40 C.F.R. § 86.143-96
Where:
MCH3OH = Methanol mass change, [MICRO]g.
Vn = Net enclosure volume, ft3, as determined by subtracting 50 ft3 (volume of vehicle with trunk and windows open) from the enclosure volume. A manufacturer may use the measured volume of the vehicle (instead of the nominal 50 ft3) with advance approval by the Administrator: Provided, the measured volume is determined and used for all vehicles tested by that manufacturer.
TE = Temperature of sample withdrawn, R.
f = Final sample.
CMS = GC concentration of sample, [MICRO]g/ml.
1 = First impinger.
AV = Volume of absorbing reagent in impinger.
2 = Second impinger.
VE = Volume of sample withdrawn, ft3. Sample volumes must be corrected for differences in temperature to be consistent with determination of Vn, prior to being used in the equation.
TSHED = Temperature of SHED, R.
i = Initial sample.
MCH3OH,out = mass of methanol exiting the enclosure, in the case of fixed-volume enclosures for diurnal emission testing, [MICRO]g.
MCH3OH,in = mass of methanol entering the enclosure, in the case of fixed-volume enclosures for diurnal emission testing, [MICRO]g.
Where,
(A) MHC = Hydrocarbon mass change, g.
(B) CHC = FID hydrocarbon concentration as ppm including FID response to methanol (or methane, as appropriate) in the sample.
(C) CCH3OH = Methanol concentration as ppm carbon.
(D) Vn = Net enclosure volume ft3 (m3) as determined by subtracting 50 ft3 (1.42 m3) (volume of vehicle with trunk and windows open) from the enclosure volume. A manufacturer may use the measured volume of the vehicle (instead of the nominal 50 ft3) with advance approval by the Administrator, provided the measured volume is determined and used for all vehicles tested by that manufacturer.
(E) r = FID response factor to methanol.
(F) PB = Barometric pressure, in Hg (Kpa).
(G) T = Enclosure temperature, °R(°K).
(H) i = initial reading.
(I) f = final reading.
(J) 1 = First impinger.
(K) 2 = Second impinger.
(L) Assuming a hydrogen to carbon ratio of 2.3:
(1) k = 2.97; and
(2) For SI units, k = 17.16.
(M) MHC, out = mass of hydrocarbons exiting the enclosure, in the case of fixed-volume enclosures for diurnal emission testing, g.
(N) MHC, in = mass of hydrocarbons entering the enclosure, in the case of fixed-volume enclosures for diurnal emission testing, g.
MCH3OH = [RHO]CH3OH Vmix *
(CCH3OH, rl-CCH3OH, d)
Where,
(A) MCH3OH = methanol mass change, [MICRO]g.
(B) [RHO]CH3,OH = 37.71 g/ft3, density of pure vapor at 68 °F.
(C) Vmix = total dilute sample volume, in ft3, calculated as appropriate for the collection technique used.
(D) CCH3OH, rl = methanol concentration of diluted running loss sample, in ppm carbon equivalent.
(E) CCH3OH, d = methanol concentration of dilution air, in ppm carbon equivalent.
MHC = [RHO]HC Vmix10-6 * (CHC, rl-CHC, d)
Where,
(A) MHC = hydrocarbon mass change, g.
(B) [RHO]HC = 16.88 g/ft3, density of pure vapor at 68 °F (for hydrogen to carbon ratio of 2.3).
(C) Vmix = total dilute sample volume, in ft3, calculated as appropriate for the collection technique used.
(D) CHC, rl = hydrocarbon concentration of diluted running loss sample, in ppm carbon equivalent.
(E) CHC, d = hydrocarbon concentration of dilution air, in ppm carbon equivalent.
Where:
mTHCE = the sum of the mass of THCE in the SHED.
mTHC = the mass of THC and all oxygenated hydrocarbons in the SHED, as measured by the FID. Calculate THC mass based on [RHO]THC.
rTHC = the effective C1-equivalent density of THC as specified in 40 CFR 1066.1005(f) .
mOHCi = the mass of oxygenated species i in the SHED.
rOHCi = the C1-equivalent density of oxygenated species i.
RFOHCi[THC-FID] = the response factor of a THC-FID to oxygenated species i relative to propane on a C1-equivalent basis as determined in 40 CFR 1065.845 .
40 C.F.R. §86.143-96