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

被引：36
|
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.
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页码：366 / 377
页数：12
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