Refrigerants, Wide range EGO and other thoughts.

[Danny Barrett]

Some interesting thoughts here - I'll have to re-read this when I have the
time (ie. about the water injection).

As for refrigerants, I am intending to extract heat from the exhaust, but
not for an intercooler - the only thing I'll tell you is that I intend to
"recycle" otherwise wasted heat energy. As for detail - You guys will simply
have to wait...





>Refrigerants
>
>Sounds like someone is trying to adapt the ammonia absorption cycle
>refrigeration system to use as an intercooler.  What is interesting is that
>although this cycle is less "efficient" at cooling than a compressed gas
>cycle, it gets it's pumping energy from heat - in the case of a propane RV
>refrigerator from a small propane flame, or in this case from the waste heat
>of the exhaust.  The problem is probably the exhaust temperatures raise the
>ammonia/water solution past the efficient working range and the gentleman is
>looking for another absorption cycle fluid that will work in this range.
>Just my uneducated, plebeian guess.
>
>On water injection, once upon a time about a hundred years before OTTO or
>Diesel published, a man called Watt wrote the book about water and steam.
>Since then, there is a whole field of engineering and science devoted to the
>fact that water is NOT an ideal gas and steam detests the Carnot cycle.
>Ricardo has been mentioned - a fine M.E. starting place - but really, not
>only is there a book about how water is different, but a whole damned
>encyclopedia.  Without consulting a few chapters of this information, what
>is being presented is simply anal extraction - something I have been accused
>of and occasionally guilty of myself.
>
>Little things to keep in mind (following data is from recall - somebody
>buried my best reference three feet under in his reading room library - and
>is subject to ERROR).
>
>Water raised to aprox 705 f degrees creates steam at 3206 PSI. This is the
>highest temperature and pressure saturated steam can develop.  Superheated
>(dry) steam temp pressure scales skyrocket past these numbers into
>unbelievablum.  Keep in mind that 1000 PSI chamber pressure is probably the
>max that most engines ever see and then figure out the steam contribution to
>that number at 1800F.
>
>Then, without numbers to state exactly, my best recollection is that the
>state change energy in Btu's for water to change to steam is far greater
>that its ability to absorb heat below the state change.  (Course I don't
>have the book handy).  This implies that the water temp for water injection
>is almost meaningless.  Also, remember the specific energy figures of fuel
>air.  Two sets of data, one where all the energy is used (water condensing)
>and the one that is significantly lower - where the water is uncondensed.
>See Bruce Hamilton Gasoline FAQ for example.  The difference is the
>unrecovered energy trapped in the steam.
>
>Remember that one gallon of gasoline combusted makes two gallons of
>uncondensed (un mechanically recovered) steam in the exhaust.  Just some
>thoughts to stir some cells.
>
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