Open AccessThermodynamic Analysis of Efficiency- NTU Parameters for Parallel Flow Type Heat Exchanger under the Effect of External Heat Leak
Author(s) -
Roopesh Tiwari
Publication year - 2018
Publication title -
asian journal of engineering and applied technology
Language(s) - English
Resource type - Journals
ISSN - 2249-068X
DOI - 10.51983/ajeat-2018.7.1.975
Subject(s) - ntu method , thermodynamics , heat exchanger , leak , plate heat exchanger , heat capacity rate , work (physics) , plate fin heat exchanger , mechanics , micro heat exchanger , materials science , heat spreader , flow (mathematics) , physics
The work presented here analyses theoretically a parallel flow type heat exchanger which is subjected to external heat leak, from the cold fluid side or from the hot fluid side. Efficiency-NTU relations are developed and the results obtained are presented graphically, reflecting the effect of heat capacity ratios and the heat leak on the efficiency of the heat exchanger. The graphs follow the similar pattern with increasing heat capacity ratios. Also, as the heat leak is increased, the graphs show opposite behavior when the minimum heat capacity is on the hot side to that when the minimum capacity is on the cold side. The derived expressions are reduced to the classical effectiveness-efficiency-NTU relations for the parallel flow type heat exchangers as the heat leak approaches zero.