All- Water solutions of both sodium chloride and calcium chloride were used in
refrigeration systems starting, I believe, in the early 1900 years. The brine
was cooled by a refrigerant, often anhydrous ammonia. Because of the toxic
nature of ammonia, it was not used directly as freon systems are today.
The compressor and expansion/cooling of the brine would have been under the
cars and a pump would circulate the brine to cooling coils in the airstream
that cooled the car. As Gerald said, the tank would hold a supply for when the
car was not moving. Some food processing and meat packing plants still use this
type of refrigeration. Anhydrous ammonia is the most efficient of the
different refrigerants. Freons were developed because of its toxicity.
Bob Sorensen
----- Original Message -----
From: Gerald Edgar <vje68@hotmail.com>
To: cbq@yahoogroups.com
Sent: Sat, 02 Apr 2011 17:03:38 -0400 (EDT)
Subject: RE: [CBQ] Re: Brine Tank Question
Brine (salt water) will freeze at a lower temp than plain water thus the 'cold'
water is colder than 32F and when either piped or exposed to a fan, it's colder
than normal water would be in liquid state. Ice in a brine tank also melts
more slowly. (today we use chemicals to lower freezing points such as glycol
for radiators)Brine tanks common in ice reefers - one Q hwt passenger car still
was using ice for A/C @ BN time; this was covered in an original CB&Q H.S.
publication. Am on the road so cannot reference at this time.
Gerald
To: CBQ@yahoogroups.com
From: ku0a@mchsi.com
Date: Sat, 2 Apr 2011 14:37:50 -0500
Subject: RE: [CBQ] Re: Brine Tank Question
Jerry et al.,
As I understand the function of the brine tanks, they were by the A/C system
during station stops in hot climates (like Arizona) when the cars were
stopped, hence the mechanical drive couldn't be used. Exactly how the brine
solution provided cooling remains obscure to me. Maybe one of our A/C
professionals could enlighten us all.
Nelson
-----Original Message-----
From: CBQ@yahoogroups.com [mailto:CBQ@yahoogroups.com] On Behalf Of
sartherdj@aol.com
Sent: Saturday, April 02, 2011 1:53 PM
To: CBQ@yahoogroups.com
Subject: Re: [CBQ] Re: Brine Tank Question
Jerry,
Thanks for the more detailed analysis of the information found in the
Pullman Car Project spreadsheet. It's amazing all the detail present on
those
sheets when one learns how to use the key to the abbreviations. So, yes
indeed both cars that Nelson is interested in, "New Omaha" and "New
Capitol",
both had Pullman Mechanical AC systems that did not have brine tanks. Now
all I need to learn is the function of a brine tank in an AC system.
Later, Dave S. Tucson, AZ
[Non-text portions of this message have been removed]
------------------------------------
Yahoo! Groups Links
[Non-text portions of this message have been removed]
------------------------------------
Yahoo! Groups Links
------------------------------------
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/CBQ/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/CBQ/join
(Yahoo! ID required)
<*> To change settings via email:
CBQ-digest@yahoogroups.com
CBQ-fullfeatured@yahoogroups.com
<*> To unsubscribe from this group, send an email to:
CBQ-unsubscribe@yahoogroups.com
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
|