Question

Air in a tank undergoes a heating process from 25°C to 100°C.
Assuming that air behaves as an ideal gas with constant specific
heat, find the change in specific enthalpy and specific internal
energy for the process.

Answer #2

answered by: anonymous

Air is heated from 25 C to 140C prior to entering a combustion
furnace. the change in specific enthalpy associated with this
transition is 3349 j/mol. The flow rate of air at the heater oulet
is 1.65 m^3/min and air pressure is 122Kpa apsolute.
a) Calculate the heat requirements in kW, assuming ideal gas
behavior and that the kinetic and potential energy changes from the
heater inlet to the outlet are negilible.
b) would the value of the cahnge in...

1-kg of R-134a initially at 600 kPa and 25 °C undergoes a
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pressure drops to 100 kPa. Determine the final temperature of the
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A piston-cylinder assembly containing 3 kg of an ideal gas
undergoes a constant pressure process from an initial volume of 48
m3 to a final volume of 30 m3 . During the
process, the piston supplies 1.2 MJ of work to the gas. The gas has
a constant specific heat at constant volume of 1.80 kJ/(kg∙K) and a
specific gas constant of 1.48 kJ/(kg∙K). Neglect potential and
kinetic energy changes.
a. Determine the initial specific volume of the gas in...

a 4kg of air initially at 295k and 325 kpa, is heated at
constent pressure in a poston-cylinder device. the final
temperature of the air is 405k. assuming the air behaves as an
ideal gas with constant specific heat, determine the amount of heat
added during the process.

A gas undergoes a process in a piston–cylinder assembly during
which the pressure-specific volume relation is
pv1.2 = constant. The mass of the gas
is 0.4 lb and the following data are known: p1
= 160 lbf/in.2, V1 = 1
ft3, and p2 = 300
lbf/in.2 During the process, heat transfer from
the gas is 2.1 Btu. Kinetic and potential energy effects are
negligible. Determine the change in specific internal energy of the
gas, in Btu/lb.
Δu=

Air is contained in a rigid, well-insulated container
of volume 3 m3. The air undergoes a process from
an initial state with a pressure of 200 kPa and temperature of 300
K. During the process, the air
receives 720 kJ of work from a paddle wheel. Model the air as an
ideal gas with constant specific
heats. Evaluate the specific heats at 300 K. Neglect changes in
kinetic energy and potential energy.
Determine the mass of the air in kg,...

N moles of this gas undergoes the following cyclical process
composed of four reversible steps:
i. Isovolumetric cooling from state 1 (T1 and P1) to State 2 (T2
and P2);
ii. Isothermal expansion from state 2 (T2 and P2) to state 3 (T2
and P3);
iii. Isovolumetric heating from state 3 (T2 and P3) back to
state 4 (T4 and P4); and
iv. Adiabatic compression from state 4 (T4 and P4) to state 1
(T1 and P1).
We know that...

Your new engine design consists of a piston cylinder
arrangement. The engine operates with mostly air and a small amount
of fuel. The system undergoes a cycle. The initial Pressure and
temperature are p1= 1bar and T1= 27°C. The system undergoes a power
cycle consisting of the following process:
Process
1-2
constant volume to a pressure, P2 of 4 bars
Process
2-3
expansion of pv=constant
Process 3-1
constant-pressure compression
Draw the system and pv diagrams
If P2 is 4...

Assume that one mole of a monatomic (CV,m = 2.5R) ideal gas
undergoes a reversible isobaric expansion at 1 bar and the volume
increases from 0.5 L to 1 L. (a) Find the heat per mole, the work
per mole done, and the change in the molar internal energy, ΔUm,
the molar enthalpy, ΔHm, for this process. b) What are the entropy
changes ΔSm of the system and of the surroundings? Is this process
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1 mole of a gas undergoes a mechanically reversible isothermal
expansion from an initial volume 1 liter to a final volume 10 liter
at 25oC. In the process, 2.3 kJ of heat is absorbed in the system
from the surrounding. The gas follows the following formula:
V=RTP+b where V is the molar specific volume, and Tand Pare
temperature (abosolute) and gas pressure respectively. Given R=
8.314 J/(mol.K) and b= 0.0005 m3. Evaluate the following a) Work
(include sign) b) Change...

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