Description
Return drivingForceFraction = (beta*cleanSaturation-processDissolved)/cleanSaturation and actualTransferRate = standardTransferRate*alpha*temperatureFactor*drivingForceFraction.
Air-change and transfer calculations relate a volume, flow, time and driving force under an assumed model. Nominal air exchange or a well-mixed exponential response differs from measured clearance, spatial mixing and contaminant-specific treatment.
Return drivingForceFraction = (beta*cleanSaturation-processDissolved)/cleanSaturation and actualTransferRate = standardTransferRate*alpha*temperatureFactor*drivingForceFraction.
When to use this tool
Use Aeration Oxygen Transfer Supplied Factor when checking a supplied ventilation, concentration-decay or oxygen-transfer term.
How to use the tool and how it works
- Enter standardTransferRate, alpha, beta, cleanSaturation, processDissolved, temperatureFactor. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read drivingForceFraction, actualTransferRate. Use the output convention below.
Require nonnegative standardTransferRate, alpha, beta and processDissolved and positive cleanSaturation and temperatureFactor. Return drivingForceFraction = (beta*cleanSaturation-processDissolved)/cleanSaturation and actualTransferRate = standardTransferRate*alpha*temperatureFactor*drivingForceFraction.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| standardTransferRate | Standard Transfer Rate | Required. Finite number; minimum 0. |
| alpha | Nonnegative supplied process-water transfer multiplier. | Required. Finite number; minimum 0. |
| beta | Nonnegative supplied saturation correction multiplier. | Required. Finite number; minimum 0. |
| cleanSaturation | Clean Saturation | Required. Finite number; strictly above 0. |
| processDissolved | Process Dissolved | Required. Finite number; minimum 0. |
| temperatureFactor | Positive supplied temperature correction multiplier. | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| drivingForceFraction | Signed saturation-relative driving force; may be negative. | Required. Finite number. |
| actualTransferRate | Actual Transfer Rate | Required. Finite number. |
{
"input": {
"standardTransferRate": 100,
"alpha": 0.8,
"beta": 0.9,
"cleanSaturation": 10,
"processDissolved": 2,
"temperatureFactor": 1
},
"output": {
"drivingForceFraction": 0.7,
"actualTransferRate": 56
}
}Limitations and assumptions
- alpha, beta and temperatureFactor are dimensionless supplied corrections, not calculated water-property models. A negative driving force yields negative transfer without clamping. No oxygen demand, aerator selection or operational safety is established.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use measured effective airflow and a suitable mixing or transport model before drawing conclusions about treatment performance or exposure.
References
Similar or alternative tools
- Dissolved Oxygen Saturation Deficit Term
Return deficit = suppliedSaturation-measured and saturationFraction = measured/suppliedSaturation.
- Stack Gas Dry Wet Volume Factor Tool
Dry/wet concentration correction at matching pressure and temperature with a volume-basis water-vapor fraction.