Exam Question
(a) Make a detailed sketch of a Ships domestic refrigeration system. (8)
(b) Give a full description of such a Refrigeration System, explaining the purpose of the relevant control and safety devices. (8)
Class 4 (4th Engineer)
MEKG
📅 Jan 2025
Reference Answer
### (a) Detailed Sketch of a Ship's Domestic Refrigeration System
A detailed sketch should be a schematic line diagram illustrating the vapor compression cycle adapted for a multi-room domestic plant. The diagram must clearly show the direction of refrigerant flow and the relative positions of all principal components, controls, and safety devices. It should depict a single compressor and condenser serving multiple refrigerated rooms (e.g., Meat Room, Fish Room, Vegetable Room), each with its own evaporator and expansion valve. The vegetable room circuit should specifically include a back pressure regulating valve.
**Key elements to include in the sketch:**
1. **High-Pressure Side (Discharge Line):** Compressor, Oil Separator, High-Pressure Cutout Switch, Condenser, Receiver, Bursting Disc/Relief Valve on Condenser/Receiver.
A detailed sketch should be a schematic line diagram illustrating the vapor compression cycle adapted for a multi-room domestic plant. The diagram must clearly show the direction of refrigerant flow and the relative positions of all principal components, controls, and safety devices. It should depict a single compressor and condenser serving multiple refrigerated rooms (e.g., Meat Room, Fish Room, Vegetable Room), each with its own evaporator and expansion valve. The vegetable room circuit should specifically include a back pressure regulating valve.
**Key elements to include in the sketch:**
1. **High-Pressure Side (Discharge Line):** Compressor, Oil Separator, High-Pressure Cutout Switch, Condenser, Receiver, Bursting Disc/Relief Valve on Condenser/Receiver.
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