SLIDES HERE: Mike Rogers HVAC to HomePerformance
RECORDED VERSION HERE
60+ minutes Instructor: Mike Rogers
HVAC To Home Performance
Are you running a residential HVAC business and looking for new ways to expand your business and increase revenue?
Are you interested in learning more about “Home Performance” to understand how your HVAC customers—and your business—would benefit from a more comprehensive approach to heating, ventilating, and air-conditioning?
This session will provide HVAC contractors an overview of the enormous opportunity the exists in incorporating home performance into an HVAC company, and share key concepts to help you evaluate if home performance is the right next step to grow your business.
Intended Participants: HVAC business owners, managers, and key personnel
Home Performance Overview
The Market Opportunity for Home Performance
Margins, Costs, and Profitability—The Numbers
Is this right for me?
Presenter Mike Rogers is a nationally recognized expert in home performance contracting. Previously, he was Senior Vice President at GreenHomes America. a leading home performance contractor and franchisor, and led development of the GreenHomes business. He has extensive experience in home performance contracting, from individual homes to the state and federal level. For 15 years he has been a frequent presenter at national conferences and meetings in the energy-efficiency, green building, and indoor air quality industries. Mike had an 11-year affiliation with the U.S. EPA as an employee and consultant, where he was a lead developer and primary supporter of the Home Performance with ENERGY STAR (HPwES) program.
Jim Bergmann’s passion for correctly measuring air flow is evident in this piece!
Measuring Air Flow Tips and Techniques
Technicians and manufactures have long struggled with issues of airflow and airflow measurement. Due to the time-intensive nature of many measurement procedures and the limited tool selection of the technician, it has been common to use gross airflow estimation methods that are uncorrected. The temperature rise method, total external static method, pressure drop across filters or coils all examples of gross airflow estimation methods and many times are adequate for the equipment commissioning procedure, however if the desire is to evaluate equipment performance, a more accurate method is required.
The most common and easiest way to measure or with some methods estimate and set airflow is to use one of the following methods:
- Rotating Vane Anemometer (Measurement, mid airflow range)
- Pressure drop across the dry evaporator coil (estimate)
- Total external static pressure method (estimate)
- Pitot tube and digital manometer (Measurement, full range airflow measurement, however low range requires special instrumentation.)
- Velocity Stick (Hot Wire Anemometer) (Measurement, very low to mid airflow)
- The temperature rise method (Sensible heat formula) (estimate)
- RPM and manufacturers fan curve (Belt or VF Drive) (close estimate based from fan curve, however limited by accuracy of static pressure measurement)
- Wilson Grid (TruFlow® Grid) (estimated pressure drop measurement method)
The airflow must first be set according to the equipment design not to the air delivered at the registers. While the design of the duct system is imperative for proper air distribution to the conditioned space, air measurements are only to be measured at the appliance for the equipment commissioning procedure. Due to leakage inherent with all ducting systems, airflow cannot be measured at the registers to verify correct airflow across an evaporator coil or heat exchanger. The problem is not with the operation of the equipment if the system will not heat or cool the home after the airflow is properly set at the appliance and the equipment operation is verified to be correct. The ducting system should then be evaluated for excessive leakage, proper sizing and proper design. A review of the heat load calculation may be required to verify the equipment selection was correct if the system still will not perform properly. Read More about measuring by specific method…