Historically, the rising cost of energy has been a huge driver for data center energy efficiency, and the contribution of this consumption to climate change is ever more evident. As the industry begins to look beyond energy consumption, it has become aware that environmental impact derives not just from energy consumption, but also from our use of natural resources. To ensure optimization measures do not cause a burden shift, these interdependent issues should not be considered in isolation. Data centers consume energy to power and cool IT equipment. Current optimization efforts largely focus on the operation of cooling technologies.

The Thermosyphon Cooler Hybrid System (TCHS) integrates the control of a dry heat rejection device, the Thermosyphon Cooler (TSC), with an open cooling tower. This new heat rejection system embraces a “smart use of water,” using evaporative cooling when it is most advantageous and then saving water and modulating towards increased dry sensible cooling as system operations and ambient weather conditions permit. Johnson Controls partnered with the National Renewable Energy Laboratory (NREL) along with Sandia National Laboratories to deploy the TSC as a test bed at NREL’s high-performance computing (HPC) data center in the first half of 2016.

Citi operates and maintains Data Center space in (3) floors 6, 7 and 8 at the 390 Greenwich street facility. This paper focuses on the 7^th and 8^th floors. The 8^th floor data center comprises approximately 15,000 sq ft (1,500m²) with a power consumption of 500kW, and the 7^th floor data center approximately 41,000 sq ft and a power consumption of 1,980kW. The major consumers of energy are the IT equipment, Electrical distribution gear and Cooling equipment. This paper details a study to evaluate the existing conditions of these spaces, and proposals to change to the IT layout, and cooling configuration.