compression or Absorption Refrigeration

compression or Absorption Refrigeration

compression or Absorption Refrigeration

Instructions/Descriptions

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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.

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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.

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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:

What variables are involved in heating and cooling loads?

Variables for calculating heating and cooling loads include design temperature differences, area of building components, data for calculating infiltration or ventilation loss or gain, number of people occupy the building, and the number of lights and appliances for the building. For most cooling applications, solar gain must also be considered.

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J V

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

The different parts that make up a forced air system are the following, blower, supply ductwork, registers, return ductwork and grills, and their purpose are as follow;

Blower – is what takes the heated or cooled air created within the furnace and circulates it throughout the home in order to ensure the desire temperature.

Supply Ductwork – carries the required air flow rate from the furnace to building spaces to provide comfort.

Registers – are capable of being opened and closed to determine how much air flow is needed for comfort. These are commonly installed in walls underneath the furnace or in the floor.

Return Ductwork – balance airflow in the system, their primary role is to bring air back that has been warmed or cooled to the furnace. The air is then reheated or cooled, filtered and redistributed back to the home.

Grills – vent cover which air blows into or out of a room for air circulation. Grills don’t have any damper, so the air flows freely.

Respond to J V:

What is temperature stratification and how can it be managed?

Temperature Stratification is the variation of air temperature in a building that occurs when hot air arises to the ceiling and cold air drops to the floor. Temperature stratification can be managed by the use of axial fans and high volume, low speed fans, which will help combined warm and cool air.

Respond to J V:

J R

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. Gross wall area is calculated separately for each exposed wall.

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

Respond to J R:

What variables are involved in heating and cooling loads?

Variables include design temperature difference, areas of exposed building surfaces, infiltration or ventilation rates, people, lights, and appliances.

Respond to J R:

D R

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

A forced air system consists of a blower, supply ductwork, registers, return ductwork and grills. The blower is a mechanical device that consists of moving blades or vanes for the purpose of forcing air through a venturi. Blowers move air at the required airflow rate against the resistance of the ducts and fittings in the distribution system. The supply and return ductwork go together because they are dependent on each other. Since this system recycles air from each room, warm air travels through a supply duct and once cooled down, it travels back to the vents through a return duct. Registers are devices that cover the opening of the supply air ductwork and grills cover the opening of the return air ductwork for the purpose of allowing the proper amount of air to flow into each building space to offset the heat loss or gain.

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compression or Absorption Refrigeration

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