Question

The hot and cold reservoirs of a Carnot engine are 273°C and 71.7°C respectively. The temperature...

The hot and cold reservoirs of a Carnot engine are 273°C and 71.7°C respectively. The temperature of the hot reservoir is raised by 43°C in order to increase the efficiency of the engine. (a) What is the efficiency after the increase in temperature? .41 Incorrect: Your answer is incorrect. % (b) Instead of raising the temperature of the hot reservoir, if the temperature of the cold reservoir is decreased by 43°C, what would be the efficiency of the engine? %

Science   Physics   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

a)

Temperature of hot reservoir is

T h= 273+43 =316oC

in Kelvin

T=316+273.15=589.15 K

Temperature of Cold reservoir is

Tc = 273.15+71.7 =344.85 K

The carnot efficiency is given by

in percentage is

%

b)

Now

Temperature of hot reservoir is

T h= 273+273.15 =546.15 K

Temperature of Cold reservoir is

Tc = 344.85 -43 =301.85 K

Therefore

%

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A Carnot engine is operated between constant temperature reservoirs, TC and TH. The operator wishes to...
A Carnot engine is operated between constant temperature reservoirs, TC and TH. The operator wishes to increases the efficiency of the engine. If only one reservoir can be changed by a given amount for either reservoir, which is better: lowering the cold reservoir or raising the hot reservoir? (Hint: Think about how the efficiency changes when you change one of the two temperature reservoirs.)
A Carnot engine operates with an efficiency of 23% when the temperature of its cold reservoir...
A Carnot engine operates with an efficiency of 23% 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 41%? K
A Carnot engine has an efficiency of 35.4%. It operates between constant-temperature reservoirs differing in temperature...
A Carnot engine has an efficiency of 35.4%. It operates between constant-temperature reservoirs differing in temperature by 100 C°. In kelvins, what are (a)the temperature of the hot reservoir and (b) the temperature of the cold reservoir?
A Carnot engine operates with an efficiency of 30%. The temperature of the cold reservoir remains...
A Carnot engine operates with an efficiency of 30%. The temperature of the cold reservoir remains at 10 degrees C A.) Calculate the temperature of the hot reservoir? B.) By how much does the temperature in the hot reservoir need to be raised so that the efficiency of the engine becomes 50%. Express your answer in degrees Celsius.
The exhaust temperature of a heat engine is 290 ∘C∘C . What must be the high...
The exhaust temperature of a heat engine is 290 ∘C∘C . What must be the high temperature if the Carnot efficiency is to be 23 %% ? Express your answer using two significant figures. A heat engine uses a heat source at 500 ∘C∘C and has an ideal (Carnot) efficiency of 28 %% . To increase the ideal efficiency to 42 %% , what must be the temperature of the heat source? An ideal Carnot engine is operated between a...
Problem 21.28 A Carnot engine whose hot-reservoir temperature is 420 ∘C has a thermal efficiency of...
Problem 21.28 A Carnot engine whose hot-reservoir temperature is 420 ∘C has a thermal efficiency of 40 % . Part A By how many degrees should the temperature of the cold reservoir be decreased to raise the engine's efficiency to 61 % ? Express your answer to two significant figures and include the appropriate units. ΔTcold =
2) A heat engine operates between two fixed temperature reservoirs, TH = 127 0C, TC =...
2) A heat engine operates between two fixed temperature reservoirs, TH = 127 0C, TC = 7 0C. In each cycle 5 J are extracted from the hot reservoir and 4 J are deposited into the cold reservoir. [ 0 0C = 273 K] (a) How much work is performed by the engine per cycle ? (4) (b) What is the efficiency of the engine ? (4) (c) What is the entropy change of the hot reservoir during one cycle...
The hot reservoir for a Carnot engine has a temperature of 933 K, while the cold...
The hot reservoir for a Carnot engine has a temperature of 933 K, while the cold reservoir has a temperature of 326 K. The heat input for this engine is 7160 J. The 326-K reservoir also serves as the hot reservoir for a second Carnot engine. This second engine uses the rejected heat of the first engine as input and extracts additional work from it. The rejected heat from the second engine goes into a reservoir that has a temperature...
A Carnot engine of efficiency 43% operates with a cold reservoir at 28°C and exhausts 1210...
A Carnot engine of efficiency 43% operates with a cold reservoir at 28°C and exhausts 1210 J of heat each cycle. What is the entropy change for the hot reservoir?
We have a Carnot engine operating between a hot reservoir A and a cold reservoir B....
We have a Carnot engine operating between a hot reservoir A and a cold reservoir B. The work produced in the engine is used to power a flywheel. The hot reservoir is boiling water at p0 = 1 bar and Ta = 373K. The cold reservoir is a block of ice at p0 and Tb = 273K (latent heat = 3.3E5 J/kg). For the flywheel we know that Inertiamoment = 2kg m^2, mass = 6kg, c = 418J/kg K. Final...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT