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EBCx Tips and Tricks; Lessons from a Career in the Field


This workshop will use interactive exercises and 3D SketchUp models to illustrate field techniques that can be used to evaluate existing building systems. The physical principles will be universally applicable across the entire building commissioning spectrum.

The initial focus will be on assessing air side economizers during the design, construction, and ongoing commissioning phases of a building’s life cycle. It will leverage the Functional Testing Guide’s Economizer Evaluation Checklist by having the attendees us it to evaluate an economizer in one of the models. We will discuss results of the assessment and look at what the improvements would look like when implemented, including methods to assess their cost and benefit.

We will then shift to waterside opportunities by exploring a central chilled water plant in a 3D SketchUp model to scope it and identify potential EBCx opportunities.

We will then focus on pump optimization and the associated power and energy savings calculations, starting with a power calculation for a pump that is running more than it needs to. While the power associated with running a given pump will be the same for any location, the energy and dollar savings achieved by eliminating unnecessary run hours can vary significantly with the climate and utility rates. We will illustrate this by exploring the cost/benefit for the improvement if implemented in different locations.

The class will conclude by exploring pump optimization opportunities that exist in the plant, including contrasting an impeller trim with applying a variable speed drive and replacing a pump with a right sized pump. Time permitting, the class will also explore variable speed drive control optimization strategies and methods for assessing the potential savings to be achieved by the various options.


  • David Sellers

    David is a Senior Engineer with Facility Dynamics Engineering. His background includes over 40 years of experience with commissioning, design engineering, facilities engineering, mechanical and control system contracting, and project engineering. He has been able to practice is profession in a wide array of facilities, ranging from hospitals and semiconductor clean rooms to commercial office buildings and has also been able to participate in research and pilot projects in the energy efficiency and sustainability arena.

    David also provides technical training and develops technical guidelines on retro-commissioning and commissioning field techniques and engineering fundamentals in a number of venues. David has BS in aeronautics with a major in Aircraft Maintenance Engineering from Parks College of St. Louis University and is a licensed Professional Engineer in the States of Missouri and Washington. He is also and is a licensed airframe and power plant mechanic.

    David was recently honored as the recipient of the 2017 Benner Award at the National Conference on Building Commissioning. The award is named in memory of Nancy Benner and recognizes outstanding achievement in making building commissioning “business as usual.”"

July 27, 2020
Mon 8:00 AM PDT

Duration 4H 0M

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