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Fans Filters and Airflow : Applications and Issues

Fans Filters and Airflow : Applications and Issues. Arthur Miller, CMS, RCT. www.kam-associates.com info@kam-associates.com. HVACR Training Consultant. OUTLINE. Air Flow Terminology Classification of Duct Systems Duct Design Methods Fans Ducts Air Flow & Issues with Design of Ducts

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Fans Filters and Airflow : Applications and Issues

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  1. Fans Filters and Airflow: Applications and Issues

  2. Arthur Miller, CMS, RCT www.kam-associates.com info@kam-associates.com HVACR Training Consultant

  3. OUTLINE Air Flow Terminology Classification of Duct Systems Duct Design Methods Fans Ducts Air Flow & Issues with Design of Ducts Filters Conclusion(s) & Solution(s)

  4. A’PRACTICALAPPROACH’ALONG WITH SOME THEORY

  5. 3 ¼ x 12 wall stack

  6. Who is Liable? • The contractor – from design to installation to service • The filter manufacturer • The building owner • Nobody

  7. AIR FLOWTERMINOLOGY

  8. CFM • Volume or Quantity of air • measured in Ft3/min

  9. FPM • Velocity of the air • measured in Ft/min

  10. STATIC • Resistance to the air flow • measured in inches of water column (“w.c.)

  11. Classification of Duct Systems • Low Pressure System - up to 2” w.c. • Medium Pressure System - up to 6” w.c. • High Pressure System - up to 10” w.c.

  12. Duct Design Methods • Velocity Method • Static Regain Method • Equal Friction Method

  13. Velocity Method • Select velocity for main and branch ducts. • Determine duct sizes. • Determine frictional pressure drops. • Select a fan.

  14. Static Regain Method • Select velocity for main ducts. • Velocities are selected so the static pressure at each take-off offsets the pressure loss of the preceding section of ductwork. • Select a fan.

  15. Equal Friction Method • Selection of friction loss. • Volume of air is known. • Duct is sized based on 1 and 2 above. • Select a fan or fan is selected.

  16. FANS The ‘HEART’ of the air delivery system

  17. Relationship betweenSTATIC andCFMin respect to aFAN

  18. Are they A. a direct relationship B. an indirect relationship C. neither

  19. CFM STATIC

  20. STATIC CFM

  21. two configurationsof fans

  22. 1. AXIAL 2. CENTRIFUGAL

  23. First, theAxial Fans

  24. What makes an axial fan an axial fan? Definition?

  25. ANSWER Discharge Air Flow PARALLEL to shaft of motor/fan (NO change in direction)

  26. TYPES 1. tubeaxial 2. vaneaxial 3. propeller

  27. TUBEAXIAL 1. operates at pressures up to 16” wc 2. wheel turns faster than propeller fan 3. efficiency up to 65%

  28. VANEAXIAL 1. operates at pressures up to 20” wc 2. uses guide vanes to improve efficiency and pressure 3. most energy efficient fan

  29. PROPELLER 1. operates at low speeds 2. handles large volumes of air at low pressure and at free delivery 3. efficiency is usually less than 50%

  30. Performanceof PROPELLORFans

  31. PROPELLOR FAN What is the LOADING componenton aPROPELLORfan? • CFM • FPM • STATIC

  32. STATIC

  33. This ‘LOAD’ is then imposed on the motor. How will the motor respond?

  34. STATIC AMPS

  35. STATIC AMPS

  36. APPLICATION(S)

  37. (1) The condenser on an air conditioner is very dirty. What will happen to the: fan delivery in cfm? fan motor amp. draw?

  38. Fan delivery in cfm Increases Decreases Remains the same

  39. Fan delivery in cfm Increases Decreases Remains the same

  40. Fan motor amp. draw Increases Decreases Remains the same

  41. Fan motor amp. draw Increases Decreases Remains the same

  42. (2) What about a filter on an ice machine condenser? What will happen to the: fan delivery in cfm? fan motor amp. draw?

  43. Fan delivery in cfm Increases Decreases Remains the same

  44. Fan delivery in cfm Increases Decreases Remains the same

  45. Fan motor amp. draw Increases Decreases Remains the same

  46. Fan motor amp. draw Increases Decreases Remains the same

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