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BCA-IMDA Green Mark for New Data Centres (Version NDC 1.1)Proposed Data Centre Facility Energy ModelThe computer simulation of the data centre facility and systems shall be carried out with an approved energymodelling software. A typical building energy modelling program may be used with the following enhancements:a) The program must be able to accept a high proportion of internal loads from electrical equipmentb) A separate calculator shall be used to estimate the losses in the power supply chain (transformers,switchgear, UPSs and PDUs.) under various load conditions. These losses shall then be included asadditional internal loads, dissipated as heat, at the appropriate spaces housing such equipment.c) The system configurations must be able to accept redundant equipment and sequencing arrangementsthat enable the spare equipment capacity to be on “hot” standby, i.e. running together with base capacity.Calculate the proposed data centre performance using the energy modelling software at full load, 66% and 33%load. Determine the PUE and compare with the reference model to obtain the improvements in energyperformance at the various load points.The energy performance improvements may come primarily from facility infrastructure design, selection ofequipment, their capacities and part-load characteristics and how they are operated. Savings related to theenergy use by the IT equipment will not be assessed in the model. The designer may use the opportunity todetermine the optimum operating configuration of equipment and systems in terms of energy performance butmust commit to the selection in the submission, which will be subject to verification in accordance with section 13.1-2 Systems Energy EfficiencyOverall Data Centre Energy Efficiency must becorroborated by the component systems efficiencyin order to identify areas of improvement in the datacentre operations.1-2-1 Cooling SystemEncourage the use of high efficiency cooling system,both in terms of equipment efficiency and systemconfiguration, to minimize the energy consumption.The performance of the overall cooling system forthe data centre shall be based on the efficiency atfull installed design capacity (N) plus any additionalcapacity that is required to maintain continuousavailability of the service during operation (e.g.N 1).The systems to be considered are as follows –(a) Water-Cooled Chilled-Water Plant, comprising:a) Water-Cooled Chillerb) Chilled water pumpc) Condenser water pumpd) Cooling tower or Heat Rejection UnitBaselinePrerequisiteRequirementsMinimum watercooled central chilledwater plant efficiencyPeak Cooling Load 500 RT 500 RT0.90kW/RT0.80kW/RTa) Water-Cooled Chilled-Water PlantPeak data centre cooling load 500 RT4 points for meeting the prescribed chilled-water plantefficiency of 0.90 kW/RT0.225 point for every percentage improvement in thechilled-water plant efficiency over the baselinePoints scored 4 0.225 x (% improvement)6(Maximum of 8 points)

BCA-IMDA Green Mark for New Data Centres (Version NDC 1.1)Peak data centre cooling load 500 RTNote: Stricter minimum performance applies forGold and higher ratings (see pre-requisiterequirements)5 points for meeting the prescribed chilled-water plantefficiency of 0.80 kW/RT0.15 point for every percentage improvement in thechilled-water plant efficiency over the baselinePoints scored 5 0.15 x (% improvement)(Maximum of 8 points)(b) Air Cooled Chilled-Water Plant / Unitary AirConditioners (DX CRAC Units):Air cooled Chilled-Water Plant:Air-Cooled ChillerChilled Water PumpPeak data centre cooling load 500 RTUnitary Air-Conditioners:Variable Refrigerant Flow (VRF) SystemSingle-Spilt UnitMulti-Spilt UnitBaselinePrerequisiteRequirementsPeak Cooling Load 500 RT(b) Air Cooled Chilled-Water Plant/ Unitary Air-Conditioners4 points for meeting the prescribed air-conditioningsystem efficiency of 1.00 kW/RT0.24 points for every percentage improvement in the airconditioning system efficiency over the baselinePoints scored 4 0.24 x (% improvement)(Maximum of 8 points) 500 RTPeak data centre cooling load 500 RTMinimum systemefficiency of aircooled chilled-waterplant or unitaryconditioners1.00kW/RT0.90kW/RT5 points for meeting the prescribed air-conditioningsystem efficiency of 0.90 kW/RT0.49 points for every percentage improvement in the airconditioning system efficiency over the baselineNote: Stricter minimum performance applies forGold and higher ratings (see pre-requisiterequirements)(c) Using chilled water from a central facility (e.g.district cooling system or central chilled water plantnot operated solely to serve the data centre)For data centres using district cooling system, datafrom the central plant will be used for thecomputation of the cooling system performance.Note: Combination of system typesWhere there is a combination of system types, thecomputation of the points awarded will be pro-ratedbased on the actual cooling capacity supplied byeach system type, or by the operating hours, if thedifferent systems are not operating at the sametime.7Points scored 5 0.49 x (% improvement)(Maximum of 8 points)(c) Using chilled water from a central facilityPoints in accordance with above based on central plantdata. If no data is available, 4 points will be applied.

BCA-IMDA Green Mark for New Data Centres (Version NDC 1.1)(d) Air Management System:(d) Air Management SystemComputer Room Air-Conditioning Unit (CRACs)2 points for meeting baselineBaseline – Fan power limitation in CRAC of 0.25W/CMH (0.9 kW/m3/s)0.1 Point for every percentage improvement in the airdistribution system efficiency over the baselineBase design: CHW 250RT , DX below 250 RT(Up to 4 points)A variable volume design to vary the airflow rate asa function of actual load is encouraged and shouldhave controls and/or devices (such as two-speed orvariable speed control) that will result in fan motordemand of no more than 50 percent of designwattage at 66 percent of design fan speed.1-2-2 Electrical SystemTo have the most efficient electrical power supplysystem providing the required level of redundancywhile maintaining high load factors.Building transformers shall have a transformationefficiency of at least 98%. Transformation lossvalues shall be based on measuring the loss acrossthe building transformers that is supporting the datacentre operation. If this is not available, it will becalculated based upon the DOE/ NEMA TP-1transformer efficiency standard or equivalent, andthe actual percentage loading of each transformer.The IT power chain efficiency includes transmissionlines, switchgear, UPSs and PDUs serving the ITequipment. Efficiencies higher than the baseline(minimum) efficiency, as shown in the table below,depending on the UPS load factor, will qualify foradditional points. Values between the UPS LoadFactors indicated in the table will be linearlyinterpolated.UPS Load FactorMinimum IT PowerChain Efficiency25%73%33%78%50%83%66%85%75%86%100%88%The UPS Load Factor shall be determined as:UPS Load Factor Total UPS Output / TotalInstalled UPS Capacity (N)The IT Power Chain Efficiency shall be determinedfrom a separate calculator to be provided, based onswitchgear, UPS and PDU selection and theirsystem configuration.82 points4 points for achieving minimum efficiency.0.5 points for every 2% improvement in efficiency over theminimum.(Up to 6 points)

BCA-IMDA Green Mark for New Data Centres (Version NDC 1.1)1-2-3 IT EquipmentTo have policies that require the procurement anduse of the most efficient ICT equipment which meetthe demand, while providing the required level ofredundancy.(i)ICT equipment, including servers, storagedevices and network systems, that areEnergy STAR rated, where available.(2 points)(ii)Power control of ICT equipment. Lowpower modes, Power capping.(minimum25% of the equipment enabled)(2 points)(iii)Software control technologies, such asvirtualization and optimizing algorithms ordynamic control of equipment forminimizing energy utilisation.(iv)Monitoring of ICT or Server EquipmentUtilisation.(2 points)(2 points)Note: The section 1-2-3 is applicable only to data centresthat have operational control over the ICT equipment1-3 Energy Efficiency and PerformanceVerification1-3-1 Commissioning of Energy Systems(4 points)To verify that the data centre’s energy relatedsystems are installed, calibrated and performaccording to the owner’s project requirements, basisof design, construction documents and that theymeet the minimum requirements of the Green Markcriteria.Commissioning shall be carried out at multiple loadpoints (33%, 66% and 100%) and under normalutility operations, maintenance operations andfailure conditions.The commissioning shall include verification of thePower Use Effectiveness (PUE) according to thedesign criteria at partial and full load conditions.(3 points)1-3-2 Measurement and Verification PlanThe purpose of a measurement and verification planis to have the ability to reconcile the actual datacentre energy consumption over time with thedesign performance.Develop and implement a measurement andverification (M&V) plan.The M&V period must cover at least 1 year of postconstruction occupancy. Using the partial (33%,66%) and full load design projections andcommissioning results, compare actual operatingconditions to the plan, and provide a narrative tosummarize performance, explaining where resultsvary from plan and including average hourly PUE.9

BCA-IMDA Green Mark for New Data Centres (Version NDC 1.1)Provide a process for corrective action if the resultsof the M&V plan indicate that energy savings are notbeing achieved.1-3-3 Energy Metering and Reporting of PUEData centre PUE metric from all energy sourcesshould be measured and trended over time; so thatthe data centre owner and/or operator can verify thatthe energy related systems are performingaccording to the basis of design.(3 points)The data centre shall, at a minimum, be equippedwith energy metering to provide total facility powerand energy usage and total IT equipment power andenergy usage on a historical basis, in order todetermine instantaneous and average PUE data.Besides PUE determination, the data centre shall beequipped with energy metering to provide power andenergy usage for the facility’s power transformationand distribution systems, cooling systems and anyon-site generation and trending of these metrics ona historical basis.1-4 Data Centre Design and EnergyManagement1-4-1 Data Centre Planning and DesignDemonstrate that the data centre planning anddesign:(i) Maintain balance between efficiency &resilience of data centre using designanalysis of the operating model to balancecost & efficiency with resilience(3 points)(ii) Promote scalable expansion by building upcapacity in a modular approach todeployment in order to improve efficiencyand ability to respond to businessrequirements(2 points)1-4-2 Data Centre Operations and EnergyManagementHave policies that promote continuity of informationto ensure that energy-efficient operating strategiesare maintained; and provide a foundation for trainingand system analysis.Management commitment towards obtaining SS 564certification, including intent, measures andimplementation strategies of energy efficiencyimprovement plans to achieve energy target set overthe next three years.10(5 points)

BCA-IMDA Green Mark for New Data Centres (Version NDC 1.1)1-5 Energy Efficient Features and InnovationsEncourage the use of innovative energy efficientequipment, system or design features.To qualify, the features must achieve significant,measureable improvement of energy performance inone of the following areas:(a) innovative cooling systems or features (includingfree air-cooling, direct liquid cooling and twophase systems, etc)(b) innovative power supply, back-up power or UPSsystems(c) IT operations, maintenance or system upgradestrategies not covered by Section 1-2-3 above(d) radical changes in data centre design, operationsor systems not covered in any section above.2 points for each innovation that demonstrate the following: The intent of the proposed innovation The additional energy benefits delivered The proposed requirements for compliance The proposed performance metrics to demonstratecompliance and the approaches (strategies) usedto meet the requirements2 points for every 1% replacement of electricity usage withrenewable energy(Up to 10 points)Encourage the application of renewable energysources in data centres.11

BCA-IMDA Green Mark for New Data Centres (Version NDC 1.1)Other Green RequirementsPart 2 - Water Efficiency (Total Points:12 )Green Mark Points2-1 Water Metering and Water Leak DetectionUse of Water Efficient Fittings(a)Provide private-metering and potable water leakdetection system for better control andmonitoring, such as:(i) To monitor the water consumption onmonthly basis(ii) Provision of private-meters for major wateruses (e.g. cooling towers)(iii) Linking all private-meters to the BuildingManagement System (BMS) for leak detection2 point(b) Encourage water use efficiency by specifying indesign the use of water efficient fittings underWater Efficiency Labelling Scheme (WELS)2-2 Alternative Water SourcesUse of suitable systems that utilize alternative watersources for non-potable uses: cooling tower make upwater, irrigation, washing, water features, toiletflushing, etc to reduce use of potable water.Alternative sources can include rainwater, greywater(for toilet flushing only), NEWater, condensateharvesting from the cooling system and recycled waterfrom approved sources.1 pointPoints awarded based on calculated %reduction in potable water usage of theapplicable uses 50 %- 3 points 10 % to 50 % - 2 points 10 %- 1 point(Up to 3 points)2-3 Cooling Towers Water UseCalculate percentage savings over baseline annualconsumption.The baseline consumption is calculated based on thefollowing:(a) Evaporation rate of 1% water flow rate for each 7K of water temperature range,(b) Drift loss of 0.002% water flow rate for counterflow towers and 0.005% water flow rate for crossflow towers, and(c) Use of cooling tower water treatment systemwhich can achieve 7 or better cycles ofconcentration of acceptable water quality.12Points awarded based % saving over baseline. 50 % 30 %- 6 points- 4 points(up to 6 points)Note: The section 2-3 is applicable only todata centres using water-cooled systems.

BCA-IMDA Green Mark for New Data Centres (Version NDC 1.1)Part 3 - Sustainable Construction & Management(Total Points: 12)Green Mark Points3-1 Refrigerants and Fire SuppressantsTo reduce global warming and damage to the ozonelayer by minimising the release of greenhouse gasesand ozone depleting substances.(a)Use Refrigerants with ozone depletion potential(ODP) of zero or with global warming potential(GWP) of less than 100.1 point(b)Refrigerant leak detection monitoring system atcritical areas of plant rooms containing chillersand other equipments with refrigerants.1 point(c)In server rooms, use of Fire Suppressants withzero ODP or GWP of less than 100.1 point(d) In UPS and Battery rooms, use of FireSuppressants with zero ODP or GWP of less than1001 point3-2 Sustainable ConstructionEncourage recycling and the adoption of buildingdesigns, construction practices and materials that areenvironmentally friendly and sustainable.(a) Use of Sustainable and Recycled Materials(i) Green Cements with approved industrial byproduct (such as Ground GranulatedBlastfurnace Slag (GGBS), silica fume, fly ash)to replace Ordinary Portland Cement (OPC) byat least 10% by mass for superstructural works.(ii) Recycled Concrete Aggregates (RCA) andWashed Copper Slag (WCS) from approvedsources to replace coarse and fine aggregatesfor concrete production of main buildingelements.(1 point)Extent of Coverage : The total quantity used(in tonnage) for replacement of the coarse orfine aggregates must not be less than theminimum usage requirement that is2[0.03 x Gross Floor Area (GFA in m )]Note: For structural building elements, the use of RCAand WCS shall be limited to maximum 10%replacement by mass of coarse/fine aggregatesrespectively or as approved by the relevant authorities.1 points for the use of RCA to replacecoarse aggregates1 points for the use of WCS to replacefine aggregates(Up to 3 points for NDC 3-2(a)(i) and (a)(ii))(b) Concrete Usage Index (CUI)Encourage designs with efficient use of concrete forbuilding components.Project CUI (m3/m2)Points Allocation 0.70 0.501 point2 pointsNote: The section 3-2 is applicable only tostandalone data centres13

BCA-IMDA Green Mark for New Data Centres (Version NDC 1.1)3-3 Sustainability Policy3-3-1 Sustainable Purchasing1 pointEstablish a policy to promote the procurementand use of environmentally friendly products thatare certified by local certification bodies.3-3-2Waste Management(a) Establish a policy to promote and encouragewaste minimization(b) Establish a policy to promote waste sorting,collecting, quantifying, monitoring and recycling ofa large range of waste generated in-house.Provide facilities or recycling bins for collectionand storage of different recyclable waste such as:1. IT related waste such as, electronic equipment2. Plastic waste3. Metal waste4. Paper wastePart 4 – Indoor Environmental Quality (TotalPoints: 8)1 point1 pointGreen Mark Points4-1 Indoor Air Quality PerformanceTo promote a healthy indoor environment.(a) In occupied areas to provide means to monitorCO2 and particulate filtration media inaccordance with SS554:2009 Code of Practicefor Indoor air quality for air-conditioned buildings'2 point(b)1 pointIn unoccupied space and server areas to providemeans to supply treated ventilation air ondemand.4-2 Lighting Quality and ManagementTo encourage good workplace lighting quality topromote productivity and occupant comfort(a) Specify in design that in occupied space lightinglevel to comply with SS531. Lighting is usercontrollable and fluorescent lamps with electronicballasts or LED lamps.1 point(b) Specify in design that in machine spaces/serverrooms lighting to be in accordance withrecommendations of SS564. Use of occupancysensors, bi-level lighting, task lighting is to bepromoted.2 point14

BCA-IMDA Green Mark for New Data Centres (Version NDC 1.1)4-3 Thermal Comfort and Noise(a) In occupied areas specify comfort level to complywith SS 553 (Temperature and relative humidity)1 point(b) In occupied areas, specify in design that internalnoise level are maintained at an appropriate leveland to comply with SS553 (low dbA rating)1 pointPart 5 – Other Green Features (Total Points: 10)5-1 Green Features and InnovationsTo encourage the use of other green features whichare innovative or/and have positive environmentalimpact.Features

(i) For Data Centres using Water Cooled Chilled-Water Plant: Green Mark Rating Peak Data Centre Cooling Load (RT) 50 0 500 Efficiency (1) (kW/RT) Certified 0.9 0 0.8 0 Gold 0.9 0 0.8 0 Gold Plus 0.8 0 0.7 5 Platinum 0.8 0 0.7 5 (ii) For Data Centres using Air Cooled Chilled-Water Plant or Unitary Air-Conditioners: Green Mark