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A standard vapour compression refrigeration cycle consists of the following 4 thermodynamic processes in sequence:
- a)Isothermal expansion, isentropic compression, isothermal compression and isentropic expansion
- b)Constant pressure heat addition, isentropic compression, constant pressure heat rejection and isentropic expansion
- c)Isothermal expansion, constant pressure heat addition, isothermal compression and constant pressure heat rejection
- d)none of these
Correct answer is option 'B'. Can you explain this answer?
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A standard vapour compression refrigeration cycle consists of the foll...
-Constant pressure heat addition, isentropic compression, constant pressure heat rejection and isentropic expansion is the correct sequence.
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A standard vapour compression refrigeration cycle consists of the foll...
Explanation:
The correct answer is option B, which states that a standard vapor compression refrigeration cycle consists of the following four thermodynamic processes in sequence:
1. Constant pressure heat addition
2. Isentropic compression
3. Constant pressure heat rejection
4. Isentropic expansion
Process 1: Constant pressure heat addition
In this process, the refrigerant enters the compressor as a low-pressure vapor and is compressed to a high-pressure vapor. During compression, heat is added to the refrigerant from an external source at a constant pressure. This process increases the temperature and enthalpy of the refrigerant.
Process 2: Isentropic compression
After constant pressure heat addition, the high-pressure vapor enters the condenser. In the condenser, the refrigerant is condensed into a high-pressure liquid by rejecting heat to the surroundings at a constant pressure. This process reduces the temperature and enthalpy of the refrigerant.
Process 3: Constant pressure heat rejection
The high-pressure liquid then enters the expansion valve, where it undergoes a throttling process. In this process, the pressure of the refrigerant is reduced, causing a decrease in temperature and enthalpy. The refrigerant exits the expansion valve as a low-pressure liquid.
Process 4: Isentropic expansion
Finally, the low-pressure liquid enters the evaporator, where it absorbs heat from the surroundings at a constant pressure. This process causes the refrigerant to evaporate into a low-pressure vapor, increasing its temperature and enthalpy.
Conclusion
The four processes in the correct sequence ensure efficient heat transfer, refrigerant compression, and expansion, resulting in the desired cooling effect. Option B correctly represents the standard vapor compression refrigeration cycle.
The correct answer is option B, which states that a standard vapor compression refrigeration cycle consists of the following four thermodynamic processes in sequence:
1. Constant pressure heat addition
2. Isentropic compression
3. Constant pressure heat rejection
4. Isentropic expansion
Process 1: Constant pressure heat addition
In this process, the refrigerant enters the compressor as a low-pressure vapor and is compressed to a high-pressure vapor. During compression, heat is added to the refrigerant from an external source at a constant pressure. This process increases the temperature and enthalpy of the refrigerant.
Process 2: Isentropic compression
After constant pressure heat addition, the high-pressure vapor enters the condenser. In the condenser, the refrigerant is condensed into a high-pressure liquid by rejecting heat to the surroundings at a constant pressure. This process reduces the temperature and enthalpy of the refrigerant.
Process 3: Constant pressure heat rejection
The high-pressure liquid then enters the expansion valve, where it undergoes a throttling process. In this process, the pressure of the refrigerant is reduced, causing a decrease in temperature and enthalpy. The refrigerant exits the expansion valve as a low-pressure liquid.
Process 4: Isentropic expansion
Finally, the low-pressure liquid enters the evaporator, where it absorbs heat from the surroundings at a constant pressure. This process causes the refrigerant to evaporate into a low-pressure vapor, increasing its temperature and enthalpy.
Conclusion
The four processes in the correct sequence ensure efficient heat transfer, refrigerant compression, and expansion, resulting in the desired cooling effect. Option B correctly represents the standard vapor compression refrigeration cycle.
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A standard vapour compression refrigeration cycle consists of the following 4 thermodynamic processes in sequence:a)Isothermal expansion, isentropic compression, isothermal compression and isentropic expansion b)Constant pressure heat addition, isentropic compression, constant pressure heat rejection and isentropic expansion c)Isothermal expansion, constant pressure heat addition, isothermal compression and constant pressure heat rejectiond)none of theseCorrect answer is option 'B'. Can you explain this answer?
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