Posted by News on February 20, 2012, 11:16 am
The recuperated microturbine is 30% in fuel-energy-to-electrical-conversion.
The waste heat is only in the exhaust and easily captured. As this thread
is about Stirlings, this heat can also be used to run an additional Stirling
engine also turning a genny, improving efficiency greatly. No catalyst,
water-cooling system or oil in the turbine and less emissions.
Microturbines are small anyhow, so the total microturbine/Stirling setup
will not be that big, and smaller than a 4 stroke ICE/transmission setup.
An added benefit is that turbine warm-up is instant, so an absorption a/c
can be used.
The Titanic had a similar heat recovery arrangement. If I recall rightly,
the waste heat from steam turbines was used to assist the piston steam
engines - 100 years ago.
Posted by Jim Wilkins on February 20, 2012, 1:20 pm
Your memory is failing. The turbine took in steam exhausted from the piston
The Lusitania was faster but consumed 1000 tons of coal per day. Titanic was
larger and only a little slower on 2/3 of the coal. Fuel economy really did
matter back then.
Titanic wasn't capable of setting a record and was not quite at full steam
pressure at the collision. Captain Smith deviated so far south to dodge the
reported ice that the Carpathia which rescued the survivors had been on
course for the Mediterranean.
The paint-streaked iceberg:
Posted by News on February 20, 2012, 3:10 pm
Other way around. But still very efficient for the day.
You had to store the coal, which took up valuable revenue earning space and
added weight - and also cost.
Posted by Jim Wilkins on February 20, 2012, 5:23 pm
I picked a thorough technical description to see if you could understand
one, and you didn't.
This is the simple version:
The turbine is last in line before the condenser. It extracts the remaining
energy from the piston engine's exhaust.
Posted by News on December 18, 2011, 1:54 pm
For auto use the Stirling was big, heavy and slow to respond, but far more
efficient than an IC engine. The response was the prime drawback. AMC nearly
introduced a Stirling car in the 1970s, claiming the response was overcome
somewhat. For only turning a constant speed generator in a hybrid and no
other function - range extender - they are starting to make sense. Instant
response is then not an issue. The freewheeling piston design Stirling is
small enough these day for such an application - pending R&D. The external
combustion is far cleaner than explosions in a cylinder as in ICE engines.
Highly efficient condensing burning is possible as in gas and oil boilers.