period two

Components of a VAV System

notes

Parallel, Fan-Powered

plenum

airterminal mixing fan

primary air

supply air

Figure 28

A parallel, fan-poweredterminal unit consists of a primary airflow modulation device and a small, integral, constant-volume fan packaged to provide parallel airflow paths.

Parallel, Fan-Powered

100%

 

 

 

maximum

heating

 

tempering

primary

 

 

 

 

airflow

to space

plenum air

 

 

airflow

 

minimum

 

 

 

 

 

 

primary

%

 

primary air

airflow

 

 

 

0%

 

 

 

 

design

 

space load

 

design

heating load

cooling load

 

Figure 29

In the cooling mode, the unit is controlled in the same manner as the cooling- only unit. Primary airflow is reduced as the cooling load in the space decreases. When the space cooling load drops below the minimum primary airflow setting for the unit, overcooling the space, the small fan activates to mix warm plenum air with the cool primary air. This increases the total airflow to the space and creates a warmer supply air condition. If additional heating is required, with the terminal fan on, a heating coil can be used to further warm the supply air.

Operating the fan is a form of energy recovery. It tempers the supply air with heat from the building and lights carried by the return air, rather than with “new” energy, thus delaying the start of the heating coil.

18

TRG-TRC014-EN

Page 23
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Trane TRG-TRC014-EN manual Parallel, Fan-Powered

TRG-TRC014-EN specifications

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