Symbol
|
Term
|
Dimension
|
A
T
|
Cross-sectional area of the exhaust pipe
|
m2
|
C1
|
Carbon 1
equivalent hydrocarbon
|
-
|
conc
|
Concentration
|
ppm or
Vol%
|
concc
|
Background
corrected concentration
|
ppm or
Vol%
|
EAF
|
Excess air
factor (kg dry air per kg fuel)
|
kg/kg
|
EAFRef
|
Excess air
factor (kg dry air per kg fuel) at reference conditions
|
kg/kg
|
f
a
|
Laboratory
atmospheric factor (applicable only to an engine family)
|
-
|
F
FCB
|
Fuel-specific factor for the carbon-balance calculation
|
-
|
F
FD
|
Fuel-specific factor for exhaust flow calculation on dry basis
|
-
|
F
FH
|
Fuel-specific factor used for the calculations of wet concentrations from
dry concentrations
|
-
|
F
FW
|
Fuel-specific factor for exhaust flow calculation on wet basis
|
-
|
G
AIRW
|
Intake air
mass flow rate on wet basis
|
kg/h
|
G
AIRD
|
Intake air
mass flow rate on dry basis
|
kg/h
|
G
EXHW
|
Exhaust gas
mass flow rate on wet basis
|
kg/h
|
G
FUEL
|
Fuel mass
flow rate
|
kg/h
|
GASX
|
Average
weighted NOX emission value
|
g/kW
h
|
H
REF
|
Reference
value of absolute humidity (10.71 g/kg; for calculation of NOX
and particulate humidity correction factors)
|
g/kg
|
H
a
|
Absolute
humidity of the intake air
|
g/kg
|
HTCRAT
|
Hydrogen-to-carbon ratio
|
mol/mol
|
i
|
Subscripts
denoting an individual mode
|
-
|
K
HDIES
|
Humidity
correction factor for NOX for diesel engines
|
-
|
K
W,a
|
Dry to wet
correction factor for intake air
|
-
|
K
W,r
|
Dry to wet
correction factor for the raw exhaust gas
|
-
|
L
|
Percent
torque related to the maximum torque for the test engine speed
|
%
|
mass
|
Emissions
mass flow rate
|
g/h
|
pa
|
Saturation
vapour pressure of the engine intake air (in ISO 3046-1, 1995:
psy
= PSY, test ambient vapour pressure)
|
kPa
|
pB
|
Total
barometric pressure (in ISO 3046-1, 1995: p
x= PX, site ambient total pressure ; p
y= PY, test ambient total pressure)
|
kPa
|
ps
|
Dry
atmospheric pressure
|
kPa
|
P
|
Power,
brake-uncorrected
|
kW
|
P
AUX
|
Declared
total power absorbed by auxiliaries fitted for the test only, but not
required on board the ship
|
kW
|
P
m
|
Maximum
measured or declared power at the test engine speed under test
conditions
|
kW
|
r
|
Ratio of
cross-sectional areas of isokinetic probe and exhaust pipe
|
-
|
R
a
|
Relative
humidity of the intake air
|
%
|
R
f
|
FID response
factor
|
-
|
R
fM
|
FID
response factor for methanol
|
-
|
S
|
Dynamometer
setting
|
kW
|
T
a
|
Absolute
temperature of the intake air
|
K
|
T
Dd
|
Absolute
dewpoint temperature
|
K
|
T
SC
|
Temperature
of the intercooled air
|
K
|
T
ref.
|
Reference
temperature (of combustion air: 298 K)
|
K
|
T
SCRef
|
Intercooled
air reference temperature
|
K
|
V
AIRD
|
Intake air
volume flow rate on dry basis
|
m3/h
|
V
AIRW
|
Intake air
volume flow rate on wet basis
|
m3/h
|
V
EXHD
|
Exhaust gas
volume flow rate on dry basis
|
m3/h
|
V
EXHW
|
Exhaust gas
volume flow rate on wet basis
|
m3/h
|
W
F
|
Weighting
factor
|
-
|