Answer EKG Question 17
Q17.
(a) Detail the desirable properties of a refrigerant. (b) Make a table
and compare following refrigerants for use in a provision cooling plant
for a 50000 DWT Oil tanker: R-22, R-134a.
Answer:-
Desirable properties:-
1. Moderate condensing pressure so that a system of light construction and low pressure can be used.
2. High critical temperature so that early condensation can be acheived.
3. Low specific heat of the liquid. as the throttling at expansion valve causes liquid refrigerant to be cooled at the expanse of partial evaporation.
4. High latent heat of vaporization so that less refrigerant may be circulated to perform a given duty.
5. Non corrosive
6. Chemically stable.
7. Non-Flammable & Non-explosive.
8. World wide availability.
9. Miscible with oil.
10. Environmental friendly.
11. Non-Toxic
12. Heat transfer characterstics.
13. Easy detect for leakage.
Answer:-
Desirable properties:-
1. Moderate condensing pressure so that a system of light construction and low pressure can be used.
2. High critical temperature so that early condensation can be acheived.
3. Low specific heat of the liquid. as the throttling at expansion valve causes liquid refrigerant to be cooled at the expanse of partial evaporation.
4. High latent heat of vaporization so that less refrigerant may be circulated to perform a given duty.
5. Non corrosive
6. Chemically stable.
7. Non-Flammable & Non-explosive.
8. World wide availability.
9. Miscible with oil.
10. Environmental friendly.
11. Non-Toxic
12. Heat transfer characterstics.
13. Easy detect for leakage.
Comparison
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