5 (ch4) - DESIGN AND ANALYSIS OF A FINNED-TUBE HEAT...

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DESIGN AND ANALYSIS OF A FINNED-TUBE HEAT EXCHANGER USING WINGLETS 138 CHAPTER 4 RESULTS AND CONCLUSIONS 4.1 Calculations Procedure : 4.1.1 Capacity Ratio : Capacity ratio is a dimensionless quantity defined as (Eq. 4.1) Where is the product of mass flow rate and specific heat at constant pressure . We know that heat transferred from water is, essentially, equal to the heat transferred to air. That is , (Eq. 4.2) Which gives Which means that (Eq. 4.3) 4.1.2 Effectiveness : Effectiveness is the ratio of the temperature difference between inlet and outlet of the fluid with the least heat capacity rate to the maximum available temperature difference. That is, (Eq. 4.4) 4.1.3 Fan Power : Fan power is calculated through the relation is measured using the u-tube manometer. is measured from the relation .
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DESIGN AND ANALYSIS OF A FINNED-TUBE HEAT EXCHANGER USING WINGLETS 139 4.2 Results : 4.2.1 Case of Constant Water Flow Rate : 4.2.1.1 Constant Water Flow Rate at 5 : (a) at 80 water inlet : Without winglets (plain fins) : with delta-winglets fins : With delta-winglets fins :
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DESIGN AND ANALYSIS OF A FINNED-TUBE HEAT EXCHANGER USING WINGLETS 140 (b) at 70 water inlet : Without winglets Figure 4.1 : effectiveness variation with air flow rate change, for 90 ,45 delta-winglet and plain fins at 80 .
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DESIGN AND ANALYSIS OF A FINNED-TUBE HEAT EXCHANGER USING WINGLETS 141 With 90 winglets Figure 4.2 : effectivness variation with air flow rate change, for 90°,45° delta-winglet and plain fins at 70 .
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DESIGN AND ANALYSIS OF A FINNED-TUBE HEAT EXCHANGER USING WINGLETS 142 With 45 winglets (c) at 60 water inlet : Without winglets With 90° winglets
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DESIGN AND ANALYSIS OF A FINNED-TUBE HEAT EXCHANGER USING WINGLETS 143 With 45° winglets Figure 4.3 : effectivness variation with air flow rate change, for 90°,45° delta-winglet and plain fins at 60 .
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DESIGN AND ANALYSIS OF A FINNED-TUBE HEAT EXCHANGER USING WINGLETS 144 (d) at 50 water inlet : Without winglets With 90 winglets With 45° winglets
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DESIGN AND ANALYSIS OF A FINNED-TUBE HEAT EXCHANGER USING WINGLETS 145 Figure 4.4 : effectivness variation with air flow rate change, for 90°,45° delta-winglet and plain fins at 50 .
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DESIGN AND ANALYSIS OF A FINNED-TUBE HEAT EXCHANGER USING WINGLETS 146 Figure 4.5 : fan power at different flow rates of air for different types of fins for 5 l/min water flow.
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DESIGN AND ANALYSIS OF A FINNED-TUBE HEAT EXCHANGER USING WINGLETS 147 Figure 4.7 : variation of effectiveness of
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