# Title 40

## PART 90 APPENDIX A

## Appendix A to Subpart D of Part 90 - Tables

### 40:22.0.1.1.4.4.1.30.9 : Appendix A

Appendix A to Subpart D of Part 90 - TablesTable 1 - Symbols Used in Subpart D

Symbol | Term | Unit |
---|---|---|

CO | Carbon monoxide | |

CO2 | Carbon dioxide | |

NO | Nitric oxide | |

NO2 | Nitrogen dioxide | |

NOX | Oxides of nitrogen | |

O2 | Oxygen | |

conc | Concentration (ppm by volume) | ppm |

f | Engine specific parameter considering atmospheric conditions | |

FFCB | Fuel specific factor for the carbon balance calculation | |

FFD | Fuel specific factor for exhaust flow calculation on dry basis | |

FFH | Fuel specific factor representing the hydrogen to carbon ratio | |

FFW | Fuel specific factor for exhaust flow calculation on wet basis | |

GAIRW | Intake air mass flow rate on wet basis | kg/h |

GAIRD | Intake air mass flow rate on dry basis | kg/h |

GEXHW | Exhaust gas mass flow rate on wet basis | kg/h |

GFuel | Fuel mass flow rate | kg/h |

H | Absolute humidity (water content related to dry air) | gr/kg |

i | Subscript denoting an individual mode | |

KH | Humidity correction factor | |

L | Percent torque related to maximum torque for the test mode | percent |

mass | Pollutant mass flow | g/h |

nd, i | Engine speed (average at the i'th mode during the cycle) | 1/min |

Ps | Dry atmospheric pressure | kPa |

Pd | Test ambient saturation vapor pressure at ambient temperature | kPa |

P | Gross power output uncorrected | kW |

PAUX | Declared total power absorbed by auxiliaries fitted for the test | kW |

PM | Maximum power measured at the test speed under test conditions | kW |

Pi | Pi = PM, i + PAUX, i | |

PB | Total barometric pressure (average of the pre-test and post-test values) | kPa |

Ra | Relative humidity of the ambient air | percent |

T | Absolute temperature at air inlet | C |

Tbe | Air temperature after the charge air cooler (if applicable) (average) | C |

Tclout | Coolant temperature outlet (average) | C |

TDd | Absolute dew point temperature | C |

Td, i | Torque (average at the i'th mode during the cycle) | N-m |

TSC | Temperature of the intercooled air | C |

Tref | Reference temperature | C |

VEXHD | Exhaust gas volume flow rate on dry basis | m ^{3}/h |

VAIRW | Intake air volume flow rate on wet basis | m ^{3}/h |

PB | Total barometric pressure | kPa |

VEXHW | Exhaust gas volume flow rate on wet basis | m ^{3}/h |

WF | Weighing factor | |

WFE | Effective weighing factor |