Refrigeration Cycle Steps
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Questions and Answers

Where is heat rejected by the refrigerant in a refrigeration cycle?

  • Cold chamber
  • Condenser (correct)
  • Hot chamber
  • Evaporator
  • What happens to the refrigerant as it passes through the nozzle in a refrigeration cycle?

  • It remains a liquid state but at a lower pressure.
  • It remains as a liquid but with an increased pressure.
  • It solidifies due to the decrease in temperature.
  • It expands into a low-pressure area, reducing in pressure and temperature, turning into a gas. (correct)
  • What does the second law of thermodynamics deal with?

  • Heat (correct)
  • Momentum
  • Energy
  • Work done
  • What percentage of the energy is extracted from the cold reservoir if the coefficient of performance (COP) of a refrigerator is 5?

    <p>25%</p> Signup and view all the answers

    If a working substance in a heat engine absorbs 3000 J from the hot reservoir and 2250 J are wasted per cycle, what is the efficiency of the engine?

    <p>75%</p> Signup and view all the answers

    Where does the refrigerant absorb heat at constant pressure in a refrigerator cycle?

    <p>Inner compartment of the fridge</p> Signup and view all the answers

    What happens to a diamagnetic material when placed in a uniform magnetic field?

    <p>It acquires a net induced magnetic moment opposite to the field</p> Signup and view all the answers

    Which property is conserved according to the first law of thermodynamics?

    <p>Energy</p> Signup and view all the answers

    What type of material is diamagnetic?

    <p>Weakly repelled by magnets</p> Signup and view all the answers

    How does a refrigerator release heat to the air outside in a refrigeration cycle?

    <p>Through an isobaric compression process</p> Signup and view all the answers

    In a given thermodynamic process on an ideal gas where dW  0 and dQ  0, what happens?

    <p>The pressure remains constant</p> Signup and view all the answers

    What does the coefficient of performance of a refrigerator measure?

    <p>Efficiency in cooling</p> Signup and view all the answers

    What is the purpose of a compressor in a refrigeration cycle?

    <p>To raise temperature through adiabatic compression</p> Signup and view all the answers

    What is the external work done on the working substance in a refrigerator cycle if 20% of the energy is extracted from the cold reservoir?

    <p>10%</p> Signup and view all the answers

    Which law of thermodynamics relates to the extraction of energy from the cold reservoir in a refrigerator?

    <p>Second law</p> Signup and view all the answers

    What is the coefficient of performance (COP) of a refrigerator when 20% of the energy extracted from the cold reservoir is used as external work?

    <p>5</p> Signup and view all the answers

    In a refrigeration cycle, what type of process occurs when the condenser temperature decreases?

    <p>Isentropic</p> Signup and view all the answers

    How does the efficiency of a heat engine relate to the coefficient of performance (COP) of a refrigerator?

    <p>They are inversely proportional</p> Signup and view all the answers

    Study Notes

    Refrigeration Cycle

    • Heat is rejected by the refrigerant in the condenser.
    • The refrigerant expands and its pressure and temperature decrease as it passes through the nozzle.

    Thermodynamics

    • The second law of thermodynamics deals with the direction of spontaneous processes.
    • The coefficient of performance (COP) of a refrigerator measures its efficiency in transferring heat from the cold reservoir to the hot reservoir.

    Energy Efficiency

    • If the COP of a refrigerator is 5, 20% of the energy is extracted from the cold reservoir, and 80% is used as external work.
    • The efficiency of a heat engine is 25% if it absorbs 3000 J from the hot reservoir and 2250 J are wasted per cycle.

    Refrigeration Process

    • The refrigerant absorbs heat at constant pressure in the evaporator.
    • A refrigerator releases heat to the air outside through the condenser.

    Magnetic Materials

    • Diamagnetic materials are repelled by a uniform magnetic field.

    Laws of Thermodynamics

    • The first law of thermodynamics states that energy is conserved.
    • The second law of thermodynamics relates to the extraction of energy from the cold reservoir in a refrigerator.

    Thermodynamic Processes

    • If dW = 0 and dQ = 0, the process is an isometric and adiabatic process.
    • The COP of a refrigerator measures the ratio of heat transferred from the cold reservoir to the work input.

    Compressor Function

    • The purpose of a compressor in a refrigeration cycle is to increase the pressure and temperature of the refrigerant.

    Work and Energy

    • If 20% of the energy is extracted from the cold reservoir, 80% is used as external work.

    Refrigerator Performance

    • If the condenser temperature decreases, the refrigeration process becomes more efficient.
    • The efficiency of a heat engine is inversely proportional to the COP of a refrigerator.

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    Description

    Learn about the steps that a refrigerant goes through in one complete cycle of refrigeration. Understand the process of expansion, reduction in pressure and temperature, and the transformation of liquid into gas. Test your knowledge with a quiz.

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