Source: https://www.law.cornell.edu/cfr/text/40/86.544-90
Timestamp: 2017-04-25 05:08:37
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40 CFR 86.544-90 - Calculations; exhaust emissions. | US Law | LII / Legal Information Institute
CFR › Title 40 › Chapter I › Subchapter C › Part 86 › Subpart F › Section 86.544-90 40 CFR 86.544-90 - Calculations; exhaust emissions.
§ 86. 544-90 Calculations; exhaust emissions.
This section describes how to calculate exhaust emissions. Determine emission results for each pollutant to at least one more decimal place than the applicable standard. Apply the deterioration factor, then round the adjusted figure to the same number of decimal places as the emission standard. Compare the rounded emission levels to the emission standard for each emission data vehicle. In the case of NOX HC standards, apply the deterioration factor to each pollutant and then add the results before rounding.
(a) Calculate a composite FTP emission result using the following equation:
Ywm = Weighted mass emissions of each pollutant (i.e., CO2, HC, CO, or NOX) in grams per vehicle kilometer and if appropriate, the weighted carbon mass equivalent of total hydrocarbon equivalent, in grams per vehicle kilometer.
Yct = Mass emissions as calculated from the transient phase of the cold-start test, in grams per test phase.
Ys = Mass emissions as calculated from the stabilized phase of the cold-start test, in grams per test phase.
Dct = The measured driving distance from the transient phase of the cold-start test, in kilometers.
Ds = The measured driving distance from the stabilized phase of the cold-start test, in kilometers.
Yht = Mass emissions as calculated from the transient phase of the hot-start test, in grams per test phase.
Dht = The measured driving distance from the transient phase of the hot-start test, in kilometers.
(b) The mass of each pollutant for each phase of both the cold-start test and the hot-start test is determined from the following:
(1) Hydrocarbon mass:
HCmass = Vmix × DensityHC × (HCconc/1,000,000)
(2) Oxides of nitrogen mass:
NOxmass = Vmix × DensityNO2 × KH × (NOxconc/1,000,000)
(3) Carbon monoxide mass:
COmass = Vmix × DensityCO × (COconc/1,000,000)
(4) Carbon dioxide mass:
CO2mass = Vmix × DensityCO2 × (CO2conc/100)
(5) Methanol mass:
CH3OHmass = Vmix × DensityCH3OH × (CH3OHconc/1,000,000)
(6) Formaldehyde mass:
HCHOmass = Vmix × DensityHCHO × (HCHOconc/1,000,000)
(7) Total hydrocarbon equivalent:
(i) THCE = HCmass 13.8756/32.042 × (CH3OH)mass 13.8756/30.0262 × (HCHO)mass
(8) Nitrous Oxide Mass: Vmix × DensityN2O × (N2Oconc/1,000,000)
(c) Meaning of symbols:
(i) HCmass = Hydrocarbon emissions, in grams per test phase.
(ii) DensityHC = Density of HC in exhaust gas.
(A)For gasoline-fuel; DensityHC = 576.8 g/m
3-carbon atom (16.33 g/ft
3-carbon atom), assuming an average carbon to hydrogen ratio of 1:1.85, at 20 °C (68 °F) and 101.3 kPa (760 mm Hg) pressure.
(B)For natural gas and liquefied petroleum gas-fuel; DensityHC = 41.57(12.011 H/C(1.008)) g/m
3-carbon atom (1.1771(12.011 H/C(1.008)) g/ft
3-carbon atom) where H/C is the hydrogen to carbon ratio of the hydrocarbon components of test fuel, at 20 °C (68 °F) and 101.3 kPa (760mm Hg) pressure.
(A) HCconc = Hydrocarbon concentration of the dilute exhaust sample corrected for background, in ppm carbon equivalent, i.e., equivalent propane × 3.
(B) HCconc = HCe − HCd(1 − (1/DF))
(A) HCe = Hydrocarbon concentrations of the dilute exhaust sample as measured, in ppm carbon equivalent (propane ppm × 3).
(B) HCe = FIDHCe − (r)CCH3OHe
(v) FID HCe = Concentration of hydrocarbon (plus methanol if methanol-fueled motorcycle is tested) in dilute exhaust as measured by the FID ppm carbon equivalent.
(vi) r = FID response to methanol.
(vii) CCH30He = Concentration of methanol in dilute exhaust as determined from the dilute exhaust methanol sample, ppm carbon.
(A) HCd = Hydrocarbon concentration of the dilution air as measured, ppm carbon equivalent.
(B) HCd = FID HCd − (r)CCH30Hd
(ix) FID HCd = Concentration of hydrocarbon (plus methanol if methanol-fueled motorcycle is tested) in dilution air as measured by the FID, ppm carbon equivalent.
(x) CCH3OHd = Concentration of methanol in dilution air as determined from dilution air methanol sample, ppm carbon.
(i) NOxmass = Oxides of nitrogen emissions, grams per test phase.
(ii) DensityN02 = Density of oxides of nitrogen in the exhaust gas, assuming they are in the form of nitrogen dioxide, 1913 g/m
3 (54.16 g/ft
3), at 20 °C (68 °F) and 101.3 kPa (760 mm Hg) pressure.
(A) NOxconc = Oxides of nitrogen concentration of the dilute exhaust sample corrected for background, ppm.
(B) NOxconc = NOxe − NOxd(1 − (1/DF))
(iv) NOxe = Oxides of nitrogen concentration of the dilute exhaust sample as measured, ppm.
(v) NOxd = Oxides of nitrogen concentration of the dilution air as measured, ppm.
(i) COmass = Carbon monoxide emissions, in grams per test phase.
(ii) DensityCO = Density of carbon monoxide, 1164 g/m
3 (32.97 g/ft
(A) COconc = Carbon monoxide concentration of the dilute exhaust sample corrected for background, water vapor, and CO2 extraction, ppm.
(B) COconc = COe − COd(1 − (1/DF))
(A) COe = Carbon monoxide concentration of the dilute exhaust sample volume corrected for water vapor and carbon dioxide extraction, in ppm.
(B) COe = (1 − 0.01925CO2e − 0.000323R)COem for gasoline-fueled vehicles with hydrogen to carbon ratio of 1.85:1
(C) COe = [1 − (0.01 0.005HCR) CO2e − 0.000323R]COem for methanol-fueled, natural gas-fueled or liquefied petroleum gas-fueled motorcycles, where HCR is hydrogen to carbon ratio as measured for the fuel used.
(v) COem = Carbon monoxide concentration of the dilute exhaust sample as measured, ppm
(vi) CO2e = Carbon dioxide concentration of the dilute exhaust sample, pct.
(vii) R = Relative humidity of the dilution air, pct (see § 86.542(n)).
(A) COd = Carbon monoxide concentration of the dilution air corrected for water vapor extraction, ppm.
(B) COd = (1 − 0.000323R)COdm
(ix) COdm = Carbon monoxide concentration of the dilution air sample as measured, ppm.
If a CO instrument which meets the criteria specified in § 86.511 is used and the conditioning column has been deleted, COem can be substituted directly for COe and COdm must be substituted directly for COd.
(i) CO2mass = Carbon dioxide emissions, grams per test phase.
(ii) DensityC02 = Density of carbon dioxide, 1830 g/m
3 (51.81 g/ft
(A) CO2conc = carbon dioxide concentration of the dilute exhaust sample corrected for background, in percent.
(B) CO2conc = CO2e − CO2d(1 − 1/DF)
(iv) CO2d = Carbon dioxide concentration of the dilution air as measured, in percent.
(i) CH3OHmass = Methanol emissions corrected for background, grams per test phase.
(ii) DensityCH3OH = Density of methanol is 1332 g/m
3 (37.71 g/ft
(A) CH3OHconc = Methanol concentration of the dilute exhaust corrected for background, ppm.
(B) CH3OHconc = CCH3OHe − CCH3OHd(1 − (1/DF))
(A) CCH3OHe = Methanol concentration in the dilute exhaust, ppm.
(A) CCH3OHd = Methanol concentration in the dilution air, ppm.
(vi) TEM = Temperature of methanol sample withdrawn from dilute exhaust, °R.
(vii) TDM = Temperature of methanol sample withdrawn from dilution air, °R.
(viii) PB = Barometric pressure during test, mm Hg.
(ix) VEM = Volume of methanol sample withdrawn from dilute exhaust, ft
(x) VDM = Volume of methanol sample withdrawn from dilution air, ft
(xi) Cs = GC concentration of sample drawn from dilute exhaust, µg/ml.
(xii) CD = GC concentration of sample drawn from dilution air, µg/ml.
(xiii) AVs = Volume of absorbing reagent (deionized water) in impinger through which methanol sample from dilute exhaust is drawn, ml.
(xiv) AVD = Volume of absorbing reagent (deionized water) in impinger through which methanol sample from dilution air is drawn, ml.
(xv) 1 = first impinger.
(xvi) 2 = second impinger.
(i) HCHOmass = Formaldehyde emissions corrected for background, grams per test phase.
(ii) DensityHCHO = Density of formaldehyde is 1249 g/m
3 (35.36 g/ft
(A) HCHOconc = Formaldehyde concentration of the dilute exhaust corrected for background, ppm.
(B) HCHOconc = CHCHOe − CHCHOd (1 − (1/DF))
(A) CHCHOe = Formaldehyde concentration in dilute exhaust, ppm.
(A) CHCHOd = Formaldehyde concentration in dilution air, ppm.
(vi) CFDE = Concentration of DNPH derivative of formaldehyde from dilute exhaust sample in sampling solution, µg/ml.
(vii) VAE = Volume of sampling solution for dilute exhaust formaldehyde sample, ml.
(A) Q = Ratio of molecular weights of formaldehyde to its DNPH derivative.
(B) Q = 0.1429
(ix) TEF = Temperature of formaldehyde sample withdrawn from dilute exhaust, °R.
(x) VSE = Volume of formaldehyde sample withdrawn from dilute exhaust, ft
(xi) PB = Barometric pressure during test, mm Hg.
(xii) CFDA = Concentration of DNPH derivative of formaldehyde from dilution air sample in sampling solution, µg/ml.
(xiii) VAA = Volume of sampling solution for dilution air formaldehyde sample, ml.
(xiv) TDF = Temperature of formaldehyde sample withdrawn from dilution air, °R.
(xv) VSA = Volume of formaldehyde sample withdrawn from dilution air, ft
(i) DF = 13.4/[CO2e (HCe = COe)10−4] for gasoline-fueled vehicles.
(ii) For methanol-fueled, natural gas-fueled or liquefied petroleum gas-fueled motorcycles, where fuel composition is Cx Hy Oz as measured, or calculated, for the fuel used (for natural gas and liquefied petroleum gas-fuel, Z = 0):
(A) Vmix = Total dilute exhaust volume in cubic meters per test phase corrected to standard conditions (293 °K (528 °R) and 101.3 kPa (760 mm Hg)).
(iv) Vo = Volume of gas pumped by the positive displacement pump, in cubic meters per revolution. This volume is dependent on the pressure differential across the positive displacement pump. (See calibration techniques in § 86.519.)
(v) N = Number of revolutions of the positive displacement pump during the test phase while samples are being collected.
(vi) PB = Barometric pressure, kPa.
(vii) Pi = Pressure depression below atmospheric measured at the inlet to the positive displacement pump, kPa.
(viii) Tp = Average temperature of dilute exhaust entering positive displacement pump during test while samples are being collected, °K.
(A) Kh = Humidity correction factor.
(B) Kh = 1/[1 − 0.0329(H − 10.71)]
(A) H = Absolute humidity in grams of water per kilogram of dry air.
(B) H = [(6.211)Ra × Pd]/[PB − (Pd × Ra/100)]
(xi) Ra = Relative humidity of the ambient air, pct.
(xii) Pd = Saturated vapor pressure, in kPa at the ambient dry bulb temperature.
(xiii) PB = Barometric pressure, kPa.
(i) N2Omass = Nitrous oxide emissions, in grams per test phase.
(ii) Density N2O = Density of nitrous oxide is 51.81 g/ft
3 (1.83 kg/m
3), at 68 °F (20 °C) and 760 mm Hg (101.3kPa) pressure.
(A) N2Oconc = Nitrous oxide concentration of the dilute exhaust sample corrected for background, in ppm.
(B) N2Oconc = N2Oe-N2Od(1−(1/DF)).
(d) Sample calculation of mass emission values for gasoline-fueled vehicles with engine displacements equal to or greater than 170 cc (10.4 cu. in.):
(1) For the “transient” phase of the cold-start test, assume Vo = 0.0077934 m
3 per rev; N = 12,115; R = 20.5 pct; Ra = 20.5 pct; PB = 99.05 kPa; Pd = 3.382 kPa; Pi = 9.851 kPa; Tp = 309.8 °K; HCe = 249.75 ppm carbon equivalent; NOxe = 38.30 ppm; COem = 311.23 ppm; CO2e = 0.415 percent; HCd = 4.90 ppm; NOxd = 0.30 ppm; COdm = 8.13 ppm; CO2d = 0.037 pct; Dct = 5.650 km.
(i) Vmix = [(0.0077934)(12,115)(99.05-9.851)(293.15)]/ [(101.325)(309.8)] = 78.651 m
3 per test phase.
(ii) H = [(6.211)(20.5)(3.382)]/[(99.05) − (3.382)(20.5/100)] = 4.378 grams H2O per kg dry air.
(iii) Kh = 1/[1 − 0.0329(4.378 − 10.71)] = 0 8276
(iv) COe = [1 − 0.01925(0.415) − 0.000323 (20.5)](311.23) = 306.68 ppm.
(v) COd = [1 − 0.000323(20.5)](8.13) = 8.08 ppm.
(vi) DF = 13.4/[0.415 (249.75 306.68)10−4] = 28.472
(vii) HCconc = 249.75 − 4.90(1 − 1/28.472) = 245.02 ppm.
(viii) HCmass = (78.651) (576.8) (245.02) 10−6 = 11.114 grams per test phase.
(ix) NOxconc = 38.30 − 0.30(1 − 1/28.472) = 38.01 ppm.
(x) NOxmass = (78.651)(1913)(38.01)(0.8276) × 10−6 = 4.733 grams per test phase.
(xi) COconc = 306.68 − 8.08 (1 − 1/28.472) = 298.88 ppm.
(xii) COmass = (78.651) (1164) (298.88) (10−6) = 27.362 grams per test phase.
(xiii) CO2conc = 0.415 − 0.037 (1 − 1/28.472) = 0.3793 percent.
(xiv) CO2mass = (78.651)(1843)(0.3793)/100 = 549.81 grams per test phase.
(2) For the “stabilized” portion of the cold-start test, assume that similar calculations resulted in HCmass = 7.184 grams per test phase; NOxmass = 2.154 grams per test phase; COmass = 64.541 grams per test phase; and CO2mass = 529.52 grams per test phase. Ds = 6.070 km.
(3) For the “transient” portion of the hot-start test, assume that similar calculations resulted in HCmass = 6.122 grams per test phase; NOxmass = 7.056 grams per test phase; COmass = 34.964 grams per test phase; and CO2mass = 480.93 grams per test phase. Dht = 5.660 km.
(4) For a 1978 motorcycle with an engine displacement equal to or greater than 170 cc (10.4 cu. in):
(i) HCwm = 0.43 [(11.114 7.184)/(5.650 6.070)] 0.57 [(6.122 7.184)/(5.660 6.070)] = 1.318 grams per vehicle kilometer.
(ii) NOxwm = 0.43 [(4.733 = 2.154)/(5.650 = 6.070)] = 0.57 [(7.056 = 2.154)/(5.660 = 6.070)] = 0.700 gram per vehicle kilometer.
(iii) COwm = 0.43 [(27.362 64.541)/(5.650 6.070)] 0.57 [(34.964 64.541)/(5.660 6.070)] = 8.207 grams per vehicle kilometer.
(iv) CO2wm = 0.43 [(549.81 529.52)/(5.650 6.070)] 0.57 [(480.93 529.52)/(5.660 6.070)] = 88.701 grams per vehicle kilometer.
[ 54 FR 14553, Apr. 11, 1989, as amended at 59 FR 48515, Sept. 21, 1994; 60 FR 34358, June 30, 1995; 69 FR 2441, Jan. 15, 2004; 76 FR 57377, Sept. 15, 2011; 81 FR 73980, Oct. 25, 2016] This is a list of United States Code sections, Statutes at Large, Public Laws, and Presidential Documents, which provide rulemaking authority for this CFR Part.This list is taken from the Parallel Table of Authorities and Rules provided by GPO [Government Printing Office].It is not guaranteed to be accurate or up-to-date, though we do refresh the database weekly. More limitations on accuracy are described at the GPO site.United States CodeU.S. Code: Title 42 - THE PUBLIC HEALTH AND WELFARE§ 7401 - Congressional findings and declaration of purpose§ 7402 - Cooperative activities§ 7403 - Research, investigation, training, and other activities§ 7404 - Research relating to fuels and vehicles§ 7405 - Grants for support of air pollution planning and control programs§ 7406 - Interstate air quality agencies; program cost limitations§ 7407 - Air quality control regions§ 7408 - Air quality criteria and control techniques§ 7409 - National primary and secondary ambient air quality standards§ 7410 - State implementation plans for national primary and secondary ambient air quality standards§ 7411 - Standards of performance for new stationary sources§ 7412 - Hazardous air pollutants§ 7413 - Federal enforcement§ 7414 - Recordkeeping, inspections, monitoring, and entry§ 7415 - International air pollution§ 7416 - Retention of State authority§ 7417 - Advisory committees§ 7418 - Control of pollution from Federal facilities§ 7419 - Primary nonferrous smelter orders§ 7420 - Noncompliance penalty§ 7421 - Consultation§ 7422 - Listing of certain unregulated pollutants§ 7423 - Stack heights§ 7424 - Assurance of adequacy of State plans§ 7425 - Measures to prevent economic disruption or unemployment§ 7426 - Interstate pollution abatement§ 7427 - Public notification§ 7428 - State boards§ 7429 - Solid waste combustion§ 7430 - Emission factors§ 7431 - Land use authority§ 7450 to 7459 - Repealed. Pub. L. 101–549, title VI, § 601, Nov. 15, 1990, 104 Stat. 2648§ 7470 - Congressional declaration of purpose§ 7471 - Plan requirements§ 7472 - Initial classifications§ 7473 - Increments and ceilings§ 7474 - Area redesignation§ 7475 - Preconstruction requirements§ 7476 - Other pollutants§ 7477 - Enforcement§ 7478 - Period before plan approval§ 7479 - Definitions§ 7491 - Visibility protection for Federal class I areas§ 7492 - Visibility§ 7501 - Definitions§ 7502 - Nonattainment plan provisions in general§ 7503 - Permit requirements§ 7504 - Planning procedures§ 7505 - Environmental Protection Agency grants§ 7505a - Maintenance plans§ 7506 - Limitations on certain Federal assistance§ 7506a - Interstate transport commissions§ 7507 - New motor vehicle emission standards in nonattainment areas§ 7508 - Guidance documents§ 7509 - Sanctions and consequences of failure to attain§ 7509a - International border areas§ 7511 - Classifications and attainment dates§ 7511a - Plan submissions and requirements§ 7511b - Federal ozone measures§ 7511c - Control of interstate ozone air pollution§ 7511d - Enforcement for Severe and Extreme ozone nonattainment areas for failure to attain§ 7511e - Transitional areas§ 7511f - NOx and VOC study§ 7512 - Classification and attainment dates§ 7512a - Plan submissions and requirements§ 7513 - Classifications and attainment dates§ 7513a - Plan provisions and schedules for plan submissions§ 7513b - Issuance of RACM and BACM guidance§ 7514 - Plan submission deadlines§ 7514a - Attainment dates§ 7515 - General savings clause§ 7521 - Emission standards for new motor vehicles or new motor vehicle engines§ 7522 - Prohibited acts§ 7523 - Actions to restrain violations§ 7524 - Civil penalties§ 7525 - Motor vehicle and motor vehicle engine compliance testing and certification§ 7541 - Compliance by vehicles and engines in actual use§ 7542 - Information collection§ 7543 - State standards§ 7544 - State grants§ 7545 - Regulation of fuels§ 7546 - Renewable fuel§ 7547 - Nonroad engines and vehicles§ 7548 - Study of particulate emissions from motor vehicles§ 7549 - High altitude performance adjustments§ 7550 - Definitions§ 7551 - Omitted§ 7552 - Motor vehicle compliance program fees§ 7553 - Prohibition on production of engines requiring leaded gasoline§ 7554 - Urban bus standards§ 7571 - Establishment of standards§ 7572 - Enforcement of standards§ 7573 - State standards and controls§ 7574 - Definitions§ 7581 - Definitions§ 7582 - Requirements applicable to clean-fuel vehicles§ 7583 - Standards for light-duty clean-fuel vehicles§ 7584 - Administration and enforcement as per California standards§ 7585 - Standards for heavy-duty clean-fuel vehicles (GVWR above 8,500 up to 26,000 lbs.)§ 7586 - Centrally fueled fleets§ 7587 - Vehicle conversions§ 7588 - Federal agency fleets§ 7589 - California pilot test program§ 7590 - General provisions§ 7601 - Administration§ 7602 - Definitions§ 7603 - Emergency powers§ 7604 - Citizen suits§ 7605 - Representation in litigation§ 7606 - Federal procurement§ 7607 - Administrative proceedings and judicial review§ 7608 - Mandatory licensing§ 7609 - Policy review§ 7610 - Other authority§ 7611 - Records and audit§ 7612 - Economic impact analyses§ 7613 - Repealed. Pub. L. 101–549, title VIII, § 803, Nov. 15, 1990, 104 Stat. 2689§ 7614 - Labor standards§ 7615 - Separability§ 7616 - Sewage treatment grants§ 7617 - Economic impact assessment§ 7618 - Repealed. Pub. L. 101–549, title I, § 108(q), Nov. 15, 1990, 104 Stat. 2469§ 7619 - Air quality monitoring§ 7620 - Standardized air quality modeling§ 7621 - Employment effects§ 7622 - Employee protection§ 7623 - Repealed. Pub. L. 96–300, § 1(c), July 2, 1980, 94 Stat. 831§ 7624 - Cost of vapor recovery equipment§ 7625 - Vapor recovery for small business marketers of petroleum products§ 7625-1§ 7625a - Statutory construction§ 7626 - Authorization of appropriations§ 7627 - Air pollution from Outer Continental Shelf activities§ 7628 - Demonstration grant program for local governments§ 7641 - Noise abatement§ 7642 - Authorization of appropriations§ 7651 - Findings and purposes§ 7651a - Definitions§ 7651b - Sulfur dioxide allowance program for existing and new units§ 7651c - Phase I sulfur dioxide requirements§ 7651d - Phase II sulfur dioxide requirements§ 7651e - Allowances for States with emissions rates at or below 0.80 lbs/mmBtu§ 7651f - Nitrogen oxides emission reduction program§ 7651g - Permits and compliance plans§ 7651h - Repowered sources§ 7651i - Election for additional sources§ 7651j - Excess emissions penalty§ 7651k - Monitoring, reporting, and recordkeeping requirements§ 7651l - General compliance with other provisions§ 7651m - Enforcement§ 7651n - Clean coal technology regulatory incentives§ 7651o - Contingency guarantee, auctions, reserve§ 7661 - Definitions§ 7661a - Permit programs§ 7661b - Permit applications§ 7661c - Permit requirements and conditions§ 7661d - Notification to Administrator and contiguous States§ 7661e - Other authorities§ 7661f - Small business stationary source technical and environmental compliance assistance program§ 7671 - Definitions§ 7671a - Listing of class I and class II substances§ 7671b - Monitoring and reporting requirements§ 7671c - Phase-out of production and consumption of class I substances§ 7671d - Phase-out of production and consumption of class II substances§ 7671e - Accelerated schedule§ 7671f - Exchange authority§ 7671g - National recycling and emission reduction program§ 7671h - Servicing of motor vehicle air conditioners§ 7671i - Nonessential products containing chlorofluorocarbons§ 7671j - Labeling§ 7671k - Safe alternatives policy§ 7671l - Federal procurement§ 7671m - Relationship to other laws§ 7671n - Authority of Administrator§ 7671o - Transfers among Parties to Montreal Protocol§ 7671p - International cooperation§ 7671q - Miscellaneous provisions