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Refridgeration Flashcards

1
Q

Explain conduction

A

Heat transfer within the material, solid transfer

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2
Q

Explain heat transfer

A

Heat will always transfer from hot to cold

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3
Q

Explain convention

A

Hotter areas of water circulate into colder areas, until all the water is the same temperature

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4
Q

Explain radiation

A

Heat transfer through the air

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5
Q

Explain sensible heat

A

The temperature increases with no change of state

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6
Q

Explain latent heat

A

The state changes but the temperature remains the same (ice cube melting)

Heat required to change the state of a substance

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7
Q

What is super heating

A

Increasing the temperature above its boiling point

IE steam that is 110’c it is 10’c super heat

A gas with a temperature rise above its boiling point

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8
Q

Explain Sub-cooling

A

A gas changes into a liquid

Cooled below a 100’c to 90’c means 10’c sub cooling

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9
Q

What is the fridge temperature for frozen meat

A

-18’c to -22’c

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10
Q

What are the Fridge temperatures

A

Cold room =-18 to -22
Cold room dairy = +4’c to +6’c
Fruit and veg store = +4’c to +6’c
Galley ready use cupboard = +5’c to +7’c

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11
Q

What does the compressor do in the basic refrigeration system do

A

Pumps the refrigerant around the system

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12
Q

What job does the condenser do in the refrigeration system do

A

Uses sea water to cool the refrigerant to achieve sub-cooling

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13
Q

What does TEV stand for

A

Thermostatic expansion valve

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14
Q

What job does the TEV do

A

Monitors the gas leaving the evaporator and adjusts the flow through the evaporator

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15
Q

What job does the evaporator do

A

To absorb heat energy, to turn refrigerant liquid into gas

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16
Q

What does the hp/lp cut out do

A

Shuts the plant down if the pressure is to high/low

17
Q

What colours are in the moisture sight glass

A

Green indicates dry (good)

Yellow indicates moisture (bad)

18
Q

3 types of defrosting

A

Natural defrost
Hot gas defrosting
Electrical heating coils

19
Q

When do electrical heating coils used

A

1 hour per day

20
Q

When are natural defrost done

A

Every 3- 6 months (normal air temp)

21
Q

When are hot gas defrosting done

A

1 hour per day 4-15 mins slots to prevent the oil cooking off

22
Q

What is used for leak detection

A

Infra red leak detection system (rlds)

Oil slicks

Spectrolyne dye and UV lamp

Snoop

Halogen leak detector

23
Q

What is stated in the Montreal protocol 1987

A

Agreement to phase out the use of harmful CFC gasses and ozone depleting substances

CFC,HCFC and Halon

24
Q

What is stated in the Kyoto Summit 1997

A

Agreement to limit and reduce greenhouse gasses

CO2, HFC’s, PFC’s greenhouse gasses

25
Q

How would oil be added by following methods

A

Sump filler cap
Hand pump
Dosing pot

26
Q

Chilled water plant provide cooling for

A

Weapons systems
Radars
Ships computer systems
Air treatment units (ATU’s)

27
Q

What does ATU stand for

A

Air treatment units

28
Q

Refrigerant hazards

A

Refrigerant gases are heavier than air and will fall to the bottom of the compartment

29
Q

What precautions should be taken when working on refrigerant phosgene gas

A

No smoking,welding, or burning near the refrigerants when refrigerant is burning it produces phosgene gas (mustard gas)

30
Q

What do you do if some one has refrigerant in their eye

A

Bathe eyes in water opening and closing to wash it out

31
Q

Advantages of hydraulics

A 
Reliable 
Simple and easy to understand 
Infinite speed range 
Easily reversible 
No spark
32
Q

Disadvantages of hydraulics

A

Fire risk
Noise
Risk of contamination less efficient

33
Q

PPE when working on fluorocarbon elastomers

A

PVC gauntlets
Rubber boots
PVC coveralls
Full face visor

34
Q

What are O rings made of

A

Fluorocarbon elastomers normally used in keelering couplings

35
Q

What temperature do O ring melt at and what gas is given off

A

300’c and gives off hydrogen fluoride

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