Emerson Xtreme Density manual Implementing a Hot-Aisle/Cold Aisle Design

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Starting a New Equipment Cooling Project

2.2Implementing a Hot-Aisle/Cold Aisle Design

A best practice is to use rows of equipment racks in an alternating arrangement of cold aisles and hot aisles. This is best accomplished when the layout of the file-server farm area is first being planned, and it is exceedingly more difficult to accomplish when the computer room is already populated with operating hardware.

In the cold aisle, the equipment racks are arranged face to face so the cooling air discharged up through the perforated floor tiles is drawn into the face of the computer hardware and exhausted out the back of the equipment rack onto the adjacent hot aisles.

Hot aisles are literally hot because the objective of the alternating cold and hot aisle design is to sepa- rate the source of cooling air from hot air discharge which returns to the computer-room cooling unit. Therefore, no perforated tiles should be placed in the hot aisles. as this would mix hot and cold air and thereby lower the temperature of the air returning to the cooling units, which reduces their usable capacity.

Figure 13 Hot aisle-cold aisle arrangement with under-floor source

Cold air supplied through perforated floor tiles is drawn into racks

Heated air expelled from racks is drawn into cooling unit and returned to floor supply

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Contents Liebert Xtreme Density Page Table of Contents Specifications XDH and Liebert XdcfIii Tables Liquid Liquid/Vapor Mix CoolFrame, XDH Liebert Heat Rejection Air Cooled or Water/Glycol Cooled Direct and Indirect System ConfigurationsEuropean Union Fluorinated Greenhouse Gas Requirements Pumped RefrigerantLiebert XDO-Overhead Cooling Module Liebert XDV-Vertical, Above-Cabinet Cooling Module Liebert XDH-Horizontal Cooling Module Liebert Xdcf Liebert Xdcf units on BladeFrame EX cabinetsLiebert XDA-Air Flow Enhancer Liebert XDP-Pumping Unit Liebert XDP Minimum LoadLiebert XDC-Refrigerant Chiller Liebert XDC Minimum LoadLiebert XD Field Piping Flexible Piping Kit Liebert XD field-installed port kits header connection sizeLiebert XD Piping Prefabricated HeadersDetermining Cooling Equipment Needs Implementing a Hot-Aisle/Cold Aisle Design Hot aisle-cold aisle arrangement with under-floor sourceDetermine Cooling Requirements and Select Liebert XD System Calculate the Heat Load to be Handled by Liebert XD SystemSelecting Liebert XD Cooling Modules Airflow Requirements for Liebert XD SolutionsConfiguring a Liebert XD System Number of Modules Supported by a Liebert XDP or Liebert XDCLiebert XDO Placement Determining Spacing of Liebert XDOs in an AisleLiebert XDO spacing-horizontal and vertical Liebert XDV Unit Placement Liebert XDV is suspended From ceiling structureInput Information Step Results Liebert Xdcf Placement Liebert Xdcf unit mounting locationsLiebert XDH Placement Liebert XDP/Liebert XDC PlacementInterlaced piping arrangement For enhanced protectionInterlaced piping arrangement for enhanced protection For enhancedProtection Liebert XD Refrigerant Liebert XD Piping System DesignSupply, return pipe sizes for refrigerant loop Key to Piping Pipe Function Size / Equivalent Pipe LengthRefrigerant Pumped Liebert XD Piping SlopeBypass Flow Controllers XD CoolFrame, XDH, XDO or XDVLiebert XDP Liebert XDC Determining Refrigerant Volume Liebert XDP/Liebert XDC Pumped R-134a Circuit VolumeSystem refrigerant charge for the supply and return mains Return Line Diameter 5/8 Return Line DiameterCalculating refrigerant charge-example Liebert XDC DX R-407c Circuit Volume-Air Cooled UnitsCalculating Refrigerant Charge-Example Worksheet to calculate refrigerant chargeOutdoor condenser charge-R-407c Chilled Water PipingElectrical Indoor water/glycol cooled module R-407c refrigerant chargeLiebert XDO Standard Features Optional Features Liebert XDOLeft Side XDO 24-1/8 Rear of XDO Liebert XDO internal mounting location Liebert XDV Standard Features Liebert XDO top and front electrical access pointsOptional Features-Liebert XDV Liebert XDV dimensionsDetail Area a Detail a Power Source Liebert XDV electrical connections for CSA-approved units Suspending single Liebert XDV from Unistruts Page Liebert Xdcf Standard Features Liebert XDPXD CoolFrame, XDH, XDO or XDV Liebert Xdcf Mechanical Considerations Liebert TMReturn Pipe Liebert Xdcf Installation Considerations Liebert Xdcf Piping Connection Methods and PointsEgenera BladeFrame Liebert XDH Standard Features Optional Features-Liebert XDHHeader System Liebert XDH dimensions Supply and return piping connectionsRecommended Arc Or 2-5/8 O.DRear XD Cooling Module Either 5/8 or 7/8 Refer to for detailsLiebert XD Liebert XDV CoolFrame Liebert XD Flex Pipe KitLiebert XD Flex Pipe assemblies, supply and return Liebert XDHLiebert XD Piping Dimensions and Features Piping Installation Method prefabricated headersTwo-port prefabricated piping legend Four-port prefabricated piping legend Branch Piping Standard Run Long Run Four Port 186551G21Five-port prefabricated piping legend Branch Piping Standard Run Long Run Five PortTen-port prefabricated piping legend Branch Piping Standard Run Long Run Ten Port 186650G51Liebert XDP Standard Features 33-1/8 990 1067 XDP160Unit piping outlet connection sizes, inches, OD Cu Model Pipe Connection Point 50/60 HZEnclosure Cover Customer Power Liebert XDC Standard Features Liebert XDC Optional FeaturesLiebert XDC piping locations Liebert XD Chiller piping connection sizesLiebert XDC Water/Glycol Piping Connection Sizes Piping locations-floor stand and valve assembly Front view of Liebert XDC and electrical enclosures Switch Transformer Electrical handy box, factory-installed with cover Liebert XDC Extra Low Voltage field connections points Liebert XDC160 specifications Piping Connections Performance DataHeat Rejection Equipment Performance Data204 Liebert XDP160 specifications Liebert XDO16 specifications Liebert XDO20 specifications Pipe Connections without flex pipeSides, Front and Rear Liebert XDO20 dimensions-domestic and export Liebert XDV8 specifications Liebert XDV10 specifications Liebert XDV8 dimensions-domestic and export Liebert XDV10 dimensions-domestic and exportLiebert Xdcf specifications Liebert XDH specifications Specifications Specifications Page Ti n Ne tIti That