The Periodic Method for Testing Compact Heat Exchanger Surfaces

[+] Author and Article Information
J. H. Stang

Cummins Engine Co., Technical Center, Columbus, Ind.

J. E. Bush

Marquette University, Milwaukee, Wisc.

J. Eng. Power 96(2), 87-94 (Apr 01, 1974) (8 pages) doi:10.1115/1.3445767 History: Received August 18, 1972; Online July 14, 2010


The regular periodic method for testing the heat transfer performance of heat exchanger cores is studied in detail. This method, which has received very limited attention in the past, has certain advantages over the more conventional steady-state technique. It is shown to be useful especially in testing matrix surfaces. A theoretical analysis is performed, forming the basis for the periodic method. Directions for use in the range 0.2 < Ntu < 50, an uncertainty analysis, and test results for 2.6 < Ntu < 36.6 are included. It is concluded that the periodic method has the major advantages of: a wide Ntu range, easily generated experimental temperature waves, and the accuracy of an integral technique.

Copyright © 1974 by ASME
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