| Summary: | 碩士 === 國立臺北科技大學 === 能源與冷凍空調工程系碩士班 === 98 === 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 .
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