period two

Components of a VAV System

notes

VAV Reheat

primary air

 

terminal

 

heating coil

supply

 

air

Figure 25

VAV reheat terminal units provide supply-air tempering or space heating by reheating the cool primary air. This is accomplished by adding an electric, or hot-water, heating coil to the discharge of a cooling-only unit.

The VAV reheat terminal unit is typically used for those zones that require seasonal cooling and heating, such as exterior zones of a building.

VAV Reheat

100%

heating coil active

 

maximum

 

 

primary

 

heating

tempering

airflow

space

 

 

 

minimum

to

 

 

heating

airflow

 

 

airflow

 

 

minimum

%

 

 

 

primary air

cooling

 

 

 

 

airflow

 

 

 

0%design

space load

design

heating load

cooling load

 

 

Figure 26

In the cooling mode, the unit is controlled in the same manner as the cooling- only unit. The supply 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 heating coil warms (tempers) the primary air to balance the low space cooling load. When space heating is required, the heating coil further warms the primary air to satisfy the space heating load.

16

TRG-TRC014-EN

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Image 21
Trane TRG-TRC014-EN manual VAV Reheat, Primary air

TRG-TRC014-EN specifications

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