wunder beta📘 A refrigerator moves heat instead of making cold
A refrigerator does not manufacture a substance called cold.
4
lessons
~20 min
to learn
Adults
level
What you’ll learn
- The cold boxExplain why a refrigerator moves heat from an insulated compartment into the room.The box limits heat gain while the evaporator removes the remaining thermal energy.
- Pressure changesConnect compression and expansion to refrigerant pressure, temperature, and flow.The compressor creates the pressure difference and the metering device prepares refrigerant for low-temperature boiling.
- Rejecting heatDescribe how the condenser releases the transported heat outside the compartment.The warm-side heat exchanger condenses refrigerant and transfers heat to room air.
- The complete loopTrace evaporation, compression, condensation, and expansion as one repeating cycle.Phase changes and pressure changes let a closed refrigerant loop act as a heat pump for the cold box.
Questions this course answers
Where does the refrigerator take heat from?
The evaporator absorbs heat from the compartment.
What does the expansion device mainly do?
The pressure drop prepares a cold low-pressure mixture for the evaporator.
Why is the condenser warm?
The condenser rejects the heat transported from inside and the energy added by the compressor.
What are the four main stages of the cycle?
The refrigerant evaporates, is compressed, condenses, and expands before repeating the loop.
Grounded in trusted sources
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