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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. The complete desuperheating of the vapor refrigerant is not possible in case of water intercooling.
2. What is the purpose of using intercooler?
3. What is the purpose of using liquid sub-cooler?
4. What is the purpose of using a flash intercooler?
5. 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?
6. The heat taken and given by the flash chamber is same.
7. What is the purpose of using intercooler?
8. What does low boiling refrigerants ensure?
9. Multiple refrigerants can be used in the cascade refrigeration system.
10. What is the purpose of using liquid sub-cooler?
11. 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 the condenser
12. What is the purpose of using a flash chamber?
13. 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
14. What is Cryogenics?
15. A compound vapour compression with an intercooler system is used to take 10 TR of refrigeration load (Q). The power required for the refrigerating system P is 550 KW. What is its COP?
16. A compound vapor compression with a liquid subcooler and a liquid intercooler system is used to take 10 TR of refrigeration load (Q). The power required for the refrigerating system P is 557.7 W. What is its COP?
17. The water intercooling reduces the work to be done in low pressure compression.
18. What is the effect of condenser temperature on B.P. per tonne of refrigeration?
19. Why is multi-stage or compound VCR with water intercooler, liquid sub-cooler, and the flash chamber used?
20. Which of the following is not a disadvantage of multiple compressions with intercooling between the stages?
21. 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
22. What is Intermediate temperature?
23. What is the value of Refrigeration effect if m2 = 2 kg/min, m3 = 0.8 kg/min and enthalpies for the refrigerant at saturated vapor and saturated liquid line are 1420 and 1260 kJ/kg?
24. 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
25. Which one of the following is not an important parameter in the design of a refrigerant reciprocating compressor?