A Study on Energy Saving Performance of Variable Frequency Drive Centrifugal Chiller

• Main Authors: King-Huei Hsu, 徐金輝
• Other Authors: 卓清松
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/g3fktr

碩士 === 國立臺北科技大學 === 冷凍空調工程系所 === 94 === Centrifugal chiller is the single largest electrical load in central air-conditioning system. Energy efficiency of a chiller is critical to energy saving performance for a building. This thesis presents that the COP of a variable frequency drive (VFD) centrifugal chiller at operating conditions here in Taiwan is far better than a constant speed drive (CSD) chiller. An ARI certified computer program is used to simulate operation of two 350 tons centrifugal chillers, one is VFD and the other one is constant speed. Analyzed results show that COP of a VFD chiller operates between 100% and 40% load is up to 70% higher than that of the CSD chiller if ECWT drops to 20 ℃ from 30 ℃. COP can be further improved by resetting leaving chilled water temperature if relative humidity is not a concern. The conclusion of this thesis may provide some guidelines for those professionals when they make a selection of centrifugal chillers. Then VFD chillers may be more popularly applied in air-conditioning system design as an effective measure to achieve energy saving requirements.