Physics 29 Efficiency Of Heat Engines (14 of 14) The Otto Cycle

แชร์
ฝัง
  • เผยแพร่เมื่อ 24 ธ.ค. 2024
  • Visit ilectureonline.com for more math and science lectures!
    In this video I will explain and develop the efficiency equations of the Otto cycle.

ความคิดเห็น •

  • @erfanagheli1644
    @erfanagheli1644 3 ปีที่แล้ว +5

    You are the best. Three years of physics, I could not pass without you. (Mechanic, Electromagnetism, and Thermodynamic). I only watched your videos like I am your student, and took the test in my class. Thank you for always being there and answering my questions. I got an 'A' in all my physics classes.

    • @MichelvanBiezen
      @MichelvanBiezen  3 ปีที่แล้ว +5

      GREAT JOB! That took a lot of hard work and dedication

  • @MichelvanBiezen
    @MichelvanBiezen  11 ปีที่แล้ว +8

    If the example in your work book doesn't include the "n" which stands for "number of moles in the gas sample", then it probably means that they are assuming one mole and therefore they omit that variable. It is better to include it and state that it is "one".

    • @thiha8372
      @thiha8372 3 ปีที่แล้ว

      I've been sitting with one question for 2 days for not knowing that the mole is 1 if it is not specified. Thank you so much for your advice!

  • @edwardburroughs1489
    @edwardburroughs1489 11 ปีที่แล้ว +29

    LOL Otto-mobiles, good one!

  • @Evan2301
    @Evan2301 9 ปีที่แล้ว +25

    The word "automobile" is an hybrid word coming from latin "mobile" which is "motion" and from Greek "auto" which is "oneself" or "itself". It has nothing to do with Otto which is just a coincidence that its name is pronounced in the same way as Auto.

    • @MichelvanBiezen
      @MichelvanBiezen  9 ปีที่แล้ว +11

      Benjamin Henx
      Great explanation. Thanks

  • @MichelvanBiezen
    @MichelvanBiezen  10 ปีที่แล้ว +2

    A carnot cycle is different
    There is a video on the carnot cycle

  • @njeridiva85
    @njeridiva85 7 ปีที่แล้ว +6

    You sir are AWESOME. Cheers to greatly contributing to my Engineering degree!!!

  • @miguevilla1026
    @miguevilla1026 6 ปีที่แล้ว +1

    Your intention to explain was the best but unfortunately not seen on the board what explains. Thank you👍👍👍

  • @MichelvanBiezen
    @MichelvanBiezen  11 ปีที่แล้ว

    Thank you for that insight.

  • @jasminemirkovic620
    @jasminemirkovic620 7 ปีที่แล้ว +5

    oml can anyone appreciate this man for clear explanation instead of shitting about otto and auto.. -_-

  • @ironuranium3927
    @ironuranium3927 5 ปีที่แล้ว +1

    check at 8:24 there will be (+t(a))

  • @simplythinking-abc
    @simplythinking-abc 9 ปีที่แล้ว

    I just can't explain how much this video has helped me!

  • @shylildude
    @shylildude 10 ปีที่แล้ว +1

    at 8:25 on the last term of the numerator, shouldn't that be +Ta? also, does this apply to diesel engines?

    • @MichelvanBiezen
      @MichelvanBiezen  10 ปีที่แล้ว +3

      shylildude
      Good catch. Yes, that should have been a +Ta.
      Actually I forgot to place the parenthesis around them -Td+Ta = -(Td-Ta)

    • @stephendee7839
      @stephendee7839 9 ปีที่แล้ว

      Michel van Biezen
      Add a comment to the video at the point of the error. I noticed this, too.

  • @jamirahamed6023
    @jamirahamed6023 6 ปีที่แล้ว

    I watch your lecture. It is awesome. Thanks lot

  • @radimollov4562
    @radimollov4562 ปีที่แล้ว +1

    what does the formula T1V1^gama-1 = T2V2^ gama-1 represent?

    • @MichelvanBiezen
      @MichelvanBiezen  ปีที่แล้ว +2

      It represents the relationship between the state of a gas defined by its temperature and volume at one point to the state of the gas defined by its temperature and volume at a second point after it has gone through an adiabatic expansion or contraction.

  • @foxhound1008
    @foxhound1008 5 ปีที่แล้ว

    Really enjoy your videos. Wouldn’t this be an alternative method to figure out the efficiency:
    The area under the curve from C to D is the work done by the gas (Expansion) The area under the curve from A to B is the work done on the gas (compression). If I subtract the area from AB from CD, this should be the net work done by the engine (energy extracted). This should be equal to the change in internal energy, as indicated by the temperature change, from C to D.
    Would not this be reflected by Qh-Qc/Qh?

    • @MichelvanBiezen
      @MichelvanBiezen  5 ปีที่แล้ว

      The area inside a complete cycle (when the direction is clockwise) is equal to the work done by the gas.

  • @emmanuelmonforte9928
    @emmanuelmonforte9928 6 ปีที่แล้ว +2

    Bottom line
    High gamma, high compression ratio = higher efficiency
    High gamma, Low compression ratio = high efficiency
    Low gamma, high compression ratio = low efficiency
    Low gamma, low compression ratio = lower efficiency
    Right sir?

  • @sirinafl
    @sirinafl 10 ปีที่แล้ว +14

    Am I only one who notice that;
    He made 2 mistakes consecutively and mistakes canceled each other.

  • @gooddeedsleadto7499
    @gooddeedsleadto7499 3 ปีที่แล้ว

    Could u do entropy change problems with examples for various cycles like Otto, Diesel, Dual, Atkinson and compare it with Carnot Cycle?
    Thanks

    • @MichelvanBiezen
      @MichelvanBiezen  3 ปีที่แล้ว

      Good suggestion. Not sure when we can make them. We are working on other topics at the moment.

  • @historyisthebest5831
    @historyisthebest5831 4 ปีที่แล้ว

    Sir. In my textbook, there's a statement describing that there must be heat transfer out of the system(Qc) in order to get a net work output. The heat transfer process is d to a in this video which is an isochoric process. I don't understand why heat must transfer out to get a net work output. Isn't work in an isochoric process 0? The situation in my book is exactly an otto cycle like the one in your video/

    • @MichelvanBiezen
      @MichelvanBiezen  4 ปีที่แล้ว

      For a thermodynamic cycle to perform work, it must take in energy (Q) from the environment since in a cyclic process, the internal energy of the gas returns to its original amount after each cycle.

  • @tirannnus
    @tirannnus 6 ปีที่แล้ว

    The net work done could be calculated two ways:
    Using the Cv*(dT) method
    or Integrating PdV where P = C/V^k
    Right?

  • @Aapton
    @Aapton 11 ปีที่แล้ว +4

    great video, although it's automobile, not ottomobile, as everybody knows, but I was not sure whether the lecturer was serious or joking :)

    • @MichelvanBiezen
      @MichelvanBiezen  11 ปีที่แล้ว +4

      Yes, you are not the first one commenting on the otto vs auto.

  • @morrocantocador
    @morrocantocador 6 ปีที่แล้ว +2

    whether its Ottomobile or automobile you are presenting a good stuff on your channel. keep going. By the way looking to your family name are you from German, Netherlands or Belgium? i'm just curious about your origin because we see this name so often here "Van+..."

    • @MichelvanBiezen
      @MichelvanBiezen  6 ปีที่แล้ว +4

      Good insight. Yes indeed I grew up in Belgium. Thanks for the comment.

  • @agriculturalengineeringwit6808
    @agriculturalengineeringwit6808 7 ปีที่แล้ว +1

    Good explaination

  • @subhanshu88
    @subhanshu88 10 ปีที่แล้ว

    thnku for dis great video

  • @nishantboddupalli
    @nishantboddupalli 8 ปีที่แล้ว +4

    "automobile" originates from "automatic" and "mobile", not "Otto" as he says at 0:30

  • @Mech.Masters
    @Mech.Masters 10 ปีที่แล้ว

    I have a good doubt,think on it........4-1 process represent exhaust and it takes place at constant volume....Now link this thing to movement of piston.Exhaust takes place when the piston moves from BDC to TDC this means volume is changing during exhaust........still why does the cycle shows a constant volume exhaust.

    • @MichelvanBiezen
      @MichelvanBiezen  10 ปีที่แล้ว

      The volume is constant from b to c and from d to a.

    • @Mech.Masters
      @Mech.Masters 10 ปีที่แล้ว

      I got the answer..

  • @smailwaltit38
    @smailwaltit38 9 ปีที่แล้ว

    thanks for the great video !

  • @edwinthomas544
    @edwinthomas544 7 ปีที่แล้ว +1

    SIR YOUR EXPLANATIONS ARE FAB BUT COULD U JUST SOLVE SOME MORE COMPLEX PROBLEMS LIKE THE PROBLEMS HAVING 2 REVERSIBLE ENGINES .IF U COULD IT WOULD BE A GREAT HELP. THANK YOU FOR U SERVICE

    • @MichelvanBiezen
      @MichelvanBiezen  7 ปีที่แล้ว +1

      We just started a second series of thermodynamics which will be covering more advanced topics. (But it will be a while before it is completed).

  • @heavy2028
    @heavy2028 10 ปีที่แล้ว

    great videos thanks!

  • @kiddyflo
    @kiddyflo 11 ปีที่แล้ว

    Good video man. Helped me on a sticking point. But just a not on the word "auto-mobile".
    The auto-mobile is called auto-mobile from Latin. Auto- meaning self and -mobile meaning moving/movable. Hence auto-mobile means "self moving"

  • @Nanba91
    @Nanba91 4 ปีที่แล้ว

    THANK YOU

  • @sshah5893
    @sshah5893 11 ปีที่แล้ว

    I am working through my workbook as well as following your example. I'm confused since the example I am looking through there is no "n" value.

  • @latifabechri8951
    @latifabechri8951 5 ปีที่แล้ว +1

    Thank youuuuuu

  • @AnuragPradhan101
    @AnuragPradhan101 10 ปีที่แล้ว

    is it carnot cycle ?

  • @lucasleal2915
    @lucasleal2915 7 ปีที่แล้ว +1

    what is C sub v??
    can anyone help?

    • @MichelvanBiezen
      @MichelvanBiezen  7 ปีที่แล้ว

      c for an object is its specific heat (the amount of heat you need to add to raise 1 g of the object by 1 degree centigrade c for a gas is the amount of heat you have to add to raise 1 mol of the gas by 1 degree centigrade. But for a gas there are two values for c, one for when the volume stays constant and 1 for when the pressure stays constant. Cv is the specific heat at constant volume.

    • @lucasleal2915
      @lucasleal2915 7 ปีที่แล้ว

      Ahh okay I understand, thank you for the speedy response it really helps now that my exams are coming up!

  • @dimitardimitrov9958
    @dimitardimitrov9958 9 ปีที่แล้ว

    Why "Ta" is become "- " in 8,25min. of the video ? It was "+"before that....

    • @MichelvanBiezen
      @MichelvanBiezen  9 ปีที่แล้ว

      Dimitar Dimitrov
      Good catch. Yes, it should be a (+)
      I corrected it on the next step.

    • @dimitardimitrov9958
      @dimitardimitrov9958 9 ปีที่แล้ว +1

      Thank you,
      I really enjoy your way of teaching,...compliments!

  • @LuisVasDeCamoes
    @LuisVasDeCamoes 10 ปีที่แล้ว +5

    its automobile (automatic + mobile)

  • @787310
    @787310 8 ปีที่แล้ว

    why are these videos so blurry

    • @MichelvanBiezen
      @MichelvanBiezen  8 ปีที่แล้ว

      +Richard Gluten These are the videos we produced in our first year and we were learning the tricks of the trade. You can improve the clarity by clicking on the "settings" button and click on higher resolution.

  • @MariaM-he6ng
    @MariaM-he6ng 6 ปีที่แล้ว

    Definitely NOT named after Otto! AYTO is a greek word still used in modern Greek and means IT, ITSELF.

    • @MichelvanBiezen
      @MichelvanBiezen  6 ปีที่แล้ว +5

      Yes, I have been reminded by a number of viewers......

  • @AutoMania46
    @AutoMania46 11 ปีที่แล้ว

    supalike.... cheers...

  • @ryanibrahim5464
    @ryanibrahim5464 2 ปีที่แล้ว +1

    This video is as blurry as my idea on what I want to do with my life

    • @MichelvanBiezen
      @MichelvanBiezen  2 ปีที่แล้ว +1

      It is indeed. One of earlier videos before we knew what we were doing

  • @Philwahl805
    @Philwahl805 7 ปีที่แล้ว

    False information after only 30 seconds? How can I trust the rest of the lecture now?