Heating Systems from Ching Visual Dictionary of Architecture

Heating Systems from Ching Visual Dictionary of Architecture

All-water system = an air conditioning system in which either hot or chilled water is piped to fan-coil units in the served spaces, where air is circulated locally.

two pipe system = All water system in which one pipe supplies the hot or chilled water to fan coil units, and the other pipe returns it to the boiler or chilled water plant.

Four pipe system = all water system in which separate hot water and chilled water piping circuits provide for simultaneous heating and cooling as needed in various zones of a building.

supply pipe = a pipe for conveying hot or chilled water from the boiler or chilled water plant to a can coil unit.

return pipe = a pipe for conveying water from a fan coil unit to the boiler or chilled water plant

terminal unit = any of various devices for delivering a heating or cooling medium to a space.

fan coil unit = A terminal unit containing an air filter, heating or cooling coils, and a centrifugal fan for drawing in a mixture of room air and outside air.

coil = a connected series of pipes or tubing in rows or layers, often having fins attached to dissipate heat.

All air system = an air conditioning system in which central fans distribute conditioned air to the served spaces by means of ductwork.

single duct system = an all air system in which a single duct conveys conditioned air to the served spaces

constant air volume system = an all air system in which a master thermostat automatically regulates the quantity of conditioned air supplied to each zone.

variable air volume system = an all air system in which a thermostatically controlled variable volume box regulates the quantity of conditioned air supplied to each zone.

terminal reheat system = an all air system in which a reheat coil regulates the temp. of the air being furnished to each individually controlled zone.

multizone system = a central air handling unit capable of serving up to eight zones simultaneously.

zone = a space or group of spaces in a building whose temp. and air quality is regulated by a single control.

mixing box = a chamber for proportioning and blending cold and warm air under thermostatic control to reach the desired temp..

reheat coil = an electric or hot water coil for raising the temp. of the air in the supply duct of an air conditioning system.

air water system = an air conditioning system in which high velocity ducts supply conditioned air from a central plant to each zone where it mixes with room air and is further heated or cooled in an induction or fan coil unit.

induction unit = a terminal unit in which primary air draws in room air through a filter and the mixture passes over coils that are either heated or chilled by secondary water from a boiler or chilled water plant.

high velocity duct = a small duct capable of conveying primary air at a velocity of 2,4oo fpm or higher.

primary air = the conditioned air supplied at a high pressure and high velocity by a central air handling unit.