Simulation of Energy Consumption and Optimization of Control Strategy of the Central Air-Conditioning System

• Main Authors: Yu-Fu Kuo, 郭祐甫
• Other Authors: 陳希立
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/75145977328509973046

博士 === 臺灣大學 === 機械工程學研究所 === 98 === This thesis numerically investigates the power consumption of the centralized air-conditioning system under several operation strategies and then concludes a method to implement in practice. First, this study compares the performances of four updating rules of the particle swarm optimization through applying five mathematic problems. The linear-decayed inertia weight method is favorable for this study because of the stability of solutions searching. Then, four subjects, which are chiller-loading distribution, chillers and cooling towers cooperation, chilled-water and air-handler system cooperation and integrated centralized air-conditioning system operation, are specified to investigate the control strategies. The validations of the power consumption models of the air-conditioning components are accomplished. The simplified heat transfer models of cooling towers and wet finned-tube heat exchangers are also proposed and validated. The proposed simplified models can be implemented with a wide range and the predicting results are better than present models. The proposed operation strategy is optimal chilled-water supply temperature. In one sample case, the system operated under the proposed strategy can save the energy of 862.3 MW•hr and reduce the carbon-dioxide emission of 548.4 tons. The energy-saving rate can reach 14.85% compared with the energy consumption of the traditional operation strategy. The optimal chilled-water supply temperature can be correlated as a linear function of cooling load rate. Therefore, the chilled-water supply temperature can be adjusted easily and rapidly according to the system cooling load rate.