Easing Transitions between Flat Plate and Chiller: Strategies to Reduce Surge and Maintain Building Load Efficiently
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:
1) reduce chiller surge at low load and low ambient temperature.
2) place demand limits preventing unnecessary stage-up.
3) optimize and maximize waterside economizer operation.
4) 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.
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.