@hazlin -157/?? I run a steam powered heat exchanged at work so that part makes sense. The cone taking advantage of hot oil escaping reminds me of both jet engine/generator turbines as well as Tesla Turbines. This case using a heated fluid to do the work to make up for not having huge volume and pressure to abuse such as a hydroelectric damn.
Would be curious to see the efficiency on this kind of motor. Probably would need a starter same as ICEs. If used for a moving vehicle, heat loss would be hard to overcome, I feel. Definitley worth looking at.