What are the types of all air distribution systems?
Types of Air Distribution Systems Air-distribution systems fall into two broad categories, constant-volume (CV) and variable-air-volume (VAV).
What are the elements of air distribution system?
Major elements of the air distribution system are a plenum chamber, air channels, and air ducts or false floors.
What is central air distribution system?
Air distribution refers to the distribution of air to and from conditioned spaces within a building. An air distribution system includes all sub-components, such as fans, filters, dampers, ductwork, etc. Air distribution systems come in a variety of material types, for example, fiberglass and galvanized metal.
What is VRF system?
Also referred to as a VRF system, variable refrigerant flow is a technology that circulates only the minimum amount of refrigerant needed during a single heating or cooling period. This mechanism introduced the opportunity for end users to individually control several air conditioning zones at one time.
How many types of HVAC systems are there?
four
There are four main types of HVAC systems. There are split systems, hybrid systems, duct-free systems, and packaged heating and air systems.
What are the components of an air distribution system?
Constant-Volume Systems 3 Variable Air Volume Systems 5 8.3 Air-Handling Components 6 Fans 7 Filters 7 Ducts 9 Dampers 10 8.4 Best Opportunities 10
How does a dual duct air distribution system work?
A dual-duct system uses a single fan to move air through both cooling and heating coils in the air handler, distributing the air through separate hot and cold ducts. Depending on the zone requirements, the air streams may either blend at a terminal mixing box or provide just cooling. Another constant-volume system is the multizone unit.
Where are the coils located in an air distribution system?
The coils are located on the high-pressure or outlet side of the fan. Because fan-discharge air is turbulent, the coil must be far enough downstream from the fan to ensure sufficiently laminar air flow for effective heat transfer. These systems are usually larger than draw-through units.
How are pressure plates used in air distribution systems?
Alternately, a pressure plate (a perforated sheet-metal plate) can be installed downstream from the fan discharge to ensure laminar air flow across the coil. This shortens the casing length but causes a significant pressure drop in the system, increasing energy use. Packaged systems are primarily associated with single-duct systems.
Which is part of the air distribution system?
Major elements of the air distribution system are a plenum chamber, air channels, and air ducts or false floors. The plenum chamber is a chamber into which a fan delivers the drying air before it enters the grain bulk.
A dual-duct system uses a single fan to move air through both cooling and heating coils in the air handler, distributing the air through separate hot and cold ducts. Depending on the zone requirements, the air streams may either blend at a terminal mixing box or provide just cooling. Another constant-volume system is the multizone unit.
Alternately, a pressure plate (a perforated sheet-metal plate) can be installed downstream from the fan discharge to ensure laminar air flow across the coil. This shortens the casing length but causes a significant pressure drop in the system, increasing energy use. Packaged systems are primarily associated with single-duct systems.
How does an underfloor air distribution system work?
A variation on VAV design is the underfloor air-distribution system. Low-pressure supply air moves from the air handler (or supply-air shaft) into an underfloor air plenum. The supply air then moves directly though the diffusers into the conditioned space or into terminal units that may add heat to the air before entering the conditioned space.