Re: thermostats

[Dave1massey@cs.com]

In a message dated 10/22/2005 10:47:19 PM Central Standard Time, 
hoyt@cavtel.net writes: 
> But too big a pump (too large a GPM rating) doesn't leave the water and air 
> in 
> contact with each other long enough and reduces efficiency. Time is also an 
> important consideration because all heat transfer takes place over time. To 
> much flow from the water pump can also lead to trouble if the rest of the 
> system cannot accommodate it. 
> 
I think you are confusing heat quality and heat quantity.  Moving the water 
through the radiator more slowly will result in a higher temperature change in 
the water passing through but since there is less water moving through it 
doesn't mean less heat is being extracted.  My assertion is that since the 
water 
near the outlet is cooler it imparts less heat into the air stream at that 
point.  Or another way to look at it, since the average temperature of the 
water 
is less there is less heat transfer.

The concept that water moving too fast through the radiator will result in 
less cooling is an urban myth.

Dave


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