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Steve ,

I could be wrong, but iirc even tho you can boil the water at lower temperature, it still takes the same amount of energy to change phase, so the efficiency gain isnt as spectacular as you might expect.

Brokkr ,

The energy to change phase, the latent heat of vaporization, does decreases. Enough such that the ambient temperature is able to supply sufficient heat for vaporization (that is, boiling). The latent heat of vaporization is temperature and pressure dependent for most materials.

Steve ,

Akshuly, the charts I can find on the subject of enthalpy of vaporization vs pressure say the opposite- it increases at lower pressure

For example: researchgate.net/…/The-enthalpy-of-vaporization-s…

Brokkr ,

I could have gotten it backwards. Depends on how the system is being defined and which direction the heat is going.

Steve ,

I do agree that at some point ambient temperature does the job, which is obviously super convenient.

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