ETC Group’s energy efficiency engineers, Jim Crockett, PE, and Greg Jimmie will speak at the 2021 AEE World Energy Conference & Expo. Their presentation, “Steps for Improving Air-Cooled and Water-Cooled Chiller Performance and Energy Efficiency,” will take place on October 22, 10:30-11:00am as a part of Session 3, Track C: Infrastructure Renewal – A Phenomenological Way to Save Energy. This presentation is for anyone involved in the building ownership, facility management, design, installation, operation, energy analysis, project management, commissioning, test and balance, maintenance, or service work of air- and water- cooled chillers.

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.



Jim Crockett, PE, joined ETC Group in 2018 with 25 years of experience in the HVAC industry in general, and 15 years specializing in energy efficiency. At ETC Group, he has been the lead engineer on HVAC Energy Efficiency projects around the world and has provided technical guidance in support of ETC Group’s engineering staff and Monitoring-Based Commissioning program.

Jim holds a B.S. in Mechanical Engineering from the Brigham Young University and an MBA with Finance Concentration from Southern Methodist University. He is a registered Professional Engineer in AZ, CA, FL, ID, KS, MT, NM, TX, UT, and WA. Jim is the recipient of the 2021 AEE Region V Engineer of the Year Award.


Greg Jimmie is an Energy Engineer/Analyst at ETC Group. His main roles at ETC Group are the analysis and identification of energy efficiency opportunities. Greg works on a wide range of energy systems, which include campus-wide, whole building, and small sub-systems. He is an expert in chiller plant sequencing and optimization, and works with engineers to troubleshoot and maximize plant performance. Greg also focuses on the building load side to enhance building performance.

Greg earned B.S. in Mechanical Engineering from the University of California, San Diego and completed ClimaCheck expert training in Europe. Greg is an active member of AEE and was recognized as 2020 AEE Region V Young Energy Professional of the Year.


Presenters will discuss strategies to maximize air and water-cooled chiller performance, for example, using reset strategies to respond dynamically to cooling demand. A chiller’s efficiency is most important at non-peak conditions, where it usually runs. System pressure can be optimized by resetting pumps in response to AHU valve positions; chilled water temperature can be reset on the AHU’s collective ability to maintain setpoints. Condenser water should be as cold as weather conditions permit, with a low limit dictated by the chiller manufacturer.

Air-cooled chillers are ‘packaged’ items so engineers rarely seek optimization opportunities. An understanding of their components and the refrigeration cycle might lead to efficiency improvements to beyond factory-rated performance. Compressor efficiency can be improved by maximizing the condenser surface used for condensing refrigerant. Presenters will showcase hardware and control modifications that maximize the condensing area, utilize de-superheating, or use pumps to maintain pressure through expansion devices.