period one

What Is Variable Air Volume?

notes

Variable-Air-Volume (VAV) System

EARA

OA

supply

PA

fan

 

 

 

cooling

VAV

box

coil

variable-

 

speed drive

 

 

thermostat

SA

 

 

Figure 9

In contrast, a variable-air-volume (VAV) system delivers the primary air at a constant temperature and varies the airflow to maintain the required space temperature at all load conditions.

VAV–Full Load

Supply

=

 

40,000 Btu/hr

=

1,840 cfm

 

1.085 × (75°F – 55°F)

Airflow

 

 

 

 

 

Supply

=

 

11,724 W

 

 

= 0.87 m3/s

1,210 × (23.9°C – 12.8°C)

Airflow

 

 

Figure 10

Similar to the constant-volume system, at design conditions the VAV system will balance the same 40,000 Btu/hr [11,724 W] space sensible load with the same 1,840 cfm [0.87 m3/s] of 55°F [12.8°C] supply air.

6

TRG-TRC014-EN

Page 11
Image 11
Trane TRG-TRC014-EN manual Variable-Air-Volume VAV System, VAV-Full Load

TRG-TRC014-EN specifications

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