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Suggestion - instead of liquid N2, one could make liquid oxygen. That would be nice for submarines. You would have energy and oxygen, which you need both.

Looking exactly for the same!

Yeah, looking exactly for the same. I'm in tropics, plenty of hot water from solar collectors. Big ones. Big engine would not be a problem as long as only cheap low-tech materials are used to build it. If the engine gave out just 10 hp or so being big as school bus, so be it!

Yeah, looking exactly for the same. I'm in tropics, plenty of hot water from solar collectors. Big ones. Big engine would not be a problem as long as only cheap low-tech materials are used to build it. If the engine gave out just 10 hp or so being big as school bus, so be it!

<t>The idea od using heat pump and heat engine in closed loop is obviously no-go. But-yes, open loop, basically sucking up energy from ambient air, inputing at temperature x and exhaling it at lower temp, that might work if only we could sort out the efficiencies. If the "efficiency" (COP) of the he...

<t>The idea od using heat pump and heat engine in closed loop is obviously no-go. But-yes, open loop, basically sucking up energy from ambient air, inputing at temperature x and exhaling it at lower temp, that might work if only we could sort out the efficiencies. If the "efficiency" (COP) of the he...

What about disassembling the woofer and using only the huge and strong permanent magnet and the coil?

What about disassembling the woofer and using only the huge and strong permanent magnet and the coil?

Yeah, looking for the same. Some very low-tech thing.

Hi Rob, how huge it would be? Any idea?