FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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Students have asked these similar questions
Four kilograms of a two-phase liquid-vapor mixture of water initially at 300°C and x, = 0.5 undergo the two different processes
7.33
described below. In each case, the mixture is brought from the initial state to a saturated vapor state, while the volume remains constant. For
each process, determine the change in exergy of the water, the net amounts of exergy transfer by work and heat, and the amount of exergy
destruction, each in kJ. Let To = 300 K, Po =1 bar, and ignore the effects of motion and gravity. Comment on the difference between the exergy
destruction values.
a. The process is brought about adiabatically by stirring the mixture with a paddle wheel.
Answer
b. The process is brought about by heat transfer from a thermal reservoir at 610 K. The temperature of the water at the location where the
heat transfer occurs is 610 K
Answer
If the specific exergy of a gas in a cylinder of
an internal combustion engine modeled as air
behaving like an ideal gas is 368.91 kJ / kg
and the cylinder contains 2450 cm2 of
gaseous combustion products.
Åt what elevation in meters 3-kg mass does it
have to be lifted from zero elevation with
respect to the reference environment so that
its exergy equals the exergy of the cylinder?
Assume gravity as g = 9.81 m /s^2
NOTE: The density of dry air at a pressure of 7
bar and a temperature of 867 ° C is 2.1388 kg
/ m^3.
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- A balloon filled with helium at 20°C, 1 bar and a volume of 0.5 m³ is moving with a velocity of 15 m/s at an elevation of 0.5 km relative to an exergy reference environment for which To = 20°C, po = 1 bar. Using the ideal gas model with k = 1.67, determine the specific exergy of the helium, in kJ.arrow_forwardA domestic water heater holds 189 L of water at 60°C, 1 atm. Determine the exergy of the hot water, in kJ. To what elevation, in m, would a 1000-kg mass have to be raised from zero elevation relative to the reference environment for its exergy to equal that of the hot water? Let To = 298 K, po = 1 atm, g = 9.81 m/s².arrow_forwardA domestic water heater holds 189 L of water at 60°C, 1 atm. Determine the exergy of the hot water, in kJ. To what elevation, in m, would a 1000-kg mass have to be raised from zero elevation for its exergy to equal that of the hot water? Let T0 = 298 K, p0 = 1 atm, g = 9.81 m/s2 .arrow_forward
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- At steady state, an electric pump motor develops power along its output shaft of 0.7 hp whiledrawing 6 amps at 100 V. The outer surface of the motor is at 150°F. Let T = 40°F.Determine: (a) the magnitude of the rate of heat transfer leaving the motor, in Btu/h.(b) the exergy flow with input power, exergy flow with output power, magnitude of exergy flowwith heat transfer leaving the motor, and exergy destruction, all in Btu/h.arrow_forwardExergy flow associated with a fluid stream when the fluid properties are variable can be determined by.arrow_forwardFour kilograms of a two-phase liquid-vapor mixture of water initially at 300°C and x1= 0.3 undergo the two different processes described below. In each case, the mixture is brought from the initial state to a saturated vapor state, while the volume remains constant. For each process, determine the change in exergy of the water, the net amounts of exergy transfer by work and heat, and the amount of exergy destruction, each in kJ. Let To = 300K, po 1 bar, and ignore the effects of motion and gravity. Comment on the difference between the exergy destruction values. a. The process is brought about adiabatically by stirring the mixture with a paddle wheel.arrow_forward
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