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Theory 4 > Refrigeration > Flashcards

Refrigeration Flashcards

1
Q

Pressure, Volume, Energy statement for boiling liquids.

A

As Pressure Increases, Volume Decreases and More Energy is required to boil a liquid.
As Pressure Decreases, Volume Increases and Less Energy is required to boil a liquid.

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2
Q

Explain heat transfer and 3 ways heat can be transferred.

A

Heat always travels from a Hot body to a Cold body, Heat can be transferred by Conduction, Convection, Radiation.

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3
Q

Explain Conduction.

A

Heat transfers through a Solid.

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4
Q

Explain Convection.

A

Heat transfers through a Fluid.

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5
Q

Explain Radiation.

A

Heat transfers through a Space.

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6
Q

Explain Sensible Heat.

A

This is the heat required to change temperature, not change the state of the substance.

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7
Q

Explain Latent Heat.

A

This is the Heat required to change the state of a substance without any change in its temperature.

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8
Q

Explain Superheat.

A

When a substance goes above its boiling point.

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9
Q

Explain Sub-cooling.

A

When a substance drops below its boiling point.

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10
Q

4 Components of Basic refrigeration system.

A

Compressor, Condenser, Thermal Expansion Valve (TEV), Evaporator.

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11
Q

What is the function of the Compressor?

A

Pumps refrigerant around the system.

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12
Q

What is the function of the Condenser?

A

Uses sea water to cool the refrigerant changing its state from a Gas into a Liquid.

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13
Q

What is the function of the Thermal Expansion Valve (TEV)?

A

Controls the flowrate of refrigerant through the system. Increasing or decreasing the flow depending on the temperature of the refrigerant leaving the Evaporator.

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14
Q

What is the function of the Evaporator?

A

The refrigerant flowing through the Evaporator removes heat from the refrigerant/cold room. This action changes the state of the refrigerant from a Liquid into a Gas.

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15
Q

Fuction of the LP cut out?

A

Stops the compressor if the pressure drops too low.

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16
Q

Function of the HP cut out?

A

Stops the compressor if the pressure gets too high.

17
Q

Function of the Oil Seperator?

A

Seperates oil from the refrigerant.

18
Q

Function of the Drier?

A

Removes moisture from the refrigerant.

19
Q

Function of the Sight Glass and what does it indicate?

A

Indicates moisture in the refrigerant,
Yellow - there is moisture.
Green - there is no moisture.

20
Q

Name 3 Methods of defrosting.

A

Natural Defrost, Hot Gas Defrost, Electrical Heating Cells.

21
Q

When is Natural Defrost carried out?

A

Every 3 to 6 months.

22
Q

When is Hot Gas Defrosting carried out?

A

Done for a maximum of 1 hour in 24 in 15 minute slots.

23
Q

When is Electrical Heat Cells defrosting carried out?

A

Done for a maximum of 1 hour in 24.

24
Q

Name 5 methods of Leak Detection.

A

Oils Slicks, Infra-red leak detection system (IRDLS), Spectrolyne Dye and UV Lamp, Snoop, Halogen Leak Detector.

25
Q

Name 3 Compressor lubricating oils.

A

OM70, SW68, Sysco3GS

26
Q

What does Hygroscopic mean?

A

Absorbs moisture from the atmosphere.

27
Q

Name the methods that oil is added to the compressor.

A
  1. Via a Sump Filler Plug.
  2. By a Hand pump.
  3. Through the use of a Dosing Plant.
28
Q

Montreal Protocol.

A

Agreement to phase out refrigerants

29
Q

Kyoto Summit.

A

Agreement to reduce all Greenhouse gases.

30
Q

Name 3 harmful refrigerants.

A
  1. CFCs
  2. HCFC
  3. HALONS
31
Q

Name 3 Greenhouse gases.

A
  1. CO2
  2. HCF
  3. PFC
32
Q

Name 4 refrigerant hazards.

A
  1. Will displace Oxygen.
  2. Can produce Phosgene Gas if exposed to high temperatures.
  3. Can produce Cold Burns on skin.
  4. Decomposing fruit and veg can produce CO2.
33
Q

What must you do if refrigerant gets into eyes.

A

Flush eyes with running water and go to sick bay.

34
Q

Name 3 Procedures for entering Refrigerant Compartment.

A
  1. Rating in charge of watch must be informed of personnel entering and leaving compartment.
  2. The high and low exhaust fans are running.
  3. Infra-Red Leak Detection System (IRLDS) is working correctly.
35
Q

Name 4 things the Chilled Water Plant provides cooling to.

A
  1. Weapons Systems.
  2. Radars.
  3. Ships Computer Systems.
  4. Air Treatment Units (ATUs)
36
Q

What is the difference between a Refrigerant plant and a Chilled Water Plant?

A

The Chilled Water Plant has a Chiller instead of an Evaporator.

37
Q

What cools the Condenser and Motor?

A

Sea Water.

Theory 4 (2 decks)

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