Modification of Capacity Ratio in Simple HXs

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Presentation transcript:

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….

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

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

Temperature Variation

Analysis of HX1

Analysis of HX2

Analysis of Global ASTP HX

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

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

Mean Temperature of Global ASTP

For two level ASTP For n level ASTP

Two level Annular flow in series & Tubular Flow in Parallel

n level Annular flow in series & Tubular Flow in Parallel

For simple counter flow heat exchanger: For n level ASTP

n F Pavg

Comparison