Refrigeration

Question 1

three methods of heat transfer

Answer 1

Convection
Conduction
Radiation

Question 2

compressor ?

Answer 2

Pressurises the gas

Moves around the system

Question 3

Condenser ?

Answer 3

Cools refrigerant with sw

Changing gas into liquid

Question 4

Thermal expansion valve

Answer 4

Controls flow of refrigerant

reducing temp to very cold

Question 5

Evaporator

Answer 5

Removes heat from the space

converting refridge liquid into gas

Question 6

Whats the pressure/vol relationship

Answer 6

pressure increases

Volume decreases

Question 7

What are the three special lubricants is used in the compressor

Answer 7

OM70
SW69
Suniso3GS

Question 8

Refrigerant hazards

Answer 8

They are heavier than air and will displace O2
PHOSGENE GAS
Can produce cold burns on exposed skin
Decomposing fruit and veg can be produced CO2

Question 9

What are some common filters

Answer 9

Panel filter 
Supply filters 
Grease filters 
Lint filters 
Dust filters 
Flameproof gauzes

Question 10

Where are Fan Supply and Fan Exhausts fitted

Answer 10

Machinery spaces 
Galley 
Laundries 
WCs 
Bathrooms

Question 11

Where are fan supply and natural exhausts fitted

Answer 11

Store rooms

workshops

Question 12

Where are natural supply and fan exhaust fitted

Answer 12

Paint stores
spirit rooms
inflame stores