頁籤選單縮合
題名 | Innovative Operation Strategies for Improving Energy Saving in a Cooling Tower System |
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作者 | Tsou, Ying; Chang, Chun-cheng; Jang, Shi-shang; | 書刊名 | China Steel Technical Report |
卷期 | 28 2015.12[民104.12] |
頁次 | 頁58-62 |
分類號 | 446.64 |
關鍵詞 | Cooling tower; Variable-frequency drive; Zone setting control; |
語文 | 英文(English) |
英文摘要 | In cooling towers, the replacement of traditional single-speed fans with Variable-Frequency Drive (VFD) fans or two-speed fans can achieve significant energy saving. However, concerns regarding frequent on/off switching and the lack of a well-devised controller discourage the widespread implementation. In this study, a temperature zone setting method is proposed to replace the traditional point setting method on fan control strategy. We also developed a multi-fans control strategy. Additionally, the highest allowed temperature of output water in the process is set as the upper limit of a temperature zone in order to further conserve energy. Both strategies are comprehensively analyzed for a virtual cooling tower that uses operational data from an existing VFD-fan-based cooling tower system at CSC. The results of on-site implementation show energy savings of 38% for a 0.75 °C zone without increasing the on/off switching frequency. The proposed strategies were further verified by an on-line field experiment. The proposed strategies can be universally and easily applied to any existing cooling tower with significant energy conservation. |
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