Energy saving evaluation of a novel energy system based on spray cooling for supercomputer center. (15th December 2017)

• Record Type: Journal Article
• Authors: Chen, Hua; Cheng, Wen-long; Zhang, Wei-wei; Peng, Yu-hang; Jiang, Li-jia
• Is Part Of: Energy. Volume 141(2017)
• Page Start: 304
• Page End: 315
• Publication Date: 2017-12-15
• Subjects: Energy saving -- Supercomputer -- Spray cooling -- Multi-nozzle array -- Absorption chiller -- Energy efficiency; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2017.09.089
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: To improve the energy efficiency of supercomputer center, a novel energy system aimed at enhancing cooling efficiency while reusing waste heat is proposed. The energy system integrates a plug-type spray cooling system with a two-stage absorption chiller driven by spray cooling waste heat. Overall modeling of integrated energy system is analyzed based on spray cooling model and absorption chiller model. Energy saving evaluation is conducted based on Dawning 5000A supercomputer in China. It is found that the novel energy system is much efficient than the original energy system in all seasons. The energy saving effect is highly affected by inlet temperature of spray cooling. With the increase of inlet temperature, the spray cooling capacity decreases while the absorption cooling capacity increases. Thus, an optimal inlet temperature of 55 °C is obtained at which the lowest cooling power consumption, lowest power utilization effectiveness (PUE) and highest energy saving efficiency (ESE) can be achieved. Taken Dawning 5000A supercomputer for example, the system can achieve ESE as high as 49% and PUE within best practice scenario of 1.44. At the optimal design, cooling power consumption only accounts for 16%. Power consumption devoted to running the IT equipment is improved from 60% to 67%. Highlights: A novel energy system based on spray cooling for supercomputer center is proposed. The system integrates spray cooling with waste heat driven absorption chiller. Modeling of integrated energy system under different working conditions. Inlet temperature strongly affects cooling capacity and optimum temperature exists. The system can achieve energy saving of 49% and PUE within best practice scenario.