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A cłosed system contains 3,.28 Ibm of water at saturated vapor, 40 psi ti und e...
Problem 6.024 SI Two kilograms of water contained in a piston-cylinder sembly, initially saturated vapor at...
Problem 6.024 SI Two kilograms of water contained in a piston-cylinder sembly, initially saturated vapor at 340 kPa, is condensed at constant pressure to saturated liquid. Consider an enlarged system consisting of the water and enough of the nearby surroundings that heat transfer occurs only at the ambient temperature of 25°C. Assume the state of the nearby surroundings does not change during the process, and ignore kinetic and potential energy effects For the enlarged system, determine the heat transfer, in...
2) A) Water, initially saturated vapor at 10.8 bar, fills a closed, rigid container. The water...
2) A) Water, initially saturated vapor at 10.8 bar, fills a closed, rigid container. The water is heated until its temperature is 200°C. For the water, determine the heat transfer, in kJ/kg. Kinetic and potential energy effects can be ignored. B) A piston-cylinder assembly contains 2 kg of water at 210.6oC and 3 bar. The water is compressed to a saturated vapor state where the pressure is 50.7 bar. During compression, there is a heat transfer of energy from the...
A 25.0 ft3 tank contains water at 200 psi, 400oF. A valve connects the tank to...
A 25.0 ft3 tank contains water at 200 psi,
400oF. A valve connects the tank to a pipe, which has
water flowing at 20 psi and 250oF. The valve is opened
and fluid is allowed to flow through the valve until the tank
conditions are 40 psi, 300oF. The valve is then closed.
The surroundings are at T0.
a. Calculate , the amount
of mass entering or leaving the tank, and , the change
in internal energy of the mass...
A frictionless-piston-cylinder device contains a liquid-vapor mixture of water at 200°C. During a constant- pressure process,...
A frictionless-piston-cylinder device contains a liquid-vapor mixture of water at 200°C. During a constant- pressure process, 500 kJ of heat is transferred to the surrounding air at 20°C. As a result, part of the water vapor contained in the cylinder condenses. a) Draw a schematic of your system including the boundary and all relevant energy transfer. (2 pts) b) Determine the entropy change of the water, in kJ/K. (3 pts) c) For the extended system (system + surroundings), write an...
3.) Two kilograms of saturated water vapor at 6 bar are contained in a piston cylinde...
3.) Two kilograms of saturated water vapor at 6 bar are contained in a piston cylinde r device. The water expands adiabatically until the pressure is 1 bar and is said t o produce 700 kJ of work output. a.) Determine the entropy change of the water, in kJ/kg:K b.) Is this process realistic?
3.) Two kilograms of saturated water vapor at 6 bar are contained in a piston cylinde...
3.) Two kilograms of saturated water vapor at 6 bar are contained in a piston cylinde r device. The water expands adiabatically until the pressure is 1 bar and is said t o produce 700 kJ of work output. a.) Determine the entropy change of the water, in kJ/kg:K b.) Is this process realistic?
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)
1. Saturated R134a vapor enters the uninsulated compressor of a home central air- conditioning system at...
1. Saturated R134a vapor enters the uninsulated compressor of a home central air- conditioning system at 4 °C. The flow rate of R134a through the compressor is 0.1 kg/s, and the electrical power input is 5 kW. The exit state is 65 °C with 1000 kPa. Any heat transfer from the compressor is to the ambient environment at 27 °C. a) Determine the rate of entropy production for the process in kW/K. b) If the change in enthalpy for the...
A mass of 5 kg of saturated liquid-vapor mixture of water is contained in a piston-...
A mass of 5 kg of saturated liquid-vapor mixture of water is contained in a piston- cylinder device at 125 kPa. Initially. 3 kg of the water is in the liquid phase and the rest is in the vapor phase. Heat is now transferred to the water, and the piston, which is resting on a set of stops, starts moving when the pressure inside reaches 300 kPa. Heat transfer continues until the total volume increases by 10%. We denote the...
Professor Modyn owns another piston-cylinder device, which initially (State 1) contains 0.236 m3 of saturated water...
Professor Modyn owns another piston-cylinder device, which initially (State 1) contains 0.236 m3 of saturated water vapor at 400.0 kPa. Heat is now slowly transferred to the steam until the volume doubles. Consider the expansion a two step process. First, constant volume heating occurs until the pressure reaches 500.0 kPa (State 2). Finally, a constant pressure expansion occurs resulting in the doubling of the initial volume (State 3) Note: The IUPAC sign convention for work is used. Work into the...
Problem 6.024 SI Two kilograms of water contained in a piston-cylinder sembly, initially saturated vapor at 340 kPa, is condensed at constant pressure to saturated liquid. Consider an enlarged system consisting of the water and enough of the nearby surroundings that heat transfer occurs only at the ambient temperature of 25°C. Assume the state of the nearby surroundings does not change during the process, and ignore kinetic and potential energy effects For the enlarged system, determine the heat transfer, in...
A 25.0 ft3 tank contains water at 200 psi,
400oF. A valve connects the tank to a pipe, which has
water flowing at 20 psi and 250oF. The valve is opened
and fluid is allowed to flow through the valve until the tank
conditions are 40 psi, 300oF. The valve is then closed.
The surroundings are at T0.
a. Calculate , the amount
of mass entering or leaving the tank, and , the change
in internal energy of the mass...
A frictionless-piston-cylinder device contains a liquid-vapor mixture of water at 200°C. During a constant- pressure process, 500 kJ of heat is transferred to the surrounding air at 20°C. As a result, part of the water vapor contained in the cylinder condenses. a) Draw a schematic of your system including the boundary and all relevant energy transfer. (2 pts) b) Determine the entropy change of the water, in kJ/K. (3 pts) c) For the extended system (system + surroundings), write an...
3.) Two kilograms of saturated water vapor at 6 bar are contained in a piston cylinde r device. The water expands adiabatically until the pressure is 1 bar and is said t o produce 700 kJ of work output. a.) Determine the entropy change of the water, in kJ/kg:K b.) Is this process realistic?
3.) Two kilograms of saturated water vapor at 6 bar are contained in a piston cylinde r device. The water expands adiabatically until the pressure is 1 bar and is said t o produce 700 kJ of work output. a.) Determine the entropy change of the water, in kJ/kg:K b.) Is this process realistic?
1. Saturated R134a vapor enters the uninsulated compressor of a home central air- conditioning system at 4 °C. The flow rate of R134a through the compressor is 0.1 kg/s, and the electrical power input is 5 kW. The exit state is 65 °C with 1000 kPa. Any heat transfer from the compressor is to the ambient environment at 27 °C. a) Determine the rate of entropy production for the process in kW/K. b) If the change in enthalpy for the...
A mass of 5 kg of saturated liquid-vapor mixture of water is contained in a piston- cylinder device at 125 kPa. Initially. 3 kg of the water is in the liquid phase and the rest is in the vapor phase. Heat is now transferred to the water, and the piston, which is resting on a set of stops, starts moving when the pressure inside reaches 300 kPa. Heat transfer continues until the total volume increases by 10%. We denote the...
Professor Modyn owns another piston-cylinder device, which initially (State 1) contains 0.236 m3 of saturated water vapor at 400.0 kPa. Heat is now slowly transferred to the steam until the volume doubles. Consider the expansion a two step process. First, constant volume heating occurs until the pressure reaches 500.0 kPa (State 2). Finally, a constant pressure expansion occurs resulting in the doubling of the initial volume (State 3) Note: The IUPAC sign convention for work is used. Work into the...
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