generator cooling (Re: Re[2]: telehouse - 25 broadway)

["E.B. Dreger" <eddy+public+spam () noc everquick net>]

> Date: Sun, 16 Sep 2001 11:45:26 -0400 (Eastern Daylight Time)
> From: Alex Rubenstein <alex () nac net>
>
> From what I've heard from 32 Old Slip, the reason for thier
> generators to fail was that the intake filters were clogged from
> the concrete dust in the air.

Hmmmm.... although this situation is far from one's typical
power outage, maybe one should not rely on the radiator.
Ass-u-ming that one has a steady supply of water:

        s/radiator-cooled water/external water supply/

It works the same.  The only purpose of the radiator is to
facilitate cooling _without_ an external water supply, to reuse
the existing water.

Yes, a contastly-flowing external water supply is wasteful.  So
we make it "emergency only".  Note that the numbers represent
thermostat temperatures in degrees Fahrenheit[1], and the arrows
signify flow direction (check valves and water pump omitted for
simplicity):

                       ~~~~~~
                       supply

                       ~~~~~~
                          |
                          V
                          +------<------+
                          |             |
                          V             |
                     +--------+         |
                     | engine |         ^
                     +--------+         |
                          |             |
                          V             |
                       +-----+          |
                       | 165 |          ^
                       +-----+          |
                          |             |
                          V             |
                    +----------+        |
                    | radiator |        ^
                    +----------+        |
                          |             |
                          V             |        +-----+
                          +------>------+--->----| 195 |
                                                 +-----+
                                                    |
                                                    V

                                                  ~~~~~
                                                  drain

                                                  ~~~~~

[1] Apologies to the standards-abiding, metric-loving people out
    there.  I just don't feel like converting right now. :-)

Save for the high-temp thermostat and the external water supply,
it looks remarkably like a standard system with overflow.  The
big disadvantage to this design is that, if one runs out of
water, this _will_ overheat.  But overheating is imminent when
the high-temp thermostat opens (a prerequisite for running out
of water), so we were SOL anyway.

> -- Alex Rubenstein, AR97, K2AHR, alex () nac net, latency, Al Reuben --
> --    Net Access Corporation, 800-NET-ME-36, http://www.nac.net   --


Eddy

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