Options
A. 8.7250 kJ/K
B. 4.4476 kJ/K
C. -4.4475 kJ/K
D. None of above
Homework Answers
Add Answer to:
Options
A. 8.7250 kJ/K
B. 4.4476 kJ/K
C. -4.4475 kJ/K
D. None of above
1 kg...
What is the generated entropy (in kJ/K) when 1 kg of liquid water at 25°C is...
What is the generated entropy (in kJ/K) when 1 kg of liquid water at 25°C is heated to saturated vapor at 100°C in an oven that is at 150°C. Hint: the effect of pressure on the entropy of liquids or solids is usually negligible. Now assume you are trying to heat 1 kg of liquid water at 25°C to saturated vapor at 100°C, but you want to do it in an oven that is at 80°C. This is obviously impossible...
(a) An insulated piston cylinder device contains 5 L of saturated liquid water at a constant...
(a) An insulated piston cylinder device contains 5 L of saturated liquid water at a constant pressure of 150 kPa. The cylinder was equipped with the electric heater inside it. The liquid is heated at constant pressure until it becomes saturated vapour. Determine the entropy change of the water during this process in kJ/K. (10 Marks) (b) A stream of refrigerant R134a enters a steady flow device at 100 kPa, 50 °C at a rate of 1 kg/s. Two streams...
5 kg of water substance at 1 bar, 400 K, contained in a piston-cylinder apparatus, is...
5 kg of water substance at 1 bar, 400 K, contained in a piston-cylinder apparatus, is compressed to 10 bar, with heat transfer to a reservoir maintained at 350 K; the temperature of the water substance remains constant at 400 K. If the initial and final specific entropies of the water substance are: 7.502 kJ/kg-K and 1.600 kJ/kg-K respectively; (a)How much heat is removed? (b)What is the entropy change of the water substance? (c)What is the entropy change of the...
Question 1 A piston-cylinder assembly contains 3.2 kg of water at 211.9oC and 3 bar. The...
Question 1 A piston-cylinder assembly contains 3.2 kg of water at 211.9oC and 3 bar. The water is compressed to a saturated vapor state where the pressure is 51.5 bar. During compression, there is a heat transfer of energy from the water to its surroundings having a magnitude of 230 kJ. Neglecting changes in kinetic energy and potential energy, determine the work, in kJ, for the process of the water. Question 2 Water, initially saturated vapor at 10.2 bar, fills...
A, b, c please Answer A should be negative Answer B should be in KJ/K Question...
A, b, c please
Answer A should be negative
Answer B should be in KJ/K
Question 1 (of 10) value: 10.00 points 1 out of 3 attempts Assista Round your answers to six decimal places. Chec Six grams of computer chips with a specifie heat of 0.3 kl/kg-K are initially at 17°C. These Try A chips are cooled by placement in8 grams of saturated liquid R-134a at -38°C. Presuming that the pressure remains constant while the chips are being cooled,...
S Q. Find the entropy and/or temperature of steam at the following states Region k/kg K) 5 MPa 1 ...
s Q. Find the entropy and/or temperature of steam at the following states Region k/kg K) 5 MPa 1 MPa 18 MPa 400°C 40 kPa 40 kPa 120°C 50°C Quality, x-09, Mixed 71794 (<7.6700) Q. Determine the entropy change of water contained in a closed system as it changes phase rom saturated liquid to saturated vapor when the pressure is 0.1MPa and constant Why is the entropy change positive for this process? 2. Steam at 1 MPa, 6000C expands in...
1)(Hint: Cp=1.005 kJ/kg-K, Cv=0.718 kJ/kg-K, R=0.287 kJ/kg-K). An air-tight room contains 80 kg of air, and...
1)(Hint: Cp=1.005 kJ/kg-K, Cv=0.718 kJ/kg-K, R=0.287 kJ/kg-K). An air-tight room contains 80 kg of air, and a 2-kW baseboard electric resistance heater in the room is turned on and kept on for 15 min. The temperature rise of air at the end of 15 min is 2)An example of when it is appropriate to model a substance as an ideal gas is when a. The pressure and temperature are close to the critcal point b. The pressure and temperature are...
Answer: W/m=20.94kJ/kg Q/m=1705 kJ/kg Applying the Energy Balance Referring to Fig. P3.71, water contained in a...
Answer: W/m=20.94kJ/kg
Q/m=1705 kJ/kg
Applying the Energy Balance Referring to Fig. P3.71, water contained in a piston-cylinder assembly, initially at 1.5 bar and a quality of 20%, is heated at constant pressure until the piston hits the stops. Heating then continues until the water is saturated vapor. Show the processes of the water in series on a sketch of the 7-vdiagram. For the overall process of the water, evaluate the work and heat transfer, each in kJ/kg. Kinetic and potential...
7. Steam leaves an industrial boiler at 827.4kPa and 171.6°C (hf = 727.25 kJ/kg, hfg =...
7. Steam leaves an industrial boiler at 827.4kPa and 171.6°C (hf = 727.25 kJ/kg, hfg = 2043.2 kJ/kg ). A portion of the steam is passed through a throttling calorimeter and is exhausted to the atmosphere when the calorimeter pressure is 101.4 kPa and a temperature of 115.6°C (h= 2707.6 kJ/kg ). How much moisture does the steam leaving the boiler contain ? 8. During the polytropic process of an ideal gas, the state changes from 138 kPa and 5°C...
Ulston cylinder device contains a liquid-vapor xture at 300K. During a constant pressure added to water....
Ulston cylinder device contains a liquid-vapor xture at 300K. During a constant pressure added to water. As a result some of the liquid vaporizes. the entropy change? ure process. 750 kJ of heat is What is b.4 kJ/K c. 2.5 kJ/k d. 0.4 kJ/K 14. In which of the following processes does entropy change? a. Reversible adiabatic b. Isentropic Process procesS c. Internally reversible d. Constant-pressure expansion process process through a real turbine 15. A piston cylinder device contains superheated...
(a) An insulated piston cylinder device contains 5 L of saturated liquid water at a constant pressure of 150 kPa. The cylinder was equipped with the electric heater inside it. The liquid is heated at constant pressure until it becomes saturated vapour. Determine the entropy change of the water during this process in kJ/K. (10 Marks) (b) A stream of refrigerant R134a enters a steady flow device at 100 kPa, 50 °C at a rate of 1 kg/s. Two streams...
A, b, c please
Answer A should be negative
Answer B should be in KJ/K
Question 1 (of 10) value: 10.00 points 1 out of 3 attempts Assista Round your answers to six decimal places. Chec Six grams of computer chips with a specifie heat of 0.3 kl/kg-K are initially at 17°C. These Try A chips are cooled by placement in8 grams of saturated liquid R-134a at -38°C. Presuming that the pressure remains constant while the chips are being cooled,...
s Q. Find the entropy and/or temperature of steam at the following states Region k/kg K) 5 MPa 1 MPa 18 MPa 400°C 40 kPa 40 kPa 120°C 50°C Quality, x-09, Mixed 71794 (<7.6700) Q. Determine the entropy change of water contained in a closed system as it changes phase rom saturated liquid to saturated vapor when the pressure is 0.1MPa and constant Why is the entropy change positive for this process? 2. Steam at 1 MPa, 6000C expands in...
Answer: W/m=20.94kJ/kg
Q/m=1705 kJ/kg
Applying the Energy Balance Referring to Fig. P3.71, water contained in a piston-cylinder assembly, initially at 1.5 bar and a quality of 20%, is heated at constant pressure until the piston hits the stops. Heating then continues until the water is saturated vapor. Show the processes of the water in series on a sketch of the 7-vdiagram. For the overall process of the water, evaluate the work and heat transfer, each in kJ/kg. Kinetic and potential...
7. Steam leaves an industrial boiler at 827.4kPa and 171.6°C (hf = 727.25 kJ/kg, hfg = 2043.2 kJ/kg ). A portion of the steam is passed through a throttling calorimeter and is exhausted to the atmosphere when the calorimeter pressure is 101.4 kPa and a temperature of 115.6°C (h= 2707.6 kJ/kg ). How much moisture does the steam leaving the boiler contain ? 8. During the polytropic process of an ideal gas, the state changes from 138 kPa and 5°C...
Ulston cylinder device contains a liquid-vapor xture at 300K. During a constant pressure added to water. As a result some of the liquid vaporizes. the entropy change? ure process. 750 kJ of heat is What is b.4 kJ/K c. 2.5 kJ/k d. 0.4 kJ/K 14. In which of the following processes does entropy change? a. Reversible adiabatic b. Isentropic Process procesS c. Internally reversible d. Constant-pressure expansion process process through a real turbine 15. A piston cylinder device contains superheated...
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