Summer Alert :: Car AC
If you have installed a Car AC after buying a non-AC Car (say Maruti, 800, Alto, Santro, etc) be sure that while working of a tight Budget, has your AC fitment Technician short changed you for the following:
1. Has the technician modified the Car Wiring to increase the RPM as soon as the AC is switched on.
2. Has the technician changed th Radiator Fan to AC ratings (say from 80 watts to 120 watts in Maruti 800)
3. The Radiator and AC Condenser gap is sealed properly with foam.
For more details, read on : http://megapowerbosch.blogspot.in/search?q=car+ac
Here I wish to highlight that when you negotiate too much for Car AC Service or Car AC fitment with AC technicians, they tend to short change on above mentioned issues to save costs. Eventually, you are the loser as even after spending a good amount of money, Cool Car will always be a distant dream.
One more Important point:
When you approach a Car AC Technician for AC Gas filling, if the technician does not add Compress Lube Oil to the AC Gas, he will be killing your AC Compressor as the AC Lube oil moves with the AC gas to lubricate the AC Compressor and Oil leaks with the AC Gas. Running Dry AC Compressor will cause friction and failure of the compressor.
Know your Car AC:
The air-conditioning compressor does exactly what its name says -- it compresses refrigerant and sends it to your car's air condenser. The entire process is powered by your engine's drive belt (or belts). The highly pressurized liquid refrigerant converts to a gas and is circulated into tubes where the heat from the gas is quickly released, causing it to cool. The cooled gas then reverts back into liquid form as it returns to the compressor. The cooled gas is used to chill the car's cabin air .
To keep your car's compressor in shape throughout the year, it's recommended that you run the A/C compressor regularly, to keep the system working properly and to extend its longevity. Many cars use the A/C compressor for functions of heating and ventilation in the defrost cycle, too. But if your car doesn't, you should run the compressor for at least 10 minutes each month, even during the winter months.
Air and Refrigerant is manipulated by the AC system. In this the compressor takes refrigerant gas and pressurizes and compresses it thereby making it hot. After this the hog gas moves in the condensing coils where the air is blown by the fan to outer side. The heat is then dispersed where the refrigerant gas settles and cools down to liquid. Refrigerant's flow is controlled by the expansion valve which is turned to cold gas after that. The cool air is then forced to move to the receiver, where it filters the contaminants before moving to the interior of the cor. Then the hot refrigerant returns to the compressor again.
So, if you notice that your car air conditioning system isn't putting out any cold air, or minimal cold air, a dysfunctional or broken compressor could be the culprit (among several other possibilities). Just remember that compressors function at high pressures, involve liquid refrigerant and require special tools to service -- it may be best to leave changing the compressor to an experts.
Air and Refrigerant is manipulated by the AC system. In this the compressor takes refrigerant gas and pressurizes and compresses it thereby making it hot. After this the hog gas moves in the condensing coils where the air is blown by the fan to outer side. The heat is then dispersed where the refrigerant gas settles and cools down to liquid. Refrigerant's flow is controlled by the expansion valve which is turned to cold gas after that. The cool air is then forced to move to the receiver, where it filters the contaminants before moving to the interior of the cor. Then the hot refrigerant returns to the compressor again.
An AC Condenser helps in dissipating the heat. The AC condenser is placed directly behind the grille.
An AC condenser looks like a radiator. This AC condenser is just like a radiator which has tubing or coils and cooling fins inside it. The only difference between a radiator and an AC condenser is that the radiator works for the cooling system of the engine, whereas an AC condenser functions for the interior air conditioning.
If the coil of an air conditioning condenser is kept neat and clean, it will definitely function properly and that too for long time. This is one of the best ways to save your electricity and you can run the central air conditioner effectively. This will also increase the life of the compressor as the compressor will also run cooler. So remember, to clean your AC’s condenser coil once in a year. However, if you stay in some dirt and polluted areas then you have to clean the air conditioning condenser regularly.
The evaporator serves as the heat absorption component. The evaporator provides several functions. Its primary duty is to remove heat from the inside of your vehicle. A secondary benefit is dehumidification. As warmer air travels through the aluminum fins of the cooler evaporator coil, the moisture contained in the air condenses on its surface. Dust and pollen passing through stick to its wet surfaces and drain off to the outside. On humid days you may have seen this as water dripping from the bottom of your vehicle. Rest assured this is perfectly normal.
The ideal temperature of the evaporator is 32° Fahrenheit or 0° Celsius. Refrigerant enters the bottom of the evaporator as a low pressure liquid. The warm air passing through the evaporator fins causes the refrigerant to boil (refrigerants have very low boiling points). As the refrigerant begins to boil, it can absorb large amounts of heat. This heat is then carried off with the refrigerant to the outside of the vehicle. Several other components work in conjunction with the evaporator. As mentioned above, the ideal temperature for an evaporator coil is 32° F. Temperature and pressure regulating devices must be used to control its temperature. While there are many variations of devices used, their main functions are the same; keeping pressure in the evaporator low and keeping the evaporator from freezing; A frozen evaporator coil will not absorb as much heat.
HVAC (heating, ventilation, and air conditioning) refers to technology of indoor or automotive environmental comfort.
R12
R12 is commonly known by its trade name of Freon-12. It is a CFC and has the chemical formula CF2Cl2. Thus each molecule is composed of a single carbon atom with four atoms connected to it; two chlorine atoms and two fluorine atoms. The proper chemical name for this substance is dichlorodifluoromethane.
R12 has a boiling point of -22 F and exhibits low reactivity with common materials such as metals. DuPont introduced it in 1931 for the purposes of refrigeration and also as a propellant for aerosol spray cans and it was in very wide use for many years.
R134a
R134a is a hydrofluorocarbon with the chemical structure CH2FCF3. Its proper name is 1, 1, 1, 2-tetrafluoroethane and each molecule consists of one carbon atom connected to a hydrogen atom, two fluorines and another carbon atom. This second carbon atom connects to three fluorine atoms. Its properties are very similar to R12, including its boiling point of -14.8 F. However, it has very little ozone depletion potential due to the fact that it contains only fluorine which does not participate significantly in ozone destruction.
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