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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 ratio of m2 / m1 for the following arrangement?
If, m1 = Mass of refrigerant passing through the evaporator
m2 = Mass of refrigerant passing through condenser
2. What is the value of C.O.P. of high-temperature cascade system in terms of intermediate temperature in the following diagram?
If TEL and TCL = Evaporator and condenser temperatures for low-temperature cascade system
TEH and TCH = Evaporator and condenser temperatures for high-temperature cascade system
3. Find the coefficient of performance when the refrigeration effect (Re) is 145.7 and the work done (W) is 32.46 KJ.
4. Why multi-stage or compound VCR with intercooler is used?
5. 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?
6. Which of the following is not a disadvantage of multiple compressions with intercooling between the stages?
7. Which one of the following is not an advantage of water intercooling when used in a multi stage compression?
8. 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?
9. How is the cascade system achieved?
10. Why multi-stage or compound VCR with water intercooler and liquid sub-cooler is used?
11. What is the purpose of using intercooler?
12. 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
13. 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?
14. What is the effect of condenser temperature on total B.P.?
15. The refrigeration capacity decreases with the decrease in the evaporator or suction temperature.
16. Why is multi-stage or compound VCR with water intercooler, liquid sub-cooler, and flash intercooler used?
17. What does low boiling refrigerants ensure?
18. 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
19. Why is multi-stage or compound VCR with water intercooler, liquid sub-cooler, and the flash chamber used?
20. What is the purpose of using liquid sub-cooler?
21. 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?
22. The heat taken and given by the flash chamber is same.
23. What is the purpose of using a flash chamber?
24. What is the effect of condenser temperature on B.P. per tonne of refrigeration?
25. What is the relation between m1, m2, and m3?
If m1 = mass of refrigerant passing through the evaporator
m2 = mass of refrigerant passing through the condenser
m3 = mass of liquid evaporated in the intercooler