Cars And Air Conditioners

We are so used to the concept of an air conditioner that we hardly take notice of it. That is only until it stops working. And then we have a serious issue at hand and at times we are clueless as to what exactly the problem is and how to tackle it.

The air conditioners have become so integral to our lives that we cannot think of living without it. First it came to our offices and factories. Then we brought them to our homes. And now we have them even in our cars. Come to think of it, it is actually essential to have an air conditioner in your car. Of course the interiors of a car is more affected by the heat of the sun than the interiors of your house or office are. And there would be additional heat from the engine to deal with. So it is quite necessary to have a car air conditioned. And it is equally important to see to it that you take proper care of the unit so that it delivers when you need it to and doesn?t break down.

It has been seen these days that to repair older air conditioners it is costing one a few hundred bucks more than it used to. This is primarily because of the regulations that have brought about a change in the refrigerants being used. The previously used R-12 refrigerant, popularly known as Freon has been replaced by R-134a. This is considered to be environmentally safer.

Since you cannot mix the two kinds of refrigerants, so any repair now would mean that you have to flush out the existing refrigerant and fill it up with the newer approved refrigerant. This will obviously increase the costs of fixing your car air conditioner.

The best way to avoid costly repairs would be to check the auto air conditioning system once every year. There are many automotive service station which would provide special check-ups before the summer seasons. You can also go for a bundle check-up where your entire car, including the air conditioner is fine tuned. This would also cut down your maintenance costs.

Since having an air conditioner in your car is a sizeable investment it would be prudent to have it functioning properly. If that would mean regular check-ups then so be it. And it is only once a year. So it shouldn?t be too much of a problem.

Jason Uvios writes on "Cars and Air Conditioners" to visit it:- air conditioner reviews, window air conditioner and air conditioners for sale

Mechanical Air Conditioners - Part I - Operating Principle

Mechanical air conditioners form the largest population of AC in this world. This article will go through the simple operating principles of this AC type. Additionally, we'll also go through other AC types used in commercial world. Namely, these are gas absorption, steam based, and thermoelectric units.

Common ACs, that we see almost everywhere on this globe, is actually, the mechanical type of AC unit. If we were to be very meticulous in the naming structure, we would have called it Mechanical ACs.

However, we just name it as air conditioner, or ACs, and everyone understands it.

One should not confuse the term between, air conditioning, and AC. Air conditioning means altering temperature, humidity, air filtration, movement and mixing. Whilst ACs are the equipment used to alter the temperature and humidity - in one package.

There are four types of ACs available for us. The,

• gas absorption AC,

• steam based AC,

• thermoelectric AC, and

• the mechanical AC

The first three AC types are mainly (if not totally) used in industrial applications. We'll go through the air conditioner operation, briefly, before concentrating on mechanical air conditioners.

Gas absorption AC

Uses, water as its refrigerant. The system uses the principle of vacuum, to encourage boiling of water at very low temperature. The water will be passed through cooling coil, for producing cool air.

Lithium bromide will be used as the absorption (or recovery) medium, once the water has passed through the cooling coil.

Steam based ACs

Is similar to gas absorption units, but it uses the brute power of steam, and venturi, to reduce the pressure of water (which is the refrigerant).

Water at low pressure will boil at low temperature, and becomes a refrigerant.

Thermoelectric AC

This AC uses the principle of thermocouple to attain heating and cooling effects at the same time. The beauty of this system lies in its simplicity of construction.

It uses electrical power, and thermocouple. As the electricity flows through the circuit, you'll get a hot region, and a cold region. Talk about killing two birds with one stone.

However, the major limitation of this concept is that, it can only produce a small cooling or heating effect, compared to other air conditioners.

Mechanical Air Conditioners

It is named mechanical, as it requires the continuous act of refrigerant compression for cooling, or heating effect. This concept was thought by Willis Haviland Carrier, when he created the first mechanical air conditioner.

Special refrigerant are used in order to achieve this. These are known as CFCs (already banned), HCFCs and, HFCs. Why use these? Because of very low boiling temperatures, at ambient pressure.

Details of this air conditioner operation,

• a compression process is required to raise the pressure of refrigerant. When this happens, you can liquefy the refrigerant (through condensation) easily,

• this is followed by refrigerant condensation. Condensation happens through heat exchange between refrigerant, and air (or water),

• an expansion device (or valve) will be placed after the condenser. This is a device to allow for pressure build up from compressor. This is also, the place where refrigerant will evaporate into low pressure region.

  When this happens refrigerant will start to boil at very low temperatures,

• finally, the refrigerant will be passed through another heat exchanger - to complete the boiling process. Heat exchange happens between air and refrigerant

• this process repeats at the compression side

Those are the processes involved in achieving cool air, through mechanical air conditioners - through continuous "supply" of refrigerant at low temperatures.

Part II is coming soon...

TS Mohamed Rasied,
Provides information on air conditioners and air conditioning in her site,
http://www.air-conditioner-selection.com/
 

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HVAC Schools

If you are mechanically inclined and looking for a new career, perhaps HVAC School is something you should look into. HVAC Schools teach skills and technology for installation and repair of heating, ventilation, air conditioning, and refrigeration (HVAC/R) systems. Students learn to troubleshoot the electronic and mechanical components of HVAC units.

HVAC Schools offer numerous options to earn diplomas, certificates, and Associate of Applied Science (AAS) degrees. Diploma and certificate programs can be completed in a year or 18 months; AAS degree programs can be completed in two years and involve more in-depth study of management and business applications.

Training will include commercial heating, refrigeration and air conditioning, wiring techniques, service call procedures, and troubleshooting training programs and courses. Graduates of HVAC Schools are prepared for positions working with heating, refrigeration, and air conditioning systems as entry-level technicians, mechanics, and service sales persons.

Some HVAC Schools offer two-year Associate of Applied Science degree programs in service management. Students in AAS service management degree program will concentrate on business operations - accounting, business law, salesmanship, and management - and aspects of customer service. AAS service management graduates are prepared for positions as repair technicians, apprentice mechanics, supervisors, and managers at the entry-level.

HVAC technicians may work in various types of businesses and manufacturing, for private contractors, or in institutional buildings. There is a steady demand for skilled HVAC technicians. Even though the work can be strenuous at times, the rewards can be worth it, with most technicians bringing home respectible salaries.

If you are interested in the field of heating, ventilation, air conditioning, and refrigeration, apply to a HVAC School or Online HVAC School today!

DISCLAIMER: Above is a GENERAL OVERVIEW and may or may not reflect specific practices, courses and/or services associated with ANY ONE particular school(s) that is or is not advertised on SchoolsGalore.com.

Michael Bustamante, in association with Media Positive Communications, Inc. for SchoolsGalore.com

Michael Bustamante is a staff writer for Media Positive Communications, Inc. in association with SchoolsGalore.com. Visit our Traditional School Directory and find Schools, Colleges, Universities, Vocational Schools and Online Schools at SchoolsGalore.com, your educational resource to locate schools.