ASHRAE Journal Supplement - AMCA International In Motion - Summer 2014 - (Page 20)

Inlet Box Damper Parallel Blades Diffuser (Evase) Inlet Box Cone Type Variable Inlet Vanes Outlet Damper, Typical Configuration Figure 2. Fan accessories for rating purposes. Modified from AMCA inmotion (Fall 2013) Fans with open inlets are of special concern. The fan manufacturer should be given important details such as the location of walls, ceilings and walkways around the fan. Silencers with screens and rain hoods can be designed to direct noise away from these features. The addition of silencers in the airstream will increase systems losses and will factor into the fan size selected. There are many things outside the control of the fan manufacturer. For example, if there are concerns about explosions or implosions, special quick-closing dampers may be needed. Additional bracing maybe required in such cases as well. If the fan is being supplied as an upgrade to an existing installation, duct stiffening and duct design should be examined to ensure the increased pressure and flow will not result in unwanted sounds from duct flexing. Fan testing takes on many forms. As detailed in AMCA Publication 801, there are several tests available that give results and assurances in different areas. Overspeed tests verify the structural integrity of the rotors. Model tests can verify that the full scale fan will perform as designed, avoiding the natural frequencies requested and operating without unexpected response issues. Each of these tests can reassure the customer that their fan will perform reliably and provide significant returns on investment. 20 Summer 2014 For more information, consult AMCA's existing resources. AMCA Publication 801 contains a wealth of information that will guide understanding of fan design features and specification writing. AMCA Publication 802 and ANSI/AMCA Standard 803 cover laboratory model testing and full-size fan field testing relating to fans for industrial process and power generation applications. All three of these publications are available at no charge on AMCA's website. REFERENCES 1 AMCA International Industrial Process/Power Generation Group. "Selection of Fans for Industrial Process and Power Generation Applications." AMCA inmotion (Fall 2013):6-12. 2 AMCA International Industrial Process/Power Generation Group. "Performance and Reliability Assurance of Custom Engineered and Manufactured Fans for Industrial and Utility Applications." AMCA inmotion (Summer 2012):22-25. 3 AMCA 801-01 (R 2008), Industrial Process/Power Generation Fans: Specification Guidelines. Arlington Heights, IL: AMCA International, 2008. 4 Urone, Paul Peter and Roger Hinrichs. College Physics, p.569. Prod. OpenStax College. June 2012. Accessed April 15 2014. http://tinyurl.com/py5rlv4 A M C A I N T E R NAT I O NA L inmotion W W W. A M C A . O R G http://tinyurl.com/py5rlv4 http://WWW.AMCA.ORG

Table of Contents for the Digital Edition of ASHRAE Journal Supplement - AMCA International In Motion - Summer 2014

Contents

ASHRAE Journal Supplement - AMCA International In Motion - Summer 2014

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