Refrigerant 134a enters through a horizontal pipe at 3.2 bar and 40oC with a velocity of 40 m/s. At the exit, the temper

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Refrigerant 134a enters through a horizontal pipe at 3.2 bar and
40oC with a velocity of 40 m/s. At the exit, the
temperature is 50oC and pressure of 240 kPa. If the pipe
diameter is 0.04m,
Determine the mass flow rate of the substance in
kg/s
A reversible power cycle whose thermal efficiency is 32 %
receives 49.7 kJ by heat transfer from a hot reservoir at 572 K and
rejects energy by heat transfer to a cold reservoir at temperature
TC.

Determine Tc in K
A gas within a piston–cylinder assembly undergoes a
thermodynamic cycle consisting of three processes in series,
beginning at state 1 where p1 = 1 bar,
V1 = 1.5 m3, as follows:

Process 1–2: Compression with pV = constant, W12 =
-104 kJ, U1 = 512 kJ, U2 = 690
kJ.
Process 2–3: W23 = 0, Q23 = -150
kJ.
Process 3–1: W31 = 50 kJ.

There are no changes in kinetic or potential energy.
Determine U3 in kJ
Water is flowing through a 30-m-long and 5-cm-diameter
horizontal pipe at a rate of 9 L/s. Using density = 1000
kg/m3 and viscosity = 1.138 x
10-3 kg/m-s
Determine the average velocity of the water.
Air passes through a horizontal duct with steady state
conditions. The air enters with parameters 290 K, 1 bar, and a
volumetric flow rate of 0.25 m3/s, and exits at 325 K,
0.95 bar. The cross sectional area of the duct is constant at
0.04 m2.
Determine the velocity of the air at the inlet.
Water is flowing through a 30-m-long and 5-cm-diameter
horizontal pipe at a rate of 9 L/s. Using density = 1000
kg/m3 and viscosity = 1.138 x
10-3 kg/m-s
Determine the Reynold's number
Air passes through a horizontal duct with steady state
conditions. The air enters with parameters 290 K, 1 bar, and a
volumetric flow rate of 0.25 m3/s, and exits at 325 K,
0.95 bar. The cross sectional area of the duct is constant at
0.04 m2.
Determine the velocity, in m/s, at the outlet
Air passes through a horizontal duct with steady state
conditions. The air enters with parameters 290 K, 1 bar, and a
volumetric flow rate of 0.25 m3/s, and exits at 325 K,
0.95 bar. The cross sectional area of the duct is constant at
0.04 m2.
Determine the mass flow rate in kg/s

Use 4 decimal places
Water is flowing in a pipe of varying cross-sectional area, and
at all points the water completely fills the pipe. The
cross-sectional area at point 1 is 802 cm2 and the
velocity is 3.04 m/s.

Compute the fluid's velocity, in m/s, at point 2 where the
cross-sectional area is 581 cm2.
A sealed tank containing seawater to a height of 12m also
contains air above the water at a pressure of 5 atm (1atm = 101.325
kPa). Water flows out from the bottom through a small hole.

Determine the velocity of the water at the exit.
A hydroelectric turbine produces 50 m of head with a flow
rate of 1.30 m3/s. The overall turbine–generator
efficiency is 78 percent. What is the electric power output in kW
of this turbine?
Steam enters a 1.6-cm-diameter pipe at 80 bar and
600oC with a velocity of 150 m/s. Determine the mass
flow rate, in kg/s.

Use 4 decimal places
Air exits a turbine at 191 kPa and 143oC with a
volumetric flow rate of 6,964 liters/s. Modeling air as an ideal
gas, determine the mass flow rate, in kg/s.
Refrigerant 134a flows through a horizontal tube with an inside
diameter of 5 cm. The refrigerant enters the tube with a quality of
0.1, temperature of 36oC, and velocity of 10 m/s. The
refrigerant exits the tube at 9 bar as a saturated liquid.
Determine the rate of heat transfer, in kW
Refrigerant 134a enters through a horizontal pipe at 3.2 bar and
40oC with a velocity of 40 m/s. At the exit, the
temperature is 50oC and pressure of 240 kPa. If the pipe
diameter is 0.04m,
Determine the velocity at the exit in m/s
A reversible power cycle whose thermal efficiency is 34 %
receives 48.7 kJ by heat transfer from a hot reservoir at 590 K and
rejects energy by heat transfer to a cold reservoir at temperature
TC.

Determine the energy rejected in kJ
Refrigerant 134a enters through a horizontal pipe at 3.2 bar and
40oC with a velocity of 40 m/s. At the exit, the
temperature is 50oC and pressure of 240 kPa. If the pipe
diameter is 0.04m,
Determine the rate of heat transfer to the surroundings in
kW.
The rate of water flow is 20 L/s through a horizontal pipe with
a constant diameter of 3 cm. A pressure drop occurs because of a
valve and was measured to be 2 kPa.
Determine the pumping power required to overcome the pressure
drop in kW
A gas within a piston–cylinder assembly undergoes a
thermodynamic cycle consisting of three processes in series,
beginning at state 1 where p1 = 1 bar,
V1 = 1.5 m3, as follows:

Process 1–2: Compression with pV = constant, W12 =
-104 kJ, U1 = 512 kJ, U2 = 690
kJ.
Process 2–3: W23 = 0, Q23 = -150
kJ.
Process 3–1: W31 = 50 kJ.

There are no changes in kinetic or potential energy.
Determine Q12 in kJ
The rate of water flow is 20 L/s through a horizontal pipe with
a constant diameter of 3 cm. A pressure drop occurs because of a
valve and was measured to be 2 kPa.
Determine the head loss, in m, due to the valve.

Use 4 decimal places