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Calc Otto cold air standard

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p-V Diagram: 0:32
Property Table: 1:49
-State 2: 3:45
-State 3: 7:00
-State 4: 8:27
Peak Temperature and Pressure: 9:19
Heat Addition: 10:01
Net Work: 11:30
Thermal Efficiency: 13:10
Perform cold air standard analysis for Otto cycle. Compression ratio 9.5

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28 авг 2024

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Комментарии : 15

@Aer01614 6 лет назад

Wish my professor explained as you do, bravo! He basically has us teaching ourselves and creates his own problems on quizzes and tests that don’t resemble the textbooks. I do feel ready for anything now though

@zoltanterjek1268 3 года назад

6 Years later this dude just saves my ass for the Report I have to do on Otto engines.

@livrodomusico 7 лет назад

Obrigado professor. Aula muito boa! Deus te abençoe sempre!

@joshuastebbins9304 4 года назад

How did you get p4?!

@narvegiljenordas4237 3 года назад

Great video! You definitely gave me a deep understanding for the Otto-cycle, and how to solve problems with heat input, net work, efficiency and so forth. I just have a small question: To find the work and heat using the first equation of thermodynamics, why did you not find the u-values for air at different temperatures in the air-table, and then take the difference in those values to calculate the input or output of heat or work? For example: u3-u2=q2-3 => q2-3=value for u at 1100K- value for u at 738K. I heard there was something about "cold" air, but I really couldn't understand why you had to use q/w=+-Cv*Delta(T).

@tomasdiegobal5080 Год назад

2 years too late, but in “cold” calculations you don’t use the tables to find the properties. If you re-arrange the first and second entropy equations, you get that u2-u1 = Cv(T2-T1) and h2-h1 = Cp(T2-T1)

@Freshboyarly 5 лет назад

Exceptional job sir

@fjskfjdkdksofk 9 лет назад

nice job done by you guys

@mathildaairlines5491 2 года назад

1. An air-standard Diesel cycle has a compression ratio of 16 and a cutoff ratio of 2. At the beginning of the compression process, air is at 95 kPa and 27°C. Accounting for the variation of specific heats with temperature, determine (a) the temperature after the heat-addition process, (b) the thermal efficiency, and (c) the mean effective pressure. Answers: (a) 1724.8 K, (b) 56.3 percent, (c) 675.9 kPa Please help

@poorly_explained_physics 9 лет назад

What value did you use for c_v at 11:15? How did you get it?

@randallmanteufel6411 9 лет назад

cv = 0.718 kJ/kg*K. It is given in the last sentence of problem statement. Original value taken from Table A-20 of the textbook we use, by Moran et.al.