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AIR HANDLING AIR HANDLING SYSTEMSYSTEM
© Commonwealth of Australia 2010 | Licensed under AEShareNet Share and Return licence
Hello, I want to show you an air Hello, I want to show you an air handling system. This system delivers handling system. This system delivers and controls the flow of air to and and controls the flow of air to and from the air conditioned space. The from the air conditioned space. The basic parts that make up the air basic parts that make up the air handling system are:handling system are: supply air fansupply air fan air ductsair ducts air outlets and/or grillesair outlets and/or grilles bafflesbaffles filtersfilters return air fan.return air fan.
Let's look at each of these.Let's look at each of these.
© Commonwealth of Australia 2010 | Licensed under AEShareNet Share and Return licence
The supply air fan causes the air The supply air fan causes the air to pass through the evaporator to pass through the evaporator and then delivers the cooled air and then delivers the cooled air to the air conditioned space. to the air conditioned space. Supply air fans are usually Supply air fans are usually centrifugal fans and, in most centrifugal fans and, in most cases, use the induced air cases, use the induced air principle to draw the air through principle to draw the air through the cooling coil.the cooling coil.
© Commonwealth of Australia 2010 | Licensed under AEShareNet Share and Return licence
Air ducts used to deliver Air ducts used to deliver the air to the air the air to the air conditioned space from conditioned space from the cooling unit are the cooling unit are called supply air ducts.called supply air ducts.
Air ducts that return the Air ducts that return the air to the cooling unit air to the cooling unit for re-cooling are called for re-cooling are called return air ducts.return air ducts.
Other types of air ducts Other types of air ducts are fresh air ducts and are fresh air ducts and exhaust air ducts. exhaust air ducts.
© Commonwealth of Australia 2010 | Licensed under AEShareNet Share and Return licence
Air outlets or grilles Air outlets or grilles are fitted to air ducts are fitted to air ducts to control the air flow to control the air flow from the duct to the from the duct to the air conditioned space. air conditioned space. They often have a way They often have a way to allow adjustment of to allow adjustment of the quantity of air the quantity of air leaving the outlet and leaving the outlet and also to control the also to control the direction of the flow of direction of the flow of the air. the air.
© Commonwealth of Australia 2010 | Licensed under AEShareNet Share and Return licence
Baffles are fitted inside Baffles are fitted inside the ducts to adjust the the ducts to adjust the amount of air flowing amount of air flowing past a given point. past a given point. Baffles are throttling Baffles are throttling devices. devices.
© Commonwealth of Australia 2010 | Licensed under AEShareNet Share and Return licence
Filters are fitted in the Filters are fitted in the return air duct to filter return air duct to filter out particles prior to out particles prior to the air entering the the air entering the evaporator. evaporator.
© Commonwealth of Australia 2010 | Licensed under AEShareNet Share and Return licence
Return air fans draw the air Return air fans draw the air from the air conditioned space from the air conditioned space and deliver it to the cooling unit and deliver it to the cooling unit via the return air duct for re-via the return air duct for re-cooling. These fans are only cooling. These fans are only found on very large systems.found on very large systems.
© Commonwealth of Australia 2010 | Licensed under AEShareNet Share and Return licence
