The superheating in a refrigeration cycle
A. Does not alter C.O.P.
B. Increases C.O.P.
C. Decreases C.O.P.
D. None of these
Answer: Option C
Solution(By Examveda Team)
The superheating in a refrigeration cycle Decreases C.O.P.This Question Belongs to Mechanical Engineering >> Refrigeration And Air Conditioning
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Comments ( 4 )
Nusselt number (NN) is given by
A. $${{\text{N}}_{\text{N}}} = \frac{{{\text{h}}l}}{{\text{k}}}$$
B. $${{\text{N}}_{\text{N}}} = \frac{{\mu {{\text{c}}_{\text{p}}}}}{{\text{k}}}$$
C. $${{\text{N}}_{\text{N}}} = \frac{{\rho {\text{V}}l}}{\mu }$$
D. $${{\text{N}}_{\text{N}}} = \frac{{{{\text{V}}^2}}}{{{\text{t}}{{\text{c}}_{\text{p}}}}}$$
In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = Bypass factor)
A. B.P.F. - 1
B. 1 - B.P.F.
C. $$\frac{1}{{{\text{B}}{\text{.P}}{\text{.F}}{\text{.}}}}$$
D. 1 + B.P.F.
The undesirable property of a refrigerant is
A. Non-toxic
B. Non-flammable
C. Non-explosive
D. High boiling point
The desirable property of a refrigerant is
A. Low boiling point
B. High critical temperature
C. High latent heat of vaporisation
D. All of these
@ishang is right. Effect of superheating on COP depends upon the type of refrigerant and it is found using mollier chart
Answer is ( D)none of these because super heating does not effect on COP but it perform to increase the life of a compressor
Superheating or undercharging me c.o.p. low hoti hai jabki subcooling or undercooling me c.o.p. high hoti hai
answer should be None of these as for R-12 refrigerant, COP increases but for Ammonia, it decreases.