| Air conditioning is the cooling and air for comfort, the | | | | trips in a vehicle. Often air conditioners are fitted in cars |
| term can refer to any form of cooling, heating or | | | | in hot climate. There has been much debate and |
| ventilation that modifies the condition of air. An air | | | | discussion on what the usage of an air conditioner |
| conditioner is an instrument, system, or machinery | | | | does to the fuel efficiency of a vehicle. Wind |
| designed to calm down the air temperature and | | | | resistance and engine power and weight are the |
| humidity within an region, typically using a refrigeration | | | | factors that have to be factored into finding the true |
| cycle but sometimes using evaporation, commonly for | | | | variance between using the air conditioning system |
| comfort cooling in buildings and motor vehicles. | | | | and not using it when figuring out difference in actual |
| History | | | | gas mileage. Other factors on the impact on the |
| In ancient Rome the concept of conditioning of air is | | | | engine and an overall engine heat increase can have |
| known to them, where channel of water was | | | | an impact on the cooling system of the vehicle. |
| circulated through the walls of certain houses to cool | | | | Air conditioning applications |
| them. During the 19th century the advances in | | | | Air conditioning applications are based on what one |
| chemistry let to development of modern air | | | | wants- process or comfort. |
| conditioning, and the first large-scale electrical air | | | | (a) Comfort applications provide a building indoor |
| conditioning was invented and used in 1902 by Willis | | | | environment that remains relatively constant in a range |
| Haviland Carrier. | | | | preferred by humans despite changes in external |
| Humidity control | | | | weather conditions or in internal heat loads. |
| Air conditioning tools usually reduces the humidity of | | | | (b) Process applications offer a suitable atmosphere to |
| the air. From the processed air the coil evaporator | | | | carry out the process, regardless of internal heat and |
| condenses the water vapor, (much like an ice-cold | | | | humidity loads and external weather conditions. |
| drink will condense water on the outside of a glass), | | | | Although often in the comfort range, it is the needs of |
| sending the water to a drain and removing water | | | | the process that determine conditions, not human |
| vapor from the cooled space and reducing the relative | | | | preference. Process applications include these: |
| humidity. Since the human perspire to make himself | | | | Portable air conditioners |
| cool by the evaporation of perspiration from the skin, | | | | A portable air conditioner is one on wheels that can be |
| drier air (up to a point) improves the comfort provided. | | | | easily transported inside a home or office. Presently |
| The comfort air conditioner is designed to create a | | | | you can get them with capacities of about 6,000 to |
| 40% to 60% relative humidity in the occupied space. | | | | 60,000 BTU/h (1,800 to 18,000 watts output) and with |
| Air conditioners automobiles | | | | and without electric resistance heaters. Portable true |
| Air conditioner systems are designed in a way that the | | | | air conditioners are available in two patterns, split and |
| driver and or passengers get to feel more | | | | hose. Evaporative coolers are also portable. |
| comfortable during uncomfortably warm humid or hot | | | | |