International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 04 | Apr -2017
p-ISSN: 2395-0072
www.irjet.net
Optimization of Heat Transfer Process Parameters of Tube and Tube Heat Exchanger using CFD M. V. S. Pavan Kumar1, J. Vijay Kumar2, Sk. Salman Basha3 Asst. Professor, Dept. of Mechanical Engineering, Sasi Institute of Technology and Engineering, AP, India ---------------------------------------------------------------------***--------------------------------------------------------------------1,2,3
Abstract - Heat exchanger is a device which is used to transfer heat from hot fluid to cold fluid. These exchangers are used in industrial purposes like chemical industries, nuclear power plants, refineries, food processing, etc. Effectiveness of heat exchanger is an important parameter while selection of industrial heat exchangers. Sizing of heat exchangers play very significant role for cost optimization. Methods for improvement on heat transfer have been worked upon for many years in order to obtain maximum effectiveness and efficiency with optimum cost. The present work carried out to optimize the process parameters of tube and tube parallel flow heat exchanger experimentally and simulation of CFD without baffle plates by changing the velocity of hot fluid, mass flow rate of cold fluid and inlet temperature of hot fluid. Finally, comparison between Experimental results and simulation results of CFD done.
process. Final Results are obtained with three different types of materials steel, aluminum and copper. As we increase the fin thickness the temperature of the cold fluid at the outlet of the heat exchanger increases [1]. Heat exchangers are the equipment used in industrial processes to recover heat between two process fluids. They are widely used in space heating, refrigeration, air conditioning, power plants, chemical plants petrochemical plants, petroleum refineries, and natural gas processing. Therefore, the objective of present work involves study of refinery process and applies phenomena of heat transfer to a double pipe heat exchanger. As we increase the fin thickness the temperature of the cold fluid at the outlet of the heat exchanger increases. The simulated outlet temperature is 543k which is very near to design outlet temperature 553k. There is less than 3% variation occurs than design value [2]. Unfortunately, in normal practice the effect of the heat transfer process on the flow patterns cannot be observed as they take place in a nontransparent metal bodies. As such, and because of the fact that direct measurements of flow characteristics can be time consuming. By taking this into consideration we can approximate the flow characteristics like temperatures using simulation software. Now a day’s Computational Fluid Dynamics (CFD) is used for simulation due to low research cost, short research period and detailed description to fluid dynamic behavior, computational fluid dynamics have received rapid development in recent decades. In this study, commercial CFD software was used to simulate heat transfer process of tube and tube heat exchanger.
Keywords: Heat Exchanger, Effectiveness, Optimization, Parallel Flow, CFD.
1.INTRODUCTION Heat exchangers are devices that facilitate the exchange of heat between two fluids that are at different temperatures while keeping them from mixing with each other. Heat exchangers are commonly used in practice in a wide range of applications, from heating and air-conditioning systems in a household, to chemical processing and power production in large plants. Heat exchangers differ from mixing chambers in that they do not allow the two fluids involved to mix. In a car radiator, for example, heat is transferred from the hot water flowing through the radiator tubes to the air flowing through the closely spaced thin plates outside attached to the tubes. The heat exchangers can be broadly divided into various types based on the direction of fluid motion, constructional features of the heat exchanger. According to the relative direction of two fluid streams the heat exchangers are classified into three categories. Parallel flow or unidirectional flow, Counter flow and Cross flow. The Heat Exchanger is a device used to exchange the heat energy between the two fluids by which increases the operating efficiency. These efficiencies play a major role for cost effective. Operations in the process industries. While the both fluids flow through the heat exchanger, the temperature of both fluids will exchange. The main objective of this paper is deals with the performance rate of double pipe heat exchanger. By changing the materials which uses the heat input from the waste recovery of steam in refinery
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2. EXPERIMENTAL ANALYSIS 2.1 Experimental Setup The apparatus of a concentric tube heat exchanger, one small diameter tube is fixed in another bigger diameter tube concentrically and outer tube is insulated to reduce the heat losses from its surface to the surroundings. The fluids which are used for transferring the heat are cold water and hot air. The cold water is supplied connecting the inlet to the common tap supply and its flow is controlled by providing inlet and outlet valves. For providing the hot air, a small blower and heater inside the tube placed respectively. The valves arrangement is made in such way, that the flow can be made parallel or counter as desired. The two thermometers are provided to measure the inlet and outlet temperatures of hot air and other two measures the inlet and outlet temperatures of cold water.
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