03-01-2013, 10:48 AM
PERFORMANCE TEST ON VAPOUR COMPRESSION REFRIGERATION SYSTEM
AIM:
To determine the characteristics of Vapour Compression Refrigeration system and to find out
Theoretical COP
Ton of Refrigeration
Actual COP
Relative COP
Efficiency of the cycle
Plot the following performance characteristics
Theoretical COP Vs Chiller Temperature T5
Actual COP Vs Chiller Temperature T5
Relative COP Vs Chiller Temperature T5
EXPERIMENTAL PROCEDURE:
a. Switch –ON the Mains and Console (MCB)
b. Switch - ON the motor which drives the compressor and the fan
c. The refrigerant passes through the vapour compression cycle as mentioned earlier resulting in cooling in the evaporator chamber or freezer.
d. Wait for about few minutes and after stabilization note the Temperatures T1 to T5 and Pressures P1 and P2
OPERATION PROCEDURE:
1. Switch on the by regulating the ‘thermostat’. Also observe ‘compressor ON’ indicator.
2. Select the experiment type like expansion valve or Capillary by following procedure.
A. For capillary, open valves V5 & V6 and close V1, V4
B. For expansion valve, open V4 and switch on the ‘SV ON’. Also see the indicator ‘SVON’ glows. Close the valves V1, V5 & V6
C. To read Rota meter reading.
3. Take the wattmeter reading, Temperature reading, pressures & Rotta meter reading.
4. Using formulae calculate the COP.
5. Switch of the compressor by regulating the ‘thermostat’.
6. Repeat the experiment with the other valve (i.e. capillary or expansion).
7. One experiment is over close all the valves i.e. V1, V2, V3, V4 & V5.
DESCRIPTION:
In any Compression refrigeration system, there are two different pressure regions low pressure (LP) & high pressure HP. Two analog pressure gauges are provided to measure this two pressure readings. Digital temperature indicators with selector switch provider to measure temperature of the refrigerant at five regions that are compressor inlet T1, condenser inlet T2, Expansion valve or throttle valve. Inlet T3, Evaporator Inlet T4 and Chiller inside T5. Digital power meter is used to measure power input to the Compressor.