Fan controls don't measure up

The fan controls at an airport terminal had never been reviewed, and needed to be updated with variable frequency drives.

12/27/2013


During a recent inspection of the HVAC systems for a 1-million-sq-ft airport terminal, the exp U.S. Services team noticed the installation of inlet vanes on about 35 of the variable air volume (VAV) air handlers. This seemed particularly odd because the fans were only about 10 years old.

When the engineering team inquired about the installation, the client indicated it was a cost issue and that at the installation time the inlet vanes were a cheaper control method than variable frequency drives (VFDs). It seems that a proper design review by the CxA would have addressed this issue, and perhaps suggested a lifecycle cost analysis (LCCA) to show the actual operating costs of using the inlet vane controls versus VFD controls.

The recommendation: replace the inlet vanes with VFDs. Although a moderately costly option, the annual savings are 2,360,000 kWh and $127,000. As a bonus, the state is offering incentives of about $160,000, so the effective payback is around 3.7 years.


Terrence Malloy is project manager for the energy solutions group at exp US Services Inc. He focuses on energy conservation, retro-commissioning, and renewable energy systems.



Anonymous , 01/03/14 07:23 PM:

I fully agree with the VFD analysis and would add that when using a VFD, if you remove the IGVs then the fan energy efficiency will improve about the same as the drive insertion losses. Win-win for both sides!
SIVA , AL, India, 02/02/14 02:20 AM:

vfd is the best and now the only option for a client to get best results in most economical way.only thing consider the duct size
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
Each year, a panel of Control Engineering editors and industry expert judges select the System Integrator of the Year Award winners.
Control Engineering Leaders Under 40 identifies and gives recognition to young engineers who...
Learn more about methods used to ensure that the integration between the safety system and the process control...
Adding industrial toughness and reliability to Ethernet eGuide
Technological advances like multiple-in-multiple-out (MIMO) transmitting and receiving
Virtualization advice: 4 ways splitting servers can help manufacturing; Efficient motion controls; Fill the brain drain; Learn from the HART Plant of the Year
Two sides to process safety: Combining human and technical factors in your program; Preparing HMI graphics for migrations; Mechatronics and safety; Engineers' Choice Awards
Detecting security breaches: Forensic invenstigations depend on knowing your networks inside and out; Wireless workers; Opening robotic control; Product exclusive: Robust encoders
The Ask Control Engineering blog covers all aspects of automation, including motors, drives, sensors, motion control, machine control, and embedded systems.
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
News and comments from Control Engineering process industries editor, Peter Welander.
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
This is a blog from the trenches – written by engineers who are implementing and upgrading control systems every day across every industry.
Anthony Baker is a fictitious aggregation of experts from Callisto Integration, providing manufacturing consulting and systems integration.
Integrator Guide

Integrator Guide

Search the online Automation Integrator Guide
 

Create New Listing

Visit the System Integrators page to view past winners of Control Engineering's System Integrator of the Year Award and learn how to enter the competition. You will also find more information on system integrators and Control System Integrators Association.

Case Study Database

Case Study Database

Get more exposure for your case study by uploading it to the Control Engineering case study database, where end-users can identify relevant solutions and explore what the experts are doing to effectively implement a variety of technology and productivity related projects.

These case studies provide examples of how knowledgeable solution providers have used technology, processes and people to create effective and successful implementations in real-world situations. Case studies can be completed by filling out a simple online form where you can outline the project title, abstract, and full story in 1500 words or less; upload photos, videos and a logo.

Click here to visit the Case Study Database and upload your case study.