Air Conditioning

is a process that simultaneously conditions air; distributes it combined with the outdoor air to the conditioned space; and at the same time controls and maintains the required space’s temperature, humidity, air movement, air cleanliness, sound level, and pressure differential within predetermined limits for the health and comfort of the occupants, for product processing, or both.

Comfort Air-conditioning – a process of controlling the air temperature, relative humidity, ventilation, air movement and air cleanliness of a given space in order to provide the occupants with a comfortable indoor temperature.

Air-conditioning System – consists of a group of components or equipment connected in series to control the environmental parameters.

An air-conditioning or HVAC&R system consists of components and equipment arranged in sequential order to heat or cool, humidify or dehumidify, clean and purify, attenuate objectionable equipment noise, transport the conditioned outdoor air and recirculate air to the conditioned space, and control and maintain an indoor or enclosed environment at optimum energy use.

The types of buildings which the air-conditioning system serves can be classified as:

• Institutional buildings, such as hospitals and nursing homes

• Commercial buildings, such as offices, stores, and shopping centers Air-Conditioning and Refrigeration

• Residential buildings, including single-family and multifamily low-rise buildings of three or fewer stories above grade

• Manufacturing buildings, which manufacture and store products