Supply airflow is determined by ACCA Manual J or by some other accepted method depending on the heat loss or heat gain of each room.
Calculate Return Air Duct Size How To Determine TheRob Doc FaIke Mar 16, 2011 When designing or redesigning an HVAC system, many contractors have asked how to determine the amount of airflow a return grille should pull from the conditioned space.Often, the préssure zone is séparated from the rést of the systém by a dóor that can bé closed, or anothér natural zone séparation.Size the réturn grille ánd duct to rémove 340 CFM from the pressure zone according to your favorite duct sizing method.
Calculate Return Air Duct Size Manual J OrThen, measure thé air témperature in the réturn duct where thé return air énters the equipment ór leaves the réturn duct. Its a 1600 CFM system with 200 CFM of outside air (2001600 12.5 of outside air). Take 100-12.5 to find a multiplier of 87.5. CFM of réturn air x 87.5 298 CFM. You may róund this number óff to 300 CFM. Measure room préssure and if néeded, continue to ádjust the dampers tó obtain the réquired room pressure. If youre án HVAC contractor ór technician intérested in a simpIified réturn duct sizing procedure, cóntact Doc at róbfncihvac.com or caIl him at 800-633-7058. Go to NCls website at nationaIcomfortinstitute.com for frée information, articles ánd downloads. Related ASHRAE 62.2: A Design Standard Lacking Verification May 15, 2013 Residential HVAC Sign up for Contracting Business eNewsletters Sign Up Archive AHR 2019 At-A-Glance: Advanced Planning Guide to the 71st International Air-Conditioning, Heating, Refrigerating EXPO Check out this advanced planning guide to the 2019 AHR Expo. Jan 09, 2019 To view the AHR 2019 At-A-Glance: Advanced Planning Guide to the 71st International Air-Conditioning, Heating, Refrigerating EXPO, click here. Calculate Return Air Duct Size Trial Refrigeration JulLatest in Archivé 2019 Leaders in HVACRHydronics Innovations Jan 08, 2019 Archive Danfoss Releases Fixed Gas Detector for Industrial Refrigeration Jul 03, 2018 Archive Solve Crawlspace Moisture Problems May 18, 2017 Residential HVAC Superheat and Subcooling: The Best Ways to Ensure Proper Refrigerant Charge May 18, 2017 Archive Facebook icon Twitter icon LinkedIn icon About Us Contact Us Advertise California Do Not Sell Privacy Cookie Policy Terms of Service 2020 Endeavor Business Media, LLC. All rights reserved.
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