Uvod u termodinamiku (prvo predavanje - Termodinamika I, dr.sc.Sandira Eljsan, MF Tuzla)
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zakon uspjehaFull description
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Zbirka zadataka iz termodinamike, termo i plinske elektrane. Rješeni primjeri i zadaci.
Zadaci iz termodinamike I i IIFull description
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Zbirka zadataka iz termodinamike, termo i plinske elektrane. Rješeni primjeri i zadaci.
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Ekosistemi zemlje
MarfiFull description
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zakon
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Bilans energije
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The First Law of TD (conservation of energy) Deutsches Museum, München
Robert Mayer discovered the first law of TD in 1842 Historical Formulation: Heat is a form of energy. Energy (the capacity for work) can only be converted into various external forms, and it cannot be created from nothing or destroyed (Robert Mayer,1842; James Prescott Joule, 1843; Hermann Helmholtz, 1847). A "perpetuum mobile," i.e. a machine capable of continuously producing work out
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PRVI ZAKON U KONAČNOM OBLIKU Prvi zakon je zakon je bilans energije. On kaže da se toplota dovedena sistemu raspodeljuje na povećanje njegove ukupne energije i rad koji se iz tog sistema može dobiti:
Q
E tot
W Etot U Ep Ek
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PRVI ZAKON TD: za kompleksan termodinamički sistem
Et o t
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Kada se prvi zakon napiše kao diferencijalna jednačina, uočavaju se posebne oznake diferencijala za toplotu i rad zato što toplota i rad nisu funkcije stanja nego procesa.
Q dE W
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Posledica čijenice da toplota i rad nisu funkcije stanja nego procesa je da njihov diferencijal ne može da se integrali kao pravi diferencijal:
2
Q Q 1
2
Q1
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1. Specijalni termodinamički sistem (izjednačavanje rada sa energijom)
Siste stem A:
WA 0
dE
W
W
dE
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2. Specijalni termodinamički sistem (izjednačavanje toplote sa energijom) Siste stem B:
Q
dE
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Q i W su načini kako je došlo do promena energije sistema već su
