Automobile Air Conditioning
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Due to varying conditions of heating, ventilating, cooling and dehumidification in atmosphere at various places, the air conditioning of automobiles is very essential. To maintain human comfort and improve internal atmosphere in an enclosed space, proper control of freshness temperature, humidity and cleanliness of air required.

In an automobile the air conditioning system involvs two main processes of heating and cooling. In the heating system, warm water from the engine cooling system is used. The heat required to warm the automobile is generally provided by circulating warm water through heating coil. For producing cooling effect the evaporator coil operated by refrigeration system is placed inside the chamber of automobile. The components used for producing cooling effect, its working are discussed here
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17-08-2011, 01:42 PM

pls can u send me ppt report on topic automobile air conditioning..
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To get more information about the topic "Automobile Air Conditioning" please refer the link below

Gagan kumar
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plz upload doc file of this project and implimentation
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Automobile air conditioning

.pdf   Automobile air.pdf (Size: 317.62 KB / Downloads: 29)


Automobile air conditioning systems cool the
occupants of a vehicle in hot weather, and have come
into wide use from the late twentieth century. Air
conditioners use significant power; on the other hand
the drag of a car with closed windows is less than if the
windows are open to cool the occupants evaporatively.
There has been much debate on the effect of air
conditioning on the fuel efficiency of a vehicle. Factors
such as wind resistance, aerodynamics and engine
power and weight have to be factored into finding the
true variance between using the air conditioning system
and not using it when estimating the actual fuel
mileage. Other factors on the impact on the engine and
an overall engine heat increase can have an impact on
the cooling system of the vehicle.


A company in New York City in the United States, first offered installation of air conditioning for cars in 1933. Most
of their customers operated limousines and luxury cars.[1]
The Packard Motor Car Company was the first automobile manufacturer to build air conditioners into its cars,
beginning in late 1939 (at the start of the 1940 model year).[2] These air conditioners were optional, and cost US$274
(equivalent to about US$4,000 in 2007).[3] The system took up half of the entire trunk space, was not very efficient,
and had no thermostat or independent shut-off mechanism.[4] The option was discontinued after 1941.[5]

Chrysler Airtemp

The 1953 Chrysler Imperial was the first production car in twelve years to actually have automobile air conditioning,
following tentative experiments by Packard in 1940 and Cadillac in 1941.[6] Walter P. Chrysler had seen to the
invention of Airtemp air conditioning back in the 1930s for the Chrysler Building, and had ostensibly offered it on
cars in 1941-42, and again in 1951-52, but none are known to have been sold in the latter form until the 1953 model
year. In actually installing optional Airtemp air conditioning units to its Imperials in 1953, Chrysler beat Cadillac,
Buick and Oldsmobile which added air conditioning as an option in the 1953 model year.
Airtemp was more sophisticated and efficient than the complicated rival air conditioners of 1953. It recirculated,
rather than merely cooled, the air inside the vehicle, and it was also the highest capacity unit available on an
automobile. It was also simple to operate, with a single switch on the dashboard marked with low, medium, and high
positions, which the driver selected as desired. The system was capable of cooling a Chrysler from 120 degrees to 85
degrees in about two minutes, and of completely eliminating humidity, dust, pollen and tobacco smoke at the same
time. Since it relied on fresh air, and drew in sixty percent more of it than any contemporary system, Airtemp
avoided the staleness associated with automotive air conditioning at the time. It was silent and unobtrusive. Instead
of plastic tubes mounted on the package shelf as on GM and on other cars, small ducts directed cool air toward the
ceiling of the car where it filtered down around the passengers instead of blowing directly on them, a feature that
modern cars have lost.

Nash integrated system

In 1954 the Nash Ambassador was the first American automobile to have a front-end, fully integrated heating,
ventilating, and air-conditioning system.[7][8] The Nash-Kelvinator corporation used its experience in refrigeration to
introduce the automobile industry's first compact and affordable, single-unit heating and air conditioning system
optional for its Nash models.[9][10] This was the first mass market system with controls on the dash and an electric
clutch.[11] This first true refrigerated air conditioner system was also compact and easily serviceable with all of its
components installed under the hood or in the cowl area.[12]
Combining heating, cooling, and ventilating, the new air conditioning system for the Nash cars was called the
"All-Weather Eye"[13] This followed the marketing name of "Weather Eye" for Nash's fresh-air automotive heating
and ventilating system that was first used in 1938.[12] With a single thermostatic control, the Nash passenger
compartment air cooling option was described as "a good and remarkably inexpensive" system.[14] Entirely
incorporated within the engine bay, the combined heating and cooling system had cold air for passengers enter
through dash-mounted vents.[10] Nash's exclusive "remarkable advance" was not only the "sophisticated" unified
system, but also its $345 price that beat all other systems.[15]

Automatic climate control

Most competing systems used a separate heating system and an engine-mounted compressor, driven off of the
crankshaft of the engine via a belt, with an evaporator in the car's trunk to deliver cold air through the rear parcel
shelf and overhead vents. General Motors made a front mounted air conditioning system optional in 1954 on
Pontiacs with a straight-eight engine that added separate controls and air distribution. The alternative layout
pioneered by Nash "became established practice and continues to form the basis of the modern and more
sophisticated automatic climate control systems."[16]

Growth in demand

The innovation was adopted quickly, and by 1960 about 20% of all cars in the U.S. had air-conditioning, with the
percentage increasing to 80% in the warm areas of the Southwest.[17] American Motors made air conditioning
standard equipment on all AMC Ambassadors starting with the 1968 model year, a first[18] in the mass market with a
base price starting at $2,671.[19] By 1969, 54% of the domestic automobiles were equipped with air conditioning,
with the feature needed not only for passenger comfort, but also to increase the car's resale value.

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