Mine Climate — Condensation (Fog) Risk
Condensation (Fog) Risk for deep and hot mine planning.
Underground fog isn't weather — it's warm humid return air meeting cooler rock, usually where airflow direction changed seasonally. Beyond visibility, the condensate corrodes roof support and turns roadways greasy; ventilation planners chase it with this dew-point check at every seasonal swap.
Formula
Note: Mine ventilation is statutory and life-safety territory: airflow quantities, gas limits and re-entry times must be set by the registered ventilation engineer/manager under your jurisdiction's mining regulations — this calculator is a planning and training aid.
Condensation (Fog) Risk for deep and hot mine planning. A free mine ventilation & air quality tool — no sign-up, no upload, instant results in your browser.
About Mine Climate — Condensation (Fog) Risk
Mine Climate — Condensation (Fog) Risk computes the governing relationship Magnus dew point; condensation when T_surface ≤ T_dew live as you type. Underground fog isn't weather — it's warm humid return air meeting cooler rock, usually where airflow direction changed seasonally. Beyond visibility, the condensate corrodes roof support and turns roadways greasy; ventilation planners chase it with this dew-point check at every seasonal swap. Defaults are pre-filled with realistic values for this exact scenario, and the worked example substitutes your numbers step by step so the math is never a black box.
How to use Mine Climate — Condensation (Fog) Risk
- 1Enter your values — Air dry-bulb, Relative humidity, Rock/duct surface temp (sensible defaults are pre-filled).
- 2Read the live results: Dew point.
- 3Check the "with your numbers" line to see Magnus dew point; condensation when T_surface ≤ T_dew substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Mine Climate — Condensation (Fog) Risk?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula Magnus dew point; condensation when T_surface ≤ T_dew with authoritative sources cited on the page (McPherson, M.J., Subsurface Ventilation and Environmental Engineering; Hartman et al., Mine Ventilation and Air Conditioning, 3rd ed.)
- ✓Underground fog isn't weather — it's warm humid return air meeting cooler rock, usually where airflow direction changed seasonally.
- ✓SI ⇄ Imperial toggle converts your inputs in place, so you can work in the units your drawings use
Frequently asked questions
What formula does the mine climate — condensation (fog) risk use?+
It evaluates Magnus dew point; condensation when T_surface ≤ T_dew, exactly as published. Sources: McPherson, M.J., Subsurface Ventilation and Environmental Engineering; Hartman et al., Mine Ventilation and Air Conditioning, 3rd ed.. The substituted worked example on the page lets you verify every step against the textbook.
How should I read the result — and how far can I trust it?+
Underground fog isn't weather — it's warm humid return air meeting cooler rock, usually where airflow direction changed seasonally. Mine ventilation is statutory and life-safety territory: airflow quantities, gas limits and re-entry times must be set by the registered ventilation engineer/manager under your jurisdiction's mining regulations — this calculator is a planning and training aid.
When is this calculator the right tool for the job?+
Condensation (Fog) Risk for deep and hot mine planning. A free mine ventilation & air quality tool. Beyond visibility, the condensate corrodes roof support and turns roadways greasy; ventilation planners chase it with this dew-point check at every seasonal swap. For neighbouring scenarios, the related tools below cover the same engine with different presets.
Does it support both metric and imperial units?+
Yes — the SI ⇄ Imperial toggle converts the values already in the fields, preserving the physical quantity, so you can flip mid-calculation without re-entering anything.
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