A simple solution for heat transfer in a triple tube heat exchanger

Abstract-The present work investigates the enhancement of heat transfer by using different number of circular fins (8, 10, 12, 16, and 20) in double tube counter flow heat exchanger experimentally. The fins are made of copper with dimensions 66 mm OD, 22 mm ID and 1 mm thickness. Each fin has three of 14 mm diameter perforations located at 120o from each to another. The fins are fixed on a straight smooth copper tube of 1 m length, 19.9 mm ID and 22.2 mm OD. The tube is inserted inside the insulated PVC tube of 100 mm ID. The cold water is pumped around the finned copper tube, inside the PVC, at mass flow rates range (0.01019 - 0.0219) kg/s. The Reynold's number of hot water ranges (640 - 1921). The experiment results are obtained using six double tube heat exchanger (1 smooth tube and the other 5 are finned one). The results, illustrated that the heat transfer coefficient proportionally with the number of fin. The results also showed that the enhancement ratio of heat transfer for finned tube is higher than for smooth tube with (9.2, 10.2, 11.1, 12.1 13.1) times for number of fins (8, 10, 12, 16 and 20) respectively.

Download Full-text

Air side heat transfer enhancement using radiantly arranged winglets in fin-and-tube heat exchanger

International Journal of Thermal Sciences ◽

10.1016/j.ijthermalsci.2020.106470 ◽

2020 ◽

Vol 156 ◽

pp. 106470

Author(s):

Mingjie Li ◽

Jingguo Qu ◽

Jianfei Zhang ◽

Jinjia Wei ◽

Wenquan Tao

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Heat Transfer Enhancement ◽

Transfer Enhancement ◽

Tube Heat Exchanger

Download Full-text

Numerical simulation of the effect of baffle cut and baffle spacing on shell side heat exchanger performance using CFD

Chemical Product and Process Modeling ◽

10.1515/cppm-2020-0033 ◽

2020 ◽

Vol 0 (0) ◽

Author(s):

Swanand Gaikwad ◽

Ashish Parmar

Keyword(s):

Heat Transfer ◽

Heat Transfer Coefficient ◽

Heat Exchanger ◽

Pressure Drop ◽

Transfer Coefficient ◽

Numerical Results ◽

Shell Side ◽

Tube Heat Exchanger ◽

Shell And Tube ◽

Two Parameters

AbstractHeat exchangers possess a significant role in energy transmission and energy generation in most industries. In this work, a three-dimensional simulation has been carried out of a shell and tube heat exchanger (STHX) consisting of segmental baffles. The investigation involves using the commercial code of ANSYS CFX, which incorporates the modeling, meshing, and usage of the Finite Element Method to yield numerical results. Much work is available in the literature regarding the effect of baffle cut and baffle spacing as two different entities, but some uncertainty pertains when we discuss the combination of these two parameters. This study aims to find an appropriate mix of baffle cut and baffle spacing for the efficient functioning of a shell and tube heat exchanger. Two parameters are tested: the baffle cuts at 30, 35, 40% of the shell-inside diameter, and the baffle spacing’s to fit 6,8,10 baffles within the heat exchanger. The numerical results showed the role of the studied parameters on the shell side heat transfer coefficient and the pressure drop in the shell and tube heat exchanger. The investigation shows an increase in the shell side heat transfer coefficient of 13.13% when going from 6 to 8 baffle configuration and a 23.10% acclivity for the change of six baffles to 10, for a specific baffle cut. Evidence also shows a rise in the pressure drop with an increase in the baffle spacing from the ranges of 44–46.79%, which can be controlled by managing the baffle cut provided.

Download Full-text

Characterization of heat transfer on concentric tube heat exchanger using ethylene glycol/TiO2 nanofluid

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1034/1/012045 ◽

2021 ◽

Vol 1034 (1) ◽

pp. 012045

Author(s):

Herry Irawansyah ◽

Abdul Ghofur ◽

Rachmat Subagyo ◽

Mastiadi Tamjidillah ◽

Bagus Harits Pratama ◽

...

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Ethylene Glycol ◽

Tube Heat Exchanger

Download Full-text

Experimental analysis and ANN prediction on performances of finned oval-tube heat exchanger under different air inlet angles with limited experimental data

Open Physics ◽

10.1515/phys-2020-0212 ◽

2020 ◽

Vol 18 (1) ◽

pp. 968-980

Author(s):

Xueping Du ◽

Zhijie Chen ◽

Qi Meng ◽

Yang Song

Keyword(s):

Heat Transfer ◽

Experimental Data ◽

Heat Exchanger ◽

Correlation Equation ◽

Tube Heat Exchanger ◽

Flow Friction ◽

Air Inlet ◽

Comparison Results ◽

Wide Range ◽

Oval Tube

Abstract A high accuracy of experimental correlations on the heat transfer and flow friction is always expected to calculate the unknown cases according to the limited experimental data from a heat exchanger experiment. However, certain errors will occur during the data processing by the traditional methods to obtain the experimental correlations for the heat transfer and friction. A dimensionless experimental correlation equation including angles is proposed to make the correlation have a wide range of applicability. Then, the artificial neural networks (ANNs) are used to predict the heat transfer and flow friction performances of a finned oval-tube heat exchanger under four different air inlet angles with limited experimental data. The comparison results of ANN prediction with experimental correlations show that the errors from the ANN prediction are smaller than those from the classical correlations. The data of the four air inlet angles fitted separately have higher precisions than those fitted together. It is demonstrated that the ANN approach is more useful than experimental correlations to predict the heat transfer and flow resistance characteristics for unknown cases of heat exchangers. The results can provide theoretical support for the application of the ANN used in the finned oval-tube heat exchanger performance prediction.

Download Full-text