运行温度以支持性能、能源效率和热回收.pdf

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