Air conditioning systems
Air conditioning systems may include the window air conditioner, the ductless air conditioners, the central air conditioner and the portable air conditioners. The impact of an air conditioning unit on its surrounding will depend on the type and size of the unit. In addition to buildings, air conditioning can be used for many types of transportation, including automobiles, buses and other land vehicles, trains, ships, aircraft, and spacecraft.
The AC has major parts such as the compressor, the condenser, the evaporator, the drier or the accumulator and the pipes and valves involved in controlling movement of Freon.
Window unit air conditioners are installed in an open window. They have two units, the evaporative on the inside and the condensing unit on the outside to expel heat from a room. They are called unitary air conditioning systems as they have all the components tailored to a size that can fit a compact box. They are mostly found in hotels where each individual controls their room temperature.
PTAC systems are also known as wall-split air conditioning systems or ductless systems. These PTAC systems which are frequently used in hotels have two separate units, the evaporative unit on the interior and the condensing unit on the exterior, with an opening passing through the wall and connecting them. PTAC systems may be adapted to provide heating in cold weather, either directly by using an electric strip or by reversing the refrigerant flow to heat the interior and draw heat from the exterior air, converting the air conditioner into a heat pump. While room air conditioning provides maximum flexibility, when used to cool many rooms at a time it is generally more expensive than central air conditioning.
A portable air conditioner can be easily transported inside a home or office. They are currently available with capacities of about 1,800–18,000 W output and with or without electric-resistance heaters. Portable air conditioners are either evaporative or refrigerative.