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Enthalpy engineDear respected gurus- I've an idea that probably is a stupid one , and only proves my ignorance, but maybe...If we heat a mass of liquid or solid, it will expand in a minuscule rate, so it isn't possible to harness this expansion . For this reason heat engines are based on transition from liquid to gas. If we find a way to convert the energy that is stored in a heated mass of liquid or solid to mechanical energy, probably we would benefit the cooling process of the solid/liquid mass.By the cooling , the attraction forces of the molecules will contract this mass, and I'm asking: If we could harness this attraction forces through the contraction .The same as the expansion but vice versa: again to covnert it to mechanical energy!I think that in such a way we could utilize more enthalpy than through evaporation. And I like to know if my definition of this process is correct, by saying that I suggest to harness the total enthalpy of the heated mass, minus the enthalpy of the mass at the ambient absolute temperature ?

I was pretty sure that some sort of safety program was messing with your posts!

Congratulations you found a way to circumvent it by posting an innocent question followed by the restricted one!

If you are keen to evaluate your question based on the laws of thermodynamics you will find that this is clearly a question of principle and the principles have not changed as to my knowledge.

I regret to inform you that I am not able to explain this to you to your full satisfaction!

Others might, but this being Christmas time it might slip through the daily posts!

All the best!

IS

I would venture to guess that you have answered your own question by stating the expansion and contraction is miniscule.

It is much easier to transfer heat from the expansion and contraction than the mechanical energy involved. This is why we have refrigerators and not thermal engines of the kind you imagine.

Mechanical advantage thermal engines are based on the gaseous state, not the liquid state. AFIK.

I the update to the system it appears that they place a time on how long you have to post a question or reply to one. It times out and you get the message it can not process it. Just copy the post. Back out to the reply or post buttons. Then do it again this time paste what you wrote. Should take it then.