19, Table 19: LMTD of Shell and Tube heat exchanger. All the points are explained clearly and understandable about the working procedure of heat exchanger. Parallel flow exists when two fluids flow in parallel directions. 5, 2.3.1          Total heat loosed and energy gained. 18, Table 17: LMTD of Aluminum double pipe heat exchanger (Parallel Flow). The variables that affect the performance of a heat exchanger are the fluids’ physical properties, the fluids’ mass flow rates, the inlet temperature of the fluids, the physical properties of the heat exchanger materials, the configuration and area of the heat transfer surfaces, the extent of scale or deposits on the heat transfer surfaces, and the ambient conditions. Conduction is a mode of heat transfer in which the heat is moving through a stationary object or fluid. 5G��j#��/�zf�X�le)[Y[X���/�ѷ^/5�q��g�>V$� T�z���&�,0qE��*�8�Mf�s�8Z���G>����l��c�3�`�����N�ϓ���+� ���y The simplest form is composed of straight sections of tubing encased within the outer shell, however alternatives such as corrugated or curved tubing conserve space while maximising heat transfer area per unit volume. The main objective for this experiment is to demonstrate the effect of the flow rate variation on the performance characteristics of a counter-flow and parallel flow concentric tube heat exchanger. 500 words, in a text box if using Excel) comparing your results and suggestions for further study. For a heat exchanger that flows parallel or counter current then the coefficient of heat transfer is called the overall coefficient of heat transfer. :-P And, if you are posting at other online social sites, I would like to keep up with everything fresh you have to post. 7, Figure 5: cross-flow heat exchanger (unmixed). �xʦ�>���?�����:�� k�ǤJ1��]C�(Ps��u�ʍ(+�(��l2l���p#J�@��^+�Xx 15, Table 11: Heat Loss and Heat Gain for aluminum double pipe heat exchanger parallel flow of hot water  16, Table 12: Heat Loss and Heat Gain for aluminum double pipe heat exchanger counter flow of hot water  17, Table 13: Heat Loss and Heat Gain for copper double pipe heat exchanger parallel flow of hot water. 6, 2.3.2          Log Mean Temperature Difference. Depending on direction of working media-fluid flow the heat exchanger is either parallel (concurrent) flow heat exchanger or counter flow heat exchanger (see Figures below). If any equipment fails in the experiment report it to the supervisor immediately. Experiment regarding heat exchanger- concurrent/countercurrent flows at same rate and different rates. Prepared by: Ahmed Alrahmani Prepared to: Dr. Maohong Fan Subject: Heat Transfer from Steam to Water Date: 11/01/2013 Summary: The objective of this experiment was to investigate the overall heat transfer ( Uₒ ) for the external heat exchanger at two different water circulation rates by using two methods “ Heating Liquids in Tank Storage ” and “ Corning Heat Exchanger “ . 20, 2.6.5          Types of Heat Exchangers. 8, 2.5         Experimental data analysis. mizisystem.blogspot.com. Because the cooler fluid exits the counter flow heat exchanger at the end where the hot fluid enters the heat exchanger, the cooler fluid will approach the inlet temperature of the hot fluid. Computation: Use MATLAB or MS Excel and calculate the LMTD and Heat Exchanger effectiveness values for the 3 tests. Could it be simply me or does it look like a few of these responses appear as if they are written by brain dead people? There are significant disadvantages however, the two most noticeable being their high cost in proportion to heat transfer area; and the impractical lengths required for high heat duties. Counter flow exists when the two fluids flow in opposite directions. Hence, the counter-current flow is much more efficiency than co-current flow. 17, Table 15: Heat Loss and Heat Gain for shell and tube heat exchanger of hot water. 20, Figure 2:  Parallel flow and Counter flow in the heat exchanger. Six temperature reading was recorded in the result table. This is achieved by swapping the cold pipes around so that both cold inlet and hot outlet are on the same side. 13, Figure 9: Temperature profile for aluminum double pipe counter at full flow rate. Course : Chemical Engineering … 5. 4, 2.2.1          Parallel flow procedure. After completing the procedure for parallel flow. 17, Table 16: Heat Loss and Heat Gain for cross flow heat exchanger of hot water. Furthermore Q, heat transferred between the hot water and cold water can be calculated as follows: where F is the correction factor which equals 1 for this SIMLAB (it takes values between 0.5 and 1). 7, Figure 4: One-shell pass and one-tube pass. Student should wear college ID-card and must carry record and observation. 4 2.2 Experimental procedure. 20, Table 22: LMTD of Aluminum double pipe heat exchanger (Counter Flow). (xH�P8�� �5�奅�.�(�p#dC���$� CI j�����s0Txk.j,��=�Y����-�T��#�,�sY�d�� E�cӲ�Wm��*mb7��e�*q���N�Aܦ|����}�]���(V�d��l7eޓ4��K�SU��&=m��xӶ�ۗ��:�Y���8_���U1�e�dwg=�����Ɯ��ߍf_�R�ڛ��P��4?��_�>>s쟚s�F?�����. In the counter flow exchanger, the fluids flow in parallel but opposite directions. 7, 2.3.3          Heat transfer coefficients (U). And I do have 2 questions for you if you don't mind. 17, Table 14: Heat Loss and Heat Gain for copper double pipe heat exchanger counter flow of hot water. 15, Figure 12: All cases of Heat Losses and Heat Gains at different flow rates. 5 2.2.1 […] iv 1 Introduction. The main function of heat exchanger is to either remove heat from a hot working media or to add heat to the cold working media. The way that a heat exchanger works is hot water and cold water entering the exchanger, where the process of cold water gaining some heat and the hot water losing some takes place, before they both exit the exchanger. 1.0.Introduction The heat exchanger is a device in which as the name refers, exchange of heat occurs between two fluids (gases or liquids) that come in and leave at varied temperature levels. Set up heat exchanger for counter flow distribution. In the counter flow heat exchanger, fluids enter at opposite ends and therefore at different ends of the temperature scale Figure 2. 6, Figure 3: One-shell pass and two-tube passes. This step was repeated for the volumetric flow rate of 2,000, 3,000, and 4,000 cm3/min. ii List of Figures. Heat and Mass Transfer (A Practical Approach) – 3rd Edition, Yunus A. Cengel, McGraw Hill (2006). 22, Table 28: Aluminum Double Pipe Heat Exchanger Counter Flow Heat Transfer Coefficients. 13, Table 6: Experiment results of aluminium double pipe heat exchanger (counter flow). 20, 2.6.3          Entropy and its impact on efficiency. Developing a set of experiments to obtain statistically significant trends for the overall heat transfer coefficient and the inside heat transfer coefficient as a function of water velocity. 14, Table 8 Experiment results of copper double pipe heat exchanger (counter flow). 19, Table 18: LMTD of Copper double pipe heat exchanger (Parallel Flow). Shell-and-tube type heat exchanger having (a) 0°, (b) 30°, and (c) 60° baffle angles. Take signature of lab in charge after completion of observation and record. Concentrıc tube heat exchanger demonstrates the basıc prıncıples of heat transfer. http://www.concentrictubeheatexchanger.com/, http://en.wikipedia.org/wiki/Concentric_tube_heat_exchanger, dialog antara manusia, malaikat dan syaitan, lelaki yang ditarik wanita masuk ke neraka, 15 perkara yang dilakukan akan mengundang bala. 9, Figure 7: calculating ∆T1 and ∆T2 for parallel flow and counter. In a parallel-flow heat exchanger, the working fluids flow in the same direction. 1, 2.1.1          Double pipe heat exchanger. 23, Table 1: Properties of double pipe of Aluminium and Copper in heat exchanger. Powered by. The overall resistances can be calculated using: Heat transfer coefficients ah and ac can be calculated using the following expression for Nusselt number for hot and cold water: And the LMTD is given by the following correlation where 1 and 2 presents the ends of the heat exchanger: Recall from the Boiler Efficiency Lab that efficiency is to do with minimizing waste and effectiveness to do with maximizing output. The preference is to pass the hot fluid through the inner tube to reduce heat losses, while the annulus is reserved for the high viscosity stream to limit the pressure drop. Conclusion: Write a summary (max. Heat Exchanger. Additionally, their robust build means that they can withstand high pressure operations. Step 2 to 7 is repeated for counter-flow heat exchanger operation. 3 2.1.3 Cross flow heat exchanger. %PDF-1.6 %���� Calculations on the heat transfer and heat loss were carried out for energy balance study.

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