DATA CENTRES | COOLING Results Project learnings The system was highly energy efficient for cooling at the demonstration site achieving an average cooling capacity of 53.5kW, average power consumption of 1.8kW, average COP of 29.7, and maximum COP of 48.3. The average COP of 29.7 was smaller than the target 40 because the existing air conditioning units took up part of the cooling load. This reduced the cooling capacity for the demonstration equipment but it gave the data centre manager the assurance of backup cooling when the new technology was operating. The indoor air temperature of the data centre during the test ranged from 18C to 25C. By using the dew point cooling system, the average power consumption of the existing air conditioning system at the demonstration site was reduced from 35.5kW to 4.7kW. By simulating the dew point cooling system performance throughout a year at the demonstration site, using a validated model, the average annual COP of the cooling system can reach 37.6, with a cooling capacity of 70kW and average power consumption of 1.9kW. Applying the dew point cooling system can reduce cooling energy consumption by more than 90%. For the demonstration cooling units, part of the cooling effect is driven by water evaporation. The water usage for the units evaporative cooling is around 400L per day the daily water charge would be around 1.60. The key learnings from the project were: (1) Dew point cooler engineering design strategy and manufacture: The design of the heat exchanger, considering the ease of manufacture, is critical in future dew point cooling projects. The size of a dew point cooler affects the installation complexity and costs significantly, which should be considered in future projects. (2) Dew point cooler data centre installation methods and the related issues: During the project, the partners investigated various installation methods of the dew point coolers at the demonstration site. The process provided experience in installing the cooling units, both internally and externally, with installation innovations to minimise interruptions to the site and reduce costs. (3) An optimised control and data presentation for the dew point cooler: The demonstration led to optimised control settings and improved data visualisation, which can be the basis for the control box of a dew point cooler. CJ This project is funded by the Department for Business, Energy and Industrial Strategys Industrial Energy Efciency Accelerator programme. Project partners include the University of Hull (technology developer), Environmental Process Systems (cooling specialist), and NPS Humber (data centre manager). This paper will be presented at the CIBSE Technical Symposium. CHENG ZENG, PhD, University of Hull (Afliate member of CIBSE), ZISHANG ZHU, PhD, University of Hull, YUNHAI LI, University of Hull (Student member of CIBSE), XUDONG ZHAO, PhD, FCIBSE, University of Hull 58 April 2022 www.cibsejournal.com CIBSE Apr 22 pp55-56, 58 Dew point cooler.indd 58 25/03/2022 15:21