[PRCo] Re: PCC heating

[Boris Cefer]

6 kilowatts of total consumption only for motorman!

I have a technical standard for thermal calculations on streetcars.
Complicated enough to end in mad-house. You would have to give me lots of
data concerning materials used for car structure and their thermal
characteristics, dimensions of parts, thicknesses etc.

As for the insulation, the earlier Tatra cars contained lots of impregnate
paper (very thick corrugated cardboards) in rooof and below windows. In
addition, the asphalt paint also provided some amount of insulation. Of
course, there is no insulation in the window sills and posts and these
conduct the heat directly from inside to outside. Later they substituted a
special fiberglass for the paper. All cars were insulated. Possibly except
those for Kairo, Egypt.

As for windows, all windows are made of single sheet safety glass, thermally
treated (not two sheets cemented together). The newer equipment has front
windows cut of laminated safety glass for higher safety.

B

----- Original Message -----
From: "Fred Schneider" <fschnei at supernet.com>


> 6 or 6 kw heaters or total current consumption?  What would be a normal
> energy requirement to bring an uninsulated 45-foot car from 20 degrees
> to 50 degrees?
> Now lets take that a step farther ... were the Russian cars insulated?
> How about the Czech cars?  Were the windows glazed with two sheets of
> glass with an air space between?