LNG Liquid Meter Energy Calculation
The Liquid Meter Energy Calculation window is used to calculate the energy of the liquid using the volume of the mixture.
Inputs
The inputs for an LNG Liquid Energy Calculation are:
| Input | Description |
|---|---|
| Component Mole Fraction | A DataTable attribute. |
| Volume | An Attribute with any Volume UOM. |
| Density | An Attribute with any Density UOM. |
| Heating Value | A column from the Component Table with any Volumetric Energy UOM. |
| Component Density | A column from the Component Table with any Density UOM. |
| Molecular Weight | A Column from the Component Table with any Molecular Weight UOM. |
Calculations
The calculations are performed using the following formula:
Example
The following is an example of the calculations included in the Liquid Meter Energy Calculation and the formulas used in those calculations to provide the resulting energy of the liquid based on the volume of the mixture.
- Using the 'Normalize' option of the component DR, Mole% is automatically converted to Normalized Mole% (N.Mole%).
- Calculate weight fraction using the formula:
- Calculate total mass and mass of each component:
- Volume = 82259 ft3 (Input)
- Density = 41.34 lb/ft3 (Input)
- Total mass = Volume * Density = 3,4000,588 lb
Calculate the mass of each component by multiplying total mass with weightfraction of each component:
Component Mass = Mi = Total Mass * WFi
Calculate Component volumes:
Component volume Vi = Component mass / Component Density = Mi / Di
Component N.Moles% Xin MWi WFi Comp. Mass Mi Comp. Density Di Comp. Volume Vi Methane 4.463E-4 16.04 1.12E-4 382.37 2.5 152.95 Ethane 1.055 30.06 4.97E-4 1693.44 2.9704 570.10 Propane 0.3279 44.09 0.227 772104.88 4.2285 182595.45 Iso-Butane 0.1473 58.12 0.134 457237.00 4.6925 97439.95 n-Butane 0.1738 58.12 0.158 539398.29 4.8706 110745.76 Iso-Pentane 0.0830 72.14 0.094 319905.17 5.212 61378.58 n-Petane 0.0651 72.14 0.073 251152.31 5.2584 47762.11 n-Hexane 0.0823 86.17 0.111 378750.75 5.5364 68411.01 n-Heptane 0.0711 100.20 0.111 380479.54 5.7379 66309.89 n-Octane 0.0391 114.22 0.070 238247.68 5.8907 40444.71 n-Nonane + 8.940E-3 128.25 0.018 61236.15 6.0215 10169.58 Finally, Total Energy is calculated as a sum of product of each component volume and respective heating value:
Component Energy Ei = Component Volume * Component Heating Value = Vi * Hi
Total Energy =
