Chapter 21: Q. 5 (page 594)
A refrigerator requires of work and exhausts of heat per cycle. What is the refrigerator’s coefficient of performance?
Short Answer
The refrigerator's coefficient of performance is
Chapter 21: Q. 5 (page 594)
A refrigerator requires of work and exhausts of heat per cycle. What is the refrigerator’s coefficient of performance?
The refrigerator's coefficient of performance is
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Get started for freeA heat engine uses a diatomic gas in a Brayton cycle. What is the engine's thermal efficiency if the gas volume is halved during the adiabatic compression?
A nuclear power plant generates of heat energy from nuclear reactions in the reactor’s core. This energy is used to boil water and produce high-pressure steam at . The steam spins a turbine, which produces of electric power, then the steam is condensed and the water is cooled to before starting the cycle again.
a. What is the maximum possible thermal efficiency of the power plant?
b. What is the plant’s actual efficiency?
c. Cooling water from a river flows through the condenser (the low-temperature heat exchanger) at the rate of ( million gallons per hour). If the river water enters the condenser at , what is its exit temperature?
A heat engine uses a diatomic gas that follows the cycle in FIGURE P.
a. Determine the pressure, volume, and temperature at point
b. Determine , and
for each of the three processes. Put your results in a FIGURE Ptable for easy reading.
c. How much work does this engine do per cycle and what is its thermal efficiency?
of work are done per cycle on a refrigerator with a coefficient of performance of . How much heat is (a) extracted from the cold reservoir and (b) exhausted to the hot reservoir per cycle?
Which, if any, of the heat engines in FIGURE EX 21.22 violate (a) the first law of thermodynamics or (b) the second law of thermodynamics? Explain.
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