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Air Filtration > Chapter 1 - The Improtance of Air Filtration > Flashcards

Chapter 1 - The Improtance of Air Filtration Flashcards

1
Q

Define Air

A

A mixture of gasses composed of approximately 21% oxygen, 78% nitrogen, 1% argon and carbon dioxide, and traces of other gases

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2
Q

Where do building contaminants come from?

A 
building materials and finishes
building contents such as furniture and fixtures
people
processes
materials in the building
cooking odors
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3
Q

Define Aerosol

A

An assemblage of small particles, solid or liquid, suspended in air. The diameter of the particles may vary from 100 microns down to 0.01 micorns.

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4
Q

How do you measure the size of a aerosol?

A

Micrometers

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5
Q

How big is a micrometer?

A

A micrometer is one millionth of a meter or 1/25,400 inch

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6
Q

Define dust

A

An aerosol of particles of any solid material, usually with particle size less than 100 microns

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7
Q

Define EPA

A

Environmental Protection Agency. This is the Federal agency that is responsible for setting standards for waterborne and airborne sources of pollution in the United States

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8
Q

Define coarse particles

A

Formed by the mechanical breakup of solids larger than 3 micrometers

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9
Q

Define fine particles

A

Formed from chemical reactions or condensing gas with a max size of 1-3 micrometers

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10
Q

Define ASHRAE

A

American Society of Heating, Refrigeration, and Air-Conditioning Engineers

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11
Q

Define Brownian motion

A

The continuous zigzag motion of particles (aerosols) in suspension. The motion is caused by the impact of the molecules of the fluid (air) upon the particles

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12
Q

Define Bioaersols

A

Airborne biological materials including fungi, bacteria and their spores and viruses

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13
Q

Define Fumes

A

Solid aerosols formed by the condensation of vapors of solid materials

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14
Q

Define Comfort air conditioning

A

The process of treating air to simultaneously control its temperature, humidity, cleanliness, and distribution to meet the comfort requirements of all the occupants of the conditioned space.

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15
Q

Define Fog

A

Fogs are liquid aerosols formed by the condensation of water vapor in the air

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16
Q

Define Mists

A

Mists are liquid aerosols formed by the atomization of liquids

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17
Q

Define smokes

A

Smokes are solids and/or liquid aerosols formed by the incomplete combustion of organic substances

18
Q

Define Smog

A

Smog is a compound mixture of particulates and droplets seen as a haze caused by sunlight induced photochemical reaction

19
Q

Define Environmental Tobacco Smoke (ETS)

A

ETS is a compound mass of poly-dispersed smaller sized particles, fumes and vapors created from burning tobacco products

20
Q

How are particles measured?

A

By count or weight

21
Q

Define Gas

A

A gas is a material that has the tendency to expand indefinitely and which completely and uniformly fills the container it occupies

22
Q

Define Vapor

A

Vapors are gases formed by the evaporation of materials that are normally liquid of solid

23
Q

How are gasses formed

A

Gasses are formed in a chemical process where they are deliberately prepared for other uses or where they may be the unwanted by-product of a process, by the result of a biological process or from volatile organic compounds (VOCs)

24
Q

Define Space

A

Space is the defined area, usually enclosed by walls and a ceiling or the equivalent

25
Q

Define Ambient Air

A

Ambient air (room air) is the air which surrounds the occupant or a process in a space

26
Q

Define recirculated air

A

Recirculated air is air which has been taken from the space reconditioned and returned to the space

27
Q

Define return air system

A

Return air system is a combination of ductwork and fan which takes air from the space and returns it back to the conditioning equipment

28
Q

Define conditioning equipment

A

Conditioning equipment is the combination of air filters and other air cleaning devices, heating/cooling coils, and humidifiers that treat the air to be supplied to the space

29
Q

Define Outdoor air

A

Outdoor air is taken from outdoor atmospheric air

30
Q

Define Supply air

A

Supply air is a mixture of recirculated air and outdoor air that has been conditioned and deliver to the space

31
Q

Define supply air fan system

A

Supply air fan system is a combination of fan, ductwork, and diffusers which delivers supply air to the space

32
Q

Define Diffusers

A

Diffusers are terminal devices on the supply air fan system. They distribute the conditioned air through the space.

33
Q

Define aspirating diffusers

A

Aspirating diffusers mix supply air with ambient air before distributing the mixture through the space

34
Q

Define Non-aspirating diffusers

A

Non-aspirating diffusers discharge supply air directly into the space without mixing with ambient air

35
Q

Define Exhaust air

A

Exhaust air is air taken from the space and not reused theirin

36
Q

Define Exhaust fan system

A

Exhaust fan system is a combination of fan and ductwork which removes air from the space and discharges it to the outside atmosphere

37
Q

Define Make up air

A

Make up air is outdoor air supplied to replace exhaust air

38
Q

Define infiltration

A

Infiltration is air introduced into space through openings between the space and its surroundings when the amount of make up air is less then the exhaust air. This creates negative pressure

39
Q

Define exfiltration

A

Exfiltration is air moved out of the space through openings between the space and it surroundings when the amount of make up air is more than the exhaust air - positive pressure

40
Q

Define Blow through system

A

Blow through system is an HVAC system with the fan located upstream of the coils, air washer and final filters, all of this equipment is then under positive pressure and any leakage would be outward

Air Filtration (4 decks)

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