Improving Data Center Operational Reliability and Energy Efficiency Through Hot-Standby based ITE Cooling System Redundancy

In modern data centers, cooling systems for IT equipment (ITE) play a vital role in maintaining continuous operation and promptly adapting to fluctuations in IT service demands. This research introduces a hot standby sparing (HSP)- based cooling system that enhances redundancy while maximizing energy efficiency, particularly for data centers that demand N+1 or higher redundancy to ensure reliable, uninterrupted performance. Redundancy strategies in data centers are generally categorized into hot standby (HSP), warm standby (WSP), and cold standby (CSP). For facilities equipped with variable speed drive (VSD) or variable frequency drive (VFD) technologies and requiring N+1 or greater redundancy, HSP-based cooling is recommended for superior energy optimization. A case study conducted on a large-scale, 30 MW-class A-Data Center compared the energy performance of CSP and HSP cooling systems. Findings revealed that the HSP-based system reduced cooling power consumption by approximately 15% compared to the CSP-based alternative, while achieving a power usage effectiveness (PUE) of 1.20. These results highlight the HSP approach as the most effective solution for significantly improving energy efficiency in cooling operations without necessitating substantial upgrades or additional investments in infrastructure.