Definition, pumps/compressors, was ?A/C questions ...

[RandalPark@xxxxxxx]

That's not picky, it is very informative. A pump is a pump and a compressor is 
a compressor. Now I have a question, what is a fradient?

Paul

In a message dated 8/31/2004 8:41:08 PM Eastern Daylight Time, 
dardal@xxxxxxxxxxxxxxx writes:

>No argument on the useful info here.  I don't want to be too picky, but in 
>mech.
>engineering terminology, a compressor is a device that "motivates" flow of a
>compressible fluid (gas), whereas a pump operates an incompressible fluid. 
>When R134 or R12 enters the AC compressor (not pump), its a compressible gas,
>and when it exits, its still a gas, just a bunch hotter and compressed ... gas.
> The water pump is a "pump" because liquid water comes in, and liquid water
>comes out, at the same density.  Same with the power steering pump.  Even
>though the pressure can go up by 500 or more psi, the density does not change,
>or the increase is minute.  Compressors usually require a lot more power than
>pumps, because the working fluid "shrinks" as it gets compressed, and also
>create more heat.  The incmompressible fluid in a pump behaves itself better,
>and as a result, pumps can achieve very large pressure fradients with not too
>much power, and generating not as much heat.
>
>D^2
>
>Quoting Kenyon Wills <imperialist1960@xxxxxxxxx>:
>
>> You are a brave man, or one desperately seeking air conditioning.  I have
>> avoided the AutoTemp II unit on my car, so can't answer all of those
>> questions, but regarding the AC pump:
>
>
>
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