The Analysis of Energy Saving Efficiency for Air-Conditioning System Using Cooling Water Temperature Difference Control

• Main Authors: Yung-Hua Lin, 林永樺
• Other Authors: Dr. Yu-Lieh Wu
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/43003047713007072185

碩士 === 國立勤益科技大學 === 冷凍空調系 === 98 === Semiconductor factories and optoelectronics factories not only belong to high-tech industries, but also are the industries that consume energy tremendously. Take an optoelectronics factory in Northern Taiwan for example. Its facility system of electricity distribution in the entire factory has accounted for 59.4%, while the chillers have accounted for 24.9% and the process machines have accounted for 40.6%. Therefore, the first priority for energy conservation certainly lies in reducing the power consumption of the chillers in the facility system, which will result in even more significant effects. In this study, the findings indicated: Theoretically, a chiller has 80%~90% of the load; the chiller whose inlet water temperature of cooling water is 26℃ has the lowest COP(Coefficient of Performance) of the energy consumption in singe refrigerating ton, which can reduce energy waste. In practical applications, the percentage rate frequently applied to the operation of a chiller is 60%~90%. Thus, under the same load,if the cooling water has small temperature difference and large flow, and if the cooling water pump is run in full-load operation, the superfluous cooling water through pipes will result in energy consumption in the cooling water pump, which will not result in too much benefit for saving power consumption in chillers. Therefore, when we manage the operation of a Chilled Water System, we can achieve the goal of reducing the operating costs, by using a Variable-Frequency Drive (VFD) to regulate the cooling water volume necessary for the chiller and by analyzing the water-side temperature difference optimization for the condenser.