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Some other considerations:
- Smaller alternator and reduced electrical loads
- Connect two die grinders to the alternator. the steam must be connected in parallel to double capacity. (obviously this will be harder to rig up though)
As stated above it's the steam expansion that produces the usable power not the density of the fluid. Fluid density will come into play when designing a turbine but it's always the the expansion of the fluid that's the driving force.
I'm still wondering about a a/c compressor being used as an expander (motor). the physical size of a typical car a/c compressor is considerable larger than a typical air tool which suggests to me that it flows more CFM. If anyone has an old compressor sitting on a shelf please put some compressed air to the inlet (or outlet?) to see if it will run as a motor. It should run as a motor unless it has valves that don't allow it.
If it works, an AC system can be turned into a closed loop heat engine. simply run a small belt from the compressor to the alternator, disconnect the evaporator and run the lines to you new boiler. The condenser will now be low pressure so a small pump will be needed to push the condensate back into the higher pressure boiler to complete the cycle. Done and Done.
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