Tuesday, January 3, 2017

TECHSHORE INSPECTION SERVICES : HVAC : VARIABLE AIR VOLUME (VAV ) BOX


Variable Air Volume (VAV) is generally used in heating, ventilation, and air-conditioning (HVAC) system.  Constant air volume (CAV) systems, which generally supply fixed or constant air flow with variable temperature. In VAV systems varying the airflow at a constant temperature. The advantages of VAV systems over CAV systems include more precise in temperature control, reduced compressor wear, lower energy consumption  which followed by system fans, less fan noise, and additional passive dehumidification.
The simplest VAV system which incorporates one supply duct, when in cooling mode, the supply air distribution at a constant temperature of approximately 55 °F (13 °C).Because the supply air temperature is constant, the air flow rate required to vary and meet the rising and falling heat gains or losses within the thermal zone served.

  1. av box or unit consists of VAV terminal box located in the space below ceiling.
  2. Vav box have supplemental blower motor for positive air flow to space
  3. It may have filtration.
  4. It has damper inside that opens and closes on demand from a thermostat to allow more or less airflow to space.

The following figure illustrates the images of a VAV box.
Fig.1
       
Fig.2





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Location: 36/977A Kattunilath, Lissie Hospital Road, Kochi, Kerala 682018, India

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