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EFFECTIVE
STACK
HEIGHT:
The
height
at
which
a
plume
becomes
essentially
level.
It
is
the
actual
stack
height
plus
the
plume
rise.
EFFICIENCY:
The
relative
ability
of
an
air
cleaner
to
collect
contaminants,
usually
expressed
in
percent.
There
are
many
methods
used
to
measure
air
cleaner
efficiency.
Results
achieved
with
different
methods
and
contaminant
samples
may
not
be
directly
comparable.
Both
the
basis
and
test
method
must
be
fully
stated
if
efficiency
figures
are
to
be
meaningful.
EFFICIENCY,
MECHANICAL
TOTAL:
The
ration
of
fan
output
to
the
power
applied
to
the
fan.
Can
be
helpful
in
selecting
fan
size,
type
or
manufacturer
for
the
same
application:
ME
=
TP
x
CFM
6,356
x
BHP
EFFICIENCY,
STATIC:
The
ratio
of
fan
output
less
the
kinetic
energy
(outlet-velocity
pressure)
leaving
the
fan
to
the
power
applied
to
the
fan:
SE
=
SP
xCFM
6,356
x
BHP
EFFLUENT:
A
discharge
or
emission
of
a
fluid
(liquid
or
gaseous).
ELECTROSTATIC
DUST:
Particles
that
tend
to
receive
and
retain
a
static
charge,
such
as
fiberglass,
paint
pigments,
plastics,
etc.
ELECTROSTATIC
ATTRACTION:
Mutual
attraction
caused
by
static
electricity,
by
which
particles
tend
to
draw
together
or
adhere.
ELECTROSTATIC
PRECIPITATOR:
The
two
types
of
electrostatic
precipitators
are
the
Cottrell-type
(single-stage)
and
the
Penny-type
(two-stage).
The
Cottrell-type
combines
ionization
and
collection
in
the
same
field
while
the
Penney-type
places
the
ionizer
and
the
collection
plates.
With
either
type,
particles
entering
the
ionization
field
receive
an
electrostatic
charge.
These
charged
particles
are
then
collected
on
the
grounded
collection
plates.
The
Cottrell
single-stage
precipitator
operates
at
ionization
voltages
from
40,000
to
70,000
colts
DC.
It
may
also
be
called
a
high
voltage
precipitator
and
is
used
to
collect
particles
in
application
such
as
utility
boilers.
The
Penney
two-stage
precipitator
uses
DC
voltages
from
11,000
to
14,000
for
ionization
and
is
frequently
referred
to
as
low
voltage
precipitator.
It
is
used
to
collect
contaminants
in
applications
such
as
welding
or
oil
mist
and
smoke
from
machining
operations.
UAS
manufactures
the
SMOG-HOP
line
of
Penney-type,
two-stage
electrostatic
precipitators.
ELEVATION:
The
distance
of
the
subject
site
above
or
below
sea
level.
EMISSION:
Release
of
pollutants
into
the
air
from
a
source.
EMISSION
CONTROL
DIAGNOSTICS:
Computerized
devices
placed
on
vehicles
to
detect
malfunction
of
emissions
controls
and
notify
the
owner
of
the
need
for
repair.
EMISSION
CONTROL
EQUIPMENT:
Machinery
used
to
remove
air
contaminants
from
the
discharge
of
industrial
exhaust
streams.
EMISSION
FACTOR:
The
statistical
average
of
the
amount
of
a
specific
pollutant
emitted
from
each
type
of
polluting
source
in
relation
to
the
unit
quantity
of
material
handled;
processed
or
burned.
For
example,
the
emission
factor
of
oxides
in
nitrogen
in
fuel
oil
combustion
is
119
lbs.,
over
1,000
gallons
of
fuel
oil
used.
By
using
the
emission
factor
of
a
pollutant
and
specific
data
regarding
quantities
of
material
used
by
a
given
source,
it
is
possible
to
compute
emissions
for
that
source—information
necessary
for
an
emission
inventory.
EMISSION
INVENTORY:
A
list
of
primary
air
pollutants
emitted
into
a
given
community’s
atmosphere,
in
amounts
(commonly
tons)
per
day
by
type
of
source.
The
emission
inventory
is
basic
to
the
establishment
of
emission
standards.
Also
see
Emission
Factor.
EMISSION
STANDARD:
The
maximum
amount
of
a
pollutant
that
is
permitted
to
be
discharged
from
a
single
polluting
source;
such
as
the
number
of
pounds
of
fly
ash
per
cubic
foot
of
gas
that
may
be
emitted
from
a
coal-fired
boiler.
Rule
or
measurement
established
to
regulate
or
control
the
amount
of
a
given
pollutant
that
may
be
discharged
to
the
outdoor
atmosphere
from
its
source.
ENTHALPY:
The
heat
content
per
unit
mass
of
a
substance.
ENTRY
LOSS:
The
loss
in
pressure
caused
by
air
flowing
into
a
system;
normally
expressed
in
fractions
of
velocity
pressure.
EPA:
Environmental
Protection
Agency.
EQUIVALENT
DUCT
DIAMETER:
For
rectangular
duct
with
sides
“a”
and
“b”
is:
D
=
(4ab/p)0.5
EVAPORATION:
The
physical
transformation
of
a
liquid
to
a
gas
at
any
temperature
below
its
boiling
point.
EVASE:
A
diffuser
at
the
fan
outlet
that
gradually
increases
in
area
to
decrease
velocity
and
to
convert
kinetic
energy
to
static
pressure
(regain).
EXCESS
AIR:
Air
in
excess
of
the
amount
necessary
to
combust
all
the
available
fuel.
EXHAUST
GAS:
The
gases
emitting
from
an
industrial
process,
generally
a
combustion
process.
EXHAUST
STACK
TEMPERATURE:
The
temperature
of
the
exhaust
gas,
measured
in
the
discharge
stack.
EXHAUST
VOLUME:
The
amount
of
exhaust
gas
(air,
products
of
combustion
and
water
vapor)
leaving
the
exhaust
stack;
usually
measured
in
ACFM.
EXPLOSION
RELIEF
PANEL
(VENT):
Relief
device
designed
to
vent
the
pressure
created
during
an
explosion.
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