ASHRAE Boston September Meeting

  • Tuesday, September 13, 2022
  • 5:30 PM - 8:00 PM
  • DoubleTree Suites by Hilton Hotel Boston - Cambridge


  • ASHRAE Boston Chapter member registering to attend.
  • Bring a non-member of the ASHRAE Boston Chapter to attend for free
  • Non-member of ASHRAE Boston Chapter registering to attend

Registration is closed

September 13, 2022

 ASHRAE Boston Meeting

5:30 - 8:00 PM

DoubleTree Suites by Hilton Hotel Boston - Cambridge

400 Soldiers Field Rd, Boston, MA 02134

Parking: $10

Event Fee

Members: $50

Students & Presenters: Free



5:30-6:30 Networking

5:30-6:15 Tech Session

6:30-7:00 Dinner

7:00-8:00 Main Presentation (1 PDH)

Topic: Steady on the Throttle - Part Load Compressor Technologies


Mark W. Fly, P.E.

Fellow & Distinguished Lecturer ASHRAE

Executive Director

Norman Asbjornson Innovation Center

AAON, Inc.

Topic Summary

There are many advantage of variable capacity compressors in both energy reduction and precision space temperature and humidity control. Several technologies are available to achieve variable compressor capacity modulation.  It is not surprising that ultimate in efficiency, true variable speed compressors, come with the most complex and least robust system of control and operation. Due to the parasitic energy use of variable speed drive devices, they are also less efficient at full speed by 3-5%. Both the digital and two step scroll compressor offer improved efficiency with reduced complexity in the areas of control and less long term equipment life issues regarding oil circulation or resonance issues in the equipment or building structure. This presentation will discuss how these technologies work as well as the efficiency and space control that can be achieved with each by: 

1.     Discovering why variable capacity control is desirable, necessary and critical to certain applications

2.     Understanding the different types of compressors that are most commonly used in unitary HVAC equipment

3.     Review the different methods of capacity modulation  and the pros and cons of each

4.     Analyze the different tradeoffs on each modulation type in terms of cost, precision, efficiency, control complexity, and equipment life 

Tech Session:

Failure is the Option - How failure, perseverance, and positive attitude lead to innovation and success

To invent, innovate and discover new concepts, processes or products we must push the boundaries of our knowledge and experience past where we are today. You cannot discover how far you can go without exceeding the limits and failing so that we know what the limits are. This presentation draws on the wisdom and experience of some the most innovative and successful figures currently and in history for wisdom on how to fail and win. This presentation will cover:

  • Realize how failure leads to successful outcomes
  • Know the difference between an acceptable and unacceptable failure
  • Discover how to "make your own luck" through perseverance
  • Understand how learning from others mistakes can make us more successful and allow us to learn from our own

Speaker Bio

Mark W. Fly, P.E has over 40 years of experience as a Researcher, Consulting Engineer, Contractor, and Manufacturer in the HVAC Industry. He is currently the Executive Director of the Norman Asbjornson Innovation Center & Laboratory, (NAIC) at AAON,Inc. in Tulsa, Oklahoma. He served as Director of Engineering of AAON for 11 years prior to taking that position. He holds a Bachelor of Science in Engineering Physics from Missouri State University and is a Licensed Professional Engineer in two states.

In ASHRAE, Mr. Fly holds the grade of Fellow and has been honored with both the Distinguished Service and Exceptional Service Awards. He has been and is currently active on numerous Technical Committees, Standing Committees and Councils, currently serving on the Publishing and Education Council and as a Trustee on the ASHRAE Foundation Board. He served as a Director at Large on the ASHRAE Board of Directors from 2014-2017. He has also been active in the HVAC Industry Trade Association, AHRI. Serving on the Board of Directors from 2012-2016 as Section Chair for Unitary Large Equipment, and Air-to-Air Energy Recovery, he has also participated on the AHRI Technical on Sound, Unitary Sector Leadership Council and is currently serving on the Systems Steering Committee

We hope you will join us!


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