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Step Response of a Single-Pass Crossflow Heat Exchanger With Variable Inlet Temperatures and Mass Flow Rates

[+] Author Affiliations
Karthik Silaipillayarputhur

Kordsa Global, Chattanooga, TN

Stephen A. Idem

Tennessee Tech University, Cookeville, TN

Paper No. IMECE2011-62393, pp. 109-118; 10 pages
doi:10.1115/IMECE2011-62393
From:
  • ASME 2011 International Mechanical Engineering Congress and Exposition
  • Volume 10: Heat and Mass Transport Processes, Parts A and B
  • Denver, Colorado, USA, November 11–17, 2011
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5496-9
  • Copyright © 2011 by ASME

abstract

The step response of a single-pass crossflow heat exchanger with variable inlet temperatures and mass flow rates was determined. In every instance the energy balance equations were solved using an implicit central finite difference method. Numerical predictions were obtained for cases where both the minimum or maximum capacity rate fluids were subjected to step changes in inlet temperature, coupled with step mass flow rate changes of the fluids. Likewise performance calculations were conducted for heat exchangers operating initially at steady state, where step flow rate changes of the minimum and maximum capacity rate fluids were imposed in the absence of any temperature perturbations. Because of the storage of energy in the heat exchanger wall, and finite propagation times associated with the inlet perturbations, the outlet temperatures of both fluids do not respond instantaneously. A parametric study was conducted by varying the dimensionless parameters governing the transient response of the heat exchanger over a representative range of values.

Copyright © 2011 by ASME

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