Analysis of coiled-tube heat exchangers to improve heat transfer rate with spirally corrugated wall

This paper presents the effect of the changes in fin geometry on pressure drop and heat transfer characteristics of louvered fin heat exchanger numerically. Three dimensional simulation using ANSYS Fluent have been conducted for six different configurations at Reynolds number ranging from 200 to 1000 based on louver pitch. The performance of this system has been evaluated by calculating pressure drop and heat transfer coefficient. The result shows that, the fin pitch and the louver pitch have a very considerable effect on pressure drop as well as heat transfer rate. It is observed that increasing the fin pitch will relatively result in an increase in heat transfer rate but at the same time, the pressure drop will decrease. On the other hand, low pressure drop and low heat transfer rate will be obtained when the louver pitch is increased. Final result shows a good agreement between experimental and numerical results of the louvered fin which is about 12%. This indicates the capability of louvered fin in enhancing the performance of heat exchangers.

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Development of the Latent Heat Storage System Using Phase Change Material with Insertion of Helical Fins to Improve Heat Transfer Rate

Lecture Notes in Mechanical Engineering - Advances in Electromechanical Technologies ◽

10.1007/978-981-15-5463-6_75 ◽

2020 ◽

pp. 843-853

Author(s):

Vishal Godase ◽

Ashok Pise ◽

Avinash Waghmare

Keyword(s):

Heat Transfer ◽

Phase Change ◽

Phase Change Material ◽

Heat Transfer Rate ◽

Latent Heat ◽

Transfer Rate ◽

Storage System ◽

Latent Heat Storage ◽

Improve Heat Transfer ◽

Change Material

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Numerical analysis on enhancement of recirculation in porous medium to improve heat transfer rate

10.1063/5.0026572 ◽

2020 ◽

Author(s):

Siddhartha Gollamudi ◽

Dineshkumar L.

Keyword(s):

Heat Transfer ◽

Porous Medium ◽

Numerical Analysis ◽

Heat Transfer Rate ◽

Transfer Rate ◽

Improve Heat Transfer

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Heat Transfer Analysis of Shell-and-Helical-Coil Heat Exchangers

Volume 8: Heat Transfer and Thermal Engineering ◽

10.1115/imece2016-68173 ◽

2016 ◽

Author(s):

Anthony Edward Morris ◽

C. S. Wei ◽

Runar Unnthorsson ◽

Robert Dell

Keyword(s):

Heat Transfer ◽

Heat Transfer Rate ◽

Heat Exchangers ◽

Transfer Rate ◽

Green Roofs ◽

Heat Transfer Analysis ◽

Helical Coil ◽

Straight Tube ◽

Science And Art ◽

Coil Heat

Since 2006, The Center for Innovation and Applied Technology (CIAT) at Cooper Union for the Advancement of Science and Art has been developing a system to use thermal pollution to heat the growth medium of green roofs. CIAT is researching various apparatus and techniques, including shell-and-tube and shell-and-coil heat exchangers, to improve its heated ground agricultural projects. There are limited recorded observations on shell-and-coil heat exchangers; therefore a laboratory work station was created of interchangeable components to test the efficiency of a variety of coil designs. This paper discusses the data collected on temperature, pressure, and flow rates for a straight tube and two different helical coils. The analysis of this data indicates the superiority of a helical coil design when compared to a straight tube design with respect to both rating and heat transfer rate. The same data analysis has lead to preliminary observations on how the contour properties of a helical coil influence the heat transfer rate through a coil. The authors intend to further this helical coil research to develop a useful mathematical model for determining efficient designs for shell-and-coil heat exchangers.

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A generalized moving-boundary algorithm to predict the heat transfer rate of counterflow heat exchangers for any phase configuration

Applied Thermal Engineering ◽

10.1016/j.applthermaleng.2014.12.028 ◽

2015 ◽

Vol 79 ◽

pp. 192-201 ◽

Cited By ~ 24

Author(s):

Ian H. Bell ◽

Sylvain Quoilin ◽

Emeline Georges ◽

James E. Braun ◽

Eckhard A. Groll ◽

...

Keyword(s):

Heat Transfer ◽

Heat Transfer Rate ◽

Heat Exchangers ◽

Transfer Rate ◽

Moving Boundary

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Thermal Assessment of Forced Convection Through Metal Foam Heat Exchangers

Journal of Heat Transfer ◽

10.1115/1.4004530 ◽

2011 ◽

Vol 133 (11) ◽

Cited By ~ 27

Author(s):

A. Tamayol ◽

K. Hooman

Keyword(s):

Heat Transfer ◽

Thermal Resistance ◽

Forced Convection ◽

Heat Transfer Rate ◽

Heat Exchangers ◽

Transfer Rate ◽

Metal Foam ◽

Convection Heat Transfer ◽

Geometrical Parameters ◽

Convection Heat

Using a thermal resistance approach, forced convection heat transfer through metal foam heat exchangers is studied theoretically. The complex microstructure of metal foams is modeled as a matrix of interconnected solid ligaments forming simple cubic arrays of cylinders. The geometrical parameters are evaluated from existing correlations in the literature with the exception of ligament diameter which is calculated from a compact relationship offered in the present study. The proposed, simple but accurate, thermal resistance model considers: the conduction inside the solid ligaments, the interfacial convection heat transfer, and convection heat transfer to (or from) the solid bounding walls. The present model makes it possible to conduct a parametric study. Based on the generated results, it is observed that the heat transfer rate from the heated plate has a direct relationship with the foam pore per inch (PPI) and solidity. Furthermore, it is noted that increasing the height of the metal foam layer augments the overall heat transfer rate; however, the increment is not linear. Results obtained from the proposed model were successfully compared with experimental data found in the literature for rectangular and tubular metal foam heat exchangers.

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