Do the fabric-optics conclusions of the thermal-comfort model survive a different two-node implementation?

What it found

Adds infrared transmittance, outer emissivity, solar absorptance, radiant temperature and solar load to the switchable two-node model and compares each property’s effect under the repository’s design choices and under those of pythermalcomfort. Over four stylised scenarios the properties rank identically by dry-heat-loss effect; sizes agree within 3% in a 28 °C room but differ by up to about 2× in cool air (traced mostly to the variable skin mass fraction) and in sun (convection coefficient); the one sign change is under 0.1 °C. The reference has no optics, so its optical terms are my own linearised construction without an external check. A comparison of implementations, not of people or measured fabrics.

A figure from its own output

Paper, code and results

• README and method
• Experiments and results
• Code
• Tests

More in Engineered clothing

• Do the fabric-optics effects on thermal comfort change once the two-node model reaches steady state?The fabric-optics comparison of garment-twonodeoptics run to steady state instead of one hour: the cool-room disagreement between design choices mostly vanishes (stylised).
• Do the closed and open bounds of an infrared-gating textile survive other two-node design choices and steady state?The closed-to-open bounds of an infrared-gating textile from garment-thermal hold under both two-node choice sets and at steady state: opening the gate cools skin by 0.20–0.25 C at 31 C and keeps it 1.4–1.5 C cooler at 16 C; stylised, preliminary.
• What does a thermostat-driven infrared-gating textile do that its fixed closed and open states do not?A skin-temperature-triggered infrared-gating textile with hysteresis and actuation lag settles to a fixed closed or open state under constant rooms (no chatter, lag only delays the start); gains need changing conditions; stylised, preliminary, mostly null.
• When the room temperature steps, does a thermostat-driven infrared-gating textile beat its fixed states and approach an oracle?Under a single step in room temperature, a thermostat-driven infrared-gating textile beats both fixed states after a step up and tracks an oracle schedule closely (stylised).
• When the metabolic rate steps from rest to walking, does a thermostat-driven infrared-gating textile beat its fixed states?A step in metabolic rate (rest to walking) instead of room temperature for the thermostat infrared-gating textile: at 24 C the gate beats both fixed states under one choice set and ties fixed closed under the other, at 28 C staying open is as good as any policy, and a 10 min lag erases the gain after walking stops; stylised, preliminary.
• If a thermostat infrared-gating band is tuned on some rooms, does it still help in rooms it never saw?Tuning the thermostat infrared-gating band on training rooms and testing on held-out rooms: a narrow band just below 33.7 C carries over (about 0.01 to 0.06 C better than the untuned band) but chatters, up to 24 switches in 180 min (stylised).

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Produced with AI assistance (Claude). Results are from the code in this repository and are simulated or stylised unless the abstract says otherwise; nothing here implies affiliation with or endorsement by any lab, researcher or company cited. MIT licensed.