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HW4

HW4. Problem 18.13 (Use TITUS Square Ceiling MCD diffuser https://www.titus-hvac.com/Products/Diffusers ) Problem 18.16 (The building size is 100 ft x 60 ft; use proportion to determine room sizes) Problem 18.19 Problem 18.20 Problem 18.27 (design problem) . Objectives.

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HW4

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  1. HW4 • Problem 18.13 • (Use TITUS Square Ceiling MCD diffuser • https://www.titus-hvac.com/Products/Diffusers) • Problem 18.16 • (The building size is 100 ft x 60 ft; use proportion to determine room sizes) • Problem 18.19 • Problem 18.20 • Problem 18.27 (design problem)

  2. Objectives • Finish with Duct Design • Learn about Fans

  3. Example Size the ducts and calculate pressure drop from - A to C - B to C A a c C b B Tabulated calculation: ……..

  4. Local Dynamic losses • Losses associated with • Changes in velocity • Obstructions • Bends • Fittings and transitions • Two methods • Equivalent length and loss coefficients

  5. Conversion Between Methods

  6. Duct design concepts • Equal friction method • Static pressure regain method

  7. Equal friction method(the example)

  8. Static pressure regain method

  9. Fans • Driving force to move air in buildings • Raise pressure and produce flow • Two main types: • Centrifugal • Axial

  10. Relevant Fan Parameters • Total pressure rise • Static pressure rise • Power requirement • Efficiency • Note ηtot does not account for motor efficiency

  11. Balance Point

  12. Fan Performance

  13. Centrifugal fans

  14. Axial Fans

  15. Fan Laws • “Approximate relationships” • Given two aerodynamically similar fans, can extrapolate performance data • Be very careful

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