运行温度以支持性能、能源效率和热回收.pdf

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1、Mark SteinkeWade VinsonBahareh EslamiOperating Temperatures to Support Performance,Energy Efficiency,and Heat RecoveryOperating Temperatures to Support Performance,Energy Efficiency,and Heat RecoveryMark SteinkeWade VinsonBahareh EslamiData Center Facility(DCF)The choice of facility fluid operating

2、temperature is a balance of performance,energy,and costThere is no“one-size fits all”approachUnderstand your business objectives&business needsUnderstand the challengesLook for the opportunitiesSummaryRequired inputsSpecific geography climate data Specific heat rejection system dataBegin with ASHRAE

3、 hourly weather dataUtilizing Geography&Heat Rejection System Datan20=39 Cn20=40 Cn20=49 CDry CoolerUses only ambient air and fans to reject heatPros:No compressors,no water consumptionCons:No get sub-ambient cooling(limited temperature)Evaporative CoolerUses water evaporation&fans to reject heatPro

4、s:Less energy than a compressorCons:Consumes waterDry Cooler+Trim ChillerUses dry coolers and only a chiller when neededPros:uses dry cooler for most of the year,chillers for the hottest timesCons:do have to buy a chiller and consumes some energyHeat Rejection MethodsAir Free Cooled Chiller(AFC)Uses

5、 dry coil&fans or a DX coil to reject heatPros:free cooling+chiller to improve overall efficiency Cons:consumes the moderate amount of energyWater-Cooled ChillerUses water evaporation&fans to reject heatPros:uses less energy when in closed loopCons:High water consumption Air-Cooled ChillerUses water

6、 evaporation&fans to reject heatPros:uses less energy when in closed loopCons:does consume more water than air-cooled chillersHeat RejectionEnergy ConsumptionWater ConsumptionCapExOpExDry CoolersEvaporative CoolersDry Coolers+Trim ChillerAir Free Cooled ChillerWater-Cooled Chille