OCTOBER 19-20, 2012 - YMCA University of Science & Technology

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Proceedings of the National Conference on Trends and Advances in Mechanical Engineering, YMCA University of Science & Technology, Faridabad, Haryana, Oct 19-20, 2012 2. Miroslav Kljajić, Dušan Gvozdenac, Srdjan Vukmirović,” Use of Neural Networks for modeling and predicting boiler's operating performance”, Energy, March 2012. 3. Zhongsheng Niu, Kau-Fui V. Wong, “Adaptive simulation of boiler unit performance”, Energy Conversion and Management, Volume 39, Issue 13, 1 September 1998, Pages 1383-1394. 4. Energy Performance Assessment of Boilers, Bureau of Energy Efficiency, March 2008. 5. M.A. Rosen, “Assessing Energy Technologies and Environmental Impacts with the Principles of Thermodynamics”, Applied Energy, 72, 427 – 441, 2002. 6. T. H. Durkin, “Boiler System Efficiency”, ASHRAE Journal (Vol. 48, July 2006. 166
Proceedings of the National Conference on Trends and Advances in Mechanical Engineering, YMCA University of Science & Technology, Faridabad, Haryana, Oct 19-20, 2012 SHELL SIDE CFD ANALYSIS OF A SMALL SHELL-AND-TUBE HEAT EXCHANGER CONSIDERING THE EFFECTS OF BAFFLE INCLINATION ON FLUID FLOW Abdur Rahim 1* , S.M.Saad Jameel 2 Department of Mechanical Engg, Faculty of Engineering and Technology, Jamia Millia Islamia, New Delhi – 110025, India. E-mail: 1 rahim_ark@rediffmail.com, 2 saadj11@gmail.com Abstract The shell side design of a shell-and-tube heat exchanger; in particular the baffle cut and baffles inclination dependencies of the heat transfer coefficient and the pressure drop are investigated by numerically modeling a small heat exchanger. The flow and temperature fields inside the shell are resolved using a commercial CFD software tool STAR CCM+ v6.06. In this present work, attempts were made to investigate the impacts of various baffle inclination angles on fluid flow and the heat transfer characteristics of a shell-and-tube heat exchanger for three different baffles inclination angles namely 0°, 10° and 20°. The simulation results for various shell and tube heat exchangers, one with segmental baffles perpendicular to fluid flow and two with segmental baffles inclined to the direction of fluid flow are compared for their performance. The results are observed to be sensitive to the turbulence model selection. For a given baffle cut of 36 %, the heat exchanger performance is investigated by varying mass flow rate and baffle inclination angle. From the CFD simulation results, the shell side outlet temperature, pressure drop, recirculation near the baffles, heat transfer, optimal mass flow rate and the optimum baffle inclination angle for the given heat exchanger geometry are determined Keywords: Shell-and-tube heat exchanger, CFD, Conjugate Heat Transfer, Pressure drop, Baffle inclination angle, turbulence models. 1. Introduction Heat exchangers have always been an important part to the lifecycle and operation of many systems. A heat exchanger is a device built for efficient heat transfer from one medium to another in order to carry and process energy. Typically one medium is cooled while the other is heated. They are widely used in petroleum refineries, chemical plants, petrochemical plants, natural gas processing, Air conditioning, refrigeration and automotive applications. One common example of a heat exchanger is the radiator in a car, in which it transfers heat from the water (hot engine-cooling fluid) in the radiator to the air passing through the radiator. There are two main types of heat exchangers. • Direct contact heat exchanger, where both media between which heat is exchanged are in direct contact with each other. • Indirect contact heat exchanger, where both media are separated by a wall through which heat is transferred so that they never mix. Shell and tube type heat exchanger is an indirect contact type heat exchanger as it consists of a series of tubes, through which one of the fluids runs. The shell is a container for the shell fluid. Usually, it is cylindrical in shape with a circular cross section, although shells of different shapes are used in specific applications. For this particular study E shell is considered, which is generally a one pass shell. E shell is the most commonly used due to its low cost and simplicity, and has the highest log-mean temperature-difference (LMTD) correction factor. Although the tubes may have single or multiple passes, there is one pass on the shell side, while the other fluid flows within the shell over the tubes to be heated or cooled. Shell-and-tube heat exchangers in various sizes are widely used in industrial operations and energy conversion systems. Tubular Exchanger Manufacturers Association (TEMA) regularly publishes standards and design recommendations. The tube side and shell side fluids are separated by a tube sheet, Gaddis [1], Schlunder [2], Mukherjee [3]. The heat exchanger model used in this study is a small sized one, as compared to the main stream, all of the leakage and bypass streams do not exist or are negligible, Ender Ozden and Ilker Tari [4] , Uday Kapale and Satish Chand [5], Thirumarimurugan et al. [6]. Baffles are used to support the tubes for structural rigidity, preventing tube vibration and sagging and to divert the flow across the bundle to obtain a higher heat transfer coefficient. Baffle spacing (B) is the centre line distance between two adjacent baffles, Sparrow and Reifschneider [7], Li and Kottke [8], Su Thet Mon Than et al. [9]. Baffle is provided with a cut (Bc) which is expressed as the percentage of the segment height to shell inside diameter. Baffle cut can vary between 15% and 45% of the shell inside 167
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3.2 Effect of Different Dielectric
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II. III. IV. Proceedings of the Nat
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References Proceedings of the Natio
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Sl No. Sequence of operation Table
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‣ Maximize the degree of efficien
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OCTOBER 19-20, 2012 - YMCA University of Science & Technology

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