Experimental evaluation of R22 and R407C evaporative heat transfer coefficients in a vapour compression plant

被引：37

作者：

Aprea, C

de Rossi, F

Greco, A

机构：

[1] Univ Naples Federico II, DETEC, I-80125 Naples, Italy

[2] Univ Sannio, Fac Ingn, Benevento, Italy

[3] Univ Salerno, Dipartimento Ingn Meccan, I-84084 Salerno, Italy

来源：

INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID | 2000年 / 23卷 / 05期

关键词：

heat transfer; mass transfer; evaporation; horizontal tube; counterflow; ring tube; R22; R407C;

D O I：

10.1016/S0140-7007(99)00068-7

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The mean heat transfer coefficients of R22 and R407C in the coaxial counterflow evaporator (20 mm ID) of a refrigerating vapour compression plant have been experimentally measured. The experimental conditions under which heat transfer coefficients were determined reflect a typical working situation for small-scale refrigeration systems. The heat flux ranged from 1.9 to 9.1 kW/m(2) and the mass flux was varied from 30 to 140 kg/m(2) s. The results illustrate that the R22 heat transfer coefficient is always greater than that of R407C. Furthermore, a comparison carried out between the experimental data and those predicted by means of the most credited literature relationships showed a strongly overprediction for R407C coefficients. (C) 2000 Elsevier Science Ltd and IIR. All rights reserved.

引用

页码：366 / 377

页数：12

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