ThermoDraw

Thermal network diagrams for Python. Emits SVG. No runtime dependencies. Version 1.1.0.

One square centimetre of a regeneratively cooled methalox throat wall, combustion gas to methane coolant

One square centimetre of a regeneratively cooled methalox throat wall at Raptor-class conditions, from combustion gas to coolant. The file holds no coordinate, the numbers are estimates from public figures rather than SpaceX data, and thermodraw check --physics confirms they agree with each other. The library's own page of it.

pip install thermodraw

EditorDraw networks and rectangular systems; check supplied values or solve supported unknowns. Files stay in your browser; a link carries a diagram to anyone.
Editor guideFind components, edit beside objects, check and solve.
Symbol dictionaryWhat each of the twenty symbols means, and when to use it.
Symbol referenceEvery symbol at eight orientations, with the reasoning.
GalleryFifteen networks drawn by agents who had only the schema and a brief.
The formatThe whole schema, written to be pasted into a prompt.
What 1.0 promisesWhat changes only by addition, and what is not promised.
PyPIWheel and sdist. Python 3.10 or later.

The gallery

Run 2, 2026-09-01

Five agents in a clean room outside the checkout, from the schema and a brief, one commit each, transcripts committed. Their numbers do not close under --physics, and every agent said so.

Run 3, 2026-09-02

Five briefs whose numbers were solved as networks before the prose was written, in a room built by tools/clean_room.py. No diagram reports a balance finding.

Run 4, 2026-09-03

Run 3's briefs again with at forbidden. Four chains were placed by the solver with no coordinate in the file; the fifth is a star, was refused by name, and was placed by hand.