Presentation on theme: "Optimizing High Density Cooling Solutions for Data Centers"— Presentation transcript:
1 Optimizing High Density Cooling Solutions for Data Centers
2 Data Centre Cooling Challenges Source: Gartner 2006 Data Center study 180 respondents
3 Some Facts Power reticulation Rack Power of 10 kW per enclosure can results from deployment of high density blade servers.90% of data centers are operating at 1.8kW per enclosureLimiting factors when considering a data centre builds are:-Power reticulationAssume a 43U cabinet, with 6 x 7U Blade servers each consuming 3kW. This means 18kw Power draw per rack, which also implies 18kW cooling required per rack!This system would typically be mission critical ,thus redundancy would also be required.Costs are huge!
4 Some Facts Cooling The limiting factors presently are: The system described would require 2,500cfm cool air at the in-take, and thus the same at the outlet (hot) isle per rackA typical 600x600 floor tile can achieve 500 cfm from a grated ventilated floor tile, and only 300cfm from a louver ventilated tile.This means that 5 floor tiles for every enclosure in a high density configuration – just not feasible!If the air reticulation cannot remove the hot air fast enough, it WILL re-circulate back to the blade server, causing it to overheat.
5 What the data centre is designed to do These work and designs are right!Problem is not the design and the layout, its how the air is directed and the volumeof air need to cool cabinets reaching 4kW-15kW per enclosure.
6 Hot Aisle/Cold Aisle Configuration DesignCooling abilityAir VOLUME becomes the limiting factor
7 “Extract from LS Cables” Expenditure on power as a percentage of costs according to Gartner will reach as highas 30% of IT budget spend and represents one of the most significant issues facing ITDirectors today.The need for Facility managers and IT managers to understand each other’s issues andareas of responsibility is fundamental in managing business energy costs.The basic questions before installing equipment into a Data Cabinet.• Do you know how much power it will really use?• Can it be easily monitored and controlled?• Where could it best be located?• Will it create hot spots? Causing the need for even more power to be used on Air conditioning• Can you accurately Capacity plan, Trend and optimise operations
8 Decision pointWill you have enough cooling with existing or upgrading cooling equipment?If so, try maximizing your infrastructure before embarking on new designs and development!Will you need High Density Solutions?Do you need ALL the High Density Now?If not can you upgrade easily when you need to?What are your options?
9 High Density Environment - Strategies Load Spreading – Provide the room with the average power and cooling requirements and spread the load across a greater area i.e. use more enclosures in a bigger data centre.Borrowed cooling – Allow high density racks to borrow underutilized cooling from adjacent racksSupplemental cooling – Add additional freestanding cooling units to specific racks within the datacenter.Whole room cooling – Provide additional capacity to allow for peak expected enclosure density. This is typically a very expensive and environmentally damaging route.
10 High Density Environment - Strategies Load Spreading – Provide the room with the average power and cooling requirements and spread the load across a greater area i.e. use more enclosuresBorrowed cooling – Allow high density racks to borrow underutilized cooling from adjacent racksSupplemental cooling – Add additional freestanding cooling units to specific racks within the datacenter.Whole room cooling – Provide additional capacity to allow for peak expected enclosure density. This is typically a very expensive and environmentally damaging route.Dedicated high density Areas – Within the standard data centre, provide a limited area that has high cooling capacity.
14 Supplemental In-Row Cooling These can be retrofitted when required
15 Supplemental In-Row Cooling AdvantagesFits into Traditional SmartRac (Standard High Density Cabinets) configurationScalable – add additional coolers when requiredCost effectiveEliminated Hot SpotsDisadvantagesNot as efficient in cooling as the environment is not containedCold air not easy to manage/direct
20 Hot Aisle Thermal Management AdvantagesHeat removal capacityEntire room flooded with cold air – better in the event of A/C failureDisadvantagesNo A/C redundancyVery high temperatures in hot aisleHigh noise levelsTemperature between rack bottom and top not constantCannot accommodate fire suppression in hot aisleA/C shut down required for servicingUse of EC fan technology reduced.
22 Cold Aisle Containment (Open Config) The void between the raised floor and the ground is flooded with cold air from the CRACThe positive pressure in the floor allows the cold air to filter into the contained aisle through vented floor tilesThis cold air is then pulled through the equipment inside the rackThe air is now warmer due to the heat generated by the equipment. The hot air is channelled upward in the plenum door by twelve fans.The hot air continues upward, through the chimney, until it is exhausted into the ceiling void
23 Cold Aisle Containment AdvantagesCold air contained and easier to manageTemperature between rack bottom and top more constantFire suppression available for cold aisle – less extinguishant requiredA/C redundancyDisadvantagesEnvironment will heat up quickly in the event of A/C failureProne to hotspots in the event of fan failure (fans must be hot swappable). Not in the case with EC fan technology.
26 Closed Loop Containment AdvantagesCombines advantages of hot and cold aisle containmentFire suppression easily accommodatedA/C redundancyMore consistency in temperatures across the rackExhausted air is re-circulated back into a/c systemHigher cooling capacityGreater control over humiditySecureNo effect on surrounding EnvironmentStand alone units. No need for raised flooringDisadvantagesProne to hotspots in the event of fan failure (excluding EC fan technology)Environment will heat up quickly in the event of A/C failureNeed to build in Redundancy.
27 In Row Cooling UnitsIntegrated cooling solution for rack mounted electronics devices and server rack, suitable for heat load up to 35 kW each rack.Complete range of models designed for all size data centre, high efficiency and the reliable design of Modrac cooling units reduce strongly the total cost of ownership and improve the return of investments.
28 Rack Cooling Solutions | Features Modular solution, suitable to install inside 43U, 300mm rackSame module for open and closed architecture96mm Air filter for open loop versionSupply connection from bottom or top2 or 3 way modulating CW valveHigh efficiency due to the air direct cooling (max DT)Small footprint
29 Rack Cooling Solutions | Features EC fan available – fans slow down and use less power, again saves costs!!Controlled by microprocessor Modrac C2020Mod-bus connection via RS 485 (opt)MIB interface for BMS monitoring (opt)Wide range of solutions, up to 35kWBuilt in redundancyManage thermal load locally, eliminate hotspotsHot swappable fan units
30 Unit PerformanceIn-Row cooling module is provided with high efficiency coils, a strong air flow it’s generated by high reliable and efficient radial fans, this ensures an effective cooling of servers in all operations conditions.The operation on ModRac’s In-Row cooler is managed by Modrac C2020 microprocessor electronic control
31 BMS and Monitoring| Features (C2020) Controlling the various operating modes• Compressor operation with enabling signal to the external motor-condensing unit (only direct expansion models)• Hotspot mode (enabled by an external thermostat) : fans rotate at maximum speed to prevent excessive temperatures in particularly critical areas of the room.• DehumidificationStep by step operator guidance via keypad• USER, to change set points, access alarm history and counters of working hours.• SERVICE, to start-up and make maintenance on the unit.• MANUFACTURER, for factory setting.Flash EPROM for easy configuration and software updates• Central configuration of units via laptop• Hardware key for uploading and downloading software without a laptop andfor copying the configuration to other units
32 BMS and Monitoring| Features (C2020) Individual forwarding of alarms• Via bus system/BMS system (optional)• Via voltage free contacts (standard) 9 off-load contacts are available. Alarms can be assigned a high or low priority.Energy-saving mode• Different kinds of capacity modulation (with valve opening and fan speed) aimed to energy saving.MonitoringRemote ControlConfiguration/SMSAudible AlarmHTTP/SNMP
33 Heat RejectionThe thermal load removed from the server rack has to be transferred outdoors. To do this, units are supported by chiller units, either in chilled water or DX state.
34 Free Cooling – Why Not?Units can have all the advantages of freecooling chiller to reduce the energy consuption. When outside tempreatures are below 18 deg C, we use the ΔT, to cool, thus keeping the condenser off and saving energy and costs.Green datacentres!
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