Water-side economizer 시스템의 냉방 성능 향상을 위한 Free cooling 운전 기간 확대 알고리즘 개발

Abstract

As demand for data centers is increasing, the importance of reducing cooling energy is emphasized. In this paper, a free cooling operation period extension algorithm has been developed based on the flow rate control in the WSE (Water-side economizer) system to improve the cooling performance of data centers. In order to increase the supply and return temperature of chilled water and reduce the cooling tower approach temperature that determines the free cooling period, CRAH (Computer room air handler) airflow, chilled water flow rate, cooling tower flow control sequence was presented. As a result, the energy consumption of the chiller decreased by 28% per year, and the free cooling operation increased by 1,324 hours. Since the developed algorithm control the operating variables of loops that make up a general cooling system and heat exchange between multiple loops, it is expected to have high scalability that can be applied to buildings and cooling systems with different conditions