The aim of the study is design tube and box heat exchanger with various pattern of tubes and examine the flow and temperature field at inlet and o utlet point of tube and container using ANSYS programming tool. Three types of heat exchangers are planned in this examination with various structures of cylinders contains of 175 mm breadth and 1000 mm length shell measurement 175 mm. To expand the rate o f heat exchange of heat exchanger advancement is done which tries to distinguish the best parameter combination of heat exchangers. The prefix parameter (tube width) is utilized as an info variable and the yield parameter is the most extreme temperature distinction of container and tube heat exchanger. Three types models are design on the basis tubes varieties of heat exchanger and CFX examination is completed in ANSYS 14.0. Keywords: Shell and tube heat exchanger, Ansys, Temperature, Heat transfer coefficient, thermal analysis, FEM . Cite this Article: Ram Kishan, Devendra Singh and Ajay Kumar Sharma , CFD Analysis of Heat Exchanger Models Design Using Ansys Fluent . International Journal of Mechanical Engineering and Technology 11(2), 2020, pp. 1-9. http://www.iaeme.com/IJMET/issues.asp?JType=IJMET&VType=11&ITy pe=2 1. INTRODUCTION The sole purpose of the heat exchangers is to enhance the heat transfer between the two fluids. This reduces the energy requirements and helps make the process more efficient . It has been widely admired that the counter flow heat exchanger has a greater heat transfer capability as compare to other heat exchangers. In counter flow heat exchanger the fluid flows inside the Ram Kishan, Devendra Singh and Ajay Kumar Sharma http://www.iaeme.com/ IJMET/index. asp 2 editor@iaeme.com tube and kept apart from each other with a boundary wall where the heat transfers from one fluid to other without mingling. It has great advantage of very compact in size. Heat exchanger is designed and modeled using the correlation based analytical approach which means constantly used to improve the data perio dically. Correlation approach is also applied for the sizing and used for getting better results after successive iteration. Although it is very difficult to get the right combination for the analysis, the CFD makes it easier for the calculation. The trans fer of sensible heat takes place due to the significances of second law of thermodynamics. Different computational analysis has been adopted to analyze and configure the heat exchanger with some altercation like changing the inlet temperatures and mass flo w rates etc. The CFD defines the significance of inlet flow rates to analyze the effectiveness of heat exchanger. Higher temperature difference and mass flow rates makes the counter flow heat exchanger pre -eminent among other heat exchanger. Heat exchanger s are one of the mostly used equipment in the process industries. A heat exchanger is a device in which two liquid streams, one hot and one cold, are carried into thermal contact with each other in order to exchange transfer heat from the hot liquid stream to the cool one. It gives a moderately large surface area of heat exchange for given volume of the equipment. heat exchangers might be characterized based on contacting methods, development, flow arrangement plan or surface compactness. A shell and tube h eat transfer devices are largely demanded in process plants. heat exchangers are one of the generally utilized in the process plant. heat transfer devices are utilized to exchange heat between two types of fluid. One can understand their use that any proce dure which include chilling, heating, condensation, boiling or evaporation will need a heat transfer device for that type of work. Process liquids, typically are warmed or cooled before the procedure or experience a stage change. Several heat exchangers ar e named by their application. For example, heat transfer devices being utilized to condense is called as condensers, also heat exchanger for boiling purpose are called boilers. performance and strength of heat exchangers are studied through the measure of heat transfer utilizing minimum territory of heat exchange and weight drop. Weight drop and region required for a specific measure of heat exchange, gives knowledge about the capital expense and power necessities of a heat exchanger. 2. FLOW ARRANGEMENT There are two essential groupings of heat exchangers as per their stream course of action. In parallel -stream exchangers, the two liquids goes in the exchanger at a parallel end, and moves in parallel to each other to the opposite side. In counter -stream hea t exchangers the liquids enter the exchanger from inverse closures. The counter flow plan is most effective, in that it can exchange the most heat from the heat medium. See countercurrent trade. In a cross -stream heat exchanger, the liquids make a trip gen erally opposite to each other through the exchanger. For effectiveness, warm exchangers are intended to augment the surface territory of the divider between the two liquids, while limiting protection from liquid course through the exchanger. The exchanger' s execution can likewise be influenced by the expansion of blades or creases in one or the two bearings, which increment surface territory and may channel liquid stream or incite disturbance. CFD Analysis of Heat Exchanger Mod els Design Using Ansys Fluent http://www.iaeme.com/ IJMET/index. asp 3 editor@iaeme.com Figure 1 : Shell and Tube Heat Exchanger with one shell pass and one tube pass The main temperature over the heat exchange surface shifts with position, however a proper means temperature can be characterized. In most basic frameworks this is the "log mean temperature difference" (LMTD). In some cases, coordinate information of the LMTD isn't accessible and the NTU strategy is utilized. 3. DESIGN OF HEAT EX CHANGER IN ANSYS To execute the finite element investigation of the heat exchanger models whilst heat exchanger tubes arrangement enhances the temperature and th e heat transfer to the water with the help of tubes, a structural examination performed with the use of ANSYS Workbench V.14.0. At this step the research of the heat exchanger models is a steady state thermal analysis one, while minor modification in heat exchanger models material used aluminum alloy and copper. The model of the heat exchanger models is designed in ANSYS Workbench. Table 1 : Dimensions and material of Solar water heater models Dimensions of Tubes Dimensions of Shell Body Materials Detail Types of Tube Pattern Outer Diameter = 25 mm Length = 1000 mm Tubes Material = Copper Straight Parallel Tube Inner diameter = 22 mm Width = 175 mm Shell Material = Aluminum Alloy ‘S’ pattern Tube Height = 175 mm Zigzag Pattern Tube Fluid used = water Inlet Temperature of Cold water = 12°C Inlet Temperature of Hot water = 90°C Mass flow rate = 0.05 Kg/Sec at Inlet 4. METHODOLOGY As per study it is found that CFD examination includes mainly three types of steps are described: Pre-Processing: This is the beginning stage of the CFD simulation process, which helps to properly explain the geometry. The selected stream domain is divided into a number of smaller components. CFD -GEOM, ANSYS, Meshing, ANSYS, ICEM CFD, T Grid etc. are distinguished pr e-processing programming. Pre -preparation includes the problem, the creation Ram Kishan, Devendra Singh and Ajay Kumar Sharma http://www.iaeme.com/ IJMET/index. asp 4 editor@iaeme.com of a 3D display, the Ansys workbench, meshing and physical working conditions called limits. Solving or Processing: If fluid characteristics, stream physical science have been stu died, then the conditions for handling them with PCs are limited. Extraordinary business programming for this purpose is available: CFD++, Open FOAM, ANSYS CFX, Star CCM, ANSYS FLUENT etc. Using this item, the management requirements for stream science can be understood. Handling involves unwinding numerical or logical fluid stream states until the time when participating is an expert. This usually requires that the PC recognizes a vast number of specifications and can take several hours or several days. Post processing: The last step following the results from the solver is to analyze the results using different technique, such as weight and speed shape tracks, vector track, streamlines, temperature type, etc. after a model is grasped. Post planning is eith er in 2 -D or 3 -D simple representations. 5. ANALYSIS OF HEAT EXC HANGER Shell and tube heat exchangers consist of a series of tubes. One set of these tubes contains the fluid that must be either heated or cooled. The second fluid runs over the tubes that ar e being heated or cooled so that it can either provide the heat or absorb the heat required. A software model is proficient by utilizing amounts of shell and tubes designs in ANSYS 14.0, Workbench structure modeler is utilized to develop Heat exchanger geo metry and for further investigation. Geometry is made simple by offering a leeway for the plane symmetry. This heat exchanger is counter flow type and the tube side consists of one inlet and one outlet representing three types of design of tubes in heat ex changer. After model is designed, run thermal simulation of heat exchanger . The consequences overcome were discreetly studied with general condition. Figures show the three type of variations of tubes design in heat exchanger model in Ansys CFD. Figure 2 : Parallel pipe flow tube heat exchanger CFD Analysis of Heat Exchanger Mod els Design Using Ansys Fluent http://www.iaeme.com/ IJMET/index. asp 5 editor@iaeme.com Figure 3 : S Pattern pipe flow tube heat exchanger Figure 4 : Zigzag pipe flow tube heat exchanger 6. BOUNDARY CONDITIONS Limit conditions are characterized: Inlet – Velocity delta Inlet Outlet – weight outlet (zero -gauge Pressure) Dividers – convective heat exchange, no slip criteria. Liquid Material – Water and Water vapor metal Material – copper and Steel Energy condition – ON Turbulence Model - K-epsilon, feasible, Standard wall treatment demonstrate Solution Method – Second Order Ram Kishan, Devendra Singh and Ajay Kumar Sharma http://www.iaeme.com/ IJMET/index. asp 6 editor@iaeme.com 7. RESULTS AND DISCUSSIONS As per CFD analysis of all three models of heat exchangers with the variations in tubes we found the inlet outlet temperatures. Figure 5 : Parallel pipe flow temp erature Figure 6 : velocity in parallel pipe flow Figure 7 : S Pattern pipe flow temperature Figure 8 : velocity in S Pattern pipe flow Figure 7 : Zigzag Pipe flow temperature Figu re 9: velocity in Zigzag Pattern pipe flow As per study figure shows the variations of temperature difference. In above study three types of heat exchangers designed by using Ansys. Different types of tube used in heat exchanger i.e. Parallel flow tubes, ‘ S’ pattern tubes, and Zigzag flow pattern tubes. After designing cold water inlet temperature given 12 °C and hot water temperature given at inlet is 90°C. as per CFD analysis heat exchange in designed exchanger and results optimized. CFD Analysis of Heat Exchanger Mod els Design Using Ansys Fluent http://www.iaeme.com/ IJMET/index. asp 7 editor@iaeme.com Table 1 : Cold water flow temperatures at inlet and outlet Pattern of Tubes Cold inlet (°C) Cold outlet (°C) Parallel tubes 12 21 ‘S’ Pattern tubes 12 35 Zigzag Pattern tubes 12 54 Table 2 : Hot water Temperatures at inlet and outlet Pattern of Tubes Hot inlet (°C) Hot outlet (°C) Parallel tubes 90 81 ‘S’ pattern tubes 90 80 Zigzag Pattern tubes 90 70 Table 3 : Pressure and velocity at outlets Results Max Pressure (Pa) Max Velocity (m/s) Straight tubes 3.56 6.87 S Pattern tubes 6.54 6.88 Zigzag Pattern Tubes 3.63 6.68 Figure 10 : Cold water temperatures with Patterns of Tube in Heat Exchangers Figure 11 : Hot water temperatures with Patterns of Tube in Heat Exchangers 21 35 54 0102030405060 Parallel pipe flow 'S' Pattern pipe flow Zigzag pipe flowTemperatures in °C Patterns of Tube in Heat Exchangers Cold Water Temperature of Tubes at outlet ( °C) 81 80 70 64666870727476788082 Parallel pipe flow 'S' Pattern pipe flow Zigzag pipe flowTemperatures ( °C) Patterns of Tube in Heat Exchangers Hot water Temperature of Tubes at outlet ( °C) Ram Kishan, Devendra Singh and Ajay Kumar Sharma http://www.iaeme.com/ IJMET/index. asp 8 editor@iaeme.com 8. CONCLUSION From this study we select Copper material to the tubes and steel material to shell design then studied in Ansys and optimized the best possible value of temperature variations amongst the discussed materials. so that it may be assumed that no heat transfer is taking place in between shell and surroundings. As per results it is concluded that Zigzag pattern tube design gives better heat transfer in heat exchanger as comparison to others.  Cold water during Parallel flow tubes give 21°C temp at outlet which is decreases from 12°C.  'S' pattern tubes give 35°C temperature at outlet during cold water flow and Zigzag tube pattern gives 54°C temperature of cold -water flow at outlet.  Hot water during Parallel flow tubes give 81°C temp at outlet which is decreases from 90°C.  In hot water flow 'S' pattern tubes give 80°C temperature at outlet during hot water flow and Zigzag tube pattern gives 70°C temperature of hot -water flow at outlet.  So, after comparing these results we found the maximum heat transfer at Zigzag pattern of heat exchanger. So Zigzag pattern design is optimum design for maximum heat transfer.