Ventilation Air Velocity Calculator
Integrate signed actual velocity traverse cells and compare independent mine duct flow, not Q/A or steady contaminant dilution alone. Caller independently verifies units, applicability and matching conditions; no operational recipe, safety certification, causal efficacy or legal/resource classification is inferred.
Description
An air traverse integrates signed normal velocity across sampled duct cells.
An air traverse integrates signed normal velocity across sampled duct cells.1
Comparing that sum with an independent duct-flow record preserves measurement disagreement.
When to use Ventilation Air Velocity Calculator
Use this tool to calculate or review the supplied observations under the stated rules. Match completed survey or ledger observations by block, segment or stage and confirm their units and boundaries.
How to use Ventilation Air Velocity Calculator and understand its results
- Match completed survey or ledger observations by block, segment or stage and confirm their units and boundaries.
- Enter observedTraverseCellAreasM2, observedTraverseNormalSpeedsMSecond, observedIndependentDuctFlowM3Second, using the field meanings and rules below, then run the tool.
- Read areaIntegratedObservedVentilationM3Second, signedDuctFlowDiscrepancyM3Second. Inspect nested result fields where present, and review unknown records separately from known matches.
- Correct any reported input issue and run again. Before using a successful result, check the stated units, signs, reference scope and observation coverage.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| observedTraverseCellAreasM2 | Observed traverse cell areas m2 | list of number | Required |
| observedTraverseNormalSpeedsMSecond | Observed traverse normal speeds m second | list of number | Required |
| observedIndependentDuctFlowM3Second | Observed independent duct flow m3 second | number | Required |
Use aligned areas>0 and finite signed normal velocities. Sum area×velocity and subtract that integral from the independent finite signed duct flow. Reversing flow signs changes the integral; no absolute speed is substituted.
Q=ΣA_i v_i; discrepancy=independentQ−Q Use the matching field units and the exact boundary, ordering and reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| areaIntegratedObservedVentilationM3Second | Area integrated observed ventilation m3 second | number |
| signedDuctFlowDiscrepancyM3Second | Signed duct flow discrepancy m3 second; preserve the subtraction order and sign defined in the mechanics | number |
{
"input": {
"observedTraverseCellAreasM2": [
1,
2
],
"observedTraverseNormalSpeedsMSecond": [
2,
1
],
"observedIndependentDuctFlowM3Second": 5
},
"output": {
"areaIntegratedObservedVentilationM3Second": 4,
"signedDuctFlowDiscrepancyM3Second": 1
}
}Limitations and assumptions
Units, ledger boundaries, survey interpretation and model applicability must be independently established. These summaries do not assign reserve/resource classifications or establish support adequacy, ventilation safety or an operating setting.
Missing required fields, unknown fields, wrong types and violated rules return input issues. Numeric values and outputs must be finite. Lists and matrices must be dense, without missing cells. Numeric lists allow at most 10000 entries; ordinary string lists allow at most 128 strings of 128 UTF-16 units each; numeric matrices allow at most 128 rows and 128 columns, subject to narrower requirements above.
Alternative or Complementary methods
For a related step, use Oxygen Requirement Ventilation Calculator: Measured oxygen loss across an air traverse can be expressed as an observed consumption rate. For a complementary comparison, use Methane Dilution Ventilation Calculator: A measured methane concentration change across an air traverse can infer a source rate under a steady matched-flow model.
References
-
Ventilation Air Velocity Calculator — tool.io
Similar or alternative tools
- Oxygen Requirement Ventilation Calculator
Measured oxygen loss across an air traverse can be expressed as an observed consumption rate.
- Methane Dilution Ventilation Calculator
A measured methane concentration change across an air traverse can infer a source rate under a steady matched-flow model.