Ventilation+Systems

Juan Gamez The Science Behind a Ceiling Fan

According to the Britannica encyclopedia. Ventilating is a n atural or mechanically induced movement of fresh air into or through an enclosed space. The hazards of poor ventilation were not clearly understood until the early 20th century. Expired air may be laden with odors, heat, gases, or dust. Mechanical ventilation systems typically include a fan and filter to remove particles. A mechanically powered inlet of air, when combined with a natural exhaust, tends to cause a slight positive pressure within an enclosed space, so that the air leakage is outward. A mechanical exhaust with a natural air inlet causes a slight negative pressure, so that air moves inward. Such systems are often used to confine fumes or smells to a particular area of a building (e.g., laboratories, kitchens, bathrooms) and exhaust them to the outside.   When we talk about ventilation, 8 out 10 people will say a fan. Fans play a huge role in ventilation; fans is the mechanically way to get air to move around.

We all know that heat rises up. that is why most of the heating systems are around the floors. or on the lower area of a space. cold air drops, or comes down. for having a greater molar mass, than warm or heated air.

the science behind heating and cooling systems is the way how the fan rotate. Fans rotated different in winter or summer.

During the cold winter, we have the heating system going on. and in most cases we don't have the fans working. that is not good, because we need the air to circulate. that is why the fan during the winter should rotate in the blowing mode, so all the heat that is around the celling can drop. and that way heat up the whole space in less time, and be more efficient and perhaps save some money.

During the hot summer, the circulation of the fans should rotate in the the other mode, the abstraction mode. Sucking up all the could air that is below. ( Most AC systems are in higher areas of walls). by doing this the could air will feel better because will spread around better. Bibliography:

http://www.reference.com/browse/fan+ Britannica Encyclopedia. Google image JP4053