ACADs (08-006) Covered Keywords Chilled Water System Description Supporting Material

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Title: Chilled Water System Number: AT-1260-PP-Chilled WaterRevision: 1.0 Program: NUET 1260 Author: Rob ThomasDate: 5/19/11 Approved: Date: Instructor Guidelines: Lesson Format PowerPoint Presentation Materials Computer Projector Evaluation Written exam in conjunction with other lesson plans, presentations, and handouts Remarks None References V-LO-TX

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OBJECTIVES 1.State the purpose of the Chilled Water System. 2.State the basic function of each major component in the Chilled Water System. 3.Describe how heat is transfer into and out of the Chilled Water System. 5

Refrigeration Cycle Chill Water Heat Sink 6

Economizer / Evaporator COMPRESSOR FIXED ORIFICE CONDENSER TPCW CHILLED WATER COLD WARM COOL HOT COOL HOT COLD LIQUID REFRIGERENT SAME PRESSURE COOL TEMPERATURE GASEOUS REFRIGERANT HIGH PRESSURE HIGHER TEMPERATURE GASEOUS REFRIGERANT WARM LOW PRESSURE LIQUID/GAS MIXTURE REFRIGERANT LOW PRESSURE VERY COLD TEMPERATURE HP LIQUID LP LIQUID / LP GAS HP GAS REFRIGERATION CYCLE EVAPORATOR 7

Purpose The Chilled Water System provides chilled water throughout the plant to all air conditioning and air cooling units that are required during plant operation. 8

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Components Chillers Chilled Water Pumps Chilled Water Expansion Tank Air Separators 10

Chillers Three chiller units provided Each unit consists of a 1500-ton centrifugal compressor Any two units may operate in series with the third unit in standby. 11

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Chilled Water Pumps Three horizontal centrifugal pumps are provided to move the chill water through the system (two normally running with one in standby). Each pump is rated at 150 hp at a design flow rate of 3027 gpm. 15

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Chilled Water Expansion Tank Maintains NPSH to the chilled water pumps. Allows for chilled water expansion on temperature fluctuations. 17

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Air Separator Air removal from the water – Reduces corrosion of the piping network – prevents cavitation of the chilled water pumps Air is removed from the chilled water flow stream by utilizing air separator "Tees. Turbulence causes air to be removed from the flow stream. The tees direct air to the expansion tank. 19

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Chilled Water Heat Transfer Chilled water circulates through the evaporator to transfer heat to the refrigerant. TPCW passes through the condenser to remove heat from the refrigerant. The heat, therefore, is transferred from the chilled water to the Refrigerant and from the Refrigerant to the TPCW. 25

Objectives Review 1.State the purpose of the Chilled Water System. 2.State the basic function of each major component in the Chilled Water System. 3.Describe how heat is transfer into and out of the Chilled Water System. 26