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When I hear about using the fuel as a heat sink, all I can think of is TWA 800.
Please be careful............... |
Mike, TWA went down because of fuel vapors exploding the center tank due to chafed wires arching. We won't have electrical inside any fuel tank! We also aren't looking at temperatures that will be close to boiling point or autoignition temperature.
We will follow your advice of being careful though!!!! |
Good, awareness was my goal.
Good luck with the project. |
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These are popular on race car stuff: http://laminovapro.com/ http://laminovapro.com/laminova-oil-cooler-information/ |
And
Many commercial aircraft use fuel to cool...things...
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One point seemingly overlooked here (and it might be me) is the fact that aircraft using fuel for cooling "stuff" are dealing with thousands of gallons and rely on huge thermal mass. There is very little "cooling" due to the airflow over the wings. The concept was explored quite a bit with wartime development and found unworkable for engine cooling. Seems to me that pumping a high thermal load into a small and rapidly diminishing quantity of fuel is a thermal runaway event in the making.
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Jet A boils at 375F, EGW boils at 230-250F. Both depending on the pressure of course, BUT the numbers - specific heat of Jet-A is 43% of water, and thermal conductivity is 17% of water. Both of which will drive up operating temperatures for the cooling system. It is certainly possible too cool this way, and we wont engineer within this forum, but it is quite different and having AES involved for the whole system is a real advantage. They will have access to data that is hard to get otherwise. |
The driving requirement seems to be a need for 130F fuel at injection delivery. The question is thus how to heat the fuel.
Having brainstormed a fuel-cooled system, sit down and map out system components with conventional coolant. Make a hard comparison. Fuel heating could easily be done via a simple tubular passage through one of the tanks on the water-to-air exchanger, just as transmission and engine oil is temperature regulated in automobiles. Very conventional, relatively safe, with high acceptance. |
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