

I don’t think shape change materials are all that efficient. The problem being is you still need some mechanism to compress the material again, which obviously uses energy. As you say their main advantage is that they don’t use traditional refrigerants. But the trade-off for that is that they are mechanically more complicated and probably for any given amount of cooling will require more electricity.
You can trade those off with renewable energy sources of course so it may still be worth it but technically they are worse efficiency than traditional vacuum pumps.



They are not new technology the idea has been around since at least the 1980s. There is a reason we don’t use them and it’s because they are mechanically complicated and inefficient. Those in terms of power use and maintenance requirements.
However with the move to renewable energy maybe that efficiency limitation isn’t as much of a problem as it used to be. Especially if it means you can get away from toxic compounds.
Although I have never seen a commercial grade implementation of the technology. It’s always just been demos that don’t really achieve enough cooling to be anything other than a curiosity.