کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4915670 1428084 2017 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Three typical operating states of an R744 two-phase thermosyphon loop
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی مهندسی انرژی و فناوری های برق
پیش نمایش صفحه اول مقاله
Three typical operating states of an R744 two-phase thermosyphon loop
چکیده انگلیسی
As the two-phase thermosyphon loop (TPTL) gets more extensive application in data centers, problems have been encountered. One of the most common problems is undesirable overheating or subcooling during the operation of the TPTL. The overheating or subcooling results from abnormal operating states. Herein, an experiment conducted on an R744-based TPTL is described. The TPTL experienced a prestart operating state, an oscillatory operating state, and a stable operating state successively as the heat transfer quantity increased. In the prestart operating state, no regular circulation was formed in the loop, and overheating was usually measured in the top part of the riser. In the oscillatory operating state, the mass flow rate, temperature, and pressure all exhibited periodical variation with an identical period. In the stable operating state, the TPTL functioned well until the heat transfer quantity exceeded the maximum heat transfer ability of the TPTL. The stable operating state was divided into the normal operating state and the overload operating state, and the normal operating state is the goal to strive for in practical application. In the experiment, at the same fill ratio of 100%, the reasonable heat load ranges for normal operating of the TPTL were 650-1400 W, 1400-3300 W, and 2000-5400 W for diameters of 6, 9, and 12 mm, respectively. Higher heat load demanded for larger diameter.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Energy - Volume 206, 15 November 2017, Pages 181-192
نویسندگان
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