Discuss the parts of a forced air system and their purpose.

Air conditioner-component that cools the air. Uses either the mechanical compression or absorption refrigeration process to provide a refrigeration effect.

Blower- moves air across the evaporator coil, circulates it through supply ductwork into the building spaces, and returns the air through return ductwork from the building spaces.

Supply ductwork- runs from the blower in the air conditioner to building spaces.

Return ductwork- returns air from the building spaces to the air conditioner for reuse.

Registers-device that covers the opening of the supply air ductwork. Sized and located to provide the proper amount of air required in each building space.

Grills- device that covers the opening of a return air ductwork. Sized and located to provide proper circulation of the air through the building.

Respond to I D:

What is temperature stratification and how can it be managed?

Variation of air temperature in a building space that occurs when warm air rises to the ceiling and cold air drops to the floor. It can be managed by having proper and continuous circulation of air in a building.

Respond to I D:

D G

What is the difference between gross and net wall area.

Gross wall area is the total area of a wall including windows, doors, and other openings. This is calculated separately for each exposed wall of a building. The following formula is used to find the gross wall area:

Ag = w x h

where Ag = gross wall area (in sq. ft), w = width (in ft), h = height (in ft)

Net wall area is the area of a wall after the area of the windows, doors, and other openings have been subtracted. Net wall area is used for calculating heating and cooling loads. Net wall area is found by applying the following formula:

An = Ag – Ao

where An = Net wall area (in sq.ft), Ag = gross wall area (in sq. ft), Ao= area of opening (in sq.ft)

Respond to D G:please don’t contact me in you cant do it. feel free to ask any questions.