Experimental Techniques to Determine Ntu of Compact Heat Exchanger Surfaces
Bruno, Marco Joseph
Pucci, Paul F.
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Two new transient testing techniques were evaluated; the centrold 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 < 2.5. The centrold technique can be used effectively when the value of N 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.