Unit 25 - Chapter 113 Flashcards

0
Q

The function is a condenser is to

A

Change high pressure refrigerant vapour to liquid

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1
Q

In the case of a simple ice box which heat transfer occurs?

A

Air loses sensible heat, ice gains latent heat

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2
Q

Which of the following statements about low side pressure and temperature is false?

A

The evaporation temperature of the refrigerant should be 5 - 10 degrees higher than that of the cooled medium

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3
Q

Which of the following statements about high side pressure and temperature is true?

A

The condensing temperature of the vapour is 15 - 20 degrees higher than the temperature if the medium used in the condenser

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4
Q

The rate at which a system will remove heat from the refrigerated medium is defined as

A

Refrigeration capacity

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5
Q

Refrigerant mediums will evaporate

A

When temperature is increased

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6
Q

One tonne of refrigeration is

A

233 kJ per minute

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7
Q

If a cooled medium had an evaporation of 2 degree, the evaporation temperature of the liquid refrigerant should be

A

-8 to -3 degrees

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8
Q

Which column in the refrigerant the lists the absolute pressure in kPa?

A

Column 2

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9
Q

Heat, whose application causes a rise in temperature, is called

A

Sensible heat

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10
Q

If chilled water at 2’C circulates through an evaporator and then is used in a cooling cool to cool an air duct, the evaporator temperature should be

A

Less than 2’C

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11
Q

What is an example of loss of latent heat?

A

Steam condenses

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12
Q

When a liquid evaporates it

A

Gains latent heat

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13
Q

With regard to the condenser in a refrigeration system, what is true?

A

The condensing temperature of the refrigerant vapour is 15-20’C higher than the temperature of the cooling medium

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14
Q

In a closed vessel, the boiling point can be raised by

A

Raising the pressure in the vessel

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15
Q

The net refrigerating effect of a refrigerant is the amount of heat

A

Absorbed by the refrigerant in the evaporator

16
Q

The saturation temperature of a refrigerant is the same as its

A

Boiling point

17
Q

In a refrigeration system the liquid refrigerant is changed to a gas in the

A

Evaporator