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 = ∞ in terms of temperature effectiveness P1 as a function of the capacity rate ratio R1 and the number of transfer units NTU1 for the following pass arrangements: 1–1, 2–1, 2–2, 3–1, 3–2, 3–3, 4–1, 4–2, 4–3, and 4–4.

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