Exam Question
Explain vapor compression refrigeration cycle on T-S and P-H diagram and explain the purpose of EACH of the following:
(a) Expansion valve (4)
(b) Room thermostat (4)
(c) High pressure cut out. (4)
(d) Equalizing line. (4)
Class 2 (2nd Engineer)
MEKG
📅 Mar 2024
Reference Answer
### Vapor Compression Refrigeration Cycle on T-S and P-H Diagrams
The vapor compression refrigeration cycle is the most widely used method for producing a cooling effect. It operates based on the principle that a refrigerant absorbs latent heat of vaporization at a low temperature and pressure, and rejects this heat as latent heat of condensation at a high temperature and pressure. The cycle consists of four main processes involving four key components: Compressor, Condenser, Expansion Valve, and Evaporator.
**The Four Processes:**
1. **Process 1-2 (Isentropic Compression):**
The vapor compression refrigeration cycle is the most widely used method for producing a cooling effect. It operates based on the principle that a refrigerant absorbs latent heat of vaporization at a low temperature and pressure, and rejects this heat as latent heat of condensation at a high temperature and pressure. The cycle consists of four main processes involving four key components: Compressor, Condenser, Expansion Valve, and Evaporator.
**The Four Processes:**
1. **Process 1-2 (Isentropic Compression):**
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