March 2015 Program

The Wisconsin Chapter of ASHRAE is proud to announce our next chapter meeting on March 19th. Ryan Hoger, Director of Corporate Training for Temperature Equipment Corporation,  will be presenting on Rooftop Unit Optimization. This topic will offer a continuation of some of our earlier discussions regarding RTU’s. For a full course description and background on our presenter, please see the write-up below.

The program will be held at a new venue for us, Dave & Buster’s located in Wauwatosa on Hwy 100, see

4:00 to 5:00 PM – Registration and Networking (Cash Bar)
5:00 PM – Scholarship/Awards Presentation
5:00 to 6:00 PM – Presentation (Appetizers)
6:00 to 8:00 PM – Reception: Buffett Dinner & D&B Fun!



Packaged rooftop units (RTUs) are used to easily and effectively heat and cool more than 50% of all commercial buildings, but are they efficient?  The cooling efficiency improvements in the refrigeration circuits have improved slightly in the past 10 years and the average gas efficiency has improved from 80% to just 82%.  What else can we do to make a simple RTU use significantly less energy to heat and cool our structures?  A recent 2013 Department of Energy study explored this exact question and the solution is summarized by the term Advanced Rooftop Control or ARC.  This seminar will explore that ARC research and several options for existing (or new) RTUs to save 24 to 35% of the fan, cooling, and heating energy.

 Review of What We Already Know… but maybe don’t implement enough

  • Programmable Thermostats: recommended settings, OA interlocks, and Wi-Fi… duh, everything with an App is better
  • Economizers: dry-bulb vs. enthalpy, integrated economizing, and recommended settings… yes you have been too conservative
  • Demand Controlled Ventilation (DCV): basic concept, sensor reliability, recommended settings, and “is that allowed in Wisconsin?”
  • Code requirements, utility rebates, and energy savings calcs for all of the above

What is New?… or at least new again

  • Multi-speed fan control of “Constant Volume” systems
  • Name Game: Staged Air Volume (SAV), Single Zone VAV, Multi-stage Air Volume (MSAV)
  • How is SAV different than VAV?
  • What good is a VFD on a “constant volume” RTU?
  • How is it controlled?
  • Is it required by energy codes or standards?
  • Energy savings and utility rebates

What about ERVs, Variable Capacity Compressors, Dynamic Balancing Systems, and Magic Black Boxes… oh, we love those magic elixirs

  • It is not easy jamming 4 hours of topics into an hour, so we cannot cover everything
  • Never fear, we can direct folks to recorded webinars if they want to learn more about some of these technologies
  • And of course there is always cocktail time… Ryan would be happy to discuss any of these topics with you


Ryan R. Hoger, LEED AP, has been with Temperature Equipment Corp. since 1997. He was the 2007-08 president of the Illinois ASHRAE Chapter and is actively involved with several ASHRAE and gas/electric utility committees. He has extensive experience with RTU controls, building automation systems (BAS), energy recovery ventilators (ERV), variable refrigerant flow (VRF), demand controlled ventilation (DCV), and other energy conserving HVAC systems.  Ryan has written several HVAC articles for various publications and has a Bachelor of Science degree in General Engineering from the University of Illinois. He can be contacted at

Please register in advance.