ENTC-370 PROF. ALVARADO 1

THERMODYNAMICS LAB:EES- Refrigeration Cycle & Internal Combustion Engine

ENTC - 370

ENTC-370 PROF. ALVARADO 2

Ideal Refrigeration Cycle

ENTC-370 PROF. ALVARADO 3

Evaporator, Throttle Valve, Condenser

in out

4 in 1

in 1 4

For Evaporator:

E E

m h +Q =m h

Q m (h h )

43

43

outin

h h

h mh m

EE

:ValveExpansion For

)h(h mQ

h mQh m

EE

:CondenserFor

32out

3out2

outin

)h(h mW

h mh mW

EE

:CompressorFor

12

21

outin

4

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.

Internal Combustion Engine

ENTC-370 PROF. ALVARADO 5

Ideal Cycle for Gasoline Engine (Otto Cycle)

ENTC-370 PROF. ALVARADO 6