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1. ALL AIR SYSTEM

   • All-air systems transfer cooled or heated air from a central plant via ducting, distributing air through a series of grilles or diffusers to the room or rooms being served.
   • APPLICATION
     • All air systems can be used in both comfort as well as industrial air conditioning applications.
     • They are especially suited to buildings that require individual control of multiple zones, such as office buildings, classrooms, laboratories, hospitals, hotels, ships etc
     • They are also used extensively in applications that require very close control of the conditions in the conditioned space such as clean rooms, computer rooms, operation theatres, research facilities etc

2. ALL WATER SYSTEM

   • Water based systems use a single chiller plant or chiller plus boiler to produce water which is then pumped around a building to, most commonly, fan coil units; a fan blows air over a coil containing the water, which then cools or heats the room air. The heat rejected from the room to the water is then pumped back to the chiller unit where it is rejected by a condenser to external air. The water is then chilled or heated again and pumped back to the room units.
   • APPLICATION
     • All water systems using fan coil units are most suitable in buildings requiring individual room control, such as hotels, apartment buildings and office buildings

3. AIR WATER SYSTEM

   • A separate air system is provided to supply fresh ventilation air to the space.
   • APPLICATION
     • These systems are mainly used in exterior buildings with large sensible loads and where close control of humidity in the conditioned space is not required. These systems are thus suitable for office buildings, hospitals, schools, hotels, apartments etc

4. DIRECT REFRIGERANT BASED SYSTEMS

   • The direct refrigerant cooling system consists of either a vapor compression or an absorption system. For direct refrigerant cooling, the liquid refrigerant is used directly in the cooling coils (evaporator coil(s)). The refrigeration system evaporator coils can be of many configurations. The refrigerant is usually pumped to the coils, using some type of overfeed system, and a pressure over feed system has been used in at least one ammonia refrigerant installation
   • APPLICATION
     • used where stringent control of conditioned space temperature and humidity is not required and where the initial cost should be low with a small lead time
     • These systems can be used for air conditioning individual rooms to large office buildings, classrooms, hotels, shopping centres, nursing homes etc
     • These systems are especially suited for existing building with a limitation on available floor space for air conditioning systems

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