period two

Components of a VAV System

notes

conditions in the space. The constant sound of the series unit, with the fan

 

Most designers also believe that series units offer improved acoustical

 

operating whenever the space is occupied, is generally preferred to the on-off

 

sound generated by the cycling fan in the parallel unit.

 

However, because the fan runs continuously whenever the space is occupied, a

 

series fan-powered unit consumes more energy than a parallel fan-powered

 

unit. The development of high-efficiency motors has lessoned the energy

 

consumption difference. The fan in a series fan-powered unit also costs more

 

than an equivalent parallel fan-powered unit because it generally requires a

 

larger terminal fan.

 

Fan-powered terminal units without a heating coil are typically used to provide

 

tempering for those zones that require year-round cooling and have relatively

 

high minimum airflow settings, such as the densely occupied interior zones of a

 

building (i.e., a conference room). A fan-powered terminal unit with a heating

 

coil is typically used for spaces that require seasonal cooling and heating, such

 

as the exterior zones of a building. Units with heating coils are the most

 

common of the fan-powered terminal units.

Single-Duct VAV Systems

 

central air handler

 

OA

PA

55°F

90°F

 

[12.8°C]

[32.2°C]

 

 

 

VSD

 

RA

single-duct

EA

VAV terminal units

80°F

 

 

[26.7°C]

 

 

Figure 33

The types of terminal units discussed so far are used in single-duct VAV systems. Single-duct VAV systems use a central return-air path that allows the air from the spaces to come back to the air handler. At the air handler, a portion of this return air is recirculated and mixed with outdoor air (introduced for space ventilation purposes). This mixture of outdoor and recirculated return air, or primary air, is then conditioned and delivered to the VAV terminal units through the supply duct system.

The remainder of the return air is exhausted from the building.

TRG-TRC014-EN

21

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Trane TRG-TRC014-EN manual Single-Duct VAV Systems
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TRG-TRC014-EN specifications

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