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dc.contributor.authorSulaiman, Mohammed W.en_US
dc.contributor.authorDaraghmeh, Hafiz M.en_US
dc.contributor.authorWang, Chi-Chuanen_US
dc.date.accessioned2020-10-05T01:59:51Z-
dc.date.available2020-10-05T01:59:51Z-
dc.date.issued2020-07-01en_US
dc.identifier.issn1388-6150en_US
dc.identifier.urihttp://dx.doi.org/10.1007/s10973-020-09499-wen_US
dc.identifier.urihttp://hdl.handle.net/11536/154991-
dc.description.abstractThis study aims to experimentally examine the energy-saving potential by using R-134a filled separated two-phase thermosiphon loop (STPTL) for data center applications. A parametric study had been made to compare the energy consumption of two data center racks. Two fin-and-tube heat exchangers were attached to one of the racks to form two individual thermosiphon loops. The experiments were carried out subject to different operating conditions, including three ambient temperatures (20 degrees C, 23 degrees C, and 27 degrees C) and filling ratios ranging from 30 to 90% in association with heating loads ranging between 1.5 kW and 6 kW. Parametric influences regarding concentrated heat loading or uniform heat loading are studied. It was found that an appreciable energy-savings can be obtained at high filling ratios and a maximum of 49% energy-saving with the assistance of thermosiphon is observed. Accordingly, the rising of system pressure will result in noticeable savings. Relative to the uniform heat loading of the data rack, the thermosiphon shows even more energy-saving potential in concentrated heat loading. This phenomenon is more pronounced at a lower ambient temperature like 20 degrees C. On the other hand, there is no appreciable energy-saving for the thermosiphon between concentrated and uniform heating loads when the ambient temperature is high (27 degrees C). Furthermore, the influence of airflow rate was also investigated under various ambient temperatures with a 90% filling ratio and a heating load of 6 kW. The results revealed that the lower airflow rate in the thermosiphon yields comparatively better energy-saving than the higher flow rate. The study on the influence of using two STPTLs indicated that 15-23% energy-saving can be achieved at a 90% filling ratio and 6 kW heating load for all the studied ambient conditions if compared with testing each loop separately. Lower thermal resistance is seen at the higher filling ratios, ambient temperatures, and heating loads.en_US
dc.language.isoen_USen_US
dc.subjectData centeren_US
dc.subjectFree coolingen_US
dc.subjectEnergy-savingen_US
dc.subjectVariable heating loadsen_US
dc.subjectThermosiphonen_US
dc.subjectSeparated loopen_US
dc.titleEnergy-saving potential of separated two-phase thermosiphon loops for data center coolingen_US
dc.typeArticleen_US
dc.identifier.doi10.1007/s10973-020-09499-wen_US
dc.identifier.journalJOURNAL OF THERMAL ANALYSIS AND CALORIMETRYen_US
dc.citation.volume141en_US
dc.citation.issue1en_US
dc.citation.spage245en_US
dc.citation.epage265en_US
dc.contributor.department機械工程學系zh_TW
dc.contributor.departmentDepartment of Mechanical Engineeringen_US
dc.identifier.wosnumberWOS:000540244500022en_US
dc.citation.woscount0en_US
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