Flow-boiling of R22, R134a, R507, R404A and R410A inside a smooth horizontal tube |
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Authors: | A. Greco G.P. Vanoli |
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Affiliation: | aFacoltà di Ingegneria, DETEC, Università degli Studi di Napoli Federico II, Pzle Tecchio 80, 80125 Napoli, Italy;bFacoltà di Ingegneria, Università del Sannio, Palazzo Bosco Lucarelli, Piazza Roma, Benevento, Italy |
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Abstract: | Flow boiling heat transfer coefficients of R22, R134a, R507, R404A and R410A inside a smooth horizontal tube (6 mm I.D., 6 m length) were measured at a refrigerant mass flux of about 360 kg/m2 s varying the evaporating pressure within the range 3–12 bar, with heat fluxes within the range 11–21 kW/m2. The experimental data are discussed in terms of the heat transfer coefficients as a function of the vapour quality. The experimental results clearly show that the heat transfer coefficients of R134a are always higher than those pertaining to R22 (from a minimum of +6 to a maximum of +45%). |
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Keywords: | Experiment Boiling Horizontal tube R22 R134a R507 R404A R410A Heat transfer coefficientMots clé s: Experimentation É bullition Tube horizontal R22 R134a R507 R404A R410A Coefficient de transfert de chaleur |
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