Wobbe Index

Overview

Engineering reference data for Wobbe Index in miscellaneous.

Key Formulas

Unit Conversion

$y = x \cdot k$

Multiply by conversion factor.

Linear Interpolation

$y = y_1 + \frac{(x - x_1)(y_2 - y_1)}{x_2 - x_1}$

Estimate between two known points.

Percentage

$p = \frac{\text{part}}{\text{whole}} \times 100\%$

Part as fraction of whole.

Variables

Symbol	Description	Unit
$x$	Input value	—
$y$	Output value	—
$k$	Conversion factor	—

Fuel Gas Wobbe Index Reference Table

Important Notes on Application

The Wobbe Index primarily indicates the interchangeability of fuel gases by comparing the energy output per unit volume of air used. It is a key metric for ensuring appliances or turbines can operate safely and efficiently when switching between gas sources of different compositions.

Critical Limitation: The Wobbe Index does not account for differences in flame temperature, heat transfer coefficients, or temperature gradients. It solely addresses volumetric energy flow and air requirement similarity.

Interactive Charts

References

• Original Source