Question
In: Mechanical Engineering
Refrigerant 134a at p1 = 30 lbf/in2, T1 = 40oF enters a compressor operating at steady...
Refrigerant 134a at p1 = 30
lbf/in2, T1 =
40oF enters a compressor operating at steady state with
a mass flow rate of 400 lb/h and exits as saturated vapor at
p2 = 160 lbf/in2. Heat
transfer occurs from the compressor to its surroundings, which are
at T0 = 40oF. Changes in kinetic and
potential energy can be ignored. The power input to the compressor
is 4 hp.
Determine the heat transfer rate for the compressor, in Btu/hr, and
the entropy production rate for the compressor, in
Btu/hr·oR.
Solutions
samet mamat answered 2 years agoRelated Solutions
Air enters the compressor of a simple gas turbine at p1 = 14 lbf/in2, T1 =...
Air enters the compressor of a simple gas turbine at
p1 = 14 lbf/in2, T1 = 520°R. The
isentropic efficiencies of the compressor and turbine are 83 and
87%, respectively. The compressor pressure ratio is 16 and the
temperature at the turbine inlet is 2500°R. The volumetric flow
rate of the air entering the compressor is 9000 ft3/min.
Use an air-standard analysis.
Determine all temperatures at each state.
A) Determine the net power developed, in Btu/h.
B) Determine the thermal...
Air enters the compressor of a simple gas turbine at p1 = 14 lbf/in2, T1 =...
Air enters the compressor of a simple gas turbine at p1 = 14
lbf/in2, T1 = 520°R. The isentropic efficiencies of the compressor
and turbine are 83 and 87%, respectively. The compressor pressure
ratio is 16 and the temperature at the turbine inlet is 2500°R. The
volumetric flow rate of the air entering the compressor is 9000
ft3/min. Use an air-standard analysis.
Determine the net power developed, in Btu/h.
Air enters the compressor of a simple gas turbine at p1 = 14 lbf/in2, T1 =...
Air enters the compressor of a simple gas turbine at p1 = 14
lbf/in2, T1 = 520°R. The isentropic efficiencies of the compressor
and turbine are 83 and 87%, respectively. The compressor pressure
ratio is 16 and the temperature at the turbine inlet is 2500°R. The
volumetric flow rate of the air entering the compressor is 9000
ft3/min. Use an air-standard analysis.
Determine the net power developed, in Btu/h.
Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -26oC with...
Refrigerant 134a enters an insulated compressor operating at
steady state as saturated vapor at -26oC with a
volumetric flow rate of 0.18 m3/s. Refrigerant exits at
8 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.
Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -20oC with...
Refrigerant 134a enters an insulated compressor operating at
steady state as saturated vapor at -20oC 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.
Refrigerant 134a enters an air conditioner compressor at 4 bar, 20°C, and is compressed at steady...
Refrigerant 134a enters an air conditioner compressor at 4 bar,
20°C, and is compressed at steady state to 12 bar, 80°C. The
volumetric flow rate of the refrigerant entering is 7.5 m3/min. The
work input to the compressor is 112.5 kJ per kg of refrigerant
flowing. Neglecting kinetic and potential energy effects, determine
the magnitude of the heat transfer rate from the compressor, in
kW.
Refrigerant 134a enters the evaporator of a refrigeration system operating at steady state at -4oC and...
Refrigerant 134a enters the evaporator of a refrigeration system
operating at steady state at -4oC and a quality of 20% at a
velocity of 6 m/s. At the exit, the refrigerant is a saturated
vapor at -4oC. The evaporator flow channel has constant diameter of
1.7 cm. Determine the mass flow rate of the refrigerant, in kg/s,
and the velocity at the exit, in m/s.
Air enters a compressor operating at steady state with a pressure of 14.7 lbf/in.2, a temperature...
Air enters a compressor operating at steady state with a
pressure of 14.7 lbf/in.2, a temperature of 70°F, and a volumetric
flow rate of 500 ft3/min. The air velocity in the exit pipe is 700
ft/s and the exit pressure is 133 lbf/in.2 If each unit mass of air
passing from inlet to exit undergoes a process described by pv1.34
= constant, determine (a) the exit temperature, in °F, and (b) the
diameter of the exit pipe, in inches.
refrigerant 134a enters the evaporator of a refrigeration system operating at steady state at -12°C and...
refrigerant 134a enters the evaporator of a
refrigeration system operating at steady state at -12°C and a
quality of 20% at a velocity of 7 m/s. At the exit, the refrigerant
is a saturated vapor at -12°C. The evaporator flow channel has
constant diameter of 1.7cm.
Determine the mass flow rate of the refrigerant in
kg/s
Determine the velocity at the exit in m/s
Refrigerant 134a enters a horizontal pipe operating at steady state at 40°C, 300 kPa, and a...
Refrigerant 134a enters a horizontal pipe operating at steady
state at 40°C, 300 kPa, and a velocity of 25 m/s. At the exit, the
temperature is 70°C and the pressure is 240 kPa. The pipe diameter
is 0.01 m. Determine: (a) the mass flow rate of the refrigerant, in
kg/s, (b) the velocity at the exit, in m/s, and (c) the rate of
heat transfer between the pipe and its surroundings, in kW.
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