It is indeed "convection"...you'll have to forgive John...he is OLD AND DECREPIT....and needs to have his transgressions overlooked.
Pete
-----Original Message-----
From: Lawrence Brigham larry5925@embarqmail.com [CBQ] <CBQ@yahoogroups.com>
To: George Crawford georgecrawfordsr@comcast.net [CBQ] <CBQ@yahoogroups.com>
Sent: Fri, Feb 12, 2016 7:56 am
Subject: Re: [CBQ] NW1/NW2 question
As one who used to teach thermodynamics (circa 1973), Pete, I can say you got it exactly right! It cooled the compressed air by radiation, conduction and convention and that's called "heat transfer"!
From: "Jpslhedgpeth@aol.com [CBQ]" <CBQ@yahoogroups.com>
To: CBQ@yahoogroups.com
Sent: Wednesday, February 10, 2016 11:00 AM
Subject: Re: [CBQ] NW1/NW2 question
I believe that that "radiator like object"...is exactly what you have named it. IIRC my long ago engineering school courses that thing is called an "after cooler"..When air is compressed its temperature increases..Remember P1 T1 VI =P2T2V2. The compressed and heated air is passed through the "after cooler" before it's admitted to the main reservoir. It's especially to get the condensation out of the compressed air to prevent "freeze ups" in the winter time and excess moisture, hence damage in the summer.
Those with more recent Thermodynamics training and explanatory expertise may want to "weigh in" and/or "shoot down" my idea.
Pete
-----Original Message-----
From: 'Micheal Farley' mfarley@midco.net [CBQ] <CBQ@yahoogroups.com>
To: cbq <cbq@yahoogroups.com>
Sent: Wed, Feb 10, 2016 8:04 am
Subject: [CBQ] NW1/NW2 question
Everyone,
On the NW1’s and early model NW2’s without door louvers, there is a radiator-like object between the frame and the air tanks on both sides of the locomotive. What exactly is this item? Is there a suitable detail part in HO scale for this item?
This photo shows the item about as good as any other: http://www.rrpicturearchives.net/showPicture.aspx?id=4280766
Also, is the three-pane all-weather window currently available in HO scale? I have two of the Overland’s from 20-30 years ago but need more…
Micheal Farley
Bis marck, ND
www.facebook.com/yellowstonedivision <http://www.facebook.com/yellowstonedivision>
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Posted by: jpslhedgpeth@aol.com
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