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Recent content by FOURe

  1. FOURe

    Solid Fuel Molecular Weight & Empirical Formula determination

    Hi there: In my opinion, one should set up a basic spreadsheet type calculation to find out what the molecular weight of the solid fuel under consideration is. For a known fuel ultimate analysis breakdown -- it would consist of carbon, hydrogen, sulfur, oxygen, nitrogen and water vapor (ash...
  2. FOURe

    Incinerator

    Bug6: As far as I can see, units are not OK in the first equation -- there is no temperature multiplying first two terms in the equation. I would suggest that you work with enthalpy values in your energy balance equations ... Thanks, Gordan http://www.engineering-4e.com
  3. FOURe

    4-strokes obsolete?

    I would add just better overall engine performance ... http://www.engineering-4e.com
  4. FOURe

    Clarification on Brayton Cycle

    Ferex: During combustion, fuel chemical energy gets released and as a result the working fluid temperature goes up as well as enthalpy. OK, here are a few typical plots regarding the basic Brayton Cycle operation -- thermal efficiency, specific power output and power output: Thanks...
  5. FOURe

    Clarification on Brayton Cycle

    Ferex: Yes, you are right that the real combustor exit cross sectional area reduces because the secondary cold air stream gets injected and as a result the working fluid temperature goes down while its density increases -- according to the mass flow rate equation, the cross sectional area...
  6. FOURe

    Clarification on Brayton Cycle

    Hi there: My suggestion is just to look at the typical temperature -- entropy (T -- s) diagram for the Brayton Cycle operation. Also, to help you with the understanding of isobaric process when combustion takes place -- combustion takes place at constant pressure, one can assume that...
  7. FOURe

    Determining choked flow

    zdas04: Thank you for your reply and remarks with respect to my input. In my opinion, when dealing with nozzle operation, a temperature vs entropy diagram could be used to indicate the nozzle expansion process. Also, there should be some kind of presentation of Tstagnation/Tstatic as well as...
  8. FOURe

    Determining choked flow

    Hi there: Here a few plots dealing with the general nozzle performance: Also, here are a few online calculators for compressible flow: http://www.engineering-4e.com/calc5.htm Thanks, Gordan PS I have to point out that I agree with ione and davefitz -- they are correct, you need...
  9. FOURe

    CVF and Windows 7

    Hi there: Over the Internet, I have read that "old" Windows XP compatible stuff that does not run under Windows Vista, could and/or should run under Windows 7 ... The best thing is to give a try and see what happens when you have your software loaded and installed on a Windows 7 computer ...
  10. FOURe

    Alternative jobs for an entry-level EIT

    David: Working with MS Office applications and ORACLE (SQL), databases in general. Being an engineer, one should be familiar with basic programming -- such skills are precious and can be easily expanded. In my opinion, computer based skills are in demand today and a technical background is a...
  11. FOURe

    Alternative jobs for an entry-level EIT

    David: Being an engineer, you should have some decent computer skills. Therefore, I would suggest that you can always use your background and computer skills in getting some kind of an analyst and/or analytical position. You could do logistics work too ... In my opinion, having an...
  12. FOURe

    Compression ratio question

    Here are a few typical ideal Otto and Diesel cycle plots: http://www.engineering-4e.com
  13. FOURe

    Compression ratio question

    Hi there: In my opinion, regular compression ratio is ~ 15 to 20 [/]. I have no idea what the achievable highest compression ratio is. The higher the compression ratio, the more difficult it gets to make it work ... In general, there is always some kind of an optimum combination of...
  14. FOURe

    Make a List in Word into a video

    Move the desired material from MS Word to MS PowerPoint. Create GIF and/or JPG files out of your MS PowerPoint file and then use a video software package -- for example, Photo Slide Show -- to create an AVI file ... There are many ways how one can create a video file out of image files ...
  15. FOURe

    Excel Issues

    I can only say that when using MS Excel 2007 on a Vista computer there is no problem in deleting rows ... Something is not right ... http://www.engineering-4e.com
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