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Theory 4 > Refrigeration > Flashcards

Refrigeration Flashcards

1
Q

As pressure increases

A

Volume decreases and more energy is required to boil a liquid.

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2
Q

As pressure decreases

A

Volume increases and less energy is required to boil a liquid.

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3
Q

3 types of Heat transfer?

A

Conduction
Convection
Radiation

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4
Q

Describe Conduction?

A

Heat transfer through a solid

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5
Q

Describe convection?

A

Heat transfer through a fluid.

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6
Q

Describe Radiation?

A

Heat transfer through a space.

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7
Q

Describe sensible heat?

A

Heat required to change temp not change state of substance.

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8
Q

Describe latent heat?

A

Heat required to change state of substance not the temp.

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9
Q

Describe superheat?

A

Substance goes above boiling point it is superheated. Every degree in heat gains 1 point degree of superheat.

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10
Q

Describe sub-cooling?

A

Substance cools and condenses into liquid then drops below its boiling point.

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11
Q

4part refrigeration components?

A

Compressor
Condenser
Thermal expansion valve (TEV)
Evaporator

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12
Q

Function of compressor?

A

Pumps refrigerant around the system.

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13
Q

Function of condenser?

A

Used sea water too cool the refrigerant changing its state from a gas into a liquid.

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14
Q

Function of a (TEV)?

A

Controls flow rate of refrigerant through a system increase and decrease flow depending on temp of refrigerant leaving evaporator.

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15
Q

Function of evaporator?

A

Refrigerant flowing through evaporator removes heat from refrigerator changes state from liquid to gas.

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16
Q

LP cut out?

A

Stops compressor if pressure drops.

17
Q

HP cut out?

A

Stops compressor if pressure gets too high.

18
Q

Oil separator?

A

Separates oil from the refrigerant.

19
Q

Liquid receiver?

A

Stores refrigerant during maintenance.

20
Q

Function of Drier?

A

Removes moisture from refrigerant.

21
Q

Sight glass?

A

Indicates moisture in the refrigerant
Yellow - there is moisture
Green - there isn’t moisture

22
Q

Methods of defrosting?

A

Natural defrost- every 3 to 6 months
Hot gas defrost- maximum of 1 hour in 15 minute slots.
Electric heating coils- same as hot gas.

23
Q

Methods of leak detection?

A 
Oil slicks 
Infra-red leak detection system
Spectrolyne dye and UV lamp
Snoop
Halogen leak detector
24
Q

3 lubricants?

A

OM70
SW68
Suniso 3GS

25
Q

Ways oil is added to the compressor?

A

Via sump filler plug
By a hand pump
Through the use of a dosing pot

26
Q

Montreal protocol?

A

CFC
HCFC
HALONS

27
Q

Kyoto summit - reduce greenhouse gasses.

Greenhouse gasses?

A

CO2
HFC
PFC

28
Q

What is chilled water used for?

A

Weapon systems
Radars
Ships computer systems
Air treatment units (ATU)

Theory 4 (4 decks)

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