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Class 2 (2nd Engineer) MEP 📅 Apr 2022

Exam Question

(a) With the aid of a simple sketch, explain the "trouble spots" in a basic air-conditioning unit.

(b) With reference to your sketch in (a), explain following:

(i) How the problem of increase in humidity of cooled air is overcome?

(ii) How discomfort caused by the excessive drying effect of heated air overcome?

Exam question diagram

Reference Answer

Trouble Spots in a Basic Air Conditioning Unit
Refrigerant Leakage: Commonly occurs at the compressor shaft seal, condenser, dryer, oil separator, evaporator coils, or damaged pipes.
Condenser: Insufficient water or air flow and dirty tubes may cause high-pressure (HP) trip.
Filters: Blocked intake and recirculation filters lead to poor airflow.

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