Water-side economizer 시스템의 냉수 및 냉각수 최적 제어를 위한 냉방 에너지 절감 알고리즘 개발

Abstract

This study aims to develop and quantitatively verify the effectiveness of an optimal control algorithm for a Water-side Economizer (WSE) system to reduce cooling energy consumption in data centers. Optimal fluid combinations that minimize energy usage for each outdoor wet-bulb temperature were derived using a combined LSTM and LightGBM model. An algorithm for the optimal operation of chilled water and condenser 1, 2 water, including the selection of the most appropriate optimal fluid combination, was developed and applied to the WSE system. Comparative analysis between the model with the optimal control algorithm and the Base model revealed that the optimized model enhanced operational stability by precisely and regularly controlling the temperatures of the chilled water and cooling water. Furthermore, the Free cooling operation period increased by approximately 11.8% compared to the conventional operation, while the Chiller cooling operation period decreased by 23.4%, resulting in reduced overall system energy consumption and lowering the peak load from 180 kW to 160 kW. These results confirm that the optimal operation of chilled water and cooling water contributes to cooling energy savings and improved system efficiency in data centers.