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Questions and Answers
What is the main function of air-conditioning?
What is the main function of air-conditioning?
- Cooling and de-humidifying of air (correct)
- Circulation of air
- Cleaning and filtration of air
- Heating and humidifying of air
Which refrigerant is commonly used for cooling in mechanical refrigeration?
Which refrigerant is commonly used for cooling in mechanical refrigeration?
- Freon 22 (Chlorodifluoromethane)
- Freon 502 (Tetrafluoroethane)
- Freon 12 (Dichlorodifluoromethane) (correct)
- Freon 134a (1,1,1,2-Tetrafluoroethane)
What are the properties of Freon?
What are the properties of Freon?
- High heat of vaporization, non-toxic, non-corrosive (correct)
- Low heat of vaporization, non-toxic, non-explosive
- Low heat of vaporization, non-toxic, non-corrosive
- High heat of vaporization, toxic, explosive
What are the recommended average temperatures for summer cooling and winter cooling?
What are the recommended average temperatures for summer cooling and winter cooling?
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What is the recommended average air velocity for air motion in a confined space?
What is the recommended average air velocity for air motion in a confined space?
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Study Notes
Air-Conditioning Fundamentals
- The main function of air-conditioning is to control the temperature, humidity, and air quality in a confined space.
Refrigerants
- R-22, also known as Freon, is a commonly used refrigerant for cooling in mechanical refrigeration.
Properties of Freon (R-22)
- Freon is a colorless, odorless, and non-toxic gas.
- It has a boiling point of -40.8°C and a freezing point of -157.4°C.
- Freon is non-corrosive and non-flammable.
Temperature and Air Velocity Recommendations
- The recommended average temperature for summer cooling is around 22-25°C (72-77°F).
- The recommended average temperature for winter cooling is around 18-20°C (64-68°F).
- The recommended average air velocity for air motion in a confined space is around 0.075-0.15 meters per second (0.25-0.5 feet per second).
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