White Rodgers 1F85-277 Guia de Resolução de Problemas descarregar pdf (Página 105)

COMMERCIAL OR OFFICE AIR CLEANERS

The correct number of commercial or ofﬁce electronic air

cleaners require for a particular application depends upon:

• Type of contamination

• Use of the room

• Number of occupants

The number of air changes per hour determines the

amount of air cleaning obtained. More air changes per

hour than recommended in the graph above are usually

unnecessary as the ASHRAE data for which it was con-

structed is conservative. Fewer air changes per hour than

recommended in the graph may mean allowing the entrance

of more outdoor air to maintain acceptably low containment

levels, or tolerating a partially cleaned atmosphere, which

may be acceptable to some users.

EXAMPLE 1

Sizing By Air Changes Per Hour And Room Area

Using the graph on this page:

1. Extend a horizontal line from the desired number of air

changes per hour until it intersects with a vertical line

drawn upward from the area of the room.

2. The intersection point indicates the number of units

required.

A restaurant has a 35 x 45 foot dining room. How many air

cleaner units would be installed?

Solution:

1. Find ﬂoor area, 35 ft. x 45 ft. = 1575 sq. ft.

Assuming that 10 air changes per hour would be

adequate and an 1575 sq. ft. area, the graph indicates

a requirement for two thousand cfm. Three 750 cfm units

or one 1500 cfm and one 750 cfm units meet this require-

ment.

EXAMPLE 2

Sizing By Air Changes Per Hour And Room Volume

Restaurant proprietor wants to use electronic air cleaning to

remove cigarette and cigar smoke from the air. The dining

area is 25 x 40 feet with a 15 ft. ceiling. How many air clean-

ers will be required on this job?

Solution:

1. Calculate the volume of room, 25 ft. x 40 ft. x 15 ft. =

15,000 cu. ft.

2. Determine the volume of air to be circulated each hour.

10 air changes per hour is used on the assumption that

the intent is to substantially reduce, but not necessarily

eliminate smoke.

15,000 cu. ft. x 10 air changes/hour = 150,000 cu. ft./hr.

150,000 cu. ft./hr v60 min./hr = 2,500 cu. ft./min.

3. Determine the number of air cleaners required.

Desired Circulation v Air Cleaner Capacity = units re-

quired 2500 cfm v 750 cfm = 3.3. Three or four 750 cfm

units meet this requirement.

EXAMPLE 3

Sizing By Occupant Load

A cocktail lounge averages 85 occupants. Using the

ASHRAE recommended minimum of 35 cfm per person.

Solution:

85 people x 35 cfm/per person = 2975 cfm

2975 cfm v 1000 cfm = 3.9 (Four 750 cfm units or two 1500

cfm units)

SIZING AND OZONE

Ozone is an active, natural form of oxygen produced by elec-

trical discharge, ultraviolet lights and other natural causes.

All electronic air cleaners generate small amounts of ozone

as a by-product of the particle-charging process. Correctly

installed and sized air cleaners do not generate ozone in

amounts that are health hazards.

Ozone is always present in the air we breathe. The amounts

of ozone vary in different parts of the world. Many scientiﬁc

research organizations throughout the world have performed

and/or continue to perform extensive tests in order to deter-

mine the effects of ozone on humans, plants and animals.

They have measured the level of ozone in many areas of the

world to determine what maximum limits exist in both clean

and polluted environments. In general, the latest scientiﬁc

research established a maximum ﬁgure of 0.1 parts per mil-

lion for humans with no more than eight hours exposure. The

United States Department of Health, Food and Drug Admin-

istration has established a maximum ozone concentration of

0.050 ppm.

Scientiﬁc measurements taken with the most accurate

equipment available show the range of ozone emitted from

White-Rodgers’ electronic air cleaners is between .005 and

.02 ppm. This is between 1/20 and 1/5 of the established

safe limits of 0.1 ppm. It is a negligible ﬁgure, in fact, if this

amount of ozone is considered to be harmful it would be

dangerous to take an afternoon walk in the park on a sum-

mer day.

SIZING CHART FOR COMMERCIAL AIR CLEANERS

INSTANT EXPERTSIZING AIR CLEANERS

www.white-rodgers.com

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