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32 Cards in this Set
- Front
- Back
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(HVAC) |
Heating Ventilation and Air Conditioning |
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Purpose of an air handling system |
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Components |
● Weather louvre ● Silencer ● Flow rate controller ● Control damper |
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To prevent insects, leaves, dirt and rain from entering |
Weather louvre |
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To reduce noise caused by air circulation |
Silencer |
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Automated adjustment of volume of air (night and day, pressure control) |
Flow rate controller |
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Fixed adjustment of volume of air |
Control damper |
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Components |
● Heating unit ● Cooling unit /dehumidifier ● Humidifier ● Filters ● Ducts |
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To heat the air to the proper temperature |
Heating unit |
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To cool the air to the required temperature or to remove moisture from the air |
Cooling unit /dehumidifier |
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To bring the air to the proper humidity, if too low |
Humidifier |
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To eliminate particles of pre-determined dimensions and/or micro-organisms |
Filters |
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To transport the air |
Ducts |
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Problems with components |
● Flow rate ● Control damper ● Humidifier • Cooling battery ● Filters • Ducts |
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Blocked |
Flow rate controller |
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Poorly adjusted, bad pressure differential system |
Control damper |
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Bad water/steam quality/poor drainage |
Humidifier |
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No elimination of condensed water/poor drainage |
Cooling battery |
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Incorrect retention rate/damaged/badly installed |
Filters |
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Inappropriate material/internal insulator leaking |
Ducts |
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Filter classes |
Dust filters |
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Dust filters |
Standard Aerosol |
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Standard |
Coarse Fine |
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Aerosol |
HEPA ULPA |
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Air Handling Systems |
Primary Secondary Tertiary filters |
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Air Handling Systems samples |
Humidifier Silencer Heating and cooling units |
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1 Filter 2 Tightening frame 3 Register outlet 4 Screw fixation for register |
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Normal office type diffuser with coanda effect |
High induction office type diffusor (avoid) |
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Swirl diffuser |
Low induction swirl diffusor (preferred) |
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pressure differentials concept |
Regulation of room pressure |
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Many air-conditioning applications require the mixing of |
Airstreams |
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The heat transfer with the surroundings is usually small, and thus the mixing processes can be assumed to be |
Adiabatic |
