Al Gietzen wrote:

Actually, it is quite significant.  Although the specific is only about

12%

lower, the density is about 20% lower; resulting in the 50/50 glycol/h20
carrying nearly 40% less heat for the same flow rate (1/.8) x (1.12/1) =
1.40.

Perhaps I should clarify further; this doesn't mean that you would be
rejecting 40% less heat.  It means that the temperature drop around the loop
will be greater; say 30 F instead of 20 F, lowering the average radiator
temperature, and therfore reducing the heat rejection rate to the air.  On a
cool day, you may not notice much difference; or if you have excess cooling
capacity you may never notice a difference.

Al

 
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