Download Trane ENL All-Variable-Speed Chilled-Water Plants Presentaion Handout PDF

TitleTrane ENL All-Variable-Speed Chilled-Water Plants Presentaion Handout
File Size2.9 MB
Total Pages68
Table of Contents
                            Agenda
Presenter biographies
All-Variable-Speed Chilled-Water Plants
                        
Document Text Contents
Page 1

Trane Engineers Newsletter Live

All-Variable-Speed Chilled-Water Plants
Presenters: Mick Schwedler, Lee Cline, Susanna Hanson, Jeanne Harshaw (host)

Handout_cover.ai 1 9/6/2013 8:47:30 AM

Page 2

Agenda

Trane Engineers Newsletter Live Series

All-Variable-Speed Chilled-Water Plants

Abstract
Variable frequency drives (VFDs) are being used on all chilled-water system components (fans, pumps,
and chillers), and for good reason. When systems are properly designed and controlled, they offer the opportunity
for significant energy savings as well as improved operation. With these new opportunities
come new complexities. This ENL discusses all variable-speed chilled-water system design and control. Discussion
will include individual component and system performance as well as system design options and control.

Presenters: Trane applications engineers Lee Cline, Susanna Hanson and Mick Schwedler.

After attending you will be able to:
• Build the case for variable speed to be used in the context of broader chiller plant design objectives –
understanding that it’s not a one size fits all.
• Identify energy saving opportunities in various chilled water plants
• Summarize control options and their energy and complexity impact, regardless of the planned chiller plant design
• Summarize the impact of operating on the edges of the safe operating envelope.
• Summarize limit protection mode considerations and the importance of incorporating into the control system.

Agenda
History of VSD use in chiller plant operation
a) Potential efficiency of chiller plants (various configurations)
b) VSDs impact on HVAC components
c) Existing system review
System configuration examples - what’s the payoff?
All variable-speed chiller plant operation
a) Understanding of control options and their energy and complexity impact,
regardless of the planned chiller plant design
b) Importance of incorporating limit mode into the control system
User interaction
Application to existing systems
Resources

PresenterAgenda_APPCMC049.ai 1 9/6/2013 8:55:10 AM

Page 34

© 2013 Trane, a business of Ingersoll-Rand61

 Tower fan control is absolutely
critical to save energy when
variable speed chillers are
installed

 Optimal tower fan control saves
significant energy (III)

What Did We Learn?

© 2013 Trane, a business of Ingersoll-Rand62

2 gpm/ton Condenser Flow
Annualized System Performance

System Performance
(Annualized kW/ton)

Chiller
Type

Cooling
Tower

Fan

Cond
Water

Flow Rate
(gpm/ton)

Cond
Water

Flow Type

Tower
Control
Method

CS 1 Spd 3 CF 85°F

CS 1 Spd 3 CF Opt

CS VS 3 CF 85°F

CS VS 3 CF Opt

VS VS 3 CF 85°F

VS VS 3 CF Opt

VS VS 2 CF Opt

0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1

1 chiller
2 chillers
3 chillers

Trane Engineers Newsletter LIVE: All-Variable-Speed Chilled-Water Plants

©2013 Trane a business of Ingersoll Rand APP-CMC049-EN 34

Page 35

© 2013 Trane, a business of Ingersoll-Rand63

 Proper condenser water design flow
rate is very important

 Taylor (ASHRAE Journal December 2011)
 Condenser water:

“…life cycle costs were minimized at the
largest of the three ∆Ts analyzed, about
15ºF. This was true for office buildings and
datacenters and for both single-stage
centrifugal chillers and two-stage
centrifugal chillers.”

What Did We Learn?

© 2013 Trane, a business of Ingersoll-Rand64

3 gpm/ton Variable Condenser Flow
Annualized System Performance

System Performance
(Annualized kW/ton)

Chiller
Type

Cooling
Tower

Fan

Cond
Water

Flow Rate
(gpm/ton)

Cond
Water

Flow Type

Tower
Control
Method

CS 1 Spd 3 CF 85°F

CS 1 Spd 3 CF Opt

CS VS 3 CF 85°F

CS VS 3 CF Opt

VS VS 3 CF 85°F

VS VS 3 CF Opt

VS VS 2 CF Opt

VS VS 3 VF Opt

0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1

1 chiller
2 chillers
3 chillers

Trane Engineers Newsletter LIVE: All-Variable-Speed Chilled-Water Plants

©2013 Trane a business of Ingersoll Rand APP-CMC049-EN 35

Page 67

© 2013 Trane, a business of Ingersoll-Rand127

Past programs include:

• Air-to-Air Energy Recovery
• ASHRAE Standards 189.1, 90.1, 62.1
• High-performance VAV Systems
• Chilled-water plants
• WSHP/GSHP systems
• Control strategies
• USGBC LEED®

• Energy and the environment
• Acoustics
• Ventilation
• Dehumidification
• Ice storage
• Central geothermal systems

www.trane.com/ENL

© 2013 Trane, a business of Ingersoll-Rand128

LEED Continuing Education Courses
on-demand, no charge, 1.5 CE credits

 ASHRAE Standards 62.1 and 90.1 and VAV Systems

 ASHRAE Standard 62.1: Ventilation Rate Procedure

 ASHRAE Standard 90.1-2010

 ASHRAE Standard 189.1-2011

 High-Performance VAV Systems

 Single-Zone VAV Systems

 Ice Storage Design and Control

 Energy Saving Strategies for WSHP/GSHP Systems

www.trane.com/ContinuingEducation

Trane Engineers Newsletter LIVE: All-Variable-Speed Chilled-Water Plants

©2013 Trane a business of Ingersoll Rand APP-CMC049-EN 67

Page 68

© 2013 Trane, a business of Ingersoll-Rand129

Join Us in 2014

 LEED v4

 Applying Variable Refrigerant Flow (VRF)

 Energy-saving Strategies for Chilled-water Terminal
Systems

All-Variable-Speed Chilled-Water Plants

Trane Engineers Newsletter LIVE: All-Variable-Speed Chilled-Water Plants

©2013 Trane a business of Ingersoll Rand APP-CMC049-EN 68

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