Chiller part .1

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Arizona Western College**We aren't endorsed by this school

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BIO SDCASD

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Mechanical Engineering

Date

Jan 12, 2025

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Uploaded by CountTeam22382

BuUÌngMEP DESIGN TOOL0 Log In BUILDING CALCULATORSIntroMore...Chilled & Condenser Water Flow RateA Water-cooled Chilled Water System primarily consists of Condenser Water and Chilled Water loopsSt te stCONDENSER WATER FLOW3.0 USGPMITONNExoCONDENSER WATER PUMPOFEXPANSION ALCHI-LED WATER PUMPFLOW

xoAIR HANDLER UNIT SxoSizing of header and pipes depends largely on the flowrate of water through the pipes. It is common for Engineers to estimate the Chilled Water and Condenser Water Flowrate based on their tonnage, as 2.4 usgpm/tonne for Chilled Water, and for Condenser Water, 3 usgpm/tonne.This Rule of Thumb figures (Flowrate per tonne) don't just appear out of nowhere. Theoretically, they shall be varied to changes in AT of Chiller and Cooling Tower, according to the formula below.Q =mc9Q =mcATQ— Energy in Joules expanded to cool m kg of water at specific heat capacity c J/kg-l O C-I by AT o cm Mass of Water, kg c Specific Heat Capacity of Water, 4190 J/kg/ o c= AT = Difference between Entering and Leaving Temperature of Chiller/Cooling Tower, o cThis calculator estimates the value of the flowrate per tonne (Rule of Thumb) figure for Chiller & CT flowrate based on Delta T in the formula above. It also calculates the flowrate of Chilled water or Condenser Water Flow rate based on the computed usgpm/tonne and tonnage of the waterside equipment.Flowrate = Flow (usgpm)/Tonne x Tonnage of Chiller/Cooling TowerAfter the flowrate (usgpm) for the CT and Chillers' pipes and headers are obtained as shown above, pipes and header sizes can be calculated by manipulating the allowable velocity (fps).Generally accepted velocity of water for different segments of chilled and condenser water pipes is shown in the tabulation below.Pipe SystemAdopted VelocityGenerally Accepted RangePump Header@ 10 ft/s<15 fpsPipe Riser@ 10 ft/sfpsPump Intake@ 7 ft/s<8f sPump Outlet@ 9 ft/sfpsAt the adopted velocity, pipe sizes can be determined from the tabulation below.Steel Pipe Nominal Diameter (Inch)SteelPipeNominal Diameter (mm)Max. Chilled Water Flowrate (usgpm) based on Adopted VelocityPump Header @ 10 fpsPipe Riser@ 10 fpsPump Intake @ 7 fpspump Outlet@ 9 fps41004004002753605125625625440560615090090063081082001550155011001400

102502450245017202200123003500350025003200143504300430030003900164005700570040005100184507300730051006500205009000900064008200246001325013250920012000266501560015600110001400028700180001800012600165003075021000210001460018000Example:goo USGPMCONDENSER WATER

PUMP 2 870F1 : CalculatingEowr.atQp.e.LtQnne-(usgpmLRT)Chilled Water AT e = AT IO O F54 OF 44 0 F55= 54 •X —OC= 30 0 C —24.440 C= 5.56 6 CX 44

Q = mcg12000 btu -m x 4190 J kg loc 1 x 5.56 o c12000 x 1055.06 J m x 4190 x 5.56 ac12000 x 1055.06= 543.546 kg4190 x 5.56This means that 12000 btu is required to reduce the temperature of 543.546 kg of water by 5.56 oc If this happens in 1 hour,12000 btu/h is required to required to reduce the temperature of 543.546 kg of water per hour by 5.56 o c12000 btu543546 kg12000 btu/h543.546 kg/h1 Tonne543.546 Liter/h1 Tonne2.39 usgpm = 2.4 usgpmChilled Water Flowrate: 2.4 usgpm/RTCondenser Water AT e = AT = 80F95 0 F _ 870F55= 95 x- o c— 87 x — o c= 52.780C —48.33 0 C= 4.450CQ = mce12000 btu = m x 4190 J kg -IO C-I x 4.45 o c12000 x 1055.06 J m x 4190 x 4.45 o c12000 x 1055.06= 679.02 kg4190 x 4.45This means that 12000 btu is required to reduce the temperature of 679.02 kg of water by 4.45 o cIf this happens in 1 hour,12000 btu/h is required to required to reduce the temperature of 679.02 kg of water per hour by 4.4512000 btu679.02 kg12000 btu/h 679.02 kg/h1 Tonne679.02 Liter/hI Tonne2.99 usgpm 3 usgpmCondenser Water Flowrate.• 3.0 usgpm/RT2: Calculating-Elowr-ate-(usgpm)

CONDENSERWATER PUMP 2870FChilled Water PipeQ = 300RT x 2.4 usgpm/RT = 720usgpmChilled Water Pipe HeaderQ 300RT x 2.4 usgpn1/RT x 2 Chiller1440usgpmCondenser Water PipeQ 300RT x 3.0 usgpm/RT 900usgpmCondenser Water Pipe HeaderQ = 300RT x 13.0 usgpm/RT x 2 CT = 1800usgpm3: Sizing±.i900 USGPM -200 MM

Pipe Sizing based on adopted fluid velocity:Steel Pipe Nominal Diameter (Inch)Steel Pipe Nominal Diameter (mm)Max. Chilled Water Flowrate (usgpm) based on Adopted VelocityPump Header @ 10 fpsPipe Riser@ 10 fpsPump Intake @ 7 fpsPump Outlet @ 9 fps10040040027536051256256254405606150900720900630810820015501550900110010245017202200123003500350025003200143504300430030003900164005700570040005100184507300730051006500205009000900064008200246001325013250920012000266501560015600110001400028700180001800012600165003075021000210001460018000200ø

CONDENSERWA TERPUMP 2870F

A down oadab e Excel File for Chilled & Condenser Water Flow rate per tonne (& flow rate) IS available below.Chilled & Condenser Water Flow rateCalculator (Excel)Chilled & Condenser Water FlowrateThis Calculator derives the commonly used flowrate per refrigeration tonnage (usgpm/RT) values for Chilled Water and Condenser Water and computes pipes' flowrate for sizing purpose.AT for Chiller/Cooling TowerAT for Chiller/Cooling TowerCC)Back to Top(02019 by Engineering Ca culators.Chiller Refrigeration Tonnage (RT)300Flowrate per tonne (usgpm/RT)2.4 usgpm/RTFlowrate (usgpm)720.0 usgpm