Question
In: Mechanical Engineering
Problem1. A piston cylinder device containing 0.5 kg of water has initial volume of 0.5L. The...
Problem1. A piston cylinder device containing 0.5 kg of water has initial volume of 0.5L. The device starts and goes through a Carnot cycle and generates 500.3 kJ work. If the maximum temperature that water will reach is 1.5 times the minimum temperature of water and during heat rejection process, water goes from saturated vapor to saturated liquid phase. Find: 1. QH & QL for this cycle (10 points). 2. TH & TL for this cycle (10 points). 3. Maximum and minimum pressures that the cycle will reach (20 points). 4. Show this process on a T-v diagram and label temperature, pressures and specific volumes. (To get full points, your states, and your processes should be accurately placed in relation to isobaric lines and vapor dome) (10 points). 5. The expansion and compression of water in this device are quasi-equilibrium processes, EXPLAIN why this process delivers the highest amount of work (5 points). 6. Find the pressure at remaining state(s) (Bonus 5 points)
Solutions
samet mamat answered 2 years agoRelated Solutions
A piston cylinder device containing 0.5 kg of water has initial volume of 0.5L. The device...
A piston cylinder device containing 0.5 kg of water has
initial volume of 0.5L. The device starts and goes through a Carnot
cycle and generates 500.3 kJ work. If the maximum temperature that
water will reach is 1.5 times the minimum temperature of water and
during heat rejection process, water goes from saturated vapor to
saturated liquid phase
Find:
1. QH & QL for this cycle (10 points).
2. TH & TL for this cycle (10 points).
3. Maximum and...
A piston cylinder device containing 0.5 kg of water has initial volume of 0.5L. The device...
A piston cylinder device containing 0.5 kg of water has initial
volume of 0.5L. The device starts and goes through a Carnot cycle
and generates 500.3 kJ work. If the maximum temperature that water
will reach is 1.5 times the minimum temperature of water and during
heat rejection process, water goes from saturated vapor to
saturated liquid phase. Find:
1. QH & QL for this cycle .
2. TH & TL for this cycle.
3. Maximum and minimum pressures that...
A spring-loaded piston-cylinder device contains 0.5 kg of water initially at 90℃ and with an initial quality of 20.9%.
A spring-loaded piston-cylinder device contains 0.5 kg of water initially at 90℃ and with an initial quality of 20.9%. At its initial state, the spring is relaxed and does not exert any force on the piston. The device is now heated until the pressure is 400 kPa and the new temperature is 250℃.
What is the boundary work done by the water during this process?
kJ
What is the total amount of heat transfer into the system?
kJ
BONUS: If...
The volume of 1 kg of helium in a piston-cylinder device is initially 7 m3 ....
The volume of 1 kg of helium in a piston-cylinder device is
initially 7 m3 . Now helium is compressed to 3 m3 while its
pressure is maintained constant at 150 kPa. Determine the initial
and final temperatures of helium as well as the work required to
compress it, in kJ. You may assume deal gas behavior.
A piston-cylinder device initially has a volume of 1.5 m3 containing steam at 300 kPa absolute...
A piston-cylinder device initially has a volume of 1.5 m3
containing steam at 300 kPa absolute and 150 oC. It is then heated
so it expands at constant pressure until it reaches a temperature
of 400 oC.
Draw a diagram of the device showing system boundary and flows
of energy. What boundary work is done by the cylinder, in kJ,
during the expansion? State your assumptions.
1. What is the mass of steam in the piston-cylinder?
2. How much heat...
A piston with a volume of 0.5 m ^ 3 contains 0.9 kg of water at...
A piston with a volume of 0.5 m ^ 3 contains 0.9 kg of
water at a pressure of 0.2 MPa. Heat is transferred to the cylinder
until the temperature of the steam at constant pressure is 250 ° C.
What happens if the change in kinetic and potential energy is
neglected?
A piston with a volume of 0.5 m ^ 3 contains 0.9 kg of
water at a pressure of 0.2 MPa. Heat is transferred to the cylinder
until...
0.5 kg of R12 are contained in a piston/cylinder and has a quality of 75% and...
0.5 kg of R12 are contained in a piston/cylinder and has a
quality of 75% and a temperature of 0 C. Heat is transferred at
constant pressure until the R12 is a saturated vapor. Determine: a)
the initial volume of the R12; b) the work done; c) the heat
transfer; d) the T-v diagram.
Ans:
a) 0.0208 m3 b) 2.13 kJ c) 18.9 kJ
Air of 0.5 kg mass is compressed in a piston-cylinder device from 300 K, 120 kPa...
Air of 0.5 kg mass is compressed in a piston-cylinder device
from 300 K, 120 kPa to 500K, 940 kPa. (a) Determine the entropy
change in kJ/K using (i) approximate analysis and (ii) exact
analysis. (b) Determine the direction of heat transfer (into the
device or out of the device).
100 kg of R-134a at 320 kPa are contained in a piston-cylinder device whose volume is...
100 kg of R-134a at 320 kPa are contained in a piston-cylinder
device whose volume is 7.530 m3. The piston is now moved
until the volume is one-half its original size. This is done such
that the pressure of the R-134a does not change. Determine the
final temperature and the change in the total internal energy of
the R-134a. (Round the final answers to two decimal places.)
100 kg of R-134a at 200 kPa are contained in a piston–cylinder device whose volume is...
100 kg of R-134a at 200 kPa are contained in a piston–cylinder
device whose volume is 12.766 m3. The piston is now
moved until the volume is one-half its original size. This is done
such that the pressure of the R-134a does not change. Determine the
final temperature and the change in the total internal energy of
R-134a. Use data from the steam tables.
The final temperature is °C.
The total change in internal energy is kJ/kg.
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