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

Abstract

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.

Temperature effect on thermal-hydraulic performance of one-pass counter-current flow shell-and-tube heat exchanger and upon its design

“…In this regime, all the curves supplying G coincide and the type of the heat exchanger and fluids flow directions are no longer important. These results are in a good agreement with the literature [23,24]. In the second regime, we clearly observe that the change of G has the same trend for all models.…”

“…For R values close to 1, our results based on our model agree with those obtained by Magazoni, F. C., et al [23], particularly for M < 0 and R equal 0,7 and 1.…”

“…7). These results are also in a good agreement with the literature of the previous work theoretical and experimental [23,24]. Hereafter, we have accomplished the validation of our proposed procedure and results of efficiency G by comparing them to the experimental results realised by Emad M.S.…”

Fouling in Industrial Heat Exchangers: Formation, Detection and Mitigation

“…In general, a heat transfer surface separates the fluid for most heat exchangers. This surface incorporates a wide range of different flow configurations to achieve the desired performance in different applications [9,10]. Heat exchangers can be classified in many different ways.…”

Evaluación térmico-hidráulica de un intercambiador de calor de tubo y coraza para el calentamiento de acetona

“…En otro estudio, (Singh & Pal, 2016), evaluaron el rendimiento de un intercambiador de calor de tubo y coraza utilizando la Dinámica Computacional de Fluido, con el fin de estudiar los perfiles de temperatura y velocidad a través de los tubos y la coraza, encontrando que la transferencia de calor a través de la longitud de los tubos no es uniforme. Por otro lado, (Magazoni et al, 2019) propusieron y aplicaron una metodología computacional para calcular la efectividad de temperatura y el factor de corrección de la Media Logarítmica de la Diferencia de Temperatura (MLDT) de intercambiadores de calor de tubo y coraza del tipo TEMA E con un pase por los tubos operando bajo flujo a contracorriente. La metodología propuesta se basó en varias consideraciones de modelación adoptadas en diferentes publicaciones, que toman en cuenta los intercambiadores de calor de tubo y coraza con flujo a contracorriente, mientras que los resultados obtenidos son comparados con las soluciones disponibles en la literatura, mostrando una concordancia aceptable entre sí.…”