5 (ch4)

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

• Essay
• 43

This preview shows page 1 - 11 out of 43 pages.

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 .

Subscribe to view the full document.

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 :
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 .

Subscribe to view the full document.

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 .
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

Subscribe to view the full document.

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 .
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

Subscribe to view the full document.

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 .
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.

Subscribe to view the full document.

DESIGN AND ANALYSIS OF A FINNED-TUBE HEAT EXCHANGER USING WINGLETS 147 Figure 4.7 : variation of effectiveness of

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern