Fan Law 2 for Techs w/ Adam Mufich Podcast Por capa

Fan Law 2 for Techs w/ Adam Mufich

Fan Law 2 for Techs w/ Adam Mufich

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 In this educational session, Adam from National Comfort Institute (NCI) delivers a comprehensive deep dive into Fan Law 2 and its practical applications for residential HVAC systems at the 6th Annual HVACR Training Symposium. Adam begins by establishing the fundamental concepts of CFM (cubic feet per minute) and static pressure, explaining how these measurements relate to system performance. He shares a humbling personal story about learning to measure gas pressure from a homeowner, emphasizing that even experienced technicians can benefit from understanding basic measurement principles. The presentation focuses heavily on Fan Law 2, which allows technicians to predict how changes in airflow will affect static pressure in a non-proportional relationship - a critical concept for equipment sizing and replacement decisions. The core of the presentation revolves around practical applications of Fan Law 2 in real-world scenarios. Adam demonstrates how to calculate pressure drops across filters, evaporator coils, and entire duct systems when airflow changes occur. He emphasizes that static pressure increases exponentially when airflow increases, which explains why oversized systems often perform poorly. Through detailed examples using actual field measurements, he shows how a 16% increase in airflow can result in a 33% increase in static pressure, highlighting the importance of proper system sizing. Perhaps most importantly, Adam presents a systematic approach to equipment selection that goes beyond simply matching tonnage. He demonstrates how contractors can "back into" total external static pressure calculations by carefully selecting low-pressure-drop components like evaporator coils and filters. This methodology allows technicians to predict system performance before installation, preventing the common scenario where new equipment sounds "like a rocket ship" due to excessive static pressure. The presentation concludes with a compelling comparison showing how proper component selection can reduce system static pressure from over 1.0 inches to 0.64 inches while maintaining the same capacity and airflow. Topics Covered Static Pressure Fundamentals Definition and measurement using manometersInches of water column explainedRelationship between static pressure and system performance Fan Law 2 Mathematics Breaking down the intimidating formula into simple termsStep-by-step calculation examplesCommon mistakes when squaring numbers in calculations Practical Applications Filter pressure drop calculations at different airflowsEvaporator coil pressure drop analysisTotal External Static Pressure (TESP) predictionsDuct system pressure calculations Equipment Selection Strategy How to select evaporator coils based on pressure drop ratingsFilter sizing for optimal pressure dropUsing manufacturer data sheets effectivelyAHRI matchup considerations beyond just capacity Real-World Problem Solving Preventing "rocket ship" installationsRetrofitting existing systems with proper calculationsDownsizing benefits for static pressure reductionSystem commissioning and performance verification Professional Development Moving beyond equipment replacement guessworkUsing measurement tools like True Flow GridUnderstanding manufacturer specificationsElevating installation quality through proper system design Have a question that you want us to answer on the podcast? Submit your questions at https://www.speakpipe.com/hvacschool. Purchase your tickets or learn more about the 7th Annual HVACR Training Symposium at https://hvacrschool.com/symposium. Subscribe to our podcast on your iPhone or Android. Subscribe to our YouTube channel. Check out our handy calculators here or on the HVAC School Mobile App for Apple and Android
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