Question

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.

Answer #2

answered by: anonymous

Refrigerant 134a enters an insulated compressor operating at
steady state as saturated vapor at -12oC with a
volumetric flow rate of 0.18 m3/s. Refrigerant exits at
9 bar, 70oC. Changes in kinetic and potential energy
from inlet to exit can be ignored.
Determine the volumetric flow rate at the exit, in m3/s,
and the compressor power, in kW.

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.

A saturated vapor of refrigerant 134a at 1000 kPa enters a
nozzle with a negligible velocity. It leaves the nozzle at 500 kPa.
What is the maximum velocity it could have, in m/s?
Hint: Remember that a nozzle does an energy
conversion. The maximum velocity occurs when this is being done
with the highest possible efficiency. What did you learn about
entropy when efficiency is at a maximum?

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...

Refrigerant-134a enters a diffuser steadily as saturated vapour at
600 kPa with a velocity of 160 m/s, and it leaves at 700 kPa and
40°C. The refrigerant is gaining heat at a rate of 2 kJ/s as it
passes through the diffuser : determine
(a- the exit velocity
(b- the mass flow rate of the refrigerant.
If the exit area is twice the inlet area (A2=2A1),

Superheated steam at 5MPa and 4000C 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...

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...

Steam enters a converging-diverging nozzle at steady state with
P1 = 40bar T1 = 400°C and a velocity of
12m/s. The steam flows through the nozzle with negligible heat
transfer and no significant change in potential energy. At the exit
P2 = 15bar and the velocity is 700 m/s. The mass flow
rate is 2.5 kg/s. Determine the exit area of the nozzle in
m2

Refrigerant 134a enters a tube at a rate of 0.07 kg/s as
saturated liquid at 70 C and leaves the tube as saturated liquid as
well at -8 C. It loses 10 kW of heat to the surroundings in the
process. If the surroundings are at a temperature 10 C, find the
total entropy generation in this process. Assume steady
conditions

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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