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유원대(Wondae Ryu),박형준(Hyoung Joon Park),조용길(Yong Gil Cho) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6
Servers that provide clouding should be prepared for data usage changes. In case of web traffic, if the power consumption of the base unit generates heat and it can not be cooled down smoothly, the clouding system will be out of the operating temperature range of the IT equipment. The efficient power consumption of the data center requires CPU technology that maintains the performance of the underlying equipment at high temperatures and technology that efficiently cools the underlying equipment. The local cooling in the enclosure rack, which is cooled inside the rack, without draining the heat generated by the server"s heat from the server rack, is the most efficient way to reduce power consumption. This paper describes server cooling system using variable liquid pump control which absorbs hot air generated by the server heat and then discharges the cooled air to the front of the server rack to discharge heat out of the rack. The server cooling unit uses PWM(Pulse width modulation) fan control to keep the cooling air temperature constant, and saves power energy by using stable cooling load and efficient power usage. By using the power consumption information of PDU(Power distribution unit) that supplies power to the server to effectively control the amount of cooling, stable operation of the cloud server equipment is ensured by fast and accurate cooling. This study controls the rotation of EEV(Electric expansion valve) and liquid pump with variable refrigerant flow control.
박형준(Hyoung Joon Park),유원대(Wondae Ryu),정성은(Sung Eun Jung),이상원(Sang Won Lee) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.6
The data centers require precise and stable environments to operate optimally for sensitive IT equipments. As the latest IT equipment becomes high density and uses the same or even more electricity than the equipment it replaced, more heat is being generated in data centers. When designing or selecting cooling system of data center, the existing facility infrastructure, the total power level of the installation, the geographical location, the physical constraints of the building and initial installation/operating costs should also be considered. In the present paper, design and economics of thermal control system for data center cooling using cold energy storage system has been proposed and discussed. Two types of cold energy storage system namely: Ice storage system and cold water storage system are explained and sized for a data center with storage capacity of 15,025 RT-h. Basically, the cold energy storage will help to downsize the chiller and decrease its runtime that will save electricity related cost and decrease green house gas emissions from the electricity generation. The proposed cold energy storage system can be connected not only new data center but also the existing data center facilities without major design changes. The ice based cold energy storage system is mainly recommended for medium to big size data centers.