Question

This is a steam table problem.One kilogram of liquid water at 20°C is placed in a frictionless piston that will keep a constant pressure of 5 bar. Heat is added until the final volume is 473 times the original volume.

a) How much heat was added(to the nearest whole number)? kJ

b) How much work was done (to the nearest whole number)?

Answer #1

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This is a steam table problem.One kilogram of liquid water at
20°C is placed in a frictionless piston that will keep a constant
pressure of 5 bar. Heat is added until the final volume is 473
times the original volume.
a) How much heat was added(to the nearest whole
number)? kJ
b) How much work was done (to the nearest whole number)?

A cylinder fitted with a frictionless, massless piston contains
compressed liquid water at a temperature T1=20C. The atmospheric
pressure on the outside of the system is P=1.0 bar. Heat is then
added until the water is completely converted to saturated
vapor.
(a) What are the changes in specific volume, v2-v1
(m3/kg) and internal energy, u2-u1 (kJ/kg) of the water
for this process?
(b) How much specific work, if any, is done by the system?
(c) What is the amount of...

A piston-cylinder apparatus contains 4 kg of saturated liquid
water at 35˚C. The piston’s cross sectional area is 0.06 m2 , and
initially it is resting on stops, enclosing a volume of 0.03 m3 .
To raise the piston, a pressure of 300kPa has to be applied. Heat
is transferred until the volume is 0.075 m3 , at which point the
piston encounters a linear spring. To deflect the spring 1 m, a
force of 360 kN is required. More...

Steam has 1.0 MPa, 80% dryness-2 fraction,This steam
is placed in a piston cylinder at constant pressure and heated
until its final volume became 0.2 m3. So, the amount of .heat
transfer 687.25 kJ O -687.25kJ O 788.83 kJ O -788.83 kJ
You need a solution within ten minutes necessary

Water undergoes a constant‐volume process within a
piston–cylinder assembly from saturated liquid at 4 bar to a final
pressure of 50 bar. Kinetic and potential energy effects are
negligible. Determine the work and the heat transfer, each in kJ
per kg of water. [7 points]

A 0.4-L glass of water at 20°C is to be cooled with ice to 5°C.
The density of water is 1 kg/L, and the specific heat of water at
room temperature is c = 4.18 kJ/kg·°C. The specific heat
of ice at about 0°C is c = 2.11 kJ/kg·°C. The melting
temperature and the heat of fusion of ice at 1 atm are 0°C and
333.7 kJ/kg.
A) Determine how much ice needs to be added to the water, in...

steam is contained in a piston and cylinder assemble at a
pressure of 5 bar and temperature of 700 degrees celcius. At this
initial condition, the cylinder is restrained by stops since the
pressure is applied on piston only supprts a pressure of 3 bar in
the cylinder. The initial volume of system is 1m^3 and cooling is
applied to the system until final volume is 0.1m^3. Determine work
and heat transfer.

A well-insulated (no heat transfer) piston cylinder contains 2
kg of saturated water vapor at 1 MPa. Steam expands reversibly
until the pressure drops to 0.5 MPa. Find the final temperature of
water and the work done during the expansion in kJ.

Consider 1 kilogram of saturated water at 70 degrees celsius in
a closed and rigid container which is heated to steam (superheated
water) at 300 degrees celsius and 5 MPa by adding 1500 kJ of
heat.
a) What is the fraction of vapour and liquid at the initial
state?
b) What is the work done as a result of the heating process?

In a piston cylinder device, initially 0.005 m3 liquid water and 0.9 m3 water vapor are at equilibrium at 600 kPa. Heat is given at constant pressure until the final temperature reaches 200 ° C.
(a) Show the process in the P-v and T-v diagram
(b) What is the initial temperature of the water?
(c) Find the total mass of water
(d) Calculate the final volume

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