Experimental Techniques to Determine N(sub tu) of Compact Heat Exchanger Surfaces
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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Two new transient testing techniques were evaluated the centroid method developed by Kohlmayr and the time zero intercept technique. The zero intercept method was found to be the most promising of the two but is limited to values of N sub tu 2.5. The centroid technique can be used effectively when the value of N sub tu is less than 5.0. A heater system made of .001 inch diameter nichrome wire was designed and tested to determine its effect on the transient testing of matrix type heat exchangers. Because the design showed no improvement in the test results and was unreliable its use was discontinued.
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