Oxygen Requirement Ventilation Calculator

Audit actual inlet/outlet oxygen consumption and independent air traverse before explicit caller minimum comparison, no assumed worker metabolism, oxygen enrichment procedure or breathable mine assurance. Caller independently verifies units, applicability and matching conditions; no operational recipe, safety certification, causal efficacy or legal/resource classification is inferred.

Description

Measured oxygen loss across an air traverse can be expressed as an observed consumption rate.

Measured oxygen loss across an air traverse can be expressed as an observed consumption rate.^[1]

A steady dilution comparison then depends on a separately established minimum outlet fraction.

When to use Oxygen Requirement Ventilation 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 Oxygen Requirement Ventilation Calculator and understand its results

Match completed survey or ledger observations by block, segment or stage and confirm their units and boundaries.
Enter observedOxygenInletFractions, observedOxygenOutletFractions, observedMeasuredAirflowsM3Second, callerMinimumOxygenOutletFractions, using the field meanings and rules below, then run the tool.
Read inferredObservedOxygenConsumptionM3Second, steadyModelOxygenRequiredAirflowsM3Second. 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
observedOxygenInletFractions	Observed oxygen inlet fractions	list of number	Required
observedOxygenOutletFractions	Observed oxygen outlet fractions	list of number	Required
observedMeasuredAirflowsM3Second	Observed measured airflows m3 second	list of number	Required
callerMinimumOxygenOutletFractions	Caller minimum oxygen outlet fractions	list of number	Required

Use aligned positive measured airflows and inlet/outlet/minimum oxygen fractions in [0,1]. Require inlet≥outlet for observed consumption and inlet>minimum for the comparison. Calculate consumed=(inlet−outlet)×flow, then consumed/(inlet−minimum). Return both per-row lists, including zero consumption.

consumed_i=Q_i(Cin_i−Cout_i); required_i=consumed_i/(Cin_i−minimum_i)

Use the matching field units and the exact boundary, ordering and reference rules above.

Output field	Meaning	Value type
inferredObservedOxygenConsumptionM3Second	Inferred observed oxygen consumption m3 second	list of number
steadyModelOxygenRequiredAirflowsM3Second	Steady model oxygen required airflows m3 second	list of number

json

{
  "input": {
    "observedOxygenInletFractions": [
      0.21,
      0.21
    ],
    "observedOxygenOutletFractions": [
      0.2,
      0.19
    ],
    "observedMeasuredAirflowsM3Second": [
      10,
      20
    ],
    "callerMinimumOxygenOutletFractions": [
      0.19,
      0.19
    ]
  },
  "output": {
    "inferredObservedOxygenConsumptionM3Second": [
      0.09999999999999981,
      0.3999999999999998
    ],
    "steadyModelOxygenRequiredAirflowsM3Second": [
      4.999999999999993,
      20
    ]
  }
}

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 Methane Dilution Ventilation Calculator: A measured methane concentration change across an air traverse can infer a source rate under a steady matched-flow model. For a complementary comparison, use Ventilation Air Velocity Calculator: An air traverse integrates signed normal velocity across sampled duct cells.

References

Oxygen Requirement Ventilation Calculator — tool.io

Similar or alternative tools

Methane Dilution Ventilation Calculator
A measured methane concentration change across an air traverse can infer a source rate under a steady matched-flow model.
Ventilation Air Velocity Calculator
An air traverse integrates signed normal velocity across sampled duct cells.