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❄️ How Does a Refrigerator Move Heat?

Follow heat through the compressor, condenser, expansion device, and evaporator to see why a refrigerator cools its food while warming the room.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

Heat moves, cold followsUnderstand that a refrigerator transfers heat from its cabinet to the surrounding room rather than creating a substance called cold.A refrigerator uses a sealed refrigerant loop and electrical work to move heat out of the cabinet. The compressor starts the loop by raising the pressure and temperature of the vapor.
The four-part loopFollow the four stages of vapor-compression refrigeration and connect pressure changes to evaporation and condensation.The condenser rejects heat, the metering device drops pressure, and the evaporator absorbs heat as refrigerant boils. Frost and defrosting show how the cold-side heat exchanger affects airflow.
A refrigerator is a controlled heat pumpCompare absorption and compression refrigeration, identify why refrigerant choice matters, and see how controls regulate runtime.Absorption units use heat instead of a motor-driven compressor. Refrigerant safety and a thermostat complete the practical picture of a refrigerator as a controlled heat pump.

Questions this course answers

What does a household refrigerator mainly do?

A refrigerator is a heat pump that removes thermal energy from its insulated cabinet and rejects it outside.

What happens in the condenser?

The condenser is the hot-side heat exchanger where high-pressure refrigerant rejects heat to the room and becomes liquid.

Why does the metering device help create cooling?

The pressure drop lowers the refrigerant's boiling temperature before it enters the evaporator.

Why can the back of a refrigerator feel warm?

The condenser rejects heat removed from the cabinet and the work supplied by the compressor and fans.

What is different about an absorption refrigerator?

An absorption cycle uses heat to circulate working fluids, while a conventional household unit uses mechanical compression.

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