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Comparaison des caractéristiques d'absorption du R134a par le DMAC et le DMF, dans un absorbeur à film tombant à tube horizontal.

Comparing absorption characteristics of R134a into DMAC and DMF for a falling film horizontal tube absorber.

Numéro : pap. ID: 364

Auteurs : YADA K. K., HARIKRISHNAN L., TIWARI S., et al.

Résumé

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 authors have investigated the heat and mass transfer characteristics for absorption of R134a into DMF for a falling film horizontal tubular absorber 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 condition 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.

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Pages : 8 p.

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Détails

  • Titre original : Comparing absorption characteristics of R134a into DMAC and DMF for a falling film horizontal tube absorber.
  • Identifiant de la fiche : 30002726
  • Langues : Anglais
  • Source : Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Date d'édition : 21/08/2011

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