- 學位論文
改變磨損環間隙與冰水溫度差對空調水泵浦之節能效益研究
Energy-Saving Study on HVAC Pumps by Changing Wearing Ring Clearances and Chilled Water Temperature Differenc
摘要
本研究以南科電子廠房無塵室空調系統為研究對象，該系統採一次(Primary)�二次(Secondary)冰水方式供應空調。冷凝側運轉多年的泵浦以藉由更換磨損環改變間隙來提昇泵的效率與增加泵送輸出流量，並探討對冰水主機的耗電影響；二次冰水側以流量、溫度差、負載端壓差值設定等變化，規劃四種運轉模式並建立系統之泵浦設備耗能分析模式，再比較各種模式之泵浦節能效益。 由實際案例量測分析結果顯示，當泵浦磨損環間隙增大一倍時，流量減少5.2%，間隙大小與流量幾近等比例關係，而效損(Efficiency Losses)增加比率介於7.5%∼13%之間。此外，於製程區AHU系統維持固定進水溫，搭配空氣側風量變化進行探討，結果定風量較變風量模式其泵浦所節能的比率可達36.1 %。而在相同室內負載(60%~70%)條件下，變風量系統為滿足負荷需求，比定風量系統增加48%的水流量。於無塵室區MAU系統，若空氣側維持固定風量，水側以定流量變進水溫與變流量定進水溫兩種控制模式相較，結果指出變流量定進水溫較定流量變進水溫模式其泵浦所節能的比率可達45.5%。而由壓差感測器調整設定值分析得知，設定值每降低10%，泵浦的節能比率為2%。 綜合比較水側系統之泵浦耗能分析，以用本文所述之分析結果，不但能達到流量控制並能維持泵浦高效率運轉，強化運轉人員對泵浦耗能與效損改善的檢修能力，建立泵浦能源管理的核心價值，並做為既有工程節能改善的參考依據。
並列摘要
The purpose of this research uses the cleanroom HVAC system in a semiconductor manufactory of Southern Taiwan Science Park as a energy-saving research model that uses primary/secondary chilled water systems in HVAC system. Cooling water pump operating for many years, was changed by replacing the wearing ring clearances to improve its efficiency and increase the discharge flow rate of pump and the impact on chiller power consumption was explore. secondary chiller water system to flow rate, temperature delta-T, differential pressure setpoint in the space load terminal units, and etc change, planning and the establishment of the four operating mode of the pump equipment power consumption analysis model, and then compare the various models of the pump power saving . The analysis results showed that when the wearing ring clearance of the pump doubles, the flow reduced by 5.2%, the gap size is almost proportional to the flow,and the efficiency losses increased by a ratio between 7.5% and 13% . With AHU system to maintain constant entering water temperature, and the air side of variable air volume , the constant air volume mode has the best power efficiency, and the pump power saving reaches 36.1%. Load in the same space cooling load (60% to 70%) conditions, to meet the load, the variable air system hasto increase by 48% than constant air volume system in the flow rate of chilled water; MAU system in cleanroom area is set, air side maintains constant air volume and water side changes the chilled water temperature and flow rate. The result reveals that variable flow with constant inlet water temperature has more pump power saving than constant flow with variable entering water temperature, which reaches 45.5%. Pressure differential transmitter setpoints are adjusted, Analysis that for each 10% pressure differental setpoint reduced, results in pump energy saving rate of 2%. Comprehensively comparing the power consumption of secondary chilled water distribution variable speed pumps ,the energy analysis described in this paper can reach flow controlling as well as maintain high efficiency of pumps in normal operating condition, can maintain and enhance operating engineer’s ability－to change the pump power consumption and repair efficiency losses, can establish the core values of pump energy management, and thus can be provided as a reference basis for the energy saving improvement of existing systems or new developing projects .