- 學位論文
機櫃冷卻系統變頻控制與研究
A Research on the Variable-Speed Drive Control for Rack Cooling System
摘要
本研究開發資料中心密閉式機櫃冷卻系統之變頻控制，其負載部份係使用電子式加熱器模擬IT設備之發熱量，將IT設備機櫃與冷卻系統機櫃兩機台並列後可達到密閉自體循環散熱效果，主要特點是可針對IT設備進行重點式散熱。 研究中利用可程式控制器(PLC)監控冷卻系統之狀態點，並根據出風條件與實際出風狀態之變化，以電腦進行PID運算，進而實行壓縮機與風扇變頻控制，使系統運行於適合之壓縮機頻率與風機轉速下來達到節能之效果。而出風條件則以ASHRAE TC 2011年機房環境定義中規範範圍之內，並以PUE、RCI與RTI等指標進行評估，使系統運行於合適之頻率與風機轉速下來達到節能之效果。 由實驗結果得知，於最大負載時PUE值為1.41，此結果與國內機房實際量測PUE平均值為1.9，和美國ASHRAE之300RT 等級之標準PUE值為1.52相較之下，其機櫃冷卻系統之電能使用效率皆優於國內外之案例，且RCI可穩定於100%，RTI則因機櫃設計方式因而可達到100%。
並列摘要
This study aims on the variable-speed drive control on rack cooling system. The rack cooling system is a closed loop (In-Row) system. The IT equipment cooling load in the rack is simulated by electric heater, which can be removed by the rack cooling system if IT rack is tied with cooling system rack. In the rack cooling system, the capacity and supply air are respectively controlled by inverters for saving energy and improving performance as well. The operating parameters are sent to the computer via PLC. Once the optimum PID parameters were calculated by computer program, the control signal was sent back to the variable-speed drive for the optimum control of rack via PLC. In the research, Power Usage Effectiveness (PUE), Rack Cooling Index (RCI), and Return Temperature Index (RTI) were used to evaluate the optimum operating point of the cooling system for different cooling load for the sake of energy saving. The results show that the PUE can reach 1.41 at maximum cooling load point and the RCI stable in 100%. RTI also stable in 100% by closed loop (In-Row) system. This maximum PUE is much better than the average PUE 1.9 of the surveyed data in Taiwan also better than the PUE 1.52 of baseline case per ASHRAE Std.-90.1 for a 300RT cooling system.