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Ventilation Systems

Ventilation Systems. Improved Ventilation Effectiveness. Effective mixing of ventilation air within space Exhaust from appropriate spaces Provide clean outdoor air, avoid: loading docks exhaust vents plumbing stacks waste collection stagnant water. Air Distribution . Ductwork

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Ventilation Systems

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  1. Ventilation Systems

  2. Improved Ventilation Effectiveness • Effective mixing of ventilation air within space • Exhaust from appropriate spaces • Provide clean outdoor air, avoid: • loading docks • exhaust vents • plumbing stacks • waste collection • stagnant water

  3. Air Distribution • Ductwork • Metal • Flexible • Grilles, Louvers, & Registers • Dampers • Shut off • Fire • Smoke • Sealants • Supports

  4. Air Pressure • Positive/negative air pressures • Scenting • Stairwells • Fire issues

  5. Terminology • ASHRAE • American Society of Heating, Refrigeration, and Air Conditioning Engineers • Ventilation • Provides a controlled amount of air to a room or building • Fresh Air • “Outside air” which may be hot, humid, or cold, lack of moisture, or be polluted. • Ventilation Rates • The movement of a specified amount of air • Generally Covered in Codes

  6. Psychrometrics • Dry bulb temp. • Wet bulb temp. • Humidity • Dew point • Moisture content • Heating • Cooling • Humidify • De-Humidify Psychrometric Chart

  7. Load Calculations • Heating and Cooling • Design conditions • Building shell load • Internal load • Ventilation load • Occupancy schedules

  8. Ventilation Systems • Central • Room • Zone • Kitchen • Ventilation Ducts

  9. Terminology • Dry Filters • Oil-Treated • Electronic • Pollution Control

  10. Additional Equipment • Energy Recovery Units

  11. Mechanical Dehumidification • Return air is mixed with ventilation air • Cold coil condenses moisture • Heat is added back (electric or gas) so that room air is not over cooled- Reheat Filter

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