Temperature Profiles in Heat Exchangers

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Presentation transcript:

Temperature Profiles in Heat Exchangers P M V Subbarao Professor Mechanical Engineering Department I I T Delhi A Physics based Mean Temperature Difference?!?!?!

Heat Transfer in an infinitesimal HX Thermodynamics & Heat Transfer Analysis of Infinitesimal Heat Exchanger Heat Transfer in an infinitesimal HX

Synergism between HT & TD:

For A finite HX:

For A finite HX:

Parallel flow configuration

Counter flow configuration

Capacity of A Finite Simple Heat Exchanger A representative temperature difference for heat communication:

Discussion on LMTD This LMTD is valid of simple tube in tube HXs only. LMTD can be easily calculated, when the fluid inlet temperatures are know and the outlet temperatures are specified. Lower the value of LMTD, higher the value of overall value of UA. For given end conditions, counter flow gives higher value of LMTD when compared to co flow. Counter flow generates more temperature driving force with same entropy generation. This nearly equal to mean of many local values of DT.

Counter flow generates more temperature driving force with same entropy generation.

LMTD is nearly equal to mean of many local values of DT

The Problem of Sizing of A Heat Exchanger

The Problem of Finding Capacity