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<8. Detailed Data Setting>
8-15
IM 11M12A01-04E 11th Edition : Jul. 19, 2017-00
Table 8.15 Parameter Codes for Average, Maximum and Minimum Values
Set item Parameter code Set range Units
Periods over which average values
are calculated
F11 1 to 255 Hours
Periods over which maximum
and minimum values are monitored
F12 1 to 255 Hours
n
Default Value
When the analyzer is delivered, or if data are initialized, periods over which average values
are calculated are set to one hour, and periods over which maximum and minimum values are
monitored are set to 24 hours.
8.6.3 Setting Fuels
n
Input Parameters
The analyzer calculates the moisture content contained in exhaust gases. The following sets
forth the fuel parameters necessary for calculation and their entries. The moisture quantity may
be mathematically expressed by:
Moisture quantity =
=
=
=
where,
Ao : Theoretical amount of air per unit quantity of fuel, m 3 /kg (or m 3 /m 3 ) ............ 2 in Table 8.16
G: Actual amount of exhaust gas (including water vapor) per unit quantity of fuel,
m 3 /kg (or m 3 /m 3 )
Gw : Water vapor contained in exhaust gas per unit quantity of fuel (by hydrogen
and moisture content in fuel), m 3 /kg (or m 3 /m 3 ) ............ 1 in Table 8.16
Gw1: Water vapor contained in exhaust gas per unit quantity of fuel (moisture content
in air), m 3 /kg (or m 3 /m 3 )
Go: Theoretical amount of dry exhaust gas per unit quantity of fuel, m 3 /kg (or m 3 /m 3 )
m: Air ratio
X : Fuel coefficient determined depending on low calorific power of fuel, m 3 /kg (or m 3 /m 3 ) ... 3 in Table 8.16
Z : Absolute humidity of the atmosphere, kg /kg ....... Figure 8.4
(water vapor caused by combustion and water vapor contained in the exhaust gas)
..
actual exhaust gas(including water vapor) per fuel
+ (water vapor contained in air for combustion)
x 100
Gw + (1.61 x Z x m x Ao)
Go + Gw + (m - 1) Ao + (1.61 x Z x m x Ao)
x 100
Gw + (1.61 x Z x m x Ao )
X + Ao x m
x 100
Gw + Gw
1
G
x 100
..... Equation 1
............ Equation 2
Fill in the boxes with fuel parameters in Equation 2 above to calculate the moisture content. Use
Ao, Gw and X shown in Table 8.16. If there are no appropriate fuel data in Table 8.16, use the
following equations for calculation.
Find the value of “Z” in Equations 1 and 2 using Japanese Standard JIS B 8222. If a precise
measurement is not required, obtain the value of “Z” using a graph for the absolute humidity
indicated by a dry and wet bulb hygrometer.