TABLE 1 OF § 1065.655 - SYMBOLS AND SUBSCRIPTS FOR CHEMICAL BALANCE EQUATIONS
xdil/exh | Amount of dilution gas or excess air per mole of exhaust |
Xdil/exh | amount of dilution gas or excess air per mole of exhaust. |
xCcombdry | amount of carbon from fuel and any injected fluids in the exhaust per mole of dry exhaust |
xH2dry | amount of H2 in exhaust per amount of dry exhaust |
KH2Ogas | water-gas reaction equilibrium coefficient; you may use 3.5 or calculate your own value using good engineering judgment |
xH2Oexhdry | amount of H2 O in exhaust per dry mole of dry exhaust |
xprod/intdry | amount of dry stoichiometric products per dry mole of intake air |
xdil/exhdry | amount of dilution gas and/or excess air per mole of dry exhaust |
xint/exhdry | amount of intake air required to produce actual combustion products per mole of dry (raw or diluted) exhaust |
xraw/exhdry | amount of undiluted exhaust, without excess air, per mole of dry (raw or diluted) exhaust |
xO2int | amount of intake air O2 per mole of intake air |
xCO2intdry | amount of intake air CO2 per mole of dry intake air; you may use xCO2intdry = 375 [MICRO]mol/mol, but we recommend measuring the actual concentration in the intake air |
xH2Ointdry | amount of intake air H2 O per mole of dry intake air |
xCO2int | amount of intake air CO2 per mole of intake air |
xCO2dil | amount of dilution gas CO2 per mole of dilution gas |
xCO2dildry | amount of dilution gas CO2 per mole of dry dilution gas; if you use air as diluent, you may use xCO2dildry = 375 [MICRO]mol/mol, but we recommend measuring the actual concentration in the intake air |
xH2Odildry | amount of dilution gas H2 O per mole of dry dilution gas |
xH2Odil | amount of dilution gas H2 O per mole of dilution gas |
x[emission]meas | amount of measured emission in the sample at the respective gas analyzer |
x[emission]dry | amount of emission per dry mole of dry sample |
xH2O[emission]meas | amount of H2 O in sample at emission-detection location; measure or estimate these values according to § 1065.145(e)(2) |
xH2Oint | amount of H2 O in the intake air, based on a humidity measurement of intake air |
[ALPHA] | atomic hydrogen-to-carbon ratio of the fuel (or mixture of test fuels) and any injected fluids |
[BETA] | atomic oxygen-to-carbon ratio of the fuel (or mixture of test fuels) and any injected fluids |
[GAMMA] | atomic sulfur-to-carbon ratio of the fuel (or mixture of test fuels) and any injected fluids |
[DELTA] | atomic nitrogen-to-carbon ratio of the fuel (or mixture of test fuels) and any injected fluids |
[ALPHA] = 1.8
[BETA] = 0.05
[GAMMA] = 0.0003
[DELTA] = 0.0001
Where:
wC = carbon mass fraction of the fuel (or mixture of test fuels) and any injected fluids.
MC = molar mass of carbon.
[ALPHA] = atomic hydrogen-to-carbon ratio of the fuel (or mixture of test fuels) and any injected fluids.
MH = molar mass of hydrogen.
[BETA] = atomic oxygen-to-carbon ratio of the fuel (or mixture of test fuels) and any injected fluids.
MO = molar mass of oxygen.
[GAMMA] = atomic sulfur-to-carbon ratio of the fuel (or mixture of test fuels) and any injected fluids.
MS = molar mass of sulfur.
[DELTA] = atomic nitrogen-to-carbon ratio of the fuel (or mixture of test fuels) and any injected fluids.
MN = molar mass of nitrogen.
Example:
[ALPHA] = 1.8
[BETA] = 0.05
[GAMMA] = 0.0003
[DELTA] = 0.0001
MC = 12.0107
MH = 1.00794
MO = 15.9994
MS = 32.065
MN = 14.0067
wC = 0.8206
Eq. 1065.655-20
Eq. 1065.655-21
Eq. 1065.655-22
Eq. 1065.655-23
Where:
N = total number of fuels and injected fluids over the duty cycle.
j = an indexing variable that represents one fuel or injected fluid, starting with j = 1.
mj = the mass flow rate of the fuel or any injected fluid j. For applications using a single fuel and no DEF fluid, set this value to 1. For batch measurements, divide the total mass of fuel over the test interval duration to determine a mass rate.
wHmeasj = hydrogen mass fraction of fuel or any injected fluid j.
wCmeasj = carbon mass fraction of fuel or any injected fluid j.
wOmeasj = oxygen mass fraction of fuel or any injected fluid j.
wSmeasj = sulfur mass fraction of fuel or any injected fluid j.
wNmeasj = nitrogen mass fraction of fuel or any injected fluid j.
Example:
N = 1
j = 1
m1
wHmeas1
wCmeas1
wOmeas1
wSmeas1
wNmeas1
MC
MH
MO
MS
MN
Where:
nexh = raw exhaust molar flow rate from which you measured emissions.
nint = intake air molar flow rate including humidity in intake air.
Example:
nint = 3.780 mol/s
xint/exhdry = 0.69021 mol/mol
xraw/exhdry = 1.10764 mol/mol
xH20exhdry = 107.64 mmol/mol = 0.10764 mol/mol
Where:
nexh = raw exhaust molar flow rate from which you measured emissions.
j = an indexing variable that represents one fuel or injected fluid, starting with j = 1.
N = total number of fuels and injected fluids over the duty cycle.
mj = the mass flow rate of the fuel or any injected fluid j.
wCj = carbon mass fraction of the fuel and any injected fluid j.
Example:
N = 1
j = 1
m1
wC1
MC
xCcombdry1
xH20exhdry1
= 6.066 mol/s
Example:
nint = 7.930 mol/s
xraw/exhdry = 0.1544 mol/mol
xint/exhdry = 0.1451 mol/mol
xH20/exh = 32.46 mmol/mol = 0.03246 mol/mol
ndexh = 49.02 mol/s
nexh = (0.1544 - 0.1451) · (1 - 0.03246) · 49.02 + 7.930 = 0.4411 + 7.930 = 8.371 mol/s
40 C.F.R. §1065.655