Description
Return a lumped thermal-lag temperature prediction.
Conservation records distinguish sampled support, retained material, environmental bands and time-dependent model terms. A caller-supplied band or decay constant does not establish an appropriate preservation target. Local bookkeeping and simple exponential response models require separate evidence about the object and its environment.
Return a lumped thermal-lag temperature prediction.
When to use this tool
Use Art Object Thermal Lag One Reading when checking the stated sampling, material balance or environmental-response convention.
How to use the tool and how it works
- Enter objectTemperature, airTemperature, elapsedMinutes, timeConstantMinutes. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read predictedTemperature, retainedDifference. Use the output convention below.
Return a lumped thermal-lag temperature prediction. Require elapsedMinutes >= 0 and timeConstantMinutes > 0; retainedDifference = (object-air)*exp(-elapsed/tau), predicted = air+retainedDifference.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| objectTemperature | Object Temperature | Required. Finite number. |
| airTemperature | Air Temperature | Required. Finite number. |
| elapsedMinutes | Elapsed Minutes Unit: min. | Required. Finite number; minimum 0. |
| timeConstantMinutes | Positive supplied lumped-response constant in minutes; not estimated from data. | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| predictedTemperature | Predicted Temperature | Required. Finite number. |
| retainedDifference | Retained Difference | Required. Finite number. |
{
"input": {
"objectTemperature": 10,
"airTemperature": 20,
"elapsedMinutes": 0,
"timeConstantMinutes": 30
},
"output": {
"predictedTemperature": 10,
"retainedDifference": -10
}
}Limitations and assumptions
- This assumes a constant air temperature and supplied time constant; moisture response, gradients and safe acclimatization are not determined.
- 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
Review verified records and the object-specific preservation assessment with a qualified conservator for actual sampling, display or treatment decisions.
References
Similar or alternative tools
- Display Case Air Exchange One Interval
Return ideal case-air excess decay for one interval.
- Object Surface Sampling Fraction Tool
Calculate object surface sampling fraction from explicit caller-supplied inputs.