Question

Superheated steam at 5MPa and 400^{0C} flows at a rate
of 3kg/s through a well insulated horizontal nozzle operating at
steady state. The inlet steam enters the nozzle at velocity of
20m/s and exits at 500m/s at 100kPa.

Determine:

A) Whether steam entering the nozzle is considered an ideal gas? Find the specific enthalpy and specific volume at entrance of nozzle?

B) Find the exit temperature in K? What is the phase of the steam exiting the nozzle? Determine the exiting temperature, specific volume, and specific enthalpy?

Answer #1

Refrigerant 134a enters a well-insulated nozzle at 14 bar, 60°C,
with a velocity of 37 m/s and exits at 1.2 bar with a velocity of
460 m/s. For steady-state operation, and neglecting potential
energy effects, determine the exit temperature, in °C.

Steam enters a nozzle operating at a pressure of 30 [bar] and a
temperature of 320 [◦C] with negligible velocity. The steam exits
the nozzle at a pressure of 15 [bar] and a velocity of 10 [m/s].
The mass flow rate is 2.5 [kg/s]. Assume the nozzle is well
insulated.
Determine the exit temperature of the steam.

Steam at 6 MPA, 600°C, enters a well-insulated turbine operating
at steady state and exits at 0.1 bar. The isentropic efficiency of
the turbine is 94.7%. Assuming the kinetic and potential energy
effects to be negligible, determine:
(a) Work output, in kJ/kg,
(b) The temperature at the exit of the turbine, in °C, and
(c) The rate of entropy production within the turbine, in kJ/K
per kg of steam flowing through the turbine.
(All steps required – Given/Find/Schematic/Engineering
Model/Analysis)
THANK...

1) A nozzle is a device for increasing the velocity of a
steadily flowing stream of fluid. At the inlet to a certain nozzle
the enthalpy of the fluid is 3025 kJ/kg and the velocity is 60 m/s.
At the exit from the nozzle the enthalpy is 2790 kJ/kg. The nozzle
is horizontal and there is negligible heat loss from
it.
(i) Find the velocity at the nozzle exit.
(ii) If the inlet area is 0.1 m2 and specific volume...

a tube-within-a-tube heat
exchanger operating at steady state is composed of one pipe
containing
Refrigerant 134a and another pipe containing an ideal gas with
constant specific heat at constant
pressure of 1.2 kJ/(kg∙K). The refrigerant 134a enters the heat
exchanger in a saturated liquid state
and exits the heat exchanger in a saturated vapor state. The
temperature and mass flow rate of the
refrigerant 134a are -20° C and 3 kgs/s, respectively, at both its
inlet and outlet. The ideal...

A horizontal portion of a well-insulated ducting for a
ventilation system operating at steady state has one inlet at 35
degrees C with a mass flowrate of 45 kg/min and a second inlet at
21 degrees C with a volumetric flowrate of 30.25 m^3/min. A single
stream exits at 29 degrees C through a 1.1 m diameter pipe. The
pressure for the entire system is 1 atm throughout. Assume air as
an ideal.
a.) Draw a detailed schematic of the...

13) A turbine, operating under steady-flow
conditions, receives 5000 kg of steam per hour. The steam enters
the turbine at a velocity of 3000 m/min, an elevation of 5 m and a
specific enthalpy of 2787 kJ/kg. It leaves the turbine at a
velocity of 6000 m/min, an elevation of 1 m and a specific enthalpy
of 2259 kJ/kg. Heat losses from the turbine to the surroundings
amount to 16736 kJ/h. Determine the power output of the
turbine.
14) 12 kg...

A steam of 100mol/s ethanol(C2H5OH) vapor
at 400oC and 1 atm is fed to an adiabatic reator. The
ethanol is reacted to produce acetaldehyde (CH3CHO)
vapor and hydrogen (H2) gas.After a conversion of 30%
the products exit from the reactor at 1atm.It is given that the
heat capacity of acetaldehyde,in kJ/(mol.oC) is given as
below:
Cp,CH3CHO=50.48X10-3+13.26x10-5T-8.049x10-8T2+23.8X10-12T3
i)Express the molar flowrate and specific enthalpy for all
substances in the inlet-outlet enthalpy table.
ii)Show the stoichiometric equation for the reaction in the...

Steam enters a horizontal 14-cm-diameter pipe as a saturated
vapor at 5 bar with a velocity of 10 m/s and exits at 4.5 bar with
a quality of 95%. Heat transfer from the pipe to the surroundings
at 291K takes place at an average outer surface temperature of 400
K. For operation at steady state, determine
(a) the velocity at the exit, in m/s.
(b) the rate of heat transfer from the pipe, in
kW.?
(c) the rate of entropy...

Steam enters a horizontal 14-cm-diameter pipe as a saturated
vapor at 5 bar with a velocity of 10 m/s and exits at 4.5 bar with
a quality of 95%. Heat transfer from the pipe to the surroundings
at 291K takes place at an average outer surface temperature of 400
K. For operation at steady state, determine
(a) the velocity at the exit, in m/s.
(b) the rate of heat transfer from the pipe, in
kW.?
(c) the rate of entropy...

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