THERMODYNAMICS LAB: Introduction to EES
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Transcript THERMODYNAMICS LAB: Introduction to EES
THERMODYNAMICS LAB:
EES- Refrigeration Cycle &
Internal Combustion Engine
ENTC - 370
ENTC-370
PROF. ALVARADO
1
Ideal Refrigeration Cycle
ENTC-370
PROF. ALVARADO
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Evaporator, Throttle Valve,
Condenser
For Evaporator:
For ExpansionValve :
E
E
E in E out
in
out
m h 4 +Qin =m h1
h 3 m
h 4
m
Qin m (h1 h 4 )
h3 h4
For Condenser:
E
E
For Compressor:
E
E
m
h 2 Q
h 3
m
out
(h h )
Q
m
m
h1 m
h 2
W
m
(h h )
W
in
out
ENTC-370
out
2
3
in
PROF. ALVARADO
out
2
1
3
Problem 1
Refrigerant 134-a enters the compressor of a
refrigerator at 180 kPa and -5 °C at a rate of 0.4 m3/min
and is compressed isentropically to 850 kPa. The
refrigerant enters the throttling valve at 800 kPa and 30
°C and leaves the evaporator as saturated vapor at -12
°C. Note: Need to determine mass flow rate.
Determine:
•Power input to the compressor
•The rate of heat removal from the refrigerated space
•Plot the rate of heat removal against compressor power for
flow rates varying from 0.2 m3/min to 1 m3/min under inlet
pressures 100,150 and 200 Kpa.
•Using EES, plot the P-h diagram for flow rate of 0.4 m3/min.
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Internal Combustion Engine
ENTC-370
PROF. ALVARADO
5
Ideal Cycle for Gasoline Engine
(Otto Cycle)
ENTC-370
PROF. ALVARADO
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