That sounds really fun. Do you remember what the approach was? I know that these lumped models are standard in heat transfer calcs, but the application to huma

That sounds really fun. Do you remember what the approach was? I know that these lumped models are standard in heat transfer calcs, but the application to humans is always interesting. It reminds me a lot of thermal comfort models built to represent human comfort relative to environmental conditions. They all tend to use simplified heat balances to model the heat exchange (with net loss/gain resulting in feeling cold, hot respectively), and there's a couple (Pierce Two-Node Model) which uses two thermal lumps, one for the internal core, and the other for the skin.