Videos

This page serves as the gateway to the videos we have on the site.

Ripple Effects

These video clips look at how a disturbance in one system can ripple out and cause problems in other interconnected systems.

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Tower Flow Variation

Uniform flow distribution over the fill of a cooling tower is crucial to its performance, but may not always be there.

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Induction Motors

In these videos, I demonstrate the basic principles of induction, which are behind how the induction motors we typically use in our building systems work.   
If you want to know more about ​induction motor theory, you will find a set of training videos on the topic located on the On Demand Training section of the web site.

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Pump Test

This video walks through the steps in a pump test including demonstrating that as the load on the pump motor decreases, the speed of the motor shifts up from the nameplate rating, which is associated with full speed, towards synchronous speed.  In other words, it illustrates how slip for a three phase induction motor will vary with the load on the motor.

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Stratification

This video shows how stratification can vary in a mixed air plenum as a system goes through its operating cycle over the course of a day.  The pave also includes some other information and images related to stratification in mixed air plenums.

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Logic Answers

This string of videos walks you through the answers to the Bureaucratic Affairs Building HHW System Logic Exercise.

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Monitoring Plans

Monitoring plans are tools we use to organize our data collection efforts for existing building commissioning projects.  This video provides an overview of what a monitoring plan is and what you should be thinking about as you develop one.   You will find some related resources on the Monitoring Plan Spreadsheet page of the website

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Variable Flow Systems

This play list includes a video that discusses the various common types of pumping systems that are found in buildings, including constant flow, variable flow, variable flow primary/secondary and variable flow primary only system.  The second video takes a closer look at how a variable flow primary-secondary heating hot water system works.

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Functional Testing

This play list explores the role of functional testing in existing building and new construction commissioning processes.  A case study is included that illustrates how a simple test was devised to "ask the building a question" about an operating problem and how the test results were used to inform a relatively simple modification to the control logic to solve the problem.  

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