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Short note: Air conditioning

Short answer

Air conditioning controls temperature, humidity, cleanliness and distribution of air. Main parts are compressor, condenser, expansion valve, evaporator, air handling unit, ducts and controls. Types include comfort and industrial, and window, split, packaged or central systems; it gives comfort but has high cost and needs sealed, insulated, maintained buildings.

Write a short note on air conditioning.

Air conditioning is the process of treating air to control its temperature, humidity, cleanliness and distribution together, to meet the needs of the occupants or of a process.

Four functions

  1. Temperature control (heating or cooling).
  2. Humidity control (humidifying or dehumidifying).
  3. Air cleaning (filtering dust, pollen, bacteria).
  4. Air distribution and circulation through ducts.

Main parts

  • Compressor, condenser, expansion valve, evaporator (refrigeration cycle) for cooling.
  • Air handling unit with blower, filter and coils.
  • Ducts, diffusers and grilles.
  • Thermostat and controls.
 Room air --> Filter --> Cooling coil --> Fan --> Duct --> Room
                          ^ refrigerant from outdoor unit

Types

  • Comfort air conditioning: offices, homes, hospitals, cinemas.
  • Industrial air conditioning: textile mills, laboratories, computer rooms.
  • By system: window unit, split unit, packaged, central plant (chilled water).

Advantages and limits

Gives comfort in all seasons and a clean room. But the initial and running costs are high, it needs a sealed building with good insulation, and it needs regular maintenance. In Nepal, it is mainly used in hotels, hospitals, offices and malls.

✓ Answer checked by Claude Opus 5.5 (high effort)

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