Nem éppen. A NASA-ban már vitatják. Pl. a második fõtétel szerint nem építhetsz hõenergiát százszázalékosan mechanika/villamos energiává alakító gépet. (másodfajú perpetuum mobile) Csakhogy hõenergiát tudsz százszázalékosan kémiai energiává alakítani. Arról meg vita van, miszerint a kémiai energiát százszázalékosan tudod-e villamos energiává alakítani. (Elvileg igen, bár már ez is ellenkezik a II fõtétellel)
Sokan azt vallják hogy a második fõtétel csak egy magyarázat arra hogy nem sikerült a hõ energia konverziója más energiává 100 százalékosan.
Már pedig ha egy ilyen gépet valaki elvileg le tudna írni, akkor sok minden megdõl, fõképp az entrópia fogalma, mert az a második fõtételre támaszkodik.
"Electrochemical energy conversion by-passes second law ofthermodynamics
Oman, H.
This paper appears in: Applications and Advances, 2001. The Sixteenth Annual Battery Conference on
Publication Date: 2001
On page(s): 245-249
Meeting Date: 01/09/2001 - 01/12/2001
Location: Long Beach, CA, USA
ISBN: 0-7803-6545-3
References Cited: 6
INSPEC Accession Number: 6984373
Digital Object Identifier: 10.1109/BCAA.2001.905132
Posted online: 2002-08-07 00:18:20.0
AbstractNew spacecraft will explore the outer regions of the solar system where sunlight is too weak for generating the required electric power. Europa, the orbiter of Jupiter's moon, will require 210 watts of power for its six years of post-launch lifetime. Low-power radioisotope-heated thermoelectric generators have powered 26 spacecraft on deep-space missions, but their efficiency is only around 6%. Developing a larger radioisotope general-purpose heat-source (GPHS) for the new missions is not feasible in today's social environment. One candidate for converting heat to electric power from the existing radioisotope heater is the alkali-metal-electrochemical (AMTEC) converter. With its heat source it would weigh 18 kg and deliver 210-watts with an efficiency of 21.6%. Lifetimes in test are now over 60000 hours. The alternative energy converter is the free-piston Stirling engine in which the pistons are precisely supported with flexing diaphragms so that pistons do not have any moving contact with cylinder surfaces. Maintenance-free operating lifetimes of 100000 hours have been demonstrated. A 210-watt Stirling-cycle converter and its GPHS would weigh 16.1 kg and have an efficiency of 26%. An interesting new approach could be a combined-cycle power source in which the Stirling engine is topped by an AMTEC converter
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