Question

500 kg of saturated liquid at 11 MPA is heated at constant pressure until it reaches a temperature of 450 C find the following: a. enthalpy entropy and specific volume at the end of the process b. change in entropy in kj/kg k of the process c. amount of heat needed for the process

Answer #1

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Air with a mass of 2 kg is heated at a constant pressure of
200 kPa to a temperature
of 500°C. Calculate the entropy change if the initial volume
is 0.8 m3. Take ???? =
1.00 kJ/kg ? K and model air as an ideal gas. (Hint: Use the
appropriate TdS [Gibbs] relation to calculate entropy
change.)

1 kg of water in a piston cylinder arrangement is initially in a
saturated liquid state at 1 bar. It undergoes expansion at constant
pressure due to external heat supply to it, to a final state of
saturated vapor.
(i) What is the initial temperature of water in C? (a) 93.50 (b)
96.71 (c) 99.63 (d) 111.4 (e) 12.2
(ii) What is the change in enthalpy of water (kJ/kg-K)? (a)
417.46 (b) 2258.0 (c) 2675.5 (d) 2506.1
(iii) What is...

Saturated liquid water at 60 bar is heated until the quality is
43%.
Calculate the amount of heat (kJ/kg) that needs to add into the
system.

A mass of one kg of water within a piston–cylinder assembly
undergoes a constant-pressure process from saturated vapor at 500
kPa to a temperature of 260°C. Kinetic and potential energy effects
are negligible. For the water:
a) Evaluate the work, in kJ,
b) If the work is 30 kJ, evaluate the heat transfer, in kJ,
c) If the heat transfer is negligible, evaluate the entropy
production in kJ/K
d) Determine if the process is reversible, irreversible, or
impossible.

2 kg of steam initially at 2.00 MPa and 225?C expands in a
piston-cylinder assembly until the final pressure is 0.10 MPa.
During the process, the temperature of steam is kept constant by
keeping it in a constant temperature atmosphere at 225?C. a. What
is the maximum amount of work that can be produced? What is the
entropy change of steam? What is the entropy change of the
universe? b. Suppose that the actual work done is 80% of the...

A vertical, insulated piston cylinder is filled with saturated
liquid H2O at 50 kPa. A stirrer moves rapidly inside the cylinder
until 22% of the H2O (by mass) evaporates. Determine the net work
done (in kJ/kg), the change in entropy during this process (in
kJ/kg-K) and the entropy generated during this process (in
kJ/kg-K).

A piston cylinder device contains a mixture of 0.2 kg of H2 and
1.6 kg of N2 at 100 kPa and 300K. Heat is now transferred to the
mixture at constant pressure unitl the volume is doubled. Assuming
constant specific heats at the average temperature (the constant
pressure specific heats of H2 and N2 are 14.501 kJ/kg°K and 1.049
kJ/kg°K, respectively), determine: a) the heat transfer. b) the
entropy change of the mixture.

Saturated steam at a gauge pressure of 3.00 bar is to be used to
heat a stream of ethane. The ethane enters a heat exchanger at 16°C
and 1.5 bar gauge pressure at a rate of 895 m3/min and
is heated at constant pressure to 93°C. The steam condenses and
leaves the exchanger as a liquid at 24.0°C. The specific enthalpy
of ethane at the given pressure is 941 kJ/kg at 16°C and 1073 kJ/kg
at 93°C.
You may take...

13)One mole of neon gas is heated from 358 K to 426 K at
constant pressure. Note that neon has a molar specific heat of
c = 20.79 J/mol · K for a constant–pressure process.
(a) Calculate the energy Q transferred to the
gas.
kJ
(b) Calculate the change in the internal energy of the gas.
kJ
(c) Calculate the work done on the gas.
kJ

Entropy From Steam Tables
A piston-cylinder assembly contain 2 kg of water. The water is
initially at the pressure of 0.5 MPa and the temperature of 300°C.
The water is cooled down at constant pressure process until it is a
saturated vapor. Determine the change in the entropy of the
system.

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