[PRCo] Re: PCC heating

[Boris Cefer]

I have no idea. But I can agree with 15-25%.

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

> 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