Four live demos for a one-hour session. One fan runs through all of them: a backward-inclined centrifugal, rated 1,750 RPM, designed for 10,000 CFM at 3.5 in. w.g. on a 10 hp motor. Every number on every page comes from the same model and the same three fan laws.
| Time | Section | What happens |
|---|---|---|
| 0:00–0:05 | Hook & agenda | Why fans: airside fans are typically the largest single electrical end-use we design. One question frames the hour: “who decides the CFM?” |
| 0:05–0:14 | 1 · Moving air | Animated fan + duct. Spin it, throttle it — a fan is a pressure machine, and airflow is a negotiation with the system. Ends with the reveal: sweeping the damper traces a line, and that line is the fan curve (it’s also the AMCA 210 lab test). |
| 0:14–0:36 | 2 · The fan curve | The centerpiece. Build the chart layer by layer: fan curve, system curve, operating point, speed family, surge zone, efficiency rails, and the BHP curve on its right-hand axis — the way every manufacturer prints it. Run the scenarios (dirty filter, VFD hold, VFD turndown) and do live fan selections from the schedule. |
| 0:36–0:45 | 3 · The fan laws | Why the picture works: Q ∝ N, P ∝ N², W ∝ N³ — with the intuition for each exponent, and the proof that the laws generate the entire curve family from one test. |
| 0:45–0:55 | 4 · The payoff | Part-load power four ways: dampers vs. VFD vs. VFD + static reset vs. the ideal cube. Annual dollars from a real load profile, the 90.1 hooks, and the 60-second pump translation. |
| 0:55–1:00 | Recap & questions | Three sentences: the fan offers a curve, the system picks the point, speed is how you move it cheaply. Then Q&A. |