Automotive Engineering Centre, UET Lahore
Vehicle Air Conditioning Laboratory
Name: _________________________ Reg. No.: ________________ Date: ______________
EXPERIMENT NO. 1:
DEMONSTRATION OF THE VAPOR COMPRESSION REFRIGERATION CYCLE AND
PRODUCTION OF THE CYCLE DIAGRAM UNDER VARIOUS CONDITIONS.
APPARATUS: As per figure attached
PROCEDURE: Switch on the Refrigeration Laboratory Unit apparatus after taking care of all the
necessary precautions. Allow running of the apparatus for a while so that the readings shown
become stable. Change the evaporator input by the knob provided for each set of readings. To keep
condenser pressure constant, change water flow rate accordingly. Insert the values in the table of
observations.
TABLE/OBSERVATIONS:
Sr
No.
Evaporator Condenser
Pressure* Pressure*
(kNm-2)
(kNm-2)
Pevp
1
2
3
4
*Absolute Pressure
Pcon
Water
flowrate
g/s
Compressor Condenser
Suction
delivery
Temp. (oC)
Temp.
(oC)
mw
T1
T2
Exp.
Valve
Inlet
Temp.
(oC)
T3
Evaporator
Inlet
Temp.
(oC)
T4
SPECIMEN CALCULATION: (For first set of readings)
Draw the state points on p-h diagram as follows:
1.
2.
3.
4.
Is located by the intersection of Pevp=
and T1=
Is located by the intersection of Pcon=
and T2=
Is located by the intersection of Pcon=
and T3=
Is located by dropping a vertical line (assumed adiabatic) from point 3 to the intersection
with Pcon line.
Automotive Engineering Centre, UET Lahore
Vehicle Air Conditioning Laboratory
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