# IE thermodynamics homework

Anonymous

### Question Description

I’ll upload a picture of paper that has 4 questions and need it to be solvers as soon as possible. The questions that you will see is 4.9 , 4.12, 4.15 and 4.26

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DrChelsea
School: Rice University

Attached.

Air enters a one-inlet, one-exit control volume at 6 bar, 500 K, and 30m/s through a flow of 28 cm2. At
the exit, the pressure is 3 bar, the temperature is 456.5 K, and the velocity is 300 m/s. The air behaves as
an ideal gas. For steady-state operation, determine
a) the mass flow rate in Kg/s
Given that there is one inlet and one exit, and a steady flow of gas;
Mass rate balance mµ1=mµ2=mµ
Mass flow rate mµ =Density ρ, * Volume flow rate Vµ
Volume flow rate Vµ = area A * Velocity average Vavg
Therefore;
Mass flow rate mµ =area A, * Velocity average Vavg * Density ρ
=0.0028m2 * 30 m/s * 4.1876kg/m3
=0.3518 kg/s
b) the exit flow area in cm
Area A = mass flow rate mµ
Velocity average * Density
=0.3518kg/s
300m/s*2.2912kg/m3
=0.0005 m2
=5 cm2
Refrigerant 134a enters the evaporator of a refrigeration system operating at steady state -40C and
quality of 20% at a velocity of 7 m/s. At the exit, the refrigerant is a saturated vapor at a temperature of
-40C. The evaporator flow channel has constant diameter. If the mass flow rate of the entering
refrigerant is 0.1 Kg/s, determine
a) the diameter of the evaporator flow channel, in cm
b) the velocity at the exit in m/s.
Air pressure enters a compressor operating at steady state with a pressure of 14.7 lbf/in2 and a
volumetric flow rate of 8ft3/s. The air velocity in the exit pipe is 225ft3/s and the exit pressure is
150lbf/in2. If each unit mass of air passing from inlet to exit undergoes a process described by pv1.3 =
constant, determine the diameter of the exit pipe in inches.

Air enters a horizontal, constant-diameter heating duct operating at steady state at 290 K, 1 bar, with a
volumetric flow rate of 0.25 m3/s, and exits at 325 K, 0.95 bar. The flow area 0...

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Anonymous
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Anonymous
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Anonymous
Thanks, good work

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