The vapour compression refrigerator employs the following cycle
A. Rankine
B. Carnot
C. Reversed Rankine
D. Reversed Carnot
Answer: Option D
Solution(By Examveda Team)
The vapor compression refrigeration cycle employed by a typical refrigerator is a Reversed Rankine cycle. The Rankine cycle is commonly used in thermodynamic systems, especially in power plants, to convert heat energy into mechanical work. However, in a refrigeration system, the Rankine cycle is reversed to create a cooling effect.The basic components of a vapor compression refrigeration system include a compressor, a condenser, an expansion valve, and an evaporator. Here's how the Reversed Rankine cycle works in a refrigerator:
1. Compression: The low-pressure, low-temperature vapor from the evaporator is compressed by the compressor, increasing its pressure and temperature.
2. Condensation: The high-pressure, high-temperature vapor is then condensed to a liquid in the condenser, releasing heat to the surroundings.
3. Expansion: The high-pressure liquid refrigerant passes through an expansion valve, where its pressure and temperature drop significantly, causing it to partially vaporize.
4. Evaporation: The low-pressure, low-temperature vapor-liquid mixture enters the evaporator, where it absorbs heat from the refrigerated space, cooling it down.
Option A: The Rankine cycle is a thermodynamic cycle used in power plants, not refrigeration systems.
Option B: The Carnot cycle is a theoretical thermodynamic cycle that represents the maximum possible efficiency of a heat engine or refrigerator, but it is not typically used in practical refrigeration systems.
Option D: The Reversed Carnot cycle is a conceptually similar cycle to the Reversed Rankine cycle, but the Rankine cycle is more commonly associated with vapor compression refrigeration.
Therefore, the correct answer is Option C: Reversed Rankine, as it represents the cycle employed by a vapor compression refrigerator to provide cooling.
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Comments ( 2 )
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
C is right answer
The actual vapour compression cycle is based on Evans-Perkins cycle, which is also called as reverse Rankine cycle.