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Advantages of Vari-Flow system vs. Dual duct VAV box systems.
- Greater individual comfort and temperature control. The VAV box system, as
drawn, has 18 zones of control.
The Vari-Flow system
 has 55 zones of control.
- Greater overall comfort. Vari-Flow VAV diffusers provide excellent mixing
of primary & secondary air by maintaining (or increasing) their discharge air
velocity across their operating range. VAV box systems with constant volume
diffusers perform well at full flow. This occurs only 5% - 10% of the typical
operating time. As VAV box systems turn down, constant volume diffusers may
begin to dump, causing occupant discomfort. Due to our VAV diffuser's variable
discharge area, Vari-Flow VAV diffusers will not dump under any load condition.
- Lower installed cost. Utilizing
Vari-Flow VAV diffusers and regain duct
design, the air distribution system is greatly simplified requiring less
materials and labor.
- Energy will be saved. Since there are 55 zones vs. 18 zones no space will
be overcooled to make another comfortable.
- System design flexibility. With regain system design, using constant size
duct run-outs, the entire volume of air can be shifted and taken off anywhere
along the entire length of the run-out. With this flexibility, as; use,
tenancy, load, or zone changes occur, during the life of the building, the air
distribution system will be able to accommodate these changes. This will be
accomplished by simply moving existing Vari-Flow diffusers and or adding
additional Vari-Flow diffusers to accommodate remodeling and tenant
improvements. Adding Vari-Flow diffusers is as easy as tapping a start-collar
into the regain run-out and attaching it to a Vari-Flow diffuser with flex
duct. While partitions, office spaces, and tenancy will likely change during
the life of the building the total block load for office buildings will not.
With VAV boxes the zones and control points are fixed. Since each
Vari-Flow
diffuser is a self-contained zone of control, no additional controls or
installation is required.
Next: Perimeter Zone sequence of operation -
Heating
pg. 2. |
