| Summary: | 碩士 === 國立臺北科技大學 === 冷凍空調工程系所 === 103 === This study analyzed the air and temperature distribution in closed type server cabinets. The cold and hot aisles concept of data center was applied to closed type server cabinets. Guide vanes and baffles were used to separate the cold and hot air passages and had cold and hot aisles in effects. This new concept was also applied to high power server cabinets. CFD method was used to analyze flow distribution in the server cabinet, so to obtain the flow rates through the servers and the temperatures indicative of server heat dissipation. Height of the lowest server, server arrangement, area ratio of server inlet to cold/hot aisles, etc., was used to analyze the effects on the heat dissipation of servers.
It was found that for better heat dissipation, height of the lowest server would be 90cm and two servers be arranged with no gap in between. Area ratio of server inlet to cold/hot aisles at 15.41 had the best airflow distribution. An indicator of temperature distribution RTI was obtained at 1.17, approaching the optimum 1.0. This closed type server cabinet model was applied to high power servers; with total heat generation rate of 11.2 kW and 14 kW. Seven different cabinet air flow velocities were tested for the inlet and outlet temperatures, respectively for the servers and also the cabinet. It was found that for either total cabinet heat dissipation of 11.2 kW or 14 kW, more balance server inlet temperature was obtained of higher cabinet inlet air velocity. For the 11.2 kW cabinet margin of benefit was 75% higher air flow velocity. In this case the server inlet temperature was 0.51K less than the original design. For the 14 kW cabinet margin of benefit was 100% higher cabinet air flow velocity, and would lower the server inlet temperature by 0.76K.
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