Spartan article. I was curious about the efficiency. Seems like it's theorized as high as 30, but practically is more in line with 20 year old heat pumps? Lots

Spartan article. I was curious about the efficiency. Seems like it's theorized as high as 30, but practically is more in line with 20 year old heat pumps? Lots of articles about simulations. > COP of 3.7 https://www.nature.com/articles/s41467-023-43611-6 https://www.nature.com/articles/s41467-023-43611-6 (2023) > Using elastocaloric systems, these efficiencies can be increased by a multiple. Elastocaloric materials show COPs of up to over 30, and current technology demonstrators achieve simulative efficiencies of over 9. https://analyticalscience.wiley.com/content/article-do/elastocalorics-cool-into-future https://analyticalscience.wiley.com/content/article-do/elast... (2023) Looking for articles by the interviewee, Google Scholar only lists six. This one has a COP study: https://asmedigitalcollection.asme.org/SMASIS/proceedings-abstract/SMASIS2023/87523/1171065 https://asmedigitalcollection.asme.org/SMASIS/proceedings-ab... The 20 COP is at temp. diff of around 3 K. At 20 K diff, the COP seems to land around 3-4. > "The efficiency of elastocaloric materials is more than ten times higher than today’s air conditioning or heating systems – they will require significantly less electricity,” said Motzki. Please also explain what's wrong with existing technologies that makes NiTi relevant in residential buildings. Current numbers don't seem to say what you're saying. I could see this being really useful in e.g. space exploration where you don't want liquids slushing around, or risk leaking gas.