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40 C.F.R. § 86.143-96

Calculations; evaporative emissions.

§ 86.143-96 Calculations; evaporative emissions.

(a) The following equations are used to calculate the evaporative emissions from gasoline- and methanol-fueled vehicles, and for gaseous-fueled vehicles.

(b) Use the measurements of initial and final concentrations to determine the mass of hydrocarbons and methanol emitted. For testing with pure gasoline, methanol emissions are assumed to be zero.

(1) For enclosure testing of diurnal, hot soak, and running loss emissions:

(i) Methanol emissions:

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Where: MCH3OH = Methanol mass change, µg. Vn = Net enclosure volume, ft , as determined by subtracting 50 ft (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 ft ) 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 TE = Temperature of sample withdrawn, R. f = Final sample.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, µg/ml. 1 = First impinger. AV = Volume of absorbing reagent in impinger. 2 = Second impinger. VE = Volume of sample withdrawn, ft . 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, µg. MCH3OH,in = mass of methanol entering the enclosure, in the case of fixed-volume enclosures for diurnal emission testing, µg.
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