Principles of Air-Conditioning

What is Air-conditioning?

• removal of heat from a space by removing the humidity to ensure low moisture content in the space to achieve human comfort

• removal of heat from one substance and transferring it to another substance

• removal of heat from a space by controlling the temperature, humidity, air movement and the cleanliness of air by mechanical means to achieve thermal human comfort

• transfer of humidity from outside of the space in order to increase the temperature inside to achieve high moisture content inside

What is Heat?

• The temperature shown on a thermometer

• The transfer of kinetic energy from one medium or object to another, or from one energy source to a medium or object

• The source of water vapour in the air, also known as humidity

• A form of energy measured in both quantity and intensity

Does every object on Earth contain heat?

• Yes

• No

• Maybe

• I don't know

Is there always particle movement within heat energy?

• No

• Yes

• Depending on how high the temperature is

• Allahu a'alam (God knows best)

Heat intensity is measured by its temperature. True or false?

• True

• False

• Neither

• Or

What is the unit of Heat Intensity?

• Degrees Fahrenheit (°F)

• kilograms (kg)

• British Thermal Unit (Btu)

• Degrees Celsius (°C)

Answer explanation

Both Degrees Fahrenheit (°F) and Celsius (°C) are correct.

Only difference is the system of units each of them belong to.

We in Brunei follow the metric system of units, which would be Degrees Celsius (°C)

Temperature is defined as...

• Heat energy

• Measure of the particle vibrations inside an object

• Measure of moisture content inside an object

• Thermal state of matter

Answer explanation

Temperature is defined as

the thermal state of matter, measured in the particle vibrations inside an object

The higher the temperature,

the higher the particle movement inside the object

and vice versa

If all heat were removed from an object, the temperature of the object would decrease to -459.6°F [-273.2°C].

What is this temperature called?

• Freezing point

• Absolute zero

• Minimum heat quantity

• Maximum low temperature

At Absolute Zero temperature, all particle movement stops. Is this true?

• Depends on the object frozen

• Yes

• Depends on the temperature of the environment

• No

What is Heat Quantity?

• the amount of heat energy required to raise the temperature of 1kg of water up by 1°C

• the temperature contained in one molecule of kinetic heat energy

• the amount of heat energy required to raise the temperature of 1lb. of water up by 1°F

• the amount of water required to raise the temperature of 1lb. of heat energy up by 1°F