Class 4 (4th Engineer) MEP 📅 Nov 2022

Exam Question

(a) Sketch, describe and explain the operation of the domestic refrigeration system of a ship using R 22 gas as refrigerant. What kind of maintenance is essential for the system. (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) Lub oil low pressure cut out of the compressor

(iii) High pressure cut out of the compressor

(iv) Frosting in the compressor suction side

Reference Answer

### (a) Domestic Refrigeration System: Operation and Maintenance
#### Description and Operation
A ship's domestic refrigeration system operates on the vapour-compression refrigeration cycle. The purpose is to transfer heat from the refrigerated spaces (e.g., meat room, fish room, vegetable room) to a heat sink, typically the ship's cooling water system. The refrigerant used is R-22 (Chlorodifluoromethane), a hydrochlorofluorocarbon (HCFC).
The cycle consists of four main processes involving five key components:

Full answer on MeoMock — surveyor-grade reference answers for 7,000+ written exam questions.

View plans Browse library

← Browse more questions

Prepare on Android — MeoMock on Google Play