Enabled Energy’s (EE) engineers were engaged in order to determine the cause of cascading chiller shutdowns and high head pressure that occurred during hot summer days at a facility located in Sunnyvale, CA. In addition, the team was asked to provide a cost-effective and timely solution.
Enabled Energy’s Solution
Enabled Energy’s technical team visited the site and determined the cause of the shutdowns was a combination of condenser coil airflow starvation, recirculation, and degraded condenser coils. The long-term recommended solution presented to the client was to ultimately replace the chillers. However, to temporarily stop the shutdowns, the team of engineers recommended removing the top four feet of plastic sheeting interwoven into the fence surrounding the chiller yard to provide greater airflow. In addition, they suggested adjusting the sequencing of the existing units to avoid simultaneous operation of adjacent units.
Based on the recommended solutions, the client immediately removed the plastic sheeting in the fence around the chillers. In addition, under the guidance of EE, they altered the sequencing of the chillers to ensure that the units next to each other would not be running simultaneously. There was an immediate increase in airflow around all the units which prevented the units from shutting down as before. The client continues to evaluate the need for a future chiller replacement.
Enabled Energy, Inc. completed the site visit and report in June 2021. EE Fellow and industry expert, Paul Svenkeson, provided expert consultation.