TRG-TRC016-EN
Air Conditioning Clinic Chilled-WaterSystems
One of the Systems Series
BUSINESS REPLY MAIL
BUSINESS REPLY MAIL
THE TRANE COMPANY Attn: Applications Engineering
3600 Pammel Creek Road La Crosse WI
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Chilled-WaterSystems
One of the Systems Series
The Trane Company
Chilled-WaterSystems
One of the Systems Series A publication of
A Trane Air Conditioning Clinic
Preface
Chilled-WaterSystems
period two Chilled-WaterSystem Design
Contents
period three
period four
TRG-TRC016-EN
period one
notes
Types of Water Chillers
Types of Water Chillers
Driving Sources
period one
notes
Types of Water Chillers
notes
Vapor-CompressionCycle
Types of Water Chillers
period one
notes
Compressor Types
Types of Water Chillers
period one
notes
Variable-SpeedDrives
Types of Water Chillers
period one
Air-Cooledor Water-Cooled
Condenser Types
notes
Types of Water Chillers
Tower maintenance Freeze protection Makeup water
Maintenance
notes
Types of Water Chillers
notes
Low Ambient Operation
Types of Water Chillers
period one
notes
Efficiency
Types of Water Chillers
period one
notes
Comparison
Types of Water Chillers
period one
notes
Packaged Air-CooledChiller
Types of Water Chillers
period one
notes
Remote Evaporator Barrel
Types of Water Chillers
period one
notes
Remote Air-CooledCondenser
Types of Water Chillers
period one
notes
Indoor Air-CooledCondenser
Types of Water Chillers
period one
notes
Absorption Refrigeration Cycle
Types of Water Chillers
period one
Waste heat recovery Cogeneration
Absorption Chillers Offer Choice
notes
Types of Water Chillers
notes
Absorption Chiller Types
Types of Water Chillers
period one
notes
Equipment Rating Standards
Types of Water Chillers
period one
notes
Part-LoadEfficiency Rating
Types of Water Chillers
period one
notes
Standard Rating Conditions
Types of Water Chillers
period one
notes
Flow Rates and Temperatures
Types of Water Chillers
period one
notes
Flow Rates and Temperatures
Types of Water Chillers
period one
Electric Vapor-CompressionChillers
ASHRAE/IESNA Standard 90.1–1999
notes
Types of Water Chillers
notes
Water-CooledAbsorption Chillers
Types of Water Chillers
period one
Safety standard for refrigerating systems
ASHRAE Standard 15–1994
notes
Types of Water Chillers
Chilled-WaterSystem Design
period two
Chilled-WaterSystem Design
period two
Chilled-WaterSystem
period two
notes
Chilled-WaterSystem Design
notes
Load-TerminalControl Options
Chilled-WaterSystem Design
period two
notes
Three-WayValve Control
Chilled-WaterSystem Design
period two
notes
Two-WayValve Control
Chilled-WaterSystem Design
period two
notes
Face-and-BypassDamper Control
Chilled-WaterSystem Design
period two
notes
Chiller Evaporator Flow
Chilled-WaterSystem Design
period two
notes
Single-ChillerSystem
Chilled-WaterSystem Design
period two
notes
Multiple-ChillerSystems
Chilled-WaterSystem Design
period two
Parallel Configuration
Single Pump
notes
Chilled-WaterSystem Design
notes
Dedicated Pumps
Chilled-WaterSystem Design
period two
notes
Figure 43 shows an example of the pump–systemcurve relationship. When both pumps are operating, the system receives 100 percent of design flow. When only one pump is operating, the intersection of the pump’s performance curve with the system curve results in about 65 percent of design flow
Chilled-WaterSystem Design
period two
Series Configuration
Chillers Piped in Series
notes
Chilled-WaterSystem Design
notes
Equal Set Points
Chilled-WaterSystem Design
period two
notes
Staggered Set Points
Chilled-WaterSystem Design
period two
Primary-SecondaryDecoupled Configuration
Primary-SecondaryConfiguration
Chilled-WaterSystem Design
period two
notes
Primary-SecondarySystem Rules
Chilled-WaterSystem Design
period two
notes
Production Loop
Chilled-WaterSystem Design
period two
notes
Manifolded Production Pumps
Chilled-WaterSystem Design
period two
period two
Distribution Loop
Chilled-WaterSystem Design
Chilled-WaterSystem Design
notes
period two
Primary-SecondarySystem Rules
notes
Varying Distribution Flow
Chilled-WaterSystem Design
period two
notes
Multiple Distribution Pumps
Chilled-WaterSystem Design
period two
notes
A variation of the multiple-pumpconfiguration is to use separate pumps to deliver water to specific, dedicated loads. An example is a chilled-watersystem serving a college campus. Separate distribution pumps supply water to the east A, west B, and central C portions of the campus. A primary advantage of this configuration is flexibility. Expanding the system can be achieved by simply adding another distribution pump to the existing plant and connecting it to the piping that runs to the new building
Chilled-WaterSystem Design
period two
notes
Tertiary Pumping
Chilled-WaterSystem Design
period two
Higher return-watertemperatures
Distribution Loop Characteristics
notes
Chilled-WaterSystem Design
Chilled-WaterSystem Design
notes
period two
Primary-SecondarySystem Rules
notes
System Operation
Chilled-WaterSystem Design
period two
notes
Deficit Flow
Chilled-WaterSystem Design
period two
notes
Excess Flow
Chilled-WaterSystem Design
period two
notes
Control of Primary-SecondarySystem
Chilled-WaterSystem Design
period two
Chilled-WaterSystem Design
Types of Fluid Flow Meters
period two
Pressure-based
notes
Temperature-BasedCalculations
Chilled-WaterSystem Design
period two
System Variations
period three
System Variations
period three
Fuel Choice Options
period three
System Variations
absorption thermal storage
System Variations
Chiller Efficiency Improvements
period three
Low-FlowSystems
Trend Toward Lower Flow Rates
Greater Focus on System Efficiency
notes
System Variations
notes
Low-FlowSystems
System Variations
period three
notes
Variable-Primary-FlowSystems
System Variations
period three
notes
Critical VPF System Requirements
System Variations
period three
notes
Preferential Chiller Loading
System Variations
period three
notes
Sidestream Configuration
System Variations
period three
Heat Recovery
Heat-RecoveryChiller
notes
System Variations
notes
Heat-RecoveryChiller Options
System Variations
period three
notes
Heat-RecoveryChiller Efficiency
System Variations
period three
notes
Control of a Heat-RecoveryChiller
System Variations
period three
notes
Asymmetric Design
System Variations
period three
notes
Swing Chiller
System Variations
period three
System Variations
notes
period three
Swing Chiller
notes
“Free” Cooling
System Variations
period three
notes
Plate-and-FrameHeat Exchanger
System Variations
period three
notes
Refrigerant Migration
System Variations
period three
notes
Application Outside Range of Chiller
System Variations
period three
Chiller-PlantControl
period four
Chiller-PlantControl
period four
Chiller Controls
period four
Start–stop Chilled-watertemperature control
notes
When to turn a chiller on or off
What Is Important?
How to recover from an equipment failure
How to optimize system efficiency
notes
Chiller Sequencing
Chiller-PlantControl
period four
notes
Temperature
Chiller-PlantControl
period four
notes
Flow
Chiller-PlantControl
period four
notes
Capacity
Chiller-PlantControl
period four
notes
Chiller Rotation
Chiller-PlantControl
period four
notes
When the system consists of chillers with different capacities, efficiencies, or fuel types, the question of which chiller to turn on or off next becomes more complex. Although each system requires a complete analysis, there are some general principles that apply to most systems
Chiller-PlantControl
period four
preferentially-loaded heat-recoverychiller
Heat Recovery
notes
Chiller-PlantControl
notes
The variable-primary-flowsystem, introduced in Period Three, is designed to operate with variable flow through the chiller evaporators. Sequencing chillers in this type of system cannot be based solely on temperature, because in a properly-operatingsystem the supply- and return-watertemperatures will be nearly constant. Determining when to turn chillers on or off is not a simple task. For control stability and chiller reliability, the flow rates through the chillers, and the rate of flow change, must be kept within allowable ranges
Chiller-PlantControl
period four
Failure Recovery and Contingency Planning
System Failure Recovery
notes
Chiller-PlantControl
notes
Contingency Planning
Chiller-PlantControl
period four
System Tuning
System Timers
Load-confirmationtimer
Staging-intervaltimer
notes
Unload Before Start
Chiller-PlantControl
period four
notes
Soft Loading
Chiller-PlantControl
period four
notes
Chilled-WaterSet Point Control
Chiller-PlantControl
period four
notes
System Optimization
Chiller-PlantControl
period four
notes
Chilled Water Reset
Chiller-PlantControl
period four
notes
Condenser-WaterTemperature
Chiller-PlantControl
period four
period four
Control of Condensing Pressure
Chiller-PlantControl
notes
Operator Training and Support
Chiller-PlantControl
period four
notes
Operator Interface
Chiller-PlantControl
period four
notes
ASHRAE Guideline
Chiller-PlantControl
period four
Review
period five
Review
period five
Review—PeriodTwo
period five
Parallel configuration Series configuration
notes
Heat recovery Asymmetric design
Review—PeriodThree
notes
Review
Chiller sequencing Failure recovery
Review—PeriodFour
Contingency planning System tuning
notes
period five
Review
nASHRAE Handbook – Refrigeration
nASHRAE Handbook – Systems and Equipment
Questions for Period
Quiz
Questions for Period
Quiz
9Why does a variable-primary-flowVPF system require a bypass in the system?
Questions for Period
Questions for Period
Answers
12Sequencing 13Decreases; increases
Answers
Glossary
decoupled system See primary-secondarysystem
Glossary
Glossary
swing chiller A smaller-capacitychiller used in a multiple-chillersystem. It is alternated on and off between the larger chillers operation to serve as a smaller, incremental step of loading
notes
Glossary
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