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Vapor-compression refrigeration is one of the many refrigeration cycles available for use. It has been and is the most widely used method for air-conditioning of large public buildings, private residences, hotels, hospitals, theaters, restaurants and automobiles. It is also used in domestic and commercial refrigerators, large-scale warehouses for storage of foods and meats, refrigerated trucks and railroad cars, and a host of other commercial and industrial services. Oil refineries, petrochemical and chemical processing plants, and natural gas processing plants are among the many types of industrial plants that often utilize large vapor-compression refrigeration systems.

Refrigeration may be defined as lowering the temperature of an enclosed space by removing heat from that space and transferring it elsewhere. A device that performs this function may also be called a heat pump .

lift&shift 101 asked: "What should be an average temp of the cold air coming out of the vents to know if a vehicles air conditioning is working properly when set on Max a/c using R-134A refridgerant?And how long should it take for the vehicles a/c unit be able to reach that temp at idle?"

Question posted courtesy of:

Tee replied: "It all depends on the outside temperature and the humidity. There are charts that can give you the real numbers. Check the library or google A/C performance charts."

Will S replied: "First of all you dont check the temp on max, you check it on 2 or 3 and for r134, 60 is decent. And whatever you do, dont use a digital thermometer as it's nowhere near an accurate temp out of the vents."

Coen replied: "Using R-134a almost the same using r-12 freon...:DNormal Temperature is arround 5~8º Celcius ,Its depends on your A/C system Conditions. Too Cold make an Ice deposits on your Evaporating Unit, it will damage the compressor unit if 'stuck'..:Du can setting the Temperature on Thermostat Unit,.. use + screwdriver to setting..:D"

randy_ishere replied: "MINE BLOWS OUT AT 38 DEGREES-"

Daniel asked: "Hi, i'm just wondering why automotive air conditioning systems on buses, cars, ect. needed to be re gassed every few years whilst refrigerators and split system A/C's in the home never really need to be re gassed?P.S. By never being re gassed i mean not needing to be re gassed for a long time as i have a 12 y/o fridge which is running the same is did when i bought it with no service ever done it, same with my split system A/C."

Question posted courtesy of:

OfcHando replied: "Think about it this way, is your car 12 years old? Older systems are a lot different than the things today, you take a car from the late 60's and a car from lets say today, and look under the hood. Normally you need to remove 14-15 things to do any of the work thats needed, yet the older car there is no remove this, take off that."

otsy replied: "they may run off a pressure system which needs topping up once in a while to keep working"

Leela replied: "the big difference is refrigerators don't have power and size restrictions like and air conditioner in a car. besides, i'll bet if you started driving your refrigerator around it would eventually need re gassed too."

Fred C replied: "My car is a 1995, and the a/c has never needed a top-up. But comparing it to the fridge or the home a/c is a little unfair. You don't drive your fridge down bumpy road, or gravel, you don't drag your home a/c down the road and throw it around corner, etc."

Lab replied: "Automotive A/C systems are classified as "mobile" systems. If it needs to be RECHARGED, there is a leak which must be fixed before any refrigerant can be added. Your fridge or A/C unit does not have wheels, so less luckily to break from vibrations/movement."

Paul replied: "I suspect that they are like tires, since there are rubber hoses in the system. Your fridge has all metal lines, so there is no leakage, until something breaks."

rmsmiley69 replied: "Just like a hydraulic system,an A/C system is a sealed system,ie,if you need to add,you have a leak.Have your mechanic,or yourself,do a vacuum leak test,or use a "sniffer" to check for escaping gas.If no luck there,try an ultraviolet die added to the system,that will usually pinpoint the leak. The difference between your fridge and car is that the fridge doesn't see as much abuse as the car."

tito replied: "I think its because refrigerator system are hermetically sealed ,all moving part of its refrigerating system are all sealed with in a metal housing and Cooper tubing . On automotive system there are rubber seal on the compressor that will harden with time,causing a small leak. [the seal is located on the middle of the compressor pulley where you put the A/C belt]"

Magneto replied: "To compare a stationary piece of equipment like a refrigerator to a vehicle is like comparing a broom to a vacuum cleaner,they both sweep the floor but the vacuum cleaner needs it's dust bags to be changed,in the case of the vehicle,the fittings steel lines and "o" rings,connections and even the ac compressor will loosen up by the constant movement and banging of the frame when it hits the rail road tracks,items on the road,bumping into other vehicles and so on,the stationary refrigerator's only worry is when the owner has to move it when he is kicked out of the rented house or the yearly cleanup done behind the refrigerator to get rid of the pile of empty potato chip bags."

Well functioning automotive air conditioning kits enhances your car air conditioning system to work at optimum capacity.

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automotive air conditioning