Water is the working fluid in a Carnot vapor power cycle. Saturate liquid enters the boiler at a pressure of 10 MPa, and saturated vapor enters the turbine. The condenser pressure is 6 kPa. Determine (i) the thermal efficiency, (ii) the back work ratio, (iii) the heat transfer to the working fluid in the boiler, and (iv) the heat transfer from the working fluid in the condenser. In part B of the problem, irreversibilities in the adiabatic expansion and compression processes cannot be neglected. If the states at the turbine and pump inlet remain unchanged, repeat parts (i-iv) for the modified Carnot cycle with NT= 0.80 and Np = 0.70. Finally, calculate the rate of entropy generation in modified Carnot cycle having irreversibilities.

Water is the working fluid in a Carnot vapor power cycle. Saturate liquid enters the boiler at a pressure of 10 MPa, and saturated vapor enters the turbine. The condenser pressure is 6 kPa. Determine (i) the thermal efficiency, (ii) the back work ratio, (iii) the heat transfer to the working fluid in the boiler, and (iv) the heat transfer from the working fluid in the condenser. In part B of the problem, irreversibilities in the adiabatic expansion and compression processes cannot be neglected. If the states at the turbine and pump inlet remain unchanged, repeat parts (i-iv) for the modified Carnot cycle with NT= 0.80 and Np = 0.70. Finally, calculate the rate of entropy generation in modified Carnot cycle having irreversibilities.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter28: Special Refrigeration Applications

Section: Chapter Questions

Problem 15RQ: Why is two-stage compression popular for extra-low-temperature refrigeration systems?

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Concept explainers

Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.

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Please solve for the modified carnot cycle where it is unchanged for n_t = .8 and n_p = .7 and rate of entropy

Water is the working fluid in a Carnot vapor power cycle. Saturate liquid enters the boiler at a pressure of 10
MPa, and saturated vapor enters the turbine. The condenser pressure is 6 kPa. Determine (i) the thermal
efficiency, (ii) the back work ratio, (iii) the heat transfer to the working fluid in the boiler, and (iv) the heat
transfer from the working fluid in the condenser. In part B of the problem, irreversibilities in the adiabatic
expansion and compression processes cannot be neglected. If the states at the turbine and pump inlet remain
unchanged, repeat parts (i-iv) for the modified Carnot cycle with NT= 0.80 and Np = 0.70. Finally, calculate the
rate of entropy generation in modified Carnot cycle having irreversibilities.

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