ThermoCal

Live

Thermoelectric assembly without inventing κ

A thermoelectric quantity is defined where it was measured. Linear extrapolation past the last laser-flash temperature is a claim about physics that nobody made.

Seebeck, resistivity and thermal conductivity still arrive as three files, three temperature grids, and a zT that was finished in Excel. The last κ point is 773 K; S and ρ run to 850 K; a dashed zT is drawn anyway. Two hours of Origin styling per panel is treated as analysis.

ThermoCal treats assembly as an instrument. It builds the T-grid on the overlap of the loaded series. If κ stops at 773 K, zT stops at 773 K. The PF–zT tab will show a power factor without a zT until κ arrives. A dashed zT is not drawn. Provenance sits on every cell: measured, interpolated onto the grid, or absent. Lorenz and Th/Tc corrections are explicit, not tribal knowledge.

Figure of merit from the built-in demos, drawn by the same engine the session opens. Bi₂Te₃-like p-type near room temperature; PbTe-like n-type at high T. zT lives only on the overlap of S, ρ and κ.

Seebeck coefficient as drawn by the engine. Closed symbols are measured points; the line interpolates only inside the measured window. Sign is the carrier fingerprint.

Power factor and zT on dual axes — the figure a thermoelectric paper actually needs. Peak and temperature are called in the caption, not left for the reader to guess.

What it does

No extrapolation, on principle — zT lives only on the overlap of S, ρ and κ
Provenance on every assembled cell; the worksheet is live, not an export
Lorenz number and Thomson/Peltier bookkeeping stated rather than assumed
Origin-style paper plots: margins, dual axes, closed/open symbols, captions
One .thermocal.json holds geometry, files, view and corrections