ETC Group’s Chris Jackson, PE, LEED-AP, and Bryan Lang, PE, CxT, CEM, EMP, are invited to speak at the 2021 AEE World Energy Conference & Expo. In this presentation, Chris and Bryan will discuss operational strategies for the challenges involving flat plate and chiller transitions, which will be particularly benefitial to facility managers, controls contractors, and mechanical designers.

Association of Energy Engineer (AEE) World Energy Conference & Expo is an annual event for global energy effiiency and sustainability professionals. Their technical sessions cover key energy issues, energy-efficient solutions, new energy initiatives, and developments in clean energy technologies. ETC Group is an active member of AEE.

To register for the event, click here. See below for the short speaker biographies and presentation abstract.



Chris Jackson, PE, LEED-AP, is Vice President of Business Development/Principal Engineer at ETC Group. Chris is the key member in establishing and driving ETC Group’s Arizona branch, which represents nearly 50% of the company’s project work since 2016 and helped one Arizona client cut more than $10 million/year in energy cost.

Chris graduated with B.S. in Chemical Engineering from the University of Utah in 2005 and earned MBA from the University of Utah in 2007. Chris is a licensed Professional Engineer in 4 states and was recently named a 2021 recipient of Consulting-Specifying Engineer’s 40 Under 40 Award.


Bryan Lang, PE, CxT, CEM, EMP, is the Engineering Manager at ETC Group. Bryan has implemented energy efficiency projects across numerous facility types, specializing in large hospitals. Recently, he has led the engineering and delivery of several turnkey energy projects that have exceeded savings targets within schedule and budget constraints.

Bryan holds a Bachelor of Science Degree in Mechanical Engineering from Arizona State University and is a licensed Professional Engineer in 2 states. Additionally, he is a CEM, CxT, EMP, and GBE. Bryan was the recipient of the Association of Energy Engineer’s 2020 International Young Energy Professional of the Year.


Transitions between waterside economizer mode (flat plate heat exchanger) and mechanical cooling mode (chiller) in a chilled water plant are a common challenge facing facility teams, controls contractors, and mechanical designers. Due to these difficulties many economizers are underutilized or abandoned entirely.

In this session, attendees will learn strategies to:

  • reduce chiller surge at low load and low ambient temperature.
  • place demand limits preventing unnecessary stage-up.
  • optimize and maximize waterside economizer operation.
  • ease the transitions between chiller and economizer modes.

We will review operational strategies to reduce the stress and impact of mode transitions and improve winter and shoulder season operation. Our focus is a plant piping configuration with the heat exchanger and chillers sharing a condenser water sump and the heat exchanger is piped in series with the chillers.