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P M V Subbarao Professor Mechanical Engineering Department I I T Delhi

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Presentation on theme: "P M V Subbarao Professor Mechanical Engineering Department I I T Delhi"— Presentation transcript:

1 P M V Subbarao Professor Mechanical Engineering Department I I T Delhi
Double Pass DPHX P M V Subbarao Professor Mechanical Engineering Department I I T Delhi More New Geometric Ideas : Just for Economy !!!

2 Two inner tubes and one outer tube

3 Variation of Fluid Temperatures
dz

4 Homogenization of Inhomogeneous Equation

5 Still Inhomogeneous ?!?!? What happened on the right side of the line

6

7

8 A True Second Order Homogeneous ODE
Let A homogeneous second order differential equation.

9 The general solution is :
Where A and B are constants and l and m are roots of :

10 Boundary conditions: z

11 Boundary conditions: z

12

13 Size of A Tow Pass DPHX Total Capacity of A Heat Exchanger with of length L:

14

15 Total Capacity of A Heat Exchanger with of length L:

16 Differentiate  wrt z:

17 Z=0

18

19

20 Mean Driving Force for Two Pass DPHX

21

22

23 New Factors  Factor: Ratio of true mean temperature difference to the ITD.

24

25 More Ideas ????

26

27

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