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A Transient Model for Parallel Flow and Counter Flow Heat Exchangers

[+] Author Affiliations
K. Abbasi, M. Del Valle, A. P. Wemhoff, A. Ortega

Villanova University, Villanova, PA

Paper No. IPACK2013-73118, pp. V001T04A008; 10 pages
doi:10.1115/IPACK2013-73118
From:
  • ASME 2013 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems
  • Volume 1: Advanced Packaging; Emerging Technologies; Modeling and Simulation; Multi-Physics Based Reliability; MEMS and NEMS; Materials and Processes
  • Burlingame, California, USA, July 16–18, 2013
  • Conference Sponsors: Electronic and Photonic Packaging Division
  • ISBN: 978-0-7918-5575-1
  • Copyright © 2013 by ASME

abstract

The transient and steady-state response of single pass constant-flow (concentric parallel flow, concentric counter flow) heat exchangers was investigated using a finite volume method. Heat exchanger transients initiated by both step-change and sinusoidally varying hot stream inlet temperatures were investigated. The wall separating the fluid streams was modeled by conduction with thermal mass; hence the heat exchanger transient behavior is dependent on the thermal mass of the fluid streams as well as the internal wall. The outer wall is approximated as fully insulating. The time dependent temperature profiles were investigated as a function of heat exchanger dimensionless length and dimensionless time for both fluids. It was found that the transient response of the heat exchanger is controlled by a combination of the residence time and thermal capacitance of the fluid streams, the overall heat transfer coefficient between the fluid streams, and the thermal capacitance of the internal wall.

Copyright © 2013 by ASME

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