Soil Resistivity

Reference data and engineering information about soil resistivity for combustion applications.

soilresistivity

Overview

Engineering reference data for Soil Resistivity in combustion engineering.

Key Formulas

Heat Release

$Q = \dot{m} \cdot HV$

Fuel energy release rate.

Air-Fuel Ratio

$AF = \frac{m_{air}}{m_{fuel}}$

Mass of air per mass of fuel.

Excess Air

$EA = \frac{O_2}{21 - O_2} \times 100\%$

From flue gas oxygen measurement.

Variables

Symbol	Description	Unit
$Q$	Heat release rate	W
$\dot{m}$	Mass flow rate	kg/s
$HV$	Heating value	J/kg
$AF$	Air-fuel ratio	—

Soil Resistivity Values

The electrical resistivity of soil varies significantly depending on soil type, moisture content, and composition. Below is a reference table of typical resistivity values for common soil types.

19 rows

Typical soil resistivity values for earth electrode system design
Soil Type	Mean Resistivity(Ω·m)
Clay, compacted	100 - 200
Clay, soft	50
Clayely sand	50 - 500
Humus, leaf mold	10 - 150
Granite	1500 - 10000
Granite, modified	100 - 600
Jurassic marl	30 - 40
Limestone, fissured	500 - 1000
Marl	100 - 200
Mica schist	800
Peat, turf	5 - 100
Sandstone	1500 - 10000
Sandstone, modified	100 - 600
Shist, shale	50 - 300
Siliceous sand	200 - 300
Soil, chalky	100 - 300
Soil, swampy	1 - 30
Stony sub-soil, grass-covered	300 - 500
Stony ground	1500 - 3000

Source: engineeringtoolbox.com

References

Original Source

Source: engineeringtoolbox.com