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Comparison of Heat and Mass Transfer Characteristics of Absorption of R134a in DMAC and DMF for a Falling Film Horizontal Tube Absorber

[+] Author Affiliations
Kamal Kant Yadu, Shaligram Tiwari, Prakash Maiya Manoor

Indian Institute of Technology Madras, Chennai, Tamil Nadu, India

Paper No. IMECE2014-37221, pp. V08AT10A072; 8 pages
doi:10.1115/IMECE2014-37221
From:
  • ASME 2014 International Mechanical Engineering Congress and Exposition
  • Volume 8A: Heat Transfer and Thermal Engineering
  • Montreal, Quebec, Canada, November 14–20, 2014
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4955-2
  • Copyright © 2014 by ASME

abstract

The present work is a comparative study of heat and mass transfer behaviour during the absorption of R134a (1, 1, 1, 2 Tetrafluroethane) vapour into absorbents, DMAC (N, N-Dimethylacetamide) and DMF (N, N-Dimethylformamide). Initially, the heat and mass transfer characteristics for absorption of R134a into DMF for a falling film horizontal tubular absorber have been investigated by employing a two-dimensional numerical technique. The related governing equations are solved using a developed computer code in MATLAB. Then, a comparison of absorption characteristics of R134a-DMAC and R134a-DMF is made. For the mean value of operating parameters considered, the R134a-DMF solution absorbs more due to higher diffusion coefficient value of DMF than DMAC. The mass transfer coefficient is observed to decrease at a steeper rate at the entrance of the first tube for both working fluids, after which gradual decrease in the mass transfer coefficient is observed further downstream.

Copyright © 2014 by ASME

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