Definitely would be really interesting for spacecraft thermal management. Spacecraft only have radiation as a heat transfer mechanism, and they need to be desig

Definitely would be really interesting for spacecraft thermal management. Spacecraft only have radiation as a heat transfer mechanism, and they need to be designed to keep all components within a safe temperature under a range of operating conditions (eg: from receiving no sun on the dark side of a planet to full sun a few minutes later). A satellite in low earth orbit can experience a dozen or more sun/eclipse cycles per day, which makes thermal cycling a major factor in long-term reliability. Moving parts are strongly discouraged for reliability reasons, so thermal design needs to be as passive as possible. Having a solid state switched thermal conductance path would be a huge benefit. Imagine being able to switch a radiator off in eclipse to conserve heat and on in sun to reject it.