Aircraft Air Conditioning System
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Questions and Answers

What is the purpose of the receiver-dryer in the vapour cycle machine?

  • To filter and dry the refrigerant (correct)
  • To condense the refrigerant
  • To compress the refrigerant
  • To expand the refrigerant
  • Why is it important to remove all moisture from the system?

  • To reduce the pressure drops in the evaporator
  • To improve the cooling efficiency
  • To prevent corrosion of the metal components
  • To prevent the formation of hydrochloric acid (correct)
  • What is the purpose of the sight glass in the receiver-dryer?

  • To filter the refrigerant
  • To indicate the amount of charge in the system (correct)
  • To expand the refrigerant
  • To indicate the pressure in the system
  • Where is the pickup tube located in the receiver-dryer?

    <p>At the top of the receiver-dryer</p> Signup and view all the answers

    What is the purpose of the filter in the receiver-dryer?

    <p>To prevent particles from entering the expansion valve</p> Signup and view all the answers

    What would happen if the charge in the system is low?

    <p>Bubbles would be seen in the sight glass</p> Signup and view all the answers

    What is the purpose of the desiccant in the receiver-dryer?

    <p>To dry the refrigerant</p> Signup and view all the answers

    What would happen if a single drop of water enters the system?

    <p>The water would react with the refrigerant to form hydrochloric acid</p> Signup and view all the answers

    Where is the receiver-dryer located in the system?

    <p>Between the condenser and the expansion valve</p> Signup and view all the answers

    What is the purpose of the condenser in the vapour cycle machine?

    <p>To condense the refrigerant</p> Signup and view all the answers

    Study Notes

    Vapour Cycle Air Conditioning System

    • The receiver-dryer serves as a reservoir for the liquid refrigerant and filters out moisture from the system.
    • It is located in the high side between the condenser and the expansion valve.

    Compressor and Refrigeration Cycle

    • The system is divided into two sides: the low side (accepts heat) and the high side (disposes of heat).
    • The compressor increases the pressure and temperature of the refrigerant vapour.
    • The refrigeration cycle starts at the receiver-dryer and flows through the expansion valve, evaporator, and compressor.

    Evaporator and Cooling Process

    • The evaporator is the unit that produces the cold air, where heat is absorbed by the refrigerant.
    • Warm air is blown through the thin metal fins that fit over the evaporator coils, and the heat is absorbed by the refrigerant.
    • When heat is absorbed, the refrigerant changes from a liquid to a gas without increasing its temperature.

    Refrigerant and System Requirements

    • R134a is the exclusively used refrigerant in aircraft applications due to its low environmental impact.
    • The refrigerant must be highly volatile (high vapour pressure and low boiling temperature).
    • Only the refrigerant specified in the aircraft manufacturer's maintenance manual should be used for servicing the system.

    Importance of Moisture Removal

    • Moisture must be removed from the system, as a single drop can freeze in the expansion valve and stop the entire air conditioning process.
    • Water reacts with the refrigerant to form hydrochloric acid, which is highly corrosive to the metal in the system.

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    Description

    This quiz covers the components and functioning of an aircraft air conditioning system, including the receiver-dryer, thermal expansion valve, and evaporator. Learn about the properties of refrigerants and their applications in aircraft.

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