• Document: In Row Cooling Options for High Density IT Applications
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In Row Cooling Options for High Density IT Applications www.totalsitesolutions.com By Ramzi Y. Namek, PE, LEED AP, BD+C; Director of Engineering 1 Users wishing to deploy high density IT racks have several “In Row” Cooling solutions from which to select. In Rows come in multiple configurations adaptable to various space and aisle constraints. They can be mounted in the ceiling, over the racks, within the racks, or in the aisle. The two most common cooling media used inside the units are either refrigerant (R134a) or water; the user has a choice to use either type based on preference and comfort level. Overhead units are meant to handle sensible cooling only and hence no condensate is typically generated in the process. In fact, the internal controls monitor dew point closely and maintain refrigerant and coil temperatures above room dew point. Vertical aisle In Rows such as the RP by APC do have humidity control. Liebert makes a self contained unit that operates either on chilled water or glycol. The message is that these units come in various “flavors and colors” to satisfy the needs for your high density cooling deployment. In this whitepaper, we will review some common In Row coolers available from vendors that have been manufacturing this type of solution for the past 5 years. We will compare and evaluate several technical and operational parameters and rank them in terms of a three-tiered favorability matrix. While this list is not inclusive of every In Row cooler type available in the market, it provides the user a starting point from which to gather intelligent information about various unit makes and models. ▲ Refrigerant Based In Row Coolers A. Rack Overhead Liebert XDV An XDV system is a modular cooling solution that mounts directly on the top of the racks or alternatively, suspended above the racks. Each unit connects to a main supply and return header utilizing either rigid or flexible piping with quick connect fittings. One option is to stack the XDV’s and install blanking panels between the openings, although this would add complexity and cost to the install. Rack Mounted XDV Sensible Cooling Only Parameter Description Evaluation Capacity (kW) Available in 8.8 kW and 10 kW Good modules. Flexibility/Scalability/ Units mount on top of Racks. Very Expandability Planning for additional units is Good relatively easy. Connects via flexible piping with quick connect fittings www.totalsitesolutions.com 2 Ease of Installation Will need coordination with overhead Very IT and power cabling Good Reliability Dual A-B Power cords for increased Excellent uptime. Two fans on each unit add to reliability. Dependent on the reliability of the XDC unit. Maintenance Effort Minimal maintenance required: Very 1. Cooling fins should be kept clean Good 2. Circulating fans are easily accessible from the front and require no lubrication. Cost of Installation Involves copper headers and quick $$$ connects with valves, controls and wiring. Requires an XDC unit. Dimensions Hx Wx D 14"x 23"x 40" B. Row Mounted – Liebert XDH An XDH system is a modular cooling solution that mounts in the row between racks or at the end of a row. Each unit connects to a main supply and return header utilizing either rigid or flexible piping with quick connects. Row Mounted XDH Sensible Cooling Only Parameter Description Evaluation Capacity (kW) Available in 22 kW and 30 kW Excellent modules. Flexibility/Scalability/ Units are floor mounted in between Very Expandability racks or at the end of a row. Will Good require planning day-one for location of units. Connects via flexible piping with quick connect

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