5.00 kg of liquid water at 100 kPa is heated from 20 C to 80 C...
5.00 kg of liquid water at 100 kPa is heated from 20 C to 80 C on the stove. Neglecting evaporation of the water, determine the entropy change of the water.
Assume cv= 4.20 kJ/(kg-K)
Homework Answers
Liquid water at 300 kPa and 25°C is heated in a chamber by mixing it with...
Liquid water at 300 kPa and 25°C is heated in a chamber by mixing it with steam at 300 kPa and 200°C as in the figure below. Liquid water enters the chamber at a rate of 3.0 kg/s, and the chamber is estimated to lose heat to the surrounding air at 25°C at a rate of 35 kW. If the mixture leaves the mixing chamber at 300 kPa and 120°C, establish: a. Mass flow rate of the superheated steam, kg/s...
Liquid water at 300 kPa and 20°C is heated in a chamber by mixing it with...
Liquid water at 300 kPa and 20°C is heated in a chamber by mixing it with hot water at 300 kPa and 90°C. Cold water enters the chamber at a rate of 1.8 kg/s. If the mixture leaves the mixing chamber at 60°C, determine the mass flow rate of the hot water required
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 well-insulated rigid tank contains 2 kg of a saturated liquid-vapor mixture of water at 100 kPa
A well-insulated rigid tank contains 2 kg of a saturated liquid-vapor mixture of water at 100 kPa. Initially, three-quarters of the mass is in the liquid phase. An electric resistance heater placed in the tank is now turned on and kept on until all the liquid in the tank is vaporized. Determine the entropy change of the steam during this process. Answer: 8.10 kJ/K Analysis From the steam tables (Tables A-4 through A-6)
Question 11 A piston cylinder-device contains 12 kg of steam at 100 kPa and 175°C. Over...
Question 11 A piston cylinder-device contains 12 kg of steam at 100 kPa and 175°C. Over time, the steam in the piston-cylinder device isobarically loses heat to its surroundings until it reaches a temperature of 99.61"C and all the vapor in the piston has condensed into liquid. a. Determine the entropy change of the steam, in kJ/K b. For the steam and its surroundings, determine the total entropy change associated with this process, in kJ/K. The temperature of the surroundings...
A piston/cylinder setup contains 1 kg of water at 150 kPa, 20-C. 3000 kJ of heat...
A piston/cylinder setup contains 1 kg of water at 150 kPa, 20-C. 3000 kJ of heat is added from a 600-C source until the water is at 1 MPa, 500.C. Find the total change in entropy, in kJ/K. Add a negative sign (-) in your numerical answer should you get a negative answer.
A steam of 80% quality at 300 KPa and a mass of 3 Kg is heated...
A steam of 80% quality at 300 KPa and a mass of 3 Kg is heated at constant pressure until the temperature increased 66.5 C. 1. Calculate the change in entropy due to the heating process. 2. Determine if the process reversable, irreversible or impossible. 3. Plot the TS diagram showing all the states and numbers on it.
Liquid water flows steadily through a work producing device with a mass flow rate of 100...
Liquid water flows steadily through a work producing device with a mass flow rate of 100 kg/s. At the inlet the conditions are: p1=1000 kPa, T1=25 deg-C, Vel1 = 30 m/s. At the exit, p2=100 kPa, u2= u1 (specific internal energy remains constant), and Vel2 = 20 m/s. Assume no heat transfer, no change in elevation between the inlet and exit, and density of water to be 1000 kg/m3. (a). Determine the power produced (w/o neglecting the effect of change...
(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...
2. (5 Points) 3-kg of air (an ideal gas) is heated in a piston-cylinder device from...
2. (5 Points) 3-kg of air (an ideal gas) is heated in a piston-cylinder device from 17°C to 117°C at a constant pressure of 100 kPa. Determine the entropy change in kJ/K, assuming: a. Constant specific heat. b. Variable specific heat.
Liquid water at 300 kPa and 25°C is heated in a chamber by mixing it with steam at 300 kPa and 200°C as in the figure below. Liquid water enters the chamber at a rate of 3.0 kg/s, and the chamber is estimated to lose heat to the surrounding air at 25°C at a rate of 35 kW. If the mixture leaves the mixing chamber at 300 kPa and 120°C, establish: a. Mass flow rate of the superheated steam, kg/s...
Liquid water at 300 kPa and 20°C is heated in a chamber by mixing it with hot water at 300 kPa and 90°C. Cold water enters the chamber at a rate of 1.8 kg/s. If the mixture leaves the mixing chamber at 60°C, determine the mass flow rate of the hot water required
Question 11 A piston cylinder-device contains 12 kg of steam at 100 kPa and 175°C. Over time, the steam in the piston-cylinder device isobarically loses heat to its surroundings until it reaches a temperature of 99.61"C and all the vapor in the piston has condensed into liquid. a. Determine the entropy change of the steam, in kJ/K b. For the steam and its surroundings, determine the total entropy change associated with this process, in kJ/K. The temperature of the surroundings...
A piston/cylinder setup contains 1 kg of water at 150 kPa, 20-C. 3000 kJ of heat is added from a 600-C source until the water is at 1 MPa, 500.C. Find the total change in entropy, in kJ/K. Add a negative sign (-) in your numerical answer should you get a negative answer.
(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...
2. (5 Points) 3-kg of air (an ideal gas) is heated in a piston-cylinder device from 17°C to 117°C at a constant pressure of 100 kPa. Determine the entropy change in kJ/K, assuming: a. Constant specific heat. b. Variable specific heat.
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