An engine operates between a hot reservoir (T- 500°C) and a cold reservoir (T 300°C). What...
An engine has a hot reservoir temperature of 927 K and a cold reservoir temperature of 631 K. The engine operates at four-fifths maximum efficiency. What is the efficiency of the engine?
A gas-cooled nuclear reactor operates between hot and cold reservoir temperatures of 670°C and 20.0°C. (a) What is the maximum efficiency (in percent) of a heat engine operating between these temperatures? % (b) Find the ratio of this efficiency to the Carnot efficiency of a standard nuclear reactor (47.6%). Eff Eff (b)
1. A Carnot engine has a hot reservoir at 250 degrees C, and a a cold reservoir at 25.0 degrees C. What is the efficiency of this engine? A) 10% B) 43% C) 57% D) 90% 2. A heat engine does 50 J of work and dumps 30 J of heat into the cold reservoir. How much heat was absorbed from the hot reservoir? A) 20 J B) 30 J C) 50 J D) 80 J 3. A heat engine...
A Carnot engine operates with an efficiency of 29% when the temperature of its cold reservoir is 295 K. Assuming that the temperature of the hot reservoir remains the same, what must be the temperature of the cold reservoir in order to increase the efficiency to 33%?
A Carnot engine operates with a cold reservoir at a temperature of TL = 400 K and a hot reservoir at a temperature of TH = 500 K. What is the net entropy change as it goes through a complete cycle?
*7. If the hot reservoir of the engine in the previous problem is 300 K and the cold reservoir is at 200 K, what is the Carnot efficiency of this engine? Should it be bigger or smaller than the efficiency in the previous problem? Is it? 8. If one walks inside a flat-bottomed boat from bow to stern, the boat moves in the water. In which direction, and why? You are trapped offshore in a canoe without a paddle, but...
Paragraph Styles 1) Steam engines operate between a cold temperature reservoir at 30°0c and a hot temperature reservoir at 565°C. a. What is their maximum possible efficiency? b. A steam locomotive is an example of steam engine. The real efficiency of these locomotives was about 8%. Can you list a number of causes that bring the efficiency down so dramatically?
A power cycle operates between hot and cold reservoirs at 600 K and 300 K, respectively. At steady state the cycle develops a power output of 0.45 MW while receiving energy by heat transfer from the hot reservoir at the rate of 1 MW. (a) Determine the thermal efficiency and the rate at which energy is rejected by heat transfer to the cold reservoir, in MW. (b) Compare the results of part (a) with those of a reversible power cycle...
A heat engine extracts 51 kJ from the hot reservoir and exhausts 30 kJ into the cold reservoir. Part A What is the work done? ANSWER: Part B What is the efficiency?
5. A certain heat engine operates between 1000 K and 500 K a) What is the maximum efficiency of the engine? (ANS: 0.5) b) Calculate the maximum work that can be done per kJ of heat supplied by the hot source. (ANS: 0.5 kJ) c) How much heat is discharged into the cold sink in a reversible process for each kJ supplied by the hot source? (ANS: 0.25)