4 (ch3) - DESIGN AND ANALYSIS OF A FINNED-TUBE HEAT...

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DESIGN AND ANALYSIS OF A FINNED-TUBE HEAT EXCHANGER USING WINGLETS 126 CH3 EXPERIMENTAL SET-UP The test of performance of tube-fin heat exchangers, and the effect of enhancements applied to its airside require a special experimental set-up . In this chapter, a brief description of the instruments and measurements devices used in our experimentation is presented. This is achieved through pronouncing figures followed by explanations. 3.1 Test Rig : Heating systems with finned tubes used in practice are usually liquid/gas heat exchangers. Therefore, we manufactured an experimental set - up inside of which water is carried, and outside of which air passes. Air flow rate is expected to have great effect on the degree of benefiting from delta-winglets. Also, hot fluid temperature greatly affects air flow variables including boundary layer shape. In this project, effect of these parameters variations on the performance of delta-winglets in a tube-fin heat exchanger will be measured. Figures 3.1, 3.2, and 3.3 show the test rig used for this purpose from three views. Figure 3.4 shows a layout of the test rig. Figure 3.1 : horizontal view from frontside of the test rig.
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DESIGN AND ANALYSIS OF A FINNED-TUBE HEAT EXCHANGER USING WINGLETS 127 Figure 3.2 : a side view of the test rig with heat exchanger unit uncovered. Figure 3.3 : a horizontal view the backside of the test rig.
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DESIGN AND ANALYSIS OF A FINNED-TUBE HEAT EXCHANGER USING WINGLETS 128 In figure 3.4, numbers laid out on the picture denotes different parts of the test rig as follows : 1- air fan. 12- water heater. 2- air flow gate controller. 13- water pump. 3- air flowmeter. 14- thermocouple. 4- thermocouple. 15- water u-tube manometer. 5- fins superimposed on tubes. 16- air u-tube manometer. 6- water tubes. 7- thermocouple. 8- thermocouple. 9- water flowmeter. 10- water flowmeter. 11- tank. Figure 3.4 : a layout of the test rig.
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DESIGN AND ANALYSIS OF A FINNED-TUBE HEAT EXCHANGER USING WINGLETS 129 3.1.1 Air Fan : An electrical air fan is used to pump water in the air flow loop. It is of the centrifugal type, and has a maximum flow rate of 14 . The fan is shown in figure 3. 5.
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