Engineers Newsletter

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Trane Engineers Newsletters are topical, informative articles that provide engineering professionals who design HVAC systems with reliable, objective, and technologically current information in a non-commercial format.

For 50 years, these newsletters have been published by Trane Applications Engineering group to aid engineers in the design and application of HVAC systems. Subjects range from acoustics to water piping to interpretation of ASHRAE standards. These newsletters have become a trusted technical resource, with a current circulation of more than 40,000.

Read the latest Trane Engineers Newsletter:

Standards and Codes and Wizards...Oh My!

This Engineers Newsletter aims to add clarity on United States codes and standards, discuss the typical steps engineers take to review building HVAC system designs against building regulations, and suggest practices and tools that may simplify the internal review process.

2022 ENL Program Line Up

March: Applying VRF for a Complete Building Solution Part II

May: Decarbonization of HVAC Systems Part II

September: Air-to-Water Heat Pump Systems Design

November: Cooling and Heating with Energy Storage

VAV Systems and Open Ceilings

by Eric Sturm, 2021, volume 50-3
Understanding VAV Sound Standards

by Eric Sturm, 2018, volume 47-4
100 Years of Trane History

by Mick Schwedler and Eric Sturm, 2013, volume 42-1
Direct-Drive Plenum Fans and Fan Arrays

by Dustin Meredith, John Murphy, 2010, volume 39-1
Acoustical Considerations for Large Rooftop Units

by Dave Guckelberger, 2009, volume 38-2
A New Standard for Acoustics in the Classroom

by Dave Guckelberger, 2003, volume 32-1
Sound Ratings for ARI Standard 260P

by Dave Guckelberger, 2000, volume 29-1
Chilled-Water System Design Issues: Learning from Past Mistakes

by Mick Schwedler, 2014, volume 43-2
Specifying “Quality Sound”

by Dave Guckelberger, 1996, volume 25-3
Sound Propagation from Air-Cooled Chillers

by Dave Guckelberger, 1988, volume 17-3

Impact of DOAS Supply-Air Dew Point Temperature on Space Humidity

by John Murphy, vol 49-1
Indoor Agriculture: HVAC System Design Considerations

by E. Sturm, 2019, volume 48-3
Condensation in Air-Handling Systems

by B. Hafendorfer, 2017, volume 46-4
Evaluating Efficiency in Air-Moving Systems

by B. Coleman, D. Guckelberger, D. Meredith, 2017, volume 46-3
DOAS with Sensible-Cooling Terminal Units

by John Murphy, 2017, volume 46-2
AHRI 920-Rating Standard for DX Dedicated Outdoor-Air Units

by John Murphy, 2016, volume 45-4
Multiple-Zone VAV Systems-Finding the Right Balance for Energy Savings

by Eric Sturm, 2016, volume 45-3
Airside Economizers and ASHRAE Standard 90.1-2013

by Eric Sturm, 2015, volume 44-2
FANtastic! A Closer Look at Fan Efficiency Metrics

By Dustin Meredith, 2014, volume 43-3
Understanding Single-Zone VAV Systems

by John Murphy, 2013, volume 42-2
100 Years of Trane History

by Mick Schwedler and Eric Sturm, 2013, volume 42-1
Minimum Outdoor Airflow Using the IAQ Procedure

by Dennis Stanke, 2011, volume 40-3
Effects of Altitude on Psychrometric Calculations and Fan Selection

by Trane Applications Engineering, 2011, volume 39-4
Direct-Drive Plenum Fans and Fan Arrays

by Dustin Meredith and John Murphy, 2010, volume 39-1
Understanding Chilled-Beam Systems

by John Murphy, 2009, volume 38-4
Energy-Saving Control Strategies for Rooftop VAV Systems

by John Murphy, 2006, volume 35-4
Maintaining a Comfortable Environment in Places of Assembly

by Don Eppelheimer, 2006, volume 35-3
Keeping Cool with Outdoor Air: Airside Economizers

by Dennis Stanke, 2006, volume 35-2
CO2-Based Demand-Controlled Ventilation with ASHRAE Standard 62.1-2004

by John Murphy, 2005, volume 34-5
Advances in Desiccant-Based Dehumidification

by John Murphy, 2005, volume 34-4
Cooling-Coil Heat Transfer

by Don Eppelheimer, 2002, volume 31-1
Better Part-Load Dehumidification: It's Not a Pipe Dream

by John Murphy, 2004, volume 33-2
Addendum 62n Breathes New Life into ASHRAE Standard 62

by Dennis Stanke, 2004, volume 33-1
Using Carbon Dioxide for Demand-Controlled Ventilation

by John Murphy, 2002, volume 31-3
Commercial Building Pressurization

by Dennis Stanke, 2002, volume 31-2
Underfloor Air Distribution: Turning Air Distribution Upside Down

by Dennis Stanke, 2001, volume 30-4
Air-to-Air Energy Recovery: Energy-Conscious Design Ideas

by Dennis Stanke and John Murphy, 2000, volume 29-5
Design Tips for Effective, Efficient Dedicated Outdoor-Air Systems

by Dennis Stanke, 2001, volume 30-3
The Three E’s of Geothermal Heat Pump Systems

by Mick Schwedler PE, 2001, volume 30-2
Dehumidify with Constant-Volume Systems: It May Take More than You Think

by Dennis Stanke, 2000, volume 29-4
Cool Air Makes Good Sense

by Don Eppelheimer, 2000, volume 29-2
The Threefold Challenge of Ventilating Single-Duct VAV Systems

by Dennis Stanke, 1998, volume 27-1
Designing an ASHRAE 62-Compliant Ventilation System

by Dennis Stanke, 1995, volume 24-2
VAV System Optimization: Critical Zone Reset

by Dennis Stanke, 1991, volume 20-2
The Coil Run-Around Cycle

1974, volume 3-3

100 Years of Trane History

by Mick Schwedler and Eric Sturm, 2013, volume 42-1
Short-Circuit Current Rating Update

by Dave Guckelberger, 2012, volume 41-2
Energy-Saving Control Strategies for Rooftop VAV Systems

by John Murphy, 2006, volume 35-4
How VFDs Affect Genset Sizing: Appearances Can Be Deceiving

by Court Nebuda, 2006, volume 35-1
Brushless DC Motors: Setting a New Standard for Efficiency

by Dave Guckelberger, 2004, volume 33-4
Intelligent Building Design: Investing in Interoperability

by Mark Hess, 2000, volume 29-3
Protecting the Electrical Distribution System: Short-Circuit Withstand Ratings Demystified

by Dave Guckelberger, 1998, volume 27-3

Understanding the Selection of Direct Expansion (DX) Evaporator Coils

by Paul Solberg, 2019, vol. 48-4
AHRI 920-Rating Standard for DX Dedicated Outdoor-Air Units

by John Murphy, 2016, volume 45-4
100 Years of Trane History

by Mick Schwedler and Eric Sturm, 2013, volume 42-1
Energy-Saving Strategies for Water-Source Heat Pump Systems

by John Murphy, 2007, volume 36-2
Energy-Saving Control Strategies for Rooftop VAV Systems

by John Murphy, 2006, volume 35-4
Split DX: Make Sure it's the Right Choice

by Paul Solberg, 2004, volume 33-3
Hot Gas Bypass: Blessing or Curse?

by Paul Solberg, 2003, volume 32-2
The Three E's of Geothermal Heat Pump Systems

by Mick Schwedler PE, 2001, volume 30-2
Split Systems and Interconnecting Refrigerant Lines: As Equipment Evolves, so Must Piping Practices

by Paul Solberg, 1998 (revised Oct 2001), volume 27-4
The DX Refrigerant Cooling Coil Conundrum

1988, volume 17-1

Harmonic Distortion in Electrical Systems

by Dave Guckelberger and Bob Coleman, 2018, 47-1
ASHRAE Standard 90.1-2013: HVAC and Power Section Highlights

by Susanna Hanson, volume 44-1
LEED v4

by Chris Hsieh and Jeanne Harshaw, 2014, volume 43-1
HVAC Refrigerants: A Balanced Approach

by Jeff Moe and Mike Thompson, 2011, volume 40-2
Green Progress, Change for the Better—LEED® 2009

by Mick Schwedler, 2009, volume 38-1
Energy-Saving Strategies for LEED® Energy and Atmosphere Credit 1 (EAc1)

by John Murphy, 2008, volume 37-2
Top Ten Frequently Asked Questions on HVAC and LEED®

by Chris Hsieh, 2007, volume 36-4
Ice Storage as Part of a LEED® Building Design

by Paul Solberg, 2007, volume 36-3
Energy-Saving Strategies for Water-Source Heat Pump Systems

by John Murphy, 2007, volume 36-2
Energy-Saving Control Strategies for Rooftop VAV Systems

by John Murphy, 2006, volume 35-4
Model for Success: Energy Analysis for LEED® Certification

by Christian Taber, 2005, volume 34-3
The Refrigerant Opportunity: Save Energy AND the Environment

by Chris Hsieh, 2005, volume 34-2. PDF
Green, Growing, Here to Stay: Energy and Environmental Initiatives

by Chris Hsieh, 2003, volume 32-1

Standards and Codes and Wizards...Oh My!

by Rick Heiden and Caitlin Bohnert, 2021, volume 50-4
HVAC-Related Changes to ASHRAE 90.1-2019

by Rick Heiden, 2020, volume 49-4
ASHRAE® Guideline 36

by John Murphy, 2021, volume 50-2
ASHRAE® Standard 62.1-2019 Update

by John Murphy, 2020, volume 49-3
Updated ASHRAE® Recommendations for COVID-19

by John Murphy, 2021, volume 49-2
Selecting Chilled-Water Coils for ASHRAE 90.1’s New 15°F Delta T Requirement

by John Murphy, 2019, volume 48-2
ASHRAE Standard 90.1-2016: HVAC-Related Updates

by Susanna Hanson, 2018, Vol. 47-2
Evaluating Efficiency in Air-Moving Systems

by B. Coleman, D. Guckelberger, D. Meredith, 2017, volume 46-3
ASHRAE Standard 189.1-2014

by Chris Hsieh, 2017, volume 46-1
AHRI 920-Rating Standard for DX Dedicated Outdoor-Air Units

by John Murphy, 2016, volume 45-4
Airside Economizers and ASHRAE Standard 90.1-2013

by Eric Sturm, 2015, volume 44-2
ASHRAE Standard 90.1-2013: HVAC and Power Section Highlights

by Susanna Hanson, 2015, volume 44-1
FANtastic! A Closer Look at Fan Efficiency Metrics

by Dustin Meredith, 2014, volume 43-3
Understanding Single-Zone VAV Systems

by John Murphy, 2013, volume 42-2
Short-Circuit Current Rating Update

by Dave Guckelberger, 2012, volume 41-2
ASHRAE Standard 189.1-2011

by Dennis Stanke, 2012, volume 41-1
ASHRAE Standard 90.1-2010-Updates to Mechanical System Mandatory and Prescriptive Requirements

by Susanna Hanson, 2010, volume 39-3
Minimum Outdoor Airflow Using the IAQ Procedure

by Dennis Stanke, 2011, volume 40-3
Potential ASHRAE Standard Conflicts - Indoor Air Quality and Energy Standards

by Dennis Stanke, 2008, volume 37-4
ASHRAE Standard 15 Applied to Packaged, Split and VRF Systems

by Dave Guckelberger, 2008, volume 37-1
Keeping Cool with Outdoor Air: Airside Economizers (ASHRAE 90.1)

by Dennis Stanke, 2006, volume 35-2
CO2-Based Demand-Controlled Ventilation with ASHRAE Standard 62.1-2004

by John Murphy, 2005, volume 34-5
Addendum 62n Breathes New Life into ASHRAE Standard 62

by Dennis Stanke, 2004, volume 33-1
90.1 Ways to Save Energy: ASHRAE/IESNA 90.1—1999 Update

by Mick Schwedler PE, 2001, volume 30-1
The Tortuous Path from Industry Standard to Local Code

by Dave Guckelberger, 1999, volume 28-2
What Every Designer Should Know About ASHRAE Guideline 3-1996

by Bob Roth, 1998, volume 27-2
ARI Standard 550/590-1998: Implications for Chilled-Water Plant Design

by John Murphy and Andy Poselenzny, 1999, volume 28-1
The Threefold Challenge of Ventilating Single-Duct VAV Systems (ASHRAE 62)

by Dennis Stanke, 1998, volume 27-1
ASHRAE Standard 62-1989R Expands Responsibility for IAQ

by Dennis Stanke, 1996, volume 25-4
Designing an ASHRAE 62-Compliant Ventilation System

by Dennis Stanke, 1995, volume 24-2
ASHRAE 62-89 Analysis (Part 3): Indoor Air Quality Procedure

by Dennis Stanke, 1993, volume 22-2
Refrigeration System Equipment Room Design

by Dave Guckelberger, 1992, volume 21-2
ASHRAE 62-89 Analysis (Part 2): Ventilation Rate Procedure

by Dennis Stanke, 1993, volume 22-1
ASHRAE 62-89 Analysis (Part 1): General Requirements

by Dennis Stanke, 1992, volume 21-3

Pressure-Independent Control Valves

by Susanna Hanson, 2021, volume 50-1
What Drives Chiller Efficiency

by Michael Patterson, 2019, volume 48-1
Chilled-Water System Design Decisions

by Trane Applications Engineering, volume 47-3
Waterside Economizers: Keeping the "Free" in Free Cooling

by Susanna Hanson
Condenser-Water System Retrofit Opportunities

by Mick Schwedler and Jeanne Harshaw, 2016, volume 45-1
Chiller Selection Made Easier with myPLV™

by Brian Sullivan and Jeanne Harshaw, 2015, volume 44-4
Dual-Temperature Chiller Plants

by John Murphy, 2015, volume 44-3
Chilled-Water System Design Issues: Learning from Past Mistakes

by Mick Schwedler, 2014, volume 43-2
The Impact of VSDs on Chiller Plant Performance

by Lee Cline and Brian Sullivan, 2013, volume 42-4
The Impact of Variable-Speed Drives on HVAC Components

By Eric Sturm and Susanna Hanson, volume 42-3
100 Years of Trane History

by Mick Schwedler and Eric Sturm, 2013, volume 42-1
Condenser Water System Savings: Optimizing Flow Rates and Control

by Mick Schwedler, 2012, volume 41-3
Commercial Geothermal is Heating Up!

by Lee Cline, 2011, volume 40-1
Understanding Chilled Beam Systems

by John Murphy, 2009, volume 38-4
Series Chillers and Variable Primary Flow (VPF) Chiller Plants

by Lee Cline, 2009, volume 38-3
"Free" Cooling Using Water Economizers

by Susanna Hanson, 2008, volume 37-3
Ice Storage as Part of a LEED® Building Design

by Paul Solberg, 2007, volume 36-3
Waterside Heat Recovery

by Mick Schwedler, 2007, volume 36-1
Selecting Cooling Towers for Efficiency: Range or Approach?

by Don Eppelheimer, 2005, volume 34-1
Don't Overlook Optimization Opportunities in "Small" Chilled-Water Systems

by Don Eppelheimer, 2003, volume 32-4
Variable-Primary-Flow Systems Revisited

by Mick Schwedler PE, 2002, volume 31-4
Chilled-Water Plants and Asymmetry as a Basis of Design

by Don Eppelheimer, 1999, volume 28-4
An Idea For Chilled-Water Plants Whose Time Has Come… Variable-Primary-Flow Systems

by Mick Schwedler PE, 1999, volume 28-3
How Low-Flow Systems Can Help You … Give Your Customers What They Want

by Mick Schwedler PE, 1997, volume 26-2
Terminal Unit Systems and the Danger of “Oversizing” Heating Coils

by William Landman, 1997, volume 26-1
“Off-Design” Chiller Performance

by William Landman, 1996, volume 25-5
How Can This Be? (Chiller Efficiency)

by William Landman, 1996, volume 25-1
Tower Water Temperature ... Control it how?

by Mick Schwedler PE, 1995, volume 24-1
Gas Chillers: The Right COP

1992, volume 21-1
Two Good Old Ideas (primary/secondary pumping and heat recovery) Combine to Form One Great Idea

by William Landman, 1991, volume 20-1
A New Era of Free Cooling

by William Landman, 1991, volume 20-3
How Much Ice?

by Don Eppelheimer, 1990, volume 19-1
Chiller Plant System Performance

by Dave Guckelberger, 1989, volume 18-2
An Engineering Strategy for Ice Storage

by Don Eppelheimer, 1987, volume 16-6

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Acoustics

Airside Design

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Energy and Environment

Standards and Codes

Waterside Design