FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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Problem 3.091 SI
Carbon dioxide (CO2) is compressed in a piston–cylinder assembly from p1 = 0.7 bar, T1 = 280 K to p2 = 8 bar. The initial volume is 0.2 m3. The process is described by pV1.25 = constant.Assuming ideal gas behavior and neglecting kinetic and potential energy effects, determine the work and heat transfer for the process, each in kJ, using constant specific heats evaluated at 300 K, and data from Table A-23.
A mole of ideal gas at state 1(P=1.00 bar, T=25.0° C, V=0.02479 m³) underwent two thermodynamic paths: (Path A) heating at constant volume to 1490.75K followed by (Path B ) cooling at constant pressure to reach state 2(P=5.00 bar, T=25.0 ° , V=0. 00496 m³). Calculate for the change of in internal energy, change in enthalpy, heat and work for the whole thermodynamic process. The specific heat of an ideal gas at constant pressure (Cp) is 29.099 J/mol-K and it's specific heat at constant volume (Cv) is 20.785 J/mol-k
Complete the following for Table 1: H20 and show the process on a T-v or P-v diagram for
each of the phase described.
On a T-v or P-v diagram, sketch for the following process:
- From state 1→ state 2
- From state 3 → state 4
- From state 4 → state 5
Table 1
v,
m/kg kJ/kg
u,
kJ/kg kJ/kg.K
State
P,
т,
X,
h,
s,
Phase
КРа
°C
%
1
800
719.97
2
1750
6.3877
3
69.09
4.832
1
4
2000
400
500
230
5.
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- A closed, rigid tank fitted with a paddle wheel contains 2.0 kg of air, initially at 200°C, 1 bar. During an interval of 10 minutes, the paddle wheel transfers energy to the air at a rate of 1 kW. During this time interval, the air also receives energy by heat transfer at a rate of 0.5 kW. These are the only energy transfers. Assume the ideal gas model for the air, and no overall changes in kinetic or potential energy. Do not assume specific heats are constant. Determine the change in specific internal energy for the air, in kJ/kg, and the final temperature of the air, in °C.arrow_forward1. Butane (MW=58), is a type of hydrocarbon commonly used as fuel for portable stoves. The gas is held in a 20 Liter cylindrical container. Butane is stored initially at a pressure of 15 bar and at room temperature of 30°C. If the pressure limit for the container, (also known as bursting pressure) is 120 bar, determine the maximum temperature allowed (in Kelvin) for the gas inside, also, determine the mass (in kg) of butane.arrow_forward2. Given a closed container of volume 1 L containing 50 g of helium gas, calculate the following: a. The pressure at T = 6 K, assuming that the gas is an ideal gas. b. The pressure at T of state. = 6 K, assuming that the gas obeys van der Waal's equation c. The pressure at T 6 K, assuming that the gas obeys the virial equation of state truncated after the second term. = d. The state of the fluid at T = 4.2 K. (Hint: 4.2 K is below T. and 50 kg/m³ is greater than p, @ 4.2 K.)arrow_forward
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