Notes on Air Cooled Chiller

Introduction

• Types of chillers:
  • Water cooled chiller
  • Air cooled chiller
• Purpose: Lowers the temperature of water from the AHU (Air Handling Unit) and returns it.

Equipment in Chillers

• Both types consist of:
  • Compressor
  • Condenser
  • Expansion Valve
  • Evaporator

Differences between Chill Types

• Water Cooled Chiller:

  • Uses water from the cooling tower to reduce refrigerant temperature.

• Air Cooled Chiller:

  • Uses a fan motor to reduce refrigerant temperature.

Working Principle of Air-Cooled Chiller

Key Components

1. Evaporator

   • Functions as a heat exchanger.
   • Typically a shell and tube design:
     • Outer shell and internal coils.
   • Water from AHU flows through coils; refrigerant surrounds the coils.
   • Refrigerant absorbs heat from water, causing it to boil and turn into vapor.

2. Compressor

   • Sends vaporized refrigerant from the evaporator to the condenser.
   • Compresses the refrigerant, increasing its temperature and pressure.

3. Condenser

   • Contains coils and fan motors.
   • Refrigerant travels through coils while air is blown over them by fan motors.
   • Air removes heat from the refrigerant, lowering its temperature.

4. Expansion Valve

   • Receives refrigerant at high temperature and high pressure from the condenser.
   • Sprays refrigerant to expand it, reducing its temperature and pressure before it enters the evaporator.

Cycle Continuation

• The process repeats as the refrigerant flows back into the evaporator, maintaining a continuous cycle.

Additional Resources

• Links to videos explaining the working principle of Water-Cooled Chillers and individual components available in the description.

Conclusion

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