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heat pump refrigerators

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Wize University Physics Textbook (Master) > Thermodynamics

Refrigerators and Heat Pumps

3 Activities

A refrigerator has a coefficient of performance of 3.0.
More Refrigerators and Heat Pumps Questions:
Thermodynamics: Refrigerators and Heat Pumps
A refrigerator is operated by a 1000 watt motor. If the “coefficient of performance” of this refrigerator is 5, what is the rate in which heat transfers to the room from the back pf the refrigerator? Imagine you put a plate of food with the total mass of 500g and a temperature of 50 °𝐶 inside the refrigerator. If the effective specific heat of the plate of food is 4000 Jkg⋅K\frac{J}{kg\cdot K}, how long does it take for the refrigerator to cool it down to 5 °𝐶?
Thermodynamics: Refrigerators and Heat Pumps
A heat engine with 55% efficiency is used as a refrigerator. If the reservoirs
remain the same, what is the coefficient of performance for this refrigerator?
If the heat absorbed by the refrigerator is equal to 5kJ, calculate the work
For heat engine cycle is
clockwise
while for heat pump cycle is
counterclockwise
A Carnot air conditioner takes energy from the thermal energy of a room at 70o F and transfers it to the outdoors which is at 96o F. For each joule of electric energy required to operate the air conditioner, how many joules are removed from the room?