Research on Performance of Finned Tube Bundles of Indirect Air-cooled Heat Exchangers

Zhang, Wei; Du, Xiaoze; Yang, Linlin; Yang, Yongping

doi:10.18280/mmep.030108

Cited by 8 publications

(7 citation statements)

References 0 publications

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“…Therefore, when the steam velocity in an ACC system is higher than 40 m/s, it is necessary to establish a product between the results obtained by using equation (16) and (17) with Equation (22), to obtain the heat transfer coefficient [31][32][33][34].…”

Section: Trawl Analysis Caused By High Vapor Velocitiesmentioning

confidence: 99%

Evaluation of condensation heat transfer in air-cooled condenser by dominant flow criteria

Camaraza-Medina¹,

Khandy²,

Carlson³

et al. 2018

MMEP

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In this paper, a modification to the dominant flow criteria is presented for the study of heat transfer by confined condensation in Air Cooled Condenser (ACC) systems. The new methodology combines in one single procedure the analysis, which with the current methods requires tedious grouping processes. A new proposal reduces the average error by computing 22% in 88.7% of the available samples and includes the shear stress produced by the steam drag when it flows at speeds greater than 40 m/s. New method is also valid for a vapor quality located between 0.9 and steam flows between 3 and 590 kg/(m2/s-1), values for the Reynolds number for the liquid portion between 660 and 58 540 and the Reynolds number for the vapor portion located between 1 320 and 333 120, internal equivalent diameters of the tubes comprised between 7.4 to 49 mm.

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Section: Trawl Analysis Caused By High Vapor Velocitiesmentioning

confidence: 99%

Evaluation of condensation heat transfer in air-cooled condenser by dominant flow criteria

Camaraza-Medina¹,

Khandy²,

Carlson³

et al. 2018

MMEP

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“…In any arrangement of tube bank, heat transfer coefficient increases from the first row to the third, and takes a constant value from the latter. In figure 7 and 8 are plotted for staggered and in-line arrangements, respectively, the average experimental values reported by the authors [19][20][21][22] for the first three rows of a tube package of an ACC, for…”

Section: Fluid Crossing Of a Finned Tubes Bank And His Influence On Lmentioning

confidence: 99%

Simplified analysis of heat transfer through a finned tube bundle in air cooled condenser-second assessment

Camaraza-Medina¹,

Rubio-Gonzale²,

Cruz-Fonticiella³

et al. 2018

MMEP

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This paper present a review of mathematical procedures for heat transfer studies in cross flow through finned tube pack. Is given a new model for heat transfer calculations during airflow through finned tubes bank in air cooled condenser systems (ACC). The model was correlated with a total of 783 sets of available experimental data provided by ten authors of recognized prestige in the research area. The air flow bathes a package of finned tubes with an inclination of 45 0 to 60 0 with respect to the horizontal line. The studies were performed for ST/SL intervals between 0.4 and 2, air flow velocity of 0.1 to 100 m/s, an ambient temperature of 15 to 43°C, the incident wind velocity over the installation between 0 and 45 km/h, the outer equivalent diameter of the bare tubes between 0.019 and 0.05 m, a fins height between 2.7 and 7.9 mm.The fins thicknesses ranging between 1.3 and 3.5 mm and a number of fins per unit tube length between 315 and 394. The mean deviation found was 6.9% in 85.3% of the correlated experimental data.

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“…It is difficult to restore the situation in the test results and there are errors in the results obtained. The numerical simulation based on CFD has the advantages of low cost and repeatable calculation, and is the most frequently used research method at present [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Analysis of wind resistance of high-rise building structures based on computational fluid dynamics simulation technology

Liu¹,

Liu²,

Liu³

2018

IJHT

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This study focuses on wind resistance of high-rise building structures. Firstly, the monitoring results of wind tunnel test are compared with the numerical simulation results based on CFD to verify the feasibility of the CFD numerical method, and the wind pressure coefficients of full-size structures and multi-type high-rise buildings are analyzed with the CFD algorithm. The results show that the monitoring results based on wind tunnel test and CFD simulation are very similar, and the distribution of the overall wind pressure coefficients is basically the same. As seen in top view and elevation view of wind pressure coefficient contours for full-size building structures, the wind pressure coefficient on the windward side and leeward side of a full-size building is relatively small, and the wind pressure coefficient in the incoming wind side is relatively large, which is because of the influence of Reynolds Number Effect in the area of the incoming wind side, which results in the relatively greater negative pressure on the lateral side of the building. The contour distribution of wind pressure coefficients for different types of buildings is generally similar, indicating that the shape of buildings has basically no effect on the distribution of wind pressure coefficients. This study establishes static pressure field fitting curves for the windward, crosswind, upwind, and leeward directions. The "static pressure corridor" can accurately determine the zero pressure position, and long-term monitoring at the point with zero pressure can achieve the best test results.

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Research on Performance of Finned Tube Bundles of Indirect Air-cooled Heat Exchangers

Cited by 8 publications

References 0 publications

Evaluation of condensation heat transfer in air-cooled condenser by dominant flow criteria

Evaluation of condensation heat transfer in air-cooled condenser by dominant flow criteria

Simplified analysis of heat transfer through a finned tube bundle in air cooled condenser-second assessment

Analysis of wind resistance of high-rise building structures based on computational fluid dynamics simulation technology

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