Unit 25 - Chapter 113 Flashcards
The function is a condenser is to
Change high pressure refrigerant vapour to liquid
In the case of a simple ice box which heat transfer occurs?
Air loses sensible heat, ice gains latent heat
Which of the following statements about low side pressure and temperature is false?
The evaporation temperature of the refrigerant should be 5 - 10 degrees higher than that of the cooled medium
Which of the following statements about high side pressure and temperature is true?
The condensing temperature of the vapour is 15 - 20 degrees higher than the temperature if the medium used in the condenser
The rate at which a system will remove heat from the refrigerated medium is defined as
Refrigeration capacity
Refrigerant mediums will evaporate
When temperature is increased
One tonne of refrigeration is
233 kJ per minute
If a cooled medium had an evaporation of 2 degree, the evaporation temperature of the liquid refrigerant should be
-8 to -3 degrees
Which column in the refrigerant the lists the absolute pressure in kPa?
Column 2
Heat, whose application causes a rise in temperature, is called
Sensible heat
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
Less than 2’C
What is an example of loss of latent heat?
Steam condenses
When a liquid evaporates it
Gains latent heat
With regard to the condenser in a refrigeration system, what is true?
The condensing temperature of the refrigerant vapour is 15-20’C higher than the temperature of the cooling medium
In a closed vessel, the boiling point can be raised by
Raising the pressure in the vessel
