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Re: Electric Water Pumps, and radiators

To: NamasteRH@aol.com
Subject: Re: Electric Water Pumps, and radiators
From: Roland Dudley <cobra@cdc.hp.com>
Date: Mon, 17 Jun 96 12:13:50 PDT
> In a message dated 96-06-15 20:14:17 EDT, Steve Laifman writes:
> 
> >> I suggest that a variable resistor (rheostat) in series with the motor 

>  the voltage and turning it to HEAT.  There are electronic means of 
>  doing this, but simply turning it off when it isn't required is a 
>  simpler solution.  All modern cars (post 1968) have had such devices, 
>  Your local Rocket Scientist,
>  
>  Steve Laifman
> 
> Steve:
> 
> You are missing the point, I think.  The problem here is that the flow rate
> of the water pump is too high and the coolant has insufficient time in the
> radiator for heat transference.  The introduction of a rheostat was suggested
> as a means to slow the pump, allowing (assuming a simple circuit) the water
> to remain in contact with the radiator for a longer period.
> 
> Rick
> 
>

A few months back there was an extended discussion on the british-cars
list about whether or not is was possible for coolant flow to be too
high to allow sufficient time for it to be cooled in the radiator.  If I
recall, there where all kinds of thermodynamic arguments both ways, with
the final consensus (I think) being that it wasn't possible.

BTW, I'm not taking side on this 'cuz I don't know- I'm an EE, not an
ME, and my thermodynamics course was a looong time ago.  

Roland 

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