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Los sistemas centrales son una combinación de subsistema de suministro central y múltiples subsistemas de uso final. Los subsistemas de uso final pueden ser sistemas de ventiladores o unidades terminales. Si los subsistemas de uso final son sistemas de ventiladores, pueden ser del tipo de zona única o múltiple. Con los sistemas centrales, la conversión primaria de combustible como gas o electricidad tiene lugar en una ubicación central, con alguna forma de energía térmica distribuida por todo el edificio o instalación.
There are many variations of combined central supply and end use zone systems. The most frequently used combination is central hot and chilled water distributed to multiple fan systems. The fan systems use water-to-air heat exchangers called coils to provide hot and/or cold air for the controlled spaces. Another combination central supply and end use zone system is a central chiller and boiler for the conversion of primary energy, as well as a central fan system to delivery hot and/or cold air. The multiple end use zone systems are mixing boxes, usually called VAV boxes. The typical uses of central systems are in larger, multistoried buildings where access to outside air is more restricted. Typically central systems have lower operating costs.
Besides packaged unitary and central systems, there are a variety of special-purpose systems. These include the following:
1. Heat pump cycles on chillers that use rejected heat or tower cooling.
2. Thermal storage.
3. Cogeneration of electricity and heat.
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