The simple vapour compression cycle is a highly utilized refrigeration system for both domestic and industrial applications, employing a refrigerant that condenses and evaporates near atmospheric conditions. It offers advantages such as smaller size, lower running costs, and high coefficient of performance, but has drawbacks including high initial costs and leakage prevention challenges. The system consists of four main components: evaporator, compressor, condenser, and expansion valve, and involves specific processes for refrigerant evaporation, compression, condensation, and expansion.

1. Simple Vapour Compression
Cycle
Prepared by Kaushal Patel

2. Simple Vapour Compression System
• The simple vapour compression is most
popular and widely used in refrigeration and
air condition for both domestics and industrial
application.
• It is generally used for all purpose for small
domestic refrigerator to a big industrial air
conditioning plant.

3. • A vapour compression refrigeration system is an
improved type of refrigeration system in which a
suitable working substance, termed of
refrigerant is used. It condensed and evaporates
at temperature and pressure close to the
atmospheric condition.
• This refrigerant is usually used for
ammonia,carbon dioxide and sulphur dioxide.

4. VCR Cycle Advantages
• It is less smaller size for given capacity of
refrigeration.
• It has less running cost.
• The coefficient of performance is quite high.

5. VCR Cycle Disadvantage
• The initial cost is high.
• The prevention of leakage of refrigerant is the
major problem in VCR.

6. VCR Cycle Components
• Most common refrigeration cycle in use today.
• There are four principal control volumes involving
these components:
Evaporator
Compressor
Condenser
Expansion valve
• All energy transfers by work and heat are taken as
positive in the directions of the arrows on the
schematic and energy balances are written
accordingly.

7. Two-phase
liquid-vapor mixture
Schematic Diagram of VCR Cycle

8. Processes of VCR Cycle
• Process 4-1: Two-phase liquid-vapor mixture of
refrigerant is evaporated through heat transfer
from the refrigerated space.
• Process 1-2: Vapor refrigerant is compressed to a
relatively high temperature and pressure
requiring work input.
• Process 2-3: Vapor refrigerant condenses to liquid
through heat transfer to the cooler surroundings.
• Process 3-4: Liquid refrigerant expands to the
evaporator pressure.

9. T-s Diagram When Vapour is Dry And
Saturated After Compression

10. T-s Diagram of When Vapour is Super
Heated After Compression

11. T-s Diagram When Vapour is Wet After
Compression

12. C.O.P of VCR System
• 𝐶. 𝑂. 𝑃 =
𝑅𝑒𝑓𝑟𝑖𝑔𝑒𝑟𝑎𝑡𝑖𝑛𝑔 𝑒𝑓𝑓𝑎𝑐𝑡
𝑊𝑜𝑟𝑘 𝑑𝑜𝑛𝑒
• 𝐶. 𝑂. 𝑃 =
ℎ2−ℎ1
ℎ3−ℎ2

13. THANK YOU