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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Journal of Enhanced Heat Transfer
Импакт фактор: 0.562 5-летний Импакт фактор: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN Печать: 1065-5131
ISSN Онлайн: 1026-5511

Выпуски:
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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v6.i2-4.170
pages 317-326

In-tube Evaporation of R-22 and Three of its Alternatives in a 15.88 mm Internally Enhanced Tube

James Bogart
Wolverine Tube, Inc., 2100 Market Street N.E., Decatur, Alabama 35602, USA
Petur Thors
Wolverine Tube, Inc., 2100 Market Street N.E., Decatur, Alabama 35602, USA

Краткое описание

In-tube evaporation heat transfer and pressure drop comparisons were performed with R-22 and three of its HFC alternatives, R-134a, R-407C, and R-507, with a commercially available 15.88 mm internally enhanced tube − 75 internal ridges with 0.305 mm (0.012") ridge height and a helix angle of 23° (Turbo-DX®-75 ridge as manufactured by Wolverine Tube, Inc.). The experiments were performed over an appropriate mass flux range − 25−275 kg/s-m2 (R-407C was tested from 25−170 kg/s-m2 ) - to ensure that the data were applicable for many uses. The R-22 evaporation data for this tube from Thors and Bogart (1994) is reprinted here for comparison purposes and the balance of the data presented are new. The data indicate that R-22 has the highest evaporation coefficient of all of the refrigerants. The results also show that R-507 has a considerably lower pressure drop than the other three refrigerants.