Cord Fuel Wood

Overview

Engineering reference data for Cord Fuel Wood in material science and properties.

Key Formulas

Stress

$\sigma = \frac{F}{A}$

Force per unit area.

Strain

$\varepsilon = \frac{\Delta L}{L_0}$

Change in length per original length.

Hooke's Law

$\sigma = E \varepsilon$

Stress proportional to strain in elastic region.

Thermal Expansion

$\Delta L = \alpha L_0 \Delta T$

Length change due to temperature.

Variables

Symbol	Description	Unit
$\sigma$	Stress	Pa
$\varepsilon$	Strain	—
$E$	Young's modulus	Pa
$\alpha$	Thermal expansion coefficient	1/°C
$\Delta T$	Temperature change	°C

Firewood Types and Properties

When purchasing firewood, the type of wood affects burning performance and characteristics. The air space within a standard cord can constitute up to 40% of the total volume, leading to a net wood volume that typically ranges from 80 to 100 cubic feet per cord.

Cord Calculation Examples

To calculate the number of cords in a firewood pile, measure the length ($l$), width ($w$), and height ($h$), then compute the volume and divide by the appropriate cord volume.

Example 1 (Imperial Units): A pile is 12 ft long, 2.5 ft wide, and 6 ft high. $N = \frac{(12 \, \text{ft}) \times (2.5 \, \text{ft}) \times (6 \, \text{ft})}{128 \, \text{ft}^3} = 1.4 \, \text{cord}$

Example 2 (Metric Units): A pile is 6 m long, 1.2 m wide, and 1.5 m high. $N = \frac{(6 \, \text{m}) \times (1.2 \, \text{m}) \times (1.5 \, \text{m})}{3.62 \, \text{m}^3} = 3 \, \text{cord}$

References

• Original Source