air cond compressor lab report

Topics: Air conditioning, Air conditioner, HVAC Pages: 7 (1873 words) Published: February 16, 2014
1.0 Learning outcome

Upon completion of this course, student should be able to
1.1 Explain safety procedures according to the workshop safety regulation. 1.2 Perform maintenance of aircond compressor.

2.0 Tools/ Equipment

3.0 Safety Equipment

3.1 Face shield/ Google
3.2 Apron / Jacket
3.3 Gloves
3.4 Safety Boot

4.0 Rules And Regulation In Workshop
1. Always listen carefully to the teacher and follow instructions. 2. Do not run in the workshop, you could ‘bump’ into another pupil and cause an accident. 3. Know where the emergency stop buttons are positioned in the workshop. If you see an accident at the other side of the workshop you can use the emergency stop button to turn off all electrical power to machines. 4. Always wear an apron as it will protect your clothes and hold loose clothing such as ties in place. 5. Wear good strong shoes. training shoes are not suitable.

6. When attempting practical work all stools should be put away. 7. Bags should not be brought into a workshop as people can trip over them. 8. When learning how to use a machine, listen very carefully to all the instructions given by the teacher. Ask questions, especially if you do not fully understand. 9. Do not use a machine if you have not been shown how to operate it safely by the teacher. 10. Always be patient, never rush in the workshop.

11. Always use a guard when working on a machine.
12. Keep hands away from moving/rotating machinery.
13. Use hand tools carefully, keeping both hands behind the cutting edge. 14. Report any damage to machines/equipment as this could cause an accident.

5.0 Theory

Today almost all cars, including small family hatch backs come with air conditioning as standard. Yet, the majority of us hardly have an understanding, or even care how it works... That is until the first hot day of the summer comes around and we find ourselves starring under the bonnet in a bewilderment wondering why it is not working and the car is no longer a cool place to be. Just may be, if we had an understanding or had given some thought to what goes on amongst all the other oily bits, which we take care to have serviced at regular intervals we could possibly have avoided the now unfamiliar experience of being hot and uncomfortable in a car on the drive home.  

Basic Working Principles of a Vehicle Air Conditioning System What we will attempt is to describe, in layman's terms is how the air condition system on a vehicle works and what happens when we press the "A/C" button on the vehicles dashboard. You know that Starry Patterned one! The basic working principle of all cooling systems, be it the domestic freezer, the Air Conditioning system in our office or the one fitted to our vehicle is the same. The fundamental processes at work are four basic principles in physics, which we all have probably experienced in everyday life Compression, Expansion, Evaporation and Condensation.  

 
Compression
When you pump up a bicycle tyre, the body of the pump where the air is compressed above the pressure inside the tyre, causing the transfer of air into the tyre gets hot. As the tyre inflates and more effort is needed to compress the air to an ever higher pressure the pump gets even hotter. The tyre also becomes heated by the now hot gases entering through the valve.  

Expansion
When you discharge an aerosol can the body of the can gets cooler because of the reduced pressure inside the can as the liquid contents are expelled turning to gas.  
Evaporation
The old sailors trick to find the wind direction by wetting a finger and feeling which side is chilled by the passing flow of air.  
Condensation
Whenever warm wet air touches a cold surface such as the outside surface of a glass of ice cold beer heat is from the air and transferred to the cold surface reducing its temperature turning the water vapour back to liquid droplets of water.  

The air conditioning system in our...
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