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The Periodic Technique for Testing Compact Heat Exchanger Surfaces

John H. StangStanford University. Department of Mechanical EngineeringJ. E. Bush

出版	Stanford University. Department of Mechanical Engineering, 1968
URL	http://books.google.com.hk/books?id=qC8EAAAAIAAJ&hl=&source=gbs_api

註釋

The transient technique of testing the heat transfer performance of heat exchanger cores is used because of certain advantages for highly compact surfaces over the more conventional steady-state technique. There are two methods of employing the transient technique, the single blow method and the periodic (or cyclic) method. The single blow method has been used the most and it is reasonably well refined in the test range where the maximum slope evaluation can be used. The periodic method, which has received very limited attention in the past, is the object of study in this report. The equations governing the transient behavior of an ideal heat exchanger are developed and solved for the periodic case. These solutions are used to provide data reduction relations based on the amplitude attenuation and phase shift of the fluid temperature at the core outlet. These relations are then examined to determine when the heat transfer data is least sensitive to temperature measurement uncertainties. (Author).