What does TIR stand for in Window Pane Fenestration?

Question

When looking at glazings within various public databases I see the fields "tir" shown often. E.g as seen below:
"glazing_data": {
        ...
        "tir_front": 0.0,
        "tir_back": null,
        ...
    }

What does this field stand for?

kamran · Accepted Answer

TIR: Thermal infrared (longwave) transmittance of the glazing layer.
Lawrence Berkeley National Laboratory has a windows program called THERM 6.3 / WINDOW 6.3
NFRC Simulation.
In pp 55 of this manual, there is a table referencing some properties of the glazing, including this.

here is the Therm 6.3 prog dowmload.

What does TIR stand for in Window Pane Fenestration?

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