[PRCo] Re: PCC heating

[Fred Schneider]

OK, I'll rephrase the question.  What are the minimum and maximum energy
requirements from 20 degrees for 50 degrees Fahrenheit between a non insulated
and a fully insulated car of about 45-foot length?  Give or take 25%.  As we
would say, ballpark figures.  And what might it have added to a system's total
traction power needs?

Boris Cefer wrote:

> 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?