Republic of the Philippines
Camarines Sur Polytechnic College
Nabua, Camarines Sur
PRINCIPLES OF REFRIGERATION
JOB REPORT
IN
PRINCIPLES OF REFRIGERATION
Name: _________________________________
Course: ME – 3
Job Number: 3
Description: THE BASIC REFRIGERATION CYCLE
Date Started:________________________ Date Finished:______________________
Grade:
Remarks: _________________________
Instructor: ENGR. SAUL J. EBONITE, PME
I – Learning Objectives
At the end of this activity you are expected to:
1. Identify the basic components of Refrigeration system;
2. Learn the basic processes occurring in each of these parts and understand the
principles behind the cooling process;
3. Visualize the system in the form of a schematic diagram and;
4. Identify which parts of the system have the high and low pressure and
temperature during normal operation.
II – Overview
One of the most important skills a refrigeration and air conditioning technician should
have is a skill on working soft copper tubings.
The four basic components of a refrigeration system e,I, the compressor, condenser,
expansion device and the evaporator obviously are connected by copper tubes. It serves as line
where the refrigerant, the cooling medium, flows to arrive at these four basic components.
In this job, you are to perform actual practice on how to work soft copper tubings. This
will enable you to learn technique of how to cut, flare, swage, bend and braze soft copper tubes
by making an actual project designed and as shown in Part V (Working Drawings and Sketches)
in this job report.
III – Learning Aids
1. Refrigerator Trainer Set
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IV – Procedures
1. Have yourself familiarized with the different parts and attachment of the trainer.
2. Be sure that the power main switch is set to off at horizontal position.
3. Plug in the trainer’s power cord.
4. Swing in the main switch lever to NORMAL operation. All pressure gages should read
about 100 psi. If the readings are not equal, wait about 15 minutes for the low and
high-pressure sides to equal.
5. Push ON the green button of the magnetic contractor switch. The red light indicator
must list and the compressor motor must be running.
6. Take note of the pressure and thermometer gages reading after 30 minutes of
operation.
V – Sketch/ Working Drawing
1. The Refrigeration Trainer
2. Schematic Diagram of a Refrigeration Cycle
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VI – Practical Questions
1. What is Refrigeration?
2. Define Refrigerant.
3. What processes makes the refrigeration system produce cold temperature in the
evaporator?
4. What is the purpose of the accumulator?
5. What part of the system makes the cooling medium circulates?
6. Why is it the condenser usually painted black?
7. Why does the suction and discharge pressure gages equalize during the off cycle of
the system?
8. What do you think will happen if liquid refrigerant enters the suction side of the
compressor?
9. What is the purpose of soldering the capillary tube to the suction line of a domestic
refrigeration system?
10. What is the purpose of the filter/dryer?
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