Friday 18 March 2016

Types of Fans used in Construction.

Generally there are 6 types of fans used in Mechanical Construction.

1. Axial Flow Fans:

There are four types of axial-flow fans. Listed in the increasing order of static pressure.
They are:
a. Propeller fans(PFs).
b. Tubeaxial fans(TAFs).
c. Vane axial fans(VAFs).
d. Two Stage Axial Flow fans.

2. Centrifugal Fans:

There are six types of centrifugal fan wheels in common use. Listed in the order of decreasing efficiency, They are:
a. Centrifugal fans with AirFoil(AF)blades
b. Centrifugal fan with Backward Curved(BC) blades.
c. Centrifugal fan with Backward Inclined(BI) blades.
d. Centrifugal fan with Radial Tip(RT) blades.
e. Centrifugal fan with Forward Curved(FC) blades.
f. Centrifugal fan with Radial blades(RBs).

3. Axial Centrifugal Fans.4. Roof Ventilators.5. Cross Flow Blowers.6. Vortex Regenerative Blowers.





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HVAC is the technology of indoor and vehicular environmental comfort. Its goal is to provide thermal comfort and acceptable indoor air quality. HVAC system design is a subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid mechanics, and heat transfer. Refrigeration is sometimes added to the field's abbreviation as HVAC&R or HVACR, (heating,ventilating and air-conditioning & Refrigeration) or ventilating is dropped as in HACR (such as the designation of HACR-rated circuit breakers). HVAC is important in the design of medium to large industrial and office buildings such as skyscrapers, onboard vessels, and in marine environments such as aquariums, where safe and healthy building conditions are regulated with respect to temperature and humidity, using fresh air from outdoors. Ventilating or ventilation (the V in HVAC) is the process of "exchanging" or replacing air in any space to provide high indoor air quality which involves temperature control, oxygen replenishment, and removal of moisture, odors, smoke, heat, dust, airborne bacteria, and carbon dioxide. Ventilation removes unpleasant smells and excessive moisture, introduces outside air, keeps interior building air circulating, and prevents stagnation of the interior air. Ventilation includes both the exchange of air to the outside as well as circulation of air within the building. It is one of the most important factors for maintaining acceptable indoor air quality in buildings. Methods for ventilating a building may be divided into mechanical/forced and natural types.