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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