Mean Temperature Difference in Multipass Exchangers

Gardner, Karl A.

doi:10.1021/ie50384a006

Cited by 11 publications

(4 citation statements)

References 0 publications

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“…(ii) The tube-side fluid of the STHE is assumed to be unmixed. This is consistent with the assumption of a large number of tubes, commonly used in the literature (Underwood 1934;Bowman 1936;Fischer 1938;Bowman et al, 1940;Gardner 1941;Gardner and Taborek 1977;Shah and Pignotti, 1997;and others).…”

Section: Methodssupporting

confidence: 88%

“…(iii) Two mixing models for the shell-side fluid are considered. One, which is frequently applied in the open literature (Underwood 1934;Bowman 1936;Fischer 1938;Bowman et al, 1940;Gardner 1941;Gardner and Taborek 1977;Shah and Pignotti, 1997;and others), assumes that the shell-side fluid mixes only in the passage between two adjacent regions separated by the baffles, see Figure 3(a). This corresponds to a STHE without a significant mixture of shell-side fluid during the flow across the tube array, but with a significant mixture in the window zone, i.e., the passage between regions separated by baffles.…”

Section: Methodsmentioning

confidence: 99%

“…After Nagle (1933), other authors provided different solutions for several STHE. Important contributions are those by Underwood (1934), Bowman (1936), Fischer (1938), Bowman et al (1940), Gardner (1941), Kraus and Kern (1965), and Gardner and Taborek (1977). Underwood (1934) obtained the first closed-form solutions for 1-2 and 1-4 TEMA E STHE in terms of the true mean temperature difference by direct integration of the corresponding differential equations.…”

Section: Introductionmentioning

confidence: 99%

“…Bowman et al (1940) presented an in-depth analysis of multi-pass STHE, summarizing the previous literature. Gardner (1941) presented correction factors for shell-and-tube heat exchangers considering the shell fluid to be unmixed for 1-2, 1-4, 1-6, 1-8, 1-n, and 2-4 STHE, where n is an even number of tube fluid passes. Kraus and Kern (1965) solved the problem of 1-2 and 2-4 TEMA E STHE with one shell pass and even number of tube passes using a direct integration method.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Performance of One-Pass Shell-and-Tube Heat Exchangers in Counter-Flow

Magazoni

Cabezas‐Gómez

Alvariño

et al. 2019

Braz. J. Chem. Eng.

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A computational methodology is proposed and applied to calculate the temperature effectiveness, P, and the logarithmic mean temperature difference (LMTD) correction factor, F, of TEMA E shell-and-tube heat exchangers with one-pass and fluids flowing in counter-flow. An arbitrary number of baffles is considered along with three different mixture conditions of the shell-side fluid. The methodology is based on various modeling considerations adopted in several publications addressing crossflow and shell-and-tube heat exchangers. Each section between two baffles is idealized as a crossflow heat exchanger with different shell-side mixing conditions. The obtained results are compared to available solutions from the literature, showing a very good agreement. New closed-form mathematical P relations and approximate F correlations depending on the number of baffles, very appropriate for preliminary computerized analysis and design procedures, are provided. A theoretical study about the influence of the number of baffles and two shell-side fluid mixing hypotheses over P and F values is presented. The proposed methodology could be used to obtain P and F values for a particular arrangement of 1-1 shell-and-tube heat exchanger.

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