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Modification of Capacity Ratio in Simple HXs

Published byJarmo Haapasalo Modified over 5 years ago

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Presentation on theme: "Modification of Capacity Ratio in Simple HXs"— Presentation transcript:

1 Modification of Capacity Ratio in Simple HXs
P M V Subbarao Professor Mechanical Engineering Department I I T Delhi Split the flows for better Perfromance….

2

3 Annular flow in series & Tubular Flow in Parallel
Counter Flow HX- HX- Tubular stream mass flow is equally split between the two units.

4 Flow Parameters Annular flow: Hot Fluid & Tubular flow : Cold Fluid.
HX 1 HX 2 Hot fluid inlet temperature Th,in1 Th,in2 Hot fluid outlet temperature Th,ex1 Th,ex2 Cold fluid inlet temperature Tc,in1 Tc,in2 Cold fluid outlet temperature Tc,ex1 Tc,ex2 Hot fluid flow rate Cold fluid flow rate Surface area A/2

5 Temperature Variation

6 Analysis of HX1

7 Analysis of HX2

8 Analysis of Global ASTP HX

9 New Dimensionless Parameters
For same value of U in both the HXs Cold (Tubular) stream in parallel: Hot (annular) stream in series:

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11 For simple counter flow heat exchanger:
For HX1 of ASTP: For HX2 of ASTP:

12 Mean Temperature of Global ASTP

13 For two level ASTP For n level ASTP

14 Two level Annular flow in series & Tubular Flow in Parallel

15 n level Annular flow in series & Tubular Flow in Parallel

16 For simple counter flow heat exchanger:
For n level ASTP

17

18 n F Pavg

19

20

21

22

23 Comparison

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