Design Techniques for R-717, R-22, and R-12 Shell-and-Coil Subcoolers and Intercoolers

نویسنده

  • Z. H. Ayub
چکیده

Subcoolers and 1nter<:oolers are becc:ming essential pa rt of any refrigeration system. The most canmon type f:ound in industrial ·refrigeration is the Shell-and-Coil config Llration. This paper presents a design technique for s1.z..i.ng of coils for Ammonia, R-22, and R-12 systems. The e"aluation of i nside .<;tnd outside heat transfer coefficients is based on well e stablished correlations and canpL!ter programs. CorrelatJ.ons are also presented for pressure drop Bvaluation. ThB derived correlations s.re vali'"refroidisseurs et Ies refroidisseurs inter mediaires sont devenus une partie essentielle de tout systeme frigorifique. Le type le plus courant dans le froid industricl est le type multitubuJaire. Cettc communica tion presente une technique de conception pour le dimens:onncment des serpcntins des > ysteme• a ammoniac, R22 et R12. L'evaluation des coefficients de transfert de chaleu r interne et externe se fonde SUl' des correlations bien etablies et des programmes d'ordin ateur. On presente aussi des correlations pour )'evaluation de Ia chute de pression. Les co rrelations etablies sont valables pour des temperatures de18 a so•c.

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تاریخ انتشار 2014