Refrigeration Flashcards
Complete the sentence. As pressure increases…
As pressure increases, volume decreases and more energy is required to boil a liquid.
Complete the sentence. As pressure decreases…
As pressure decreases volume increases and less energy is required to boil a liquid.
Complete the sentence. Heat always travels…
Heat always travels hot to cold.
Describe heat transfer via conduction.
Conduction is heat transfer through a solid.
Describe heat transfer via convection.
Convection is heat transfer through a fluid.
Describe heat transfer via radiation.
Radiation is heat transfer through a space. (Air)
Describe sensible heat.
This is the heat required to change temperature, but not the state of substance.
Describe latent heat.
This is the heat required to change the state of substance without any change in its temperature.
Describe superheat.
When a substance goes over its boiling point.
Describe Subcooling.
When a substance cools and condenses into liquid and then drops below its boiling point.
Describe the function of the compressor. ( What it does )
Pumps the refrigerant around the system.
Describe the function of the condenser. ( What it does )
Uses sea water to cool the refrigerant changing its state from a gas into a liquid. (Subcooling)
Describe the function of the thermal expansion valve. ( What it does )
Controls the flow rate of refrigerant through the system. Increasing or decreasing the flow depending on the temperature of the refrigerant leaving the evaporator.
Describe the function of the evaporator. ( What it does )
The refrigerant flowing through the evaporator removes heat from the refrigerator/cold room. This action changes the state of the refrigerant from a liquid into a gas. (superheating)
Describe the condition of the refrigerant as it flows from the compressor to condenser.
Hot, high pressure gas.
