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Flow fields in shell-and-tube condensers: comparison of a pure refrigerant and a binary mixture

Tord Karlsson (Extern ; Institutionen för energi och miljö, Värmeteknik och maskinlära) ; Lennart Vamling (Institutionen för energi och miljö, Värmeteknik och maskinlära)
International Journal of Refrigeration-Revue Internationale Du Froid Vol. 28 (2005), 5, p. 706-713.
[Artikel, refereegranskad vetenskaplig]

Detailed 2D CFD calculations for vapour flow field and rate of condensation are carried out for a geometry similar to a real shell-and-tube condenser with 100 tubes, with condensation on the shell-side. The differences in vapour flow behaviour are investigated for pure R22 and for a binary mixture of R32 and R134a, which has a gliding temperature difference of 5.5 K. It is shown that, the flow field for a zeotropic mixture is significantly different from that for a pure fluid. The nature of the mixture flow causes the vapour and condensate to flow counter-currently in part of the condenser. Adjustments of the inlet design turn out to influence the rate of heat transfer by up to 24% for the conditions tested, with greater influence on heat transfer for lower driving forces.

Nyckelord: Condenser; Flow; Refrigerant; Vapour; Comparison; R22; Zeotropic mixture; R32; R134a

Denna post skapades 2006-08-25. Senast ändrad 2015-02-11.
CPL Pubid: 9617


Institutioner (Chalmers)

Institutionen för energi och miljö, Värmeteknik och maskinlära (2005-2014)


Termisk energiteknik
Kemisk energiteknik

Chalmers infrastruktur