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Dave,
With respect to plumbing them in series; The heat
transfer rate is dependant upon the delta (temperature
difference) temperature between the coolant and the air (for simplicity the
thermal conductivity of the radiator medium is snot being considered.) By
plumbing in series the second exchanger will have a lower rate of thermal
transfer and result in lower BTU rejection if the total
system. Plumbing in series is likely to also reduce flow rate ( as you
noted by higher pressure.) The lowest return temp may not indicate the
optimum system for heat removal. IMO (given the same radiator area,
thickness, renolds number, etc.) the higher the coolant to air temp
difference and the highest flow rate should yield the system that removes the
greatest BTUs.
JOe
----- Original Message -----
Sent: Sunday, September 11, 2005 9:41
PM
Subject: [FlyRotary] Re: Optimal GPM
water pump flow.
Al.
What I am after is trying to determine what
the minimum required flow is for the horsepower generated. More than
anything else, I do not want to be BELOW that amount, and consider it a
minimum. Understandably, trying to place twice or nearly 3 times the flow
through the same circuit will result in higher pressures and perhaps some pump
cavitation. I will deal with that as I have to.. more than anything else I
want to make sure I am not starting off with a DEFICIT of water flow
ability.
I am considering 2 smaller radiators, and originally I
intended to plumb them in series to get the best cumulative Delta-T across
them, but if I have "pressure" problems due to the pump's flow, I may go to a
parralel arrangement.
Feel free to critique, Al.. My cooling
system is a work in progress that is evolving. I live in a place that has 100
degree temps with 90% humidity at times, and given the other folks
demonstrated problems with inadequate cooling, I am very much in favor of
designing in excess cooling capacity, to the point I may even incur a slight
weight or drag penalty, such that I don't have to give constant attention to
the risk of overheating.
Dave
Al Gietzen wrote:
Subject: [FlyRotary]
Re: Optimal GPM water pump flow.
www.racemate.com They were unable to find the photo of the Mazda install but they say the did a few. I am going to take the plunge and get one..
Dave Just curious what you’re after with the racemate. You were asking about “optimal” flow – double the needed flow is not optimum; high pressure gradients around the loop, unnecessary pumping power. Al
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