So superelastic nitinol could be used to fashion a heat pump by placing a wire around a small pulley in the cold reservoir and a large pulley in the hot reservo

So superelastic nitinol could be used to fashion a heat pump by placing a wire around a small pulley in the cold reservoir and a large pulley in the hot reservoir. When the wire is strongly deformed, the phase transition causes it to absorb heat from its surroundings; as a result the area around the small pulley becomes colder. When this strain is released, the phase transformation is reversed and it will release heat to its environment. As a result, the cold reservoir gets colder and the hot reservoir gets hotter. I still wonder why I've never seen even a demonstration prototype of this effect.