Air Conditioning Systems

Question 1

What are the 4 classifications (based on size and applications) of air conditioning systems ?

Answer 1

Domestic
Commercial
Industrial
Transport

Question 2

Fill in the blanks

Answer 2

Question 3

Fill in the blanks

Answer 3

Question 4

What are the 5 main types of air conditioning in Australia ?

Answer 4

Self-contained units (RAC’s)
Split systems
Ducted systems
Package units
Central plant systems

Question 5

What are Self-Contained Units (RACs)

Answer 5

Question 6

What system is this ?

Answer 6

Split system

Question 7

What system is this ?

Answer 7

Ducted system

Question 8

What system is this ?

Answer 8

Package Unit

Question 9

What system is this ?

Answer 9

Central plant systems

Question 10

What are the 4 main steps of risk management process ?

Answer 10

1. Identifying hazards
2. Assessing risks
3. Controlling risks
4. Monitoring and review

Question 11

Fill in the temperature readings.

Answer 11

Question 12

What instrument is this ?

Answer 12

Stem Thermometers

Question 13

What instrument is this ?

Answer 13

Infrared thermometer

Question 14

What instrument is this ?

Answer 14

Dial thermometer

Question 15

What is Relative humidity ?

Answer 15

Relative humidity is a measure of how much water vapour is in the air, expressed as a percentage

100% = completely saturated. (Can’t hold any more water)

Question 16

What instrument is this ?

Answer 16

Wet/Dry Bulb Hygrometer

Question 17

What do these readings indicate ?

Answer 17

Question 18

What instrument is this ?

Answer 18

Sling Psychrometer

Question 19

What instrument is this ?

Answer 19

Digital Hygrometer

Question 20

What is Air Flow Rate ?

Answer 20

The amount of air passing through a particular area (e.g. a duct) each second. (m3/s),

Question 21

What instrument is this ?

Answer 21

Vane Anemometer

Question 22

What instrument is this ?

Answer 22

Hot Wire Anemometer

Used for measuring very low flow rates

Question 23

What instrument is this ?

Answer 23

Hood Anemometer

Question 24

What are the composition of air ?

Answer 24

Question 25

What is dry bulb temperature ? (DBT)

Answer 25

Question 26

What is Dew Point (DP) ?

Answer 26

Question 27

What is Relative Humidity (RH%) ?

Answer 27

Question 28

What is specific Humidity (SH) ?

Answer 28

Question 29

What is Enthalpy (H) ? in relation to air conditioning.

Answer 29

Question 30

What is specific volume (SV) ?

Answer 30

The specific volume is a measure of how dense the air is, measured in cubic metres per kilogram (m3/kg), i.e. how much space is occupied by each kilogram of air (remember that air expands as it heats up).

Question 31

What is specific heat ? (in context of air conditioning)

Answer 31

Question 32

What is latent Heat ? (in context of air conditioning)

Answer 32

Question 33

What is sensible Heat ? (in context of air conditioning)

Answer 33

Question 34

What is Total Heat (Enthalpy) ? (in context of air conditioning)

Answer 34

Question 35

List 4 forms of latent heating/cooling.

Answer 35

· Fusion – changing from a liquid to a solid. · Melting – changing from a solid to a liquid. · Vapourisation (evaporation or boiling) – changing from a liquid to a gas. · Condensation – changing from a gas to a liquid.

Question 36

What is the difference between boiling and evaporation ?

Answer 36

Boiling -- occurs throughout a complete volume of liquid Evaporation -- only occurs at the surface of the liquid.

Question 37

What is Sensible Heat Ratio (SHR) ?

Answer 37

Question 38

What are the air conditioning cycle ?

Answer 38

Question 39

Explain the various points in this chart.

Answer 39

Question 40

List 3 cooling methods of the human body.

Answer 40

Question 41

List the ranges of conditions for human comfort.

Answer 41

Question 42

What are the Noise level requirements when installing air conditioning.

Answer 42

Must not exceed 5 dBA above background levels. Must not be audible within a neighbour’s house at night (e.g. 10 pm – 7 am). Note: manufacturer’s specifications should indicate the sound power level of their units

Question 43

List 4 Factors that affect sizing and selecting air conditioning units.

Answer 43