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January 28, 2012


david pacholok

Since they have an ICE on board, it might make sense to use some of its waste heat to increase the temp/pressure of the working fluid, pressurized air to acheive a "free" increase in the energy content thereof. If a cycle first pressurizes "cold" air (adiabatic heating to 5000 PSI is not practical with present materials - they would melt - heat must be dissipated between compressor stages)and then uses scrap stored heat to increase/maintain pressure as compressed air is used later in the cycle an increase in eff may well result.
I cannot think of a way to do this inexpensively, however.

Howard Edelman

Internal combustion is an air compressor/motor where instead of adding air under pressure at the right moment, some fuel mixed in with the air is ignited to add temperature at the right moment. PV=NRT still works.

BTW What kind of ice are you referring to.

Carl Schwab

Comment to David P.--
In thermodynamics, an adiabatic process or an isocaloric process is a thermodynamic process in which the net heat transfer to or from the working fluid is zero. Such a process can occur if the container of the system has thermally-insulated walls or the process happens in an extremely short time, so that there is no opportunity for significant heat exchange. I think the isocaloric is a better term to describe what I thought Tata had to solve to make a practical hybrid.
There are some attractive features. ----Carl Schwab

value garage equipment

There are hand-powered air compressors, but most are powered by either electricity or natural gas. Natural gas air compressors usually are more cost effective. If the air compressor is used in a small, enclosed area, however, an electric model might be more desirable in order to avoid gas fumes.

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