I found it from first principles, I still don't know why no one else thought about it, but it requires sort of splitting and reversing a normal stirling engine inside-out. Since then I've found several attempts at going in that directions which I took, but no one connected all those pieces yet as far as I know. This doesn't require any advanced materials, just a new configuration of existing inventions. For 15 years I've thought why it should not work, but I can't find a flaw in my reasoning, so now I need to verify it with actual working machine, because I know I still might be wrong. If I'm right - this will change energy generation and storage (no more steam turbines and will replace PV panels). If I'm wrong - someone will potentially lose about $10k.