Airside friction and heat transfer characteristics for staggered tube bundle in crossflow configuration with diameters from 0.5 mm to 2.0 mm

Bacellar, Daniel; Aute, Vikrant; Huang, Zhiwei; Radermacher, Reinhard

doi:10.1016/j.ijheatmasstransfer.2016.02.072

Cited by 22 publications

(4 citation statements)

References 14 publications

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“…The values of c1–c13 are determined by the number of tubes, using the empirical formula of Daniel Bacellar 10 ; the values are shown in Tables 1 and 2.…”

Section: Methods and Modelsmentioning

confidence: 99%

Optimization of heat transfer performance of a micro‐bare‐tube heat exchanger using a genetic algorithm

Li,

Zhou,

Sangani

et al. 2023

Energy Science & Engineering

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This study presents the optimization of the heat transfer coefficient of a micro bare tube heat exchanger. A physical and mathematical model of a micro bare tube heat exchanger was built in Matlab using the simplified ε‐number of transfer unit method. Using a temperature of minus 30°C and a 0.5–1.0 mm tube outer diameter, a 1.7–8.0 mm longitudinal tube pitch, a 1.7–5 mm transverse tube pitch, and a 1.0–5.0 m/s velocity at minimum free flow area, with carbon dioxide as the refrigerant, a comparative variation analysis was performed to optimize the heat transfer coefficient of a micro‐bare‐tube heat exchanger. The results demonstrate that the heat transfer coefficient increases as the inlet air velocity is increased from 1.0 to 5.0 m/s, with a final gain of 93.17%. The growth rate of the heat transfer coefficient steadily decreases with increasing inlet air velocity and gradually approaches zero. The effect of the gradual decrease of the tube outer diameter from 1.0 to 0.5 mm on the heat transfer coefficient is 22.52% greater than that of the gradual decrease of the transverse tube pitch from 2.2 to 1.7 mm. The study also carried out an optimization analysis on the distribution of four different variables in the heat exchanger. With the use of a genetic algorithm, the study found an optimal distribution to maximize the heat transfer coefficient. The following parameter values resulted in the maximum heat transfer coefficient: a maximum inlet air velocity of 5.0 m/s, a minimum tube outer diameter of 0.5 mm, a 1.7 mm longitudinal tube pitch, and a 1.7 mm transverse tube pitch.

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“…The values of c1–c13 are determined by the number of tubes, using the empirical formula of Daniel Bacellar 10 ; the values are shown in Tables 1 and 2.…”

Section: Methods and Modelsmentioning

confidence: 99%

Optimization of heat transfer performance of a micro‐bare‐tube heat exchanger using a genetic algorithm

Li,

Zhou,

Sangani

et al. 2023

Energy Science & Engineering

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“…Study the air side friction equation and heat transfer characteristics for bare tube bank air heat exchanger coolers with variations in tube diameter of 0.5-2 mm and pitch ratio of 1.2 -4.0 and air velocity from 0.5 -7.0 m/s in simulation. It turns out that the predictions of the friction equation are more than 80% correlated based on experimental data sources [100]. Based on various studies on staggered bare tube heat exchangers, there is no information regarding the application of staggered bare tube bank heat exchangers as initial air heaters for seaweed convective dryers.…”

Section: Introductionmentioning

confidence: 99%

Thermal Performance of Staggered Bare Tube Bank Heat Exchanger as Air Pre-Heater for Seaweed Convective Dryer

Titahelu,

Tupamahu,

Tentua

et al. 2024

metiks

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Abstrak Pemanfaatan energi limbah panas pengering dengan suhu keluar < 55 C melalui penukar kalor tube bank bare staggered sebagai pemanas awal udara untuk pengeringan rumput laut. Penelitian bertujuan untuk mendapatkan kecepatan udara efektif dimana kinerja termal maksimum dan suhu udara keluar penukar kalor. Metode penelitian eksperimental dengan memvariasikan kecepatan udara 0,5 hingga 2,5 m/s pada ST, SL, D dan L konstan. Pengambilan data terukur kecepatan udara bebas, suhu fluida dingin, dan suhu fluida panas setelah sistem mencapai keadaan tunak. Hasil penelitian menunjukkan bahwa semakin meningkat kecepatan udara bebas maka semakin besar pula kinerja termal dan koefisien konveksi masing-masing sebesar 38,77% dan 38,05% pada kecepatan udara bebas maksimum. Sebaliknya semakin besar kecepatan udara bebas maka suhu keluar akan semakin menurun sebesar 99,60%, dimana suhu udara keluar maksimum berada pada kecepatan udara bebas 2,5 m/s sebesar 303,6 K atau kenaikan sebesar 1,9 derajat. Disimpulkan bahwa sebaiknya penukar kalor ini beroperasi pada kecepatan udara bebas 1,0 m/s guna menjaga keseimbangan kinerja termal dan suhu udara keluar.

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“…Taler et al 10 combined a nonlinear regression method to determine the correlation coefficient that defines liquid and airside heat transfer. Bacellar et al 11 proposed a framework to study the large design spaces of staggered bundles using automated CFD simulations, and to assess dimensionless thermo‐hydraulic performance on the airside using pipe diameter from 0.5 to 2.0 mm. Bergelin et al 12 reported pressure drop and heat transfer data for vertical tube rows in his study of tubular heat exchangers, providing a preliminary correlation between friction and heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Airside friction and heat transfer performance of micro‐bare‐tube heat exchangers with bundle diameters varying gradually from 1.0 to 0.4 mm

Gong,

Zhou,

Cai

et al. 2023

Energy Science & Engineering

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In this paper, a micro‐bare‐tube heat exchanger structure with the tube bundle diameter varying gradually in the range of 1.0–0.4 mm is proposed. The airside friction and heat transfer performance correlations for this structure are given. This paper applies CFD simulation to develop and verify the correlation of the diameter gradually varied micro‐bare‐tube heat exchangers' performance. Compared with the traditional same diameter micro‐bare‐tube heat exchanger, the new structure not only reduces the pressure drop, but also improves the thermal hydraulic performance. The friction coefficient f is decreased by 8.59%, the pressure drop is reduced by 43.14%, the heat transfer coefficient j is increased by 12.07% compared to the constant diameter micro‐bare‐tube heat exchanger. At the same time, it reduces the void volume by 47.32% and the tube bundle manufacturing material by 28.57%. The proposed airside performance prediction equation can make the error of more than 70% source data within 10%, and the error of more than 90% source data within 20%. It is suggested to apply this empirical equation to 7–29 rows.

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Airside friction and heat transfer characteristics for staggered tube bundle in crossflow configuration with diameters from 0.5 mm to 2.0 mm

Cited by 22 publications

References 14 publications

Optimization of heat transfer performance of a micro‐bare‐tube heat exchanger using a genetic algorithm

Optimization of heat transfer performance of a micro‐bare‐tube heat exchanger using a genetic algorithm

Thermal Performance of Staggered Bare Tube Bank Heat Exchanger as Air Pre-Heater for Seaweed Convective Dryer

Airside friction and heat transfer performance of micro‐bare‐tube heat exchangers with bundle diameters varying gradually from 1.0 to 0.4 mm

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