Fan Efficiency Grades--Overcoming Energy Challenges

Fans account for a large amount of the energy consumed in HVAC systems.  According to Michael Ivanovich--director of strategic energy initiatives for the Air Movement Control Association (AMCA) International,  fans account for 80% of the so-called parasitic load--that is HVAC loads other than prime movers like chillers and boilers.

Selecting fans to reduce energy waste has been difficult in the past, as there were no universal fan selection guides and metrics.   In 2007, AMCA international began working to develop a fan efficiency classification system, called the Fan Efficiency Grade (FEG).  It was formalized with the publication of AMCA 205 in 2010

What is a Fan Efficiency Grade

AMCA defines FEG as "a numerical rating that classifies fans by their aerodynamic ability to convert mechanical shaft power, or impeller power in the case of a direct driven fan to air power."  This allows engineers to more easily differentiate between fan models. The higher FEG ratings, the more efficient the fan model. 

Why FEG Matters 

It is important to understand the nature of FEGs, because these efficiency grades, essentially an index of inherent aerodynamic quality, are referenced in last year's international Green Construction Code (IGCC), and the 2013 update of ASHRAE 90.1.

It is likely more will adopt the AMCA fan standards, as AMCA members begin to work with 2015 International Energy Conservation Code (IECC) language and members of the SHARE 189.1 committee.

Reference:

AMCA "Fan Industry-Facing up the Energy Challenges" 

Benefits of Green Building

The green building phenomenon is sweeping across the world, but many doubt the benefits of this movement.

Instead, they believe it is simply a political agenda or a means for more costly construction projects.

The reality is, a green building project can have environmental, economic and social benefits as described below: 

Environmental Benefits 

• Emission Reductions--Green building techniques such as solar powering and daylighting can increase energy efficiency and reduce harmful emissions.
• Water Conservation-Implementing water recycle programs for urinal flow and irrigation can significantly lower water consumption and increase savings.
• Temperature Moderation-Conscientious building designs and site selection can reduce the urban heat island effect caused the heat retention properties of tall buildings and urban materials.

Economic Benefits

• Energy & Water Saving- Green design and technology can drastically reduce operation costs. This can offset any additional project costs, while offering long-term savings. 
• Increased Property Advantages-Low operating costs that come with green facilities can lead to lower vacancy rates and higher property values.
• Increase Employee Productivity & Health-There is a positive correlation between indoor environmental conditions and improved employee health and productivity. 
• Sales Improvements-Studies show stores with more natural light have more sales. 

Social Benefit 

• Improved Health-Poor indoor environment quality can contribute to respiratory problems, allergies, and nausea headaches. Implementing green building features can provide for a healthier and more comfortable living and working environment.  
•  Improved schools-About 40% of the schools in the United States are subject to poor environmental conditions that can affect the health and learning of students.  Studies show that schools utilizing green building techniques often experience a reduction in student absentees and see an improvement in test scores. 
• Healthier Lifestyles & Recreation- Sustainable designs preserve natural environments and provide for more recreation and exercise opportunities. They also promote alternatives to driving such as bicycling and public transport.