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.

  • The Compressor is the centre of your ac system its role is usually to compress the refrigerant thereby increasing its temperature. As the Freon absorbs heat it changes state from liquid to gas.
  • The Condenser is similar to a radiator though smaller in size. The condenser has an electric cooling fan, too. The hot, compressed air passes through the condenser and becomes cooler. As it cools, it becomes a liquid.
  • The Evaporator is the part where air is released and therefore passes through the cool refrigerant to deliver a cool breeze. The refrigerant becomes warmer here and changes back to gas as it takes heat from the air and absorbs it.
  • The Thermal Expansion Valve is responsible for the control of the flow of cool refrigerant to the evaporator.
  • The Drier or Accumulator is responsible for absorbing any liquid Freon that would otherwise escape using a desiccant. The desiccant absorbs all stray liquid Freon. This is important because the liquid would become corrosive and cause the compressor to become defective which is a very expensive part to replace.
  • 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.