Inflatable envelopes in space are challenging (micrometeoroid damage). The envelope, and thus the gas, need to be hot, lest T^4 swamp R^2. It's feasible to cool

Inflatable envelopes in space are challenging (micrometeoroid damage). The envelope, and thus the gas, need to be hot, lest T^4 swamp R^2. It's feasible to cool a reactor to low-pressure gas (Mars atmosphere [1]) using forced convection, but that's cold gas and IIUC the heat exchanger is comparable to the size and mass budgets of a radiator. So attempting a steelman of a set of forced-convection radiators on poles, hosing hot gas against the envelope... hmm. Big picture, this attempts a low-mass heat transfer construct, using a large-scale low-pressure gas flow, where the cold-side surface is nearly as hot as the hot-side, and is extremely mass constrained (thus flat-ish). Seems hard? Fun thought experiment - thanks! [1] Colgan Mass Optimization [...] Forced-Convection Heat Exchanger for Mars Surface Waste Heat Rejection 2023 https://asset.library.wisc.edu/1711.dl/FYJCG5YME7O4X82/R/file-ce70a.pdf https://asset.library.wisc.edu/1711.dl/FYJCG5YME7O4X82/R/fil...