Class 4 (4th Engineer) MEP 📅 Jan 2023

Exam Question

(a) Sketch and Describe and explain the operation of the domestic refrigeration system of a ship using freon 22 gas as refrigerant. (8)

(b) Describe the causes for the following in the domestic refrigeration system: (8)

(i) Frequent cut-in and cut-out of the compressor

(ii) Compressor running hot

(iii) High pressure cut out of the compressor

(iv) Frosting in the compressor suction side

Reference Answer

### (a) Sketch, Description, and Operation of a Domestic Refrigeration System
A ship's domestic refrigeration system operates on the vapour compression cycle. It is designed to maintain low temperatures in provision rooms (meats, fish, vegetables, dairy) for the preservation of foodstuffs. The refrigerant used, Freon 22 (R22 or CHClF2), is a hydrochlorofluorocarbon (HCFC).
**Main Components:**
1. **Compressor:** This is the heart of the system, acting as a pump. It draws low-pressure, low-temperature refrigerant vapour from the evaporator and compresses it to a high-pressure, high-temperature superheated vapour.

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