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Refrigeration and Air Conditioning Practice Test: Compound Vapour Compression Refrigeration Systems
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Compound Vapour Compression Refrigeration Systems topics include: Two multi stage compression with liquid intercooling, water intercooling and liquid subcooling, cascade systems and refrigerant reciprocating compressor performance characteristics. Compound vapour compression refrigeration systems use a method called intercooling to cool the superheated vapor refrigerant before feeding it to the second stage of compression. Liquid refrigerant is often used for intercooling in multi-stage ammonia plants, but not in multi-stage R-12 plants.  Compound compression is used when the compression... Show more
Refrigeration and Air Conditioning Practice Test: Compound Vapour Compression Refrigeration Systems
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25 Questions

1. What is the purpose of using intercooler?
2. What is the purpose of using intercooler?
3. The complete desuperheating of the vapor refrigerant is not possible in case of water intercooling.
4. What is the value of work done for the following arrangement?
If, m1 = Mass of refrigerant passing through the evaporator
m2 = Mass of refrigerant passing through condenser
m3 = Mass of vapor refrigerant formed in the flash chamber
5. What is the effect of condenser temperature on compressor refrigerating capacity?
6. The effect of suction temperature on the compressor B.P. per tonne of refrigeration is?
7. What does low boiling refrigerants ensure?
8. What is the purpose of using liquid sub-cooler?
9. What is the value of the load on the evaporator in terms of TR if the power required to drive the system is 25 kW and C.O.P. is 4?
10. What is the ratio of the mass of refrigerant flowing through condenser and mass of refrigerant flowing through the evaporator, i.e., m2 / m1?
If m1 = mass of refrigerant passing through the evaporator
m2 = mass of refrigerant passing through the condenser
11. If the compound vapour compression system is working under the load on the evaporator of 15 TR, the enthalpies corresponding to the evaporator are 1400 and 400 kJ/kg respectively. What is the value of the mass flow rate through the evaporator?
12. Which intermediate refrigerants were used for the first time in the cascade system?
13. Why intercooling by liquid refrigerant never used in R-12 systems?
14. The refrigeration effect produced by a system is 10 TR and work done by the low-pressure compressor, and high-pressure compressor is 3 and 4 kW respectively. What is the value of C.O.P. for the given conditions?
15. What is the purpose of using a flash intercooler?
16. What is the ratio of m3 / m2 for the following arrangement?
If, m1 = Mass of refrigerant passing through the evaporator
m2 = Mass of refrigerant passing through condenser
m3 = Mass of vapor refrigerant formed in the flash chamber
17. Why multi-stage or compound VCR with water intercooler and liquid sub-cooler is used?
18. What is the purpose of using intercooler?
19. By using flash chambers the total work done per kg of refrigerant is reduced.
20. What is the value of work done for the following arrangement?
If, m1 = Mass of refrigerant passing through the evaporator
m2 = Mass of refrigerant passing through condenser
21. How is the cascade system achieved?
22. Why is such a type of arrangement used in ammonia plants?
23. How is a cascade system structured?
24. Multiple refrigerants can be used in the cascade refrigeration system.
25. Cascade refrigeration system reduces the C.O.P.