The document outlines 13 practical experiments involving refrigeration systems and their components. The experiments include studying the vapor compression, thermoelectric, and evaporative refrigeration cycles; dismantling and identifying the major parts of open reciprocating, rotary, and scroll compressors; dismantling and reassembling thermostatic and automatic expansion valves; identifying refrigerants using pressure-temperature measurements; transferring refrigerant between storage and service cylinders; recovering refrigerants from systems using passive and active methods; and building a refrigeration cycle with auxiliaries. The goal is to familiarize students with the operation and components of different refrigeration systems through hands-on experiments.
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control Valves, Quick Exhaust Valves, Pneumatic actuators, Design of Pneumatic circuit – Cascade method – Electro Pneumatic System – Elements – Ladder diagram – Problems,
Introduction to fluidics and pneumatic logic
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Digital Tools and AI for Teaching Learning and Research
cycle and components practical.docx
1. PRACTICAL:
1. Study the vapor compression refrigeration cycle:
a) Identify the components of refrigeration cycle.
b) Start the refrigeration cycle.
c) Measure suction & discharge pressure
d) Observe temperature on discharge line, condenser, liquid line, suction line &
evaporator.
e) Observe the effect of refrigeration cycle.
2. Study the thermo‐electric refrigeration system:
a) Observe the position of heating& cooling side of the thermoelectric system.
b) Start the system.
c) Measure ampere of the cycle.
d) Observe the temperature on cooling & heating element.
3. Study the evaporative refrigeration system:
a) Identify the components of evaporative refrigeration cycle.
b) Check the voltage & ampere rating of the unit.
c) Start the unit.
d) Measure room temperature & the grill temperature of the unit.
e) Check the performance of the unit.
4. Dismantle and identify all the major working parts of an open type reciprocating
compressor:
a) Identify the external parts of the open type compressor.
b) Mark on the compressor head, valve plate & compressor body.
c) Dismantle the compressor.
d) Identify the internal parts of the compressor.
e) Observe the operation of the compressor.
f) Assemble the compressor parts.
5. Dismantle and identify all the major working parts of a rotary compressor:
a) Identify the external parts of the rotary type compressor.
b) Dismantle the compressor
c) Identify the internal parts of the compressor.
d) Observe the operation of the compressor.
e) Assemble the compressor parts.
6. Dismantle and identify all the major working parts of a scroll compressor:
a) Identify the external parts of the scroll compressor
2. b) Dismantle the compressor.
c) Identify the internal parts of the compressor.
d) Observe the operation of the compressor.
e) Assemble the compressor parts.
7. Dismantle and reassemble a thermostatic expansion valve and identify internal
parts:
a) Identify the external parts of the thermostatic expansion valve.
b) Dismantle the thermostatic expansion valve
c) Identify the internal parts
d) Reassemble the TEV.
8. Dismantle and reassemble an automatic expansion valve and identify internal
parts:
a) Identify the external parts of the automatic expansion valve.
b) Dismantle the automatic expansion valve.
c) Identify the internal parts.
d) Reassemble the expansion valve.
9. Identify the different refrigerants used in present situation by pressure
temperature method.
a) Mark 1,2 &3 on three different refrigerant cylinders.
b) Measure room temperature.
c) Measure the pressure of refrigerant cylinder 1,2 & 3.
e) Compare temperature pressure with the refrigerant temperature- pressure chart.
f) Decide the name of the refrigerant of cylinder 1,2 & 3 .
10. Transfer refrigerant from storage cylinder to service cylinder:
a) Evacuate service cylinder
b) Measure weight of the service cylinder
c) Connect hose between storage & service cylinder.
d) Cool the service cylinder
e) Purge connected hose
f) Open the cylinder valve
g) Observe weight of the service cylinder for required amount of refrigerant.
h) Close the storage cylinder valve & service cylinder valve.
11. Recover CFC-12, HCFC-22 and HFC-134a from refrigeration system by
passive method:
a) Cool the recovery cylinder by ice and water.
b) Observe the pressure of the refrigerant of the refrigerating unit to be recovered.
c) Connect charging hose with the recovery cylinder and the refrigerating unit to be
recovered.
d) Cool the recovery cylinder & set on a weighing scale.
e) Open the valve of the refrigerating unit & purge the charging hose.
3. f) Open the cylinder valve
g) Observe the pressure & close the valve till the pressure stands.
h) Observe the weight & close the valves.
12. Recover CFC-12, HCFC-22 and HFC-134a from refrigeration system using
active method:
a) Observe the pressure of the refrigerant of the refrigerating unit to be recovered.
c) Connect charging hose with the recovery machine, recovery cylinder and the
refrigerating unit to be recovered.
d) Purge the connected hoses.
e) Open the cylinder valve & the refrigerating unit valve.
f) Start the recovery machine.
g) Observe the suction pressure & close the cylinder valve until the pressure at
zero.
h) Stop the recovery machine.
13. Build up a refrigeration cycle with auxiliaries:
a) Plan draw a refrigeration cycle.
b) Put at least five auxiliaries in the drawing.
c) Select all appropriate auxiliaries.
d) Install compressor, condenser, expansion device and evaporator with all
auxiliaries.
e) Perform leak test & evacuation,
f) Charge refrigerant for perfect cooling.
