enough (in Sweden). For us, the
> room where the chiller was placed was too small and the air-con system
> could not remove the heat fast enough so the whole room heated up. We then
> had to replace many water cooled chillers because our cooling water was not
> clean enough and clogged up the system, but that is another story..
>
> Best wishes,
>
> Johanna
>
> On 29 Jun 2023, at 17:05, Reinhard Rachel <
> Reinhard.Rachel at biologie.uni-regensburg.de> wrote:
>
> Water-cooled chiller.
> I would never choose / use an air-cooled chiller, again. (Ok, I am out
> anyway, due to retirement…).
> We even had been going through the phase of changing an air-cooled version
> into a water-cooled system - upgrading it. We had hot summer days , no,
> even weeks (in cold Germany), where the capacity of the air-cooled system
> was insufficient. Resulting in the shut-down of chiller plus TEM (120 kV!),
> for two weeks.
> Kind regards
> Reinhard
>
> Von meinem iPhone gesendet
>
> Am 29.06.2023 um 16:43 schrieb Morgan, David Gene <dagmorga at indiana.edu>:
>
> 
> Hi,
>
> We are installing a new high-end instrument here and the issue of whether
> to use an air- or water-cooled chiller has arisen.  I've always been in
> favor of water-cooled chillers and at least some of the places where I have
> worked did not have the capacity to remove the excess heat that an
> air-cooled chiller would generate.  For this install, we appear to have a
> choice.
>
> Is there a general consensus about which is better?
>
> --
>     politics is more difficult than physics.
>                                              A. Einstein
>
>             David Gene Morgan
>         Electron Microscopy Center
>              047E Simon Hall
>              IU Bloomington
>           812 856 1457 (office)
>           812 856 3221 (3200)
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