[morraine]

Hello, Thanks for taking the time to look at this question.
This is my first post to this forum because i have a burning desire to know the answer to a question with has me stumped. I'm not a chemist, i am more of a hobbyist electrical/mechanical engineer who is working on a home made steam turbine generator. Now i want to make this generator incredible efficient like some geothermal companies do with the use of a work chemical that vaporises in to steam as low as 57f / 13.8c degress.

if you take a look at this website you will see the data from a company who does this for Geo thermal power generation.
http://www.rasertech.com/geothermal/geothermal-multimedia/geothermal-process-animation-video

Does any one know of the chemical they are using to drive the turbines at only 57 Fahrenheit degrees,

Or do you know of a similar chemical which maybe wont vaporise so low but is lower than water ,

Or do you know of a way that i could make water vaporise at temperatures lower than normal boiling point?

[Borek]

Freons come to mind.

Please remember low difference between temperatures of heater and cooler mean low efficiency, that's thermodynamics 101.