Refrigeration Flashcards
three methods of heat transfer
Convection
Conduction
Radiation
compressor ?
Pressurises the gas
Moves around the system
Condenser ?
Cools refrigerant with sw
Changing gas into liquid
Thermal expansion valve
Controls flow of refrigerant
reducing temp to very cold
Evaporator
Removes heat from the space
converting refridge liquid into gas
Whats the pressure/vol relationship
pressure increases
Volume decreases
What are the three special lubricants is used in the compressor
OM70
SW69
Suniso3GS
Refrigerant hazards
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
What are some common filters
Panel filter Supply filters Grease filters Lint filters Dust filters Flameproof gauzes
Where are Fan Supply and Fan Exhausts fitted
Machinery spaces Galley Laundries WCs Bathrooms
Where are fan supply and natural exhausts fitted
Store rooms
workshops
Where are natural supply and fan exhaust fitted
Paint stores
spirit rooms
inflame stores
