Liquid water at 15 ℃ is heated by mixing it with saturated steam
at the same pressure. Liquid water enters a chamber at a rate of
4.3 kg/s and saturated steam enters at a rate of 0.17 kg/s. The
mixture leaves the mixing chamber as a saturated liquid at 40℃. If
the surroundings are at 15℃, determine (a) the temperature of the
saturated steam entering the chamber, (b) the exergy destruction
during this mixing process, and (c) the second-law efficiency...
A mass of 5 kg of saturated liquid vapor mixture of water is
contained in a piston cylinder device at 100 kPa, initially 2 kg of
water is in the liquid phase and the rest is in the vapor
phase.Heat is now transferred to the water and the piston which is
resting on a set of stops, starts moving when the pressure in side
reaches 200 kPa, heat transfer continues until the total volume
increases by 20%, determine a. the...
1) Saturated liquid water at a pressure of 10 kPa is sent to a
steam boiler with a pressure of 4MPa with a reversible adiabatic
pump and heated up to 500oC at constant pressure in the boiler. The
mass flow of the steam is 4.2 kg / s. Transactions are carried out
continuously.
a) Show the processes on the T-v or T-s diagram with saturated
vapor and liquid curves.
b) Calculate the required pump power
c) Calculate the amount of...
1.) Saturated liquid water flowing at 3kg/s is initialy at 30
bar.
a.) this steam is throttled through a valve to 9 bar. What is
the vapor fraction of the steam after the valve?
b.) afterwards, 6.0 MW is added to the steam. What is the final
temperature of the steam?
What is the entropy change for this heating, in kW/K?
A piston-cylinder device contains a saturated mixture of steam
and water having a total mass of 0.5 kg at a pressure of 160 kPa
and an initial volume of 100 liters. Heat is then added and the
fluid expands at constant pressure until it reaches a saturated
vapor state.
a) Draw a diagram representing the process showing the initial
and final states of the system.
b) Sketch this process on a P-v diagram with respect to the
saturation lines, critical...
A piston?cylinder device initially contains 1.5?kg saturated
liquid water at 120°C. Now heat is transferred to the water until
the volume increases 100 times.
Determine:
a. Initial Volume of the water.
b. Final volume of water.
c. Final state of water.
d. Amount of heat added to the water
e. Draw the T?s diagram
A mass of 3 kg of saturated liquid-vapor mixture of water is
contained in a piston-cylinder device at 175 kPa. Initially, 2 kg
of the water is in the liquid phase and the rest is in the vapor
phase. An electrical heater is in operation, and the piston rises
until it hits a set of stops, which are set at double the initial
volume. Electrical heating continues until the pressure reaches 500
kPa. Determine (a) the initial and final temperatures,...
A mass of 3 kg of saturated liquid-vapor mixture of water is
contained in a piston-cylinder device at 175 kPa. Initially, 2 kg
of the water is in the liquid phase and the rest is in the vapor
phase. An electrical heater is in operation, and the piston rises
until it hits a set of stops, which are set at double the initial
volume. Electrical heating continues until the pressure reaches 500
kPa. Determine (a) the initial and final temperatures,...
A rigid tank contains a saturated liquid-vapour mixture of water
in an equilibrium state. The volume of the tank is 110 m3 and the
temperature of the water in the tank is 115°C. In the tank, 70% of
the mass is liquid and 30% of the mass is vapour. Please calculate
the total mass of water in the tank.
A manufacturing facility requires saturated steam at 120°C at a
rate of 1.2 kg/min. Design an electric steam boiler for this
purpose under these constraints: • The boiler will be in
cylindrical shape with a height-to diameter ratio of 1.5. The
boiler can be horizontal or vertical. • A commercially available
plug-in type electrical heating element made of mechanically
polished stainless steel will be used. The diameter of the heater
can be between 0.5 cm and 3 cm. Also, the...