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Home Economics: 14.1 - Household Technology And Appliances > Refrigerator - Working Principle > Flashcards

Refrigerator - Working Principle Flashcards

1
Q

The working principle of the refrigerator is described under five different headings, name these headings

A

Refrigeration is a cooling process

Compressor

Condenser

Evaporator

Thermostat

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2
Q

Describe the general working principle of refrigeration.

A

When the temperature of the fridge rises above the pre-set temperature which is approximately 4 degrees Celsius the motor activates the compressor to come on

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3
Q

What happens when the temperature of the refrigerator rises above four degrees.

A

The motor activates the compressor to come on

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4
Q

Describe the working principle of the compressor

3

A

The compressor is found at the base of the refrigerator

It contains the gas refrigerant isobutene

A motor or pump connected to the compressor forces the gas refrigerant into the condenser above

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5
Q

Where is the compressor found?

A

At the base of the refrigerator

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6
Q

What does the compressor contain?

A

The gas refrigerant isobutene

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7
Q

What is connected to the compressor?

A

A motor or pump is connected to the compressor

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8
Q

What does the motor or pump connected to the compressor do?

A

It forces the gas refrigerant into the condenser above

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9
Q

Where is the gas refrigerant forces into by the motor or pump connected to the compressor?

A

It is forced into the condenser above

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10
Q

Describe the working principle of the condenser.

3

A

The condenser cools the gas refrigerant and condenses it into a liquid

It is then sent to the evaporator above

The cooling fins at the back of the refrigerator radiate or release heat generated during the process, keeping the condenser cool

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11
Q

What cools the gas refrigerant and condenses it into a liquid?

A

The condenser

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12
Q

What does the condenser do to the gas refrigerant?

A

It condenses it into a liquid

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13
Q

What is condensed into a liquid in the condenser?

A

The gas refrigerant

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14
Q

What happens to the liquid refrigerant?

A

It is sent to the evaporator above the condenser

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15
Q

What do the cooling fins at the back of the refrigerator do?

A

They radiate or release heat generated during the process (condensing process), keeping the condenser cool

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16
Q

What radiate or release heat generated during the process (condensing process), keeping the condenser cool?

A

The cooling fins at the back of the refrigerator

17
Q

Describe the working principle of the evaporator.

3

A

The evaporator, found at the top of the refrigerator, rapidly evaporates the liquid refrigerant into a gas by drawing heat from the fridge cabinet

This cools the internal temperature of the refrigerator cabinet to 3-4 degrees Celsius

The gas refrigerant then returns to the compressor and the cycle begins again

18
Q

Where is the evaporator found?

A

At the top of the refrigerator

19
Q

What does the evaporator do?

A

It rapidly evaporates the liquid refrigerant into a gas by drawing heat from the fridge cabinet

20
Q

How does the evaporator turn the liquid refrigerant into a gas?

A

It rapidly evaporates it by drawing heat from the fridge cabinet

21
Q

What is the effect of evaporating the liquid refrigerant into a gas by drawing heat from the fridge cabinet?

A

This cools the internal temperature of the refrigerator cabinet to 3-4 degrees Celsius

22
Q

What happens to the gas refrigerant that results from the evaporating of the liquid refrigerant?

A

It returns to the compressor and the cycle begins again

23
Q

Describe the working principle of the thermostat.

A

The thermostat is connected to the compressor and maintains the constant internal temperature of 3-4 degrees Celsius within the refrigerator cabinet by turning on and off the motor when needed, e.g. if the door is left open

24
Q

What is the thermostat connected to?

A

The compressor

25
Q

What does the thermostat do?

A

It maintains the constant internal temperature of 3-4 degrees Celsius within the refrigerator cabinet

26
Q

How does the thermostat maintain the internal temperature of 3-4 degrees Celsius?

A

By turning on and off the motor when needed e.g. if the door is left open

Home Economics: 14.1 - Household Technology And Appliances (26 decks)

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