Solving Heat Engine Problem: Power Output Calculation

AI Thread Summary
The discussion revolves around calculating the power output of a heat engine with a hot reservoir of steam at 100°C and a cold reservoir of ice at 0°C. In 1.3 seconds, 12 grams of steam condenses and 59 grams of ice melts, which are critical for determining the heat transferred (Qh and Qc). The thermal efficiency (n) is calculated using the formula n = 1 - (T_c/T_h), where temperatures are converted to Kelvin. Participants emphasize the need for clarity on the units associated with the time and mass values provided. The melting and condensing data are essential for accurately calculating the power output of the engine.
abro369
Messages
1
Reaction score
0

Homework Statement



The hot reservoir of a heat engine is steam at 100 while the cold reservoir is ice at 0. In 1.3 of operation, 12 of steam condenses and 59 of ice melts.
What is the power output of the heat engine?

Homework Equations



W=Q_h - Q_c
n=W/Q_h=1 - (T_c/T_h)
Q=ML

The Attempt at a Solution



All I could think to do was solve for the thermal coefficient.
n=1-(273/373)

I'm not sure where to go from here.
 
Physics news on Phys.org
abro369 said:

Homework Statement



The hot reservoir of a heat engine is steam at 100 while the cold reservoir is ice at 0. In 1.3 of operation, 12 of steam condenses and 59 of ice melts.
What is the power output of the heat engine?
Please tell us what units go with these numbers!
Okay, it's fairly obvious the temperatures are in degrees Celsius, but you do need to tell us what units go with the 1.3, 12, and 59.

Hint: the condensing and melting info is useful for finding Qh and Qc.
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Engine working between multiple temperature baths worse than Carnot
Replies
1
Views
1K
B Heat pump as a heat engine that operates in reverse
Replies
19
Views
4K
Maximum work done by a Carnot engine
Replies
6
Views
5K
Carnot Heat Engine: Solve for Heat Expelled to Cold Res.
Replies
2
Views
5K
Solving Heat Engine & Refrigerator Problems
Replies
2
Views
2K
What is the change in entropy of the water in a reversible heat engine?
Replies
4
Views
1K
Calculating the Efficiency of a Heat engine
Replies
32
Views
4K
I try to solve a thermodynamics problem on heat transfer
Replies
3
Views
2K
How to Calculate Energy and Work in a Stirling Cycle?
Replies
3
Views
4K
Chemistry Work done by heat engine that uses exhaust from heat pump
Replies
9
Views
2K

Hot Threads

Recent Insights

Back
Top