Class 4 (4th Engineer) MEKG 📅 Jan 2024

Exam Question

With reference to a typical shipboard refrigeration sysiem:

(a) Sketch the arrangement which controls superheat temperature of reingerant gas leaving the evaporator (8)

(b) Describe the operation of the arrangement sketched in (a) assuming one of the HFC refrigerant is the working medium (4)

Reference Answer

### (a) Sketch of a Thermostatic Expansion Valve (TEV) with External Equalizer
The arrangement which controls the superheat temperature of the refrigerant gas leaving the evaporator is the Thermostatic Expansion Valve (TEV). The sketch would show the following key components in cross-section and their connections:
1. **TEV Body**: Housing the valve mechanism.
2. **Inlet**: Connected to the liquid line from the receiver/condenser.

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