Class 11 Physics simulations · Thermodynamics

Refrigerator and heat pump

Pump heat from a cold box to a warm room. The ideal coefficient of performance depends only on the temperatures.

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What to notice

The closer the two temperatures, the less work is needed to move each joule of heat.

Key relation

COP = Q_c / W = T_c / (T_h − T_c)

Try this

Set the freezer colder. How does the required power change?

What you can change

• Inside temperature: -30 to 15 °C
• Room temperature: 15 to 50 °C
• Heat removed per second: 50 to 500 W

More in Thermodynamics

• Adiabatic compression and expansion
• Carnot heat engine
• First law of thermodynamics
• Heating gas at constant pressure
• Entropy in isothermal expansion
• Petrol engine (Otto cycle)
• Work from a rectangular P–V cycle
• Gas under a piston

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