Closed form relationships of temperature effectiveness of cross-flow heat exchangers

Magazoni, Felipe; Cabezas‐Gómez, Luben; Alvariño, Pablo Fariñas; Saíz-Jabardo, José Maria

doi:10.1016/j.tsep.2018.11.005

Cited by 9 publications

(9 citation statements)

References 16 publications

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“…It is not surprising that an increase in the hot fluid's inlet temperature increases the temperature differences of the hot and cold fluids. A past study [37] provided several cross-flow configurations and explained the correlation between the effectiveness and the temperature difference which is in line with the obtained results in the present study.…”

Section: Temperature Difference and Effectivenesssupporting

confidence: 92%

Performance Analysis of a Printed Circuit Heat Exchanger with a Novel Mirror-Symmetric Channel Design

et al. 2021

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The printed circuit heat exchanger (PCHE) is a promising waste heat recovery technology to improve energy efficiency. The current investigation presents the experimental results on the thermal performance of a novel PCHE for low-temperature waste heat recovery. The novel PCHE was manufactured using precision machining and diffusion bonding. The thermal performances, such as effectiveness and NTU values at different temperatures, are evaluated, and water is used as a working fluid. The experimental results indicate that the PCHE’s effectiveness is around 0.979 for an inlet flow temperature of 95 °C. The predominant factors affecting the thermal performance of the PCHE are the inlet flow temperature and the flow rate of the working fluid. In addition, a comparison of the experimental results and the literature shows that the effectiveness of the PCHE is better than the others, which have fewer layers of PCHE fins.

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Section: Temperature Difference and Effectivenesssupporting

confidence: 92%

Performance Analysis of a Printed Circuit Heat Exchanger with a Novel Mirror-Symmetric Channel Design

et al. 2021

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“…In the Equation (12), the term = − 2 ⁄ is the heat turbulent diffusivity. Substituting Equation (8) into Equation (1):…”

Section: Analogy Between Heat Transfer and Momentum In Single-phase Fmentioning

confidence: 99%

“…Dividing Equation 17by the Equation 14is obtained the basic relationships for the fluid flow inside of tubes [6][7][8][9]:…”

Section: Analogy Between Heat Transfer and Momentum In Single-phase Fmentioning

confidence: 99%

Suggested Model for Heat Transfer Calculation During Fluid Flow in Single Phase Inside Pipes (II)

Camaraza-Medina¹,

Mortensen-Carlson²,

Guha³

et al. 2019

IJHT

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In this paper, is presented a mathematical deduction of a new improved model for heat transfer calculations during fluid flow in single-phase inside tubes. The proposal model was verified by comparison with available experimental data of 35 different fluids, including water, air, gases and organic substances. The proposal model is valid for a range of Reynolds number for single-phase from 2.4 • 10 3 to 8.2 • 10 6 , Prandtl number for single-phase from 0.65 to 4.71 • 10 4 , dimensionless length in the interval 2 ≤ ⁄ ≤ 450 and values of Petukhov's correction in the interval 0.006 ≤ ⁄ ≤ 177. In 3096 data analyzed, for < 1 • 10 4 , the mean deviation found was 13.91% in the 80.32% of the experimental data, while for 1 • 10 4 ≤ , the mean deviation found was 13.96% in 80.94% of experimental data.

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“…(9) and (10) of Table 7. Additional expressions for a larger number of baffles under model 2 mixing conditions could be obtained by applying the procedure introduced in this paper and were recently published by the authors (Magazoni et al, 2019).…”

Section: Closed-form Equationsmentioning

confidence: 99%

“…-New closed form expressions for P and approximate relations for the F factor are provided for two of the shell-side fluid mixture conditions as a function of the number of baffles. More relations can be accessed in the authors' recent work, Magazoni et al (2019).…”

Section: Introductionmentioning

confidence: 99%

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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Closed form relationships of temperature effectiveness of cross-flow heat exchangers

Cited by 9 publications

References 16 publications

Performance Analysis of a Printed Circuit Heat Exchanger with a Novel Mirror-Symmetric Channel Design

Performance Analysis of a Printed Circuit Heat Exchanger with a Novel Mirror-Symmetric Channel Design

Suggested Model for Heat Transfer Calculation During Fluid Flow in Single Phase Inside Pipes (II)

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

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