Asymptotic effectlveness-NTU formulas for multipass plate heat exchangers

Satish Kandlikar
R. Shah

Journal of Heat Transfer article.The full article is published by the American Society of Mechanical Engineers and is available at: .Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works in February 2014.


The effectiveness of a plate heat exchanger with a finite number of plates is affected by the end channels, and the channels between two adjacent passes. These effects become less significant as the number of thermal plates becomes large, N > 40, as shown by Kandlikar and Shah (1989). In the present paper, closed-form equations are derived for plate heat exchangers with N = 00 in terms of temperature effectiveness PI as a function of the capacity rate ratio RI and the number of transfer units NTUI for the following pass arrangements: 1-1, 2-1, 2...2, 3-1, 3-2, 3-3, 41, 4-2, 4-3, and 4-4.