§ 1065.615 - Bag sample calculations.

(a) Calculate the dilution factor. The dilution factor is the ratio of the total volume of the raw exhaust to the total volume of the diluted exhaust. It is calculated as 134,000 divided by the sum of the diluted ppmC concentrations of carbon-containing compounds in the exhaust, as follows:

DF = 134,000/(CO2sample+THCsample+COsample),

(b) Calculate mass emission rates (g/test) for the transient segment usingthe general equation in paragraph (b)(1) of this section:

(1) The general equation is:

Emission rate = (total dilute exhaust flow volume)(ppm)(density factor)/106 Mx = (Vmix)(Ci)(fdi)/106

(2) The equation to calculate Ci is:

Ci = Csample-Cbackground [1—(1/DF)]

(c) Calculate total brake work (kW-hr) done during the emissions sampling period of each segment or mode and then weight it by the applicable test cycle weighting factors.

(d) Calculate emissions in g/kW-hr by dividing the total weighted mass emission rate (g/test) by the total cycle-weighted brake work for the test.

(e) Apply deterioration factors or other adjustment factors to the brake-specific emission rate in paragraph (d) of this section, as specified in the standard-setting part.