Refrigeration components: In a vapour-compression system, the line drier's primary purpose is to remove moisture from the refrigerant circuit.

Difficulty: Easy

Correct Answer: Correct

Explanation:


Introduction / Context:
Moisture inside a refrigeration circuit causes ice formation at expansion devices, chemical reactions, and acid formation that damages compressors. A drier (often combined with a filter) is essential to system reliability.



Given Data / Assumptions:

  • System is a sealed vapour-compression loop.
  • Drier contains desiccant (e.g., molecular sieve, activated alumina).
  • Installed in the liquid line after the condenser/receiver.


Concept / Approach:
The drier removes dissolved and free moisture from the liquid refrigerant and traps particulates. Moisture removal prevents freeze-ups at the throttle device and limits hydrolysis that can create acids in the presence of POE oils and high temperatures.



Step-by-Step Solution:

Liquid refrigerant exits the condenser and passes through the filter-drier.Desiccant adsorbs water molecules, lowering moisture content to very low ppm levels.Clean, dry refrigerant then enters the expansion device, minimizing risk of ice formation and corrosion.Regular replacement after contamination events or burnouts is recommended.


Verification / Alternative check:
Sight-glass indicators often include a moisture dot. If it signals wet conditions, service practice is to replace the drier and evacuate the system properly.



Why Other Options Are Wrong:

  • “Incorrect” ignores standard refrigeration practice and manufacturer guidelines.
  • “Only in ammonia systems” is false; all refrigerants benefit from moisture control.
  • “Only for low temperature” is false; even comfort cooling needs dry circuits.


Common Pitfalls:
Assuming evacuation alone removes all moisture; oil and surfaces retain water which the drier scavenges during operation.



Final Answer:
Correct

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