Transcript THERMODYNAMICS LAB: Introduction to EES

THERMODYNAMICS LAB:
EES- Refrigeration Cycle &
Internal Combustion Engine
ENTC - 370
ENTC-370
PROF. ALVARADO
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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
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3
in
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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
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Ideal Cycle for Gasoline Engine
(Otto Cycle)
ENTC-370
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