The Research and Development of In-Row Cooling System with The Pumped Refrigerant Cycle for Data Centers

• Main Authors: Dun-RongYang, 楊敦榮
• Other Authors: Jiin-Yuh Jang
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/95143909570190685205

碩士 === 國立成功大學 === 機械工程學系碩博士班 === 101 === The method of data center cooling is divided into (1) chilled water cooling system (2) direct expansion refrigerant cycle system (3) pumped refrigerant cycle system. Chilled water cooling system is using chilled water as the working fluid, but it has the risk of leakage chilled water. In direct expansion refrigerant cycle system, compressor shall be placed into standard cabinet will take up part of the space so that the placement of the cooling coil shrink, thus cooling capacity is low, and the refrigerant pressure is high. Pumped refrigerant cycle system without using compressors can retain a large space to place a larger cooling coil in the same cabinet size and can prevent water leakage risk. The first part of this thesis is developing a pumped refrigerant cycle system, the working fluid using R134a in the tube side. According to the theory of heat exchanger design cooling coil that cooling capacity of 30kW (evaporator), using the plate-fin and tube heat exchanger that the length, width, height and heat transfer area of the heat exchanger is 250 mm, 54.6mm, 1722mm, 28.56 m2. Using thermodynamic theory analysis system to calculate the coefficient of performance (COP) is 5.77, and the completion of the relevant component size design. Finally, we set up the prototype of the pumped refrigerant cycle system. The second part of the thesis is that data centers in-row cooling system analysis by computational fluid dynamics (CFD). In data centers, the space of cooling unit blowing cold air is called cold aisle and the space of server exhaust hot air called hot aisle. This study considers a single aisle module size of length, width, height is 10000 mm, 4820 mm, 3440 mm, and the room placed two rows cabinet and cooling units, a row of nine cooling units (cooling capacity 30kW / cooling unit) and 10 servers (power 27kW/ servers). Hot aisle is located in the central room, and the cold aisle is located in the room on both sides. Fixed the sum of cold and hot aisle size is 3000 mm, changing the hot aisle size range from 800mm to 2600mm to investigate the effect of cooling capacity with ten different combination of hot and cold aisle size and then using Rack Cooling Index (RCI) assess the cooling effect. The results indicates that when the size of hot aisle is less than 1800 mm, the greater hot aisle size, the greater the value of RCI. When the size of hot aisle is larger than 1800 mm, the greater hot aisle size, the smaller the value of RCI. When the hot aisle size is 1800 mm and cold aisle size is 600 mm, the value of RCI is 100% that the best aisle size combinations.