Rossi says the current HotCat target temperature is around 1000C.
Zinc's boiling point is 907C and melting point is 420C.
So it seems a molten zinc bath kept near its boiling point might be a good
first-order thermal control with passive characteristics.
If the power were transmitted through vapor reflux to a CO2 heat exchanger,
the mass flow of zinc between vapor and liquid phases would be about 1/2
gram per second for 1kW thermal.
23.6 kJ/mol;65.38g/mol;1kW?g/s
([{123.6 * (kilo*joule)} / mole]^-1 * [{65.38 * gramm} / mole]) * (1 *
[kilo*watt]) ? gramm / second
= 0.5289644 g/s
