Document information
- University
- Politecnico di Milano
- Degree programme
- Energy Engineering
- Subject
- Combustion and Safety
- Academic year
- 2013-2014
- Classification
- Exam · Full exam
- Content
- Exam paper only
- Original format
- Text
- Searchable text
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03 02 2014 svolgimento
Study material for Combustion and Safety, shared by the Studwiz community and reviewed by moderators.
Combustion and SafetyFull exam
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Study material for Combustion and Safety, shared by the Studwiz community and reviewed by moderators.
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TEMA ESAME COMBUSTIONE E SICUREZZA 8 CFU DEL 3/02/2014 ESERCIZIO 4 PCI=2032,2 kJ/mole (26,05 MJ/kg) a) Portata fuel= 1,151E-04 kg/s b) Portata aria=1,311E-03 kg/s c) Dal sistema (V=portata volumetrica miscela, h=altezza fiamma, R=raggio bruciatore) 2R () V tan( ) LS sen alfa Ralfa h ° °® ° °¯ S E facendo uso di note relazioni trigonometriche, Il semiangolo di apertura del cono di fiamma (alfa) risulta: > @2 2() () ( ) /1 0 Lsin alfa sin alfa S h VS alfa=4,85° da cui R = 0,85 cm d) Tad = 1918 K ESERCIZIO 5 a) LEL mix=6,08%, massaFuel=0,283 kg b) Esiste anche un limite superiore di infiammabilità! Quindi… TEMA ESAME COMBUSTIONE E SICUREZZA da 5 e 6 CFU DEL 3/02/2014 ESERCIZIO 5 a) PCI=1322,92 kJ/mole PCI=48,64 MJ/kg b) Portata aria= 21,53 kgAir/kgFuel c) Portata fuel= 2,056E-02 kg/s d) Portata CO2= PortataFuel/MassaMolareFuel*3*0,6= 5,99E-02 kg/s
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