For option: Upstream Density Calculation Method - Isentropic Exponent

The isentropic method as shown below is used to calculate the upstream density.

When 'Downstream' is selected differential pressure(Δp) is used. When 'Recovery Point' is selected permanent pressure loss(Δω) is used.

Symbol | Description | Units |
---|---|---|

ρ_{1} |
Upstream density | kg/m^{3} |

ρ | Downstream/recovery point density | kg/m^{3} |

P_{1} |
Upstream pressure | bar a |

Δω | Permanent pressure loss | bar a |

Δp | Differential pressure | bar a |

k | Isentropic exponent | - |

For option: Upstream Density Calculation Method - Isenthalpic

The isenthalpic method as shown below is used to calculate the upstream density.

When 'Downstream' is selected differential pressure(Δp) is used. When 'Recovery Point' is selected permanent pressure loss(Δω) is used.

Symbol | Description | Units |
---|---|---|

ρ_{1} |
Upstream density | kg/m^{3} |

ρ | Downstream/recovery point density | kg/m^{3} |

P_{1} |
Upstream pressure | bar a |

T | Temperature at the point of measured density | Kelvin |

T_{1} |
Upstream Temperature | Kelvin |

Z | Compressibility at the point of measured density | - |

Z_{1} |
Upstream compressibility | - |

Δω | Permanent pressure loss | bar a |

Δp | Differential pressure | bar a |