period one

What Is Variable Air Volume?

notes

VAV–Part Load

Supply

=

 

20,000 Btu/hr

=

920 cfm

 

 

1.085 × (75°F – 55°F)

 

Airflow

 

 

 

 

 

 

 

 

Supply

 

 

5,862 W

 

 

3

 

 

 

 

 

 

 

 

Airflow

=

1,210 × (23.9°C – 12.8°C)

= 0.43 m /s

 

 

© American Standard Inc. 2001

 

 

 

 

 

 

 

 

Figure 11

 

 

 

 

 

 

Air Conditioning Clinic TRG-TRC014-EN

However, at part load, the VAV system produces a balance by modulating the volume of constant 55°F [12.8°C] supply air.

In this example, the air volume required to balance the lesser 20,000 Btu/hr

[5,862 W] space sensible load is:

Supply Airflow =

20,000 Btu/hr

920 cfm

1.085-----------------

×-----(--75-------°---F----------55------°---F----)=

 

Supply Airflow =

 

5,862 W

= 0.43m3⁄ S

 

 

 

1,210-----------------

×-----23.9------------°---C----------12.8------------°---C--

That is, 920 cfm [0.43 m3/s] of 55°F [12.8°C] supply air.

Why VAV? Energy Savings

Reduced fan energy

Reduced refrigeration energy

Figure 12

Why VAV?

One reason to use a VAV system is the potential for part-load energy savings.

The part-load energy savings inherent with the VAV system are twofold. First,

TRG-TRC014-EN

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Image 12
Trane TRG-TRC014-EN manual VAV-Part Load, Why VAV? Energy Savings, Reduced fan energy Reduced refrigeration energy

TRG-TRC014-EN specifications

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