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ISSN 打印: 1065-5131

ISSN 在线: 1563-5074

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 2.3 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 1.8 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.2 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00037 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.6 SJR: 0.433 SNIP: 0.593 CiteScore™:: 4.3 H-Index: 35

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

卷 6, 册 2-4, 1999, pp. 317-326
DOI: 10.1615/JEnhHeatTransf.v6.i2-4.170
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摘要

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.

对本文的引用
  1. Lee D.-Y, Ahn Y, Kim Y, Kim Y, Chang Y.-S, Nam L, Experimental investigation on the drop-in performance of R407C as a substitute for R22 in a screw chiller with shell-and-tube heat exchangers, International Journal of Refrigeration, 25, 5, 2002. Crossref

  2. Chamra L M, Mago P J, Tan M-O, Kung C-C, Modelling of evaporation and condensation pressure drop in microfin tubes, Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 219, 1, 2005. Crossref

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