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  1. mfqd13

    Isentropic efficiency vs Real Manufacturer efficiency

    Hi all! Thank you again for all the replies! Very appreciated! stgrme, thank you soo much for the file! It was great to have this for double check! Awsome! georgeverghese, Thanks again for your valuable insights! Good to have this practical and exerienced feedback! Thank you all for the...
  2. mfqd13

    Isentropic efficiency vs Real Manufacturer efficiency

    Dear georgeverghese, Thank you so much for the feedback, again! I understood perfectly what you've said! So, in practical ways, to get the exact power we must get the manufacturer enthalpy value at the outlet, correct? If we are making a study (and we don't have yet this value), the only way...
  3. mfqd13

    Isentropic efficiency vs Real Manufacturer efficiency

    Hi all! Sorry for the late reply. Vacations. I've searched an alternativa use case for this analysis. Please see below the turbine data and my calculation, also with my questions: Turbine data: My calculations: Questions: 1) My total real power (underlined in red) is below the power...
  4. mfqd13

    Isentropic efficiency vs Real Manufacturer efficiency

    pierreick, Correct. Is that. Thanks with the links. MintJulep, So, in your opinion, in practic life, the isentropic value, doesn't gives much of use, correct? We must consider the efficiency given by the manufacturers, is that? georgeverghese, It's exactly that. My issue is not with the...
  5. mfqd13

    Isentropic efficiency vs Real Manufacturer efficiency

    Hi dear georgeverghese, Here are the values: Turbine inlet: Pressure: 60 bar(a) Temperature: 450 ºC Enthaly: 3304,2 kJ/kg Turbine outlet: Pressure: 3 bar(a) Temperature: 133,2 ºC Enthaly: 2724,9 kJ/kg Steam flowrate: 33,41 ton/h
  6. mfqd13

    Isentropic efficiency vs Real Manufacturer efficiency

    Hi all! Digging on the subject i found in several situations with real manufacturers data, that the mechanical (shaft) power output is much more higher than the the one that we calculate using the isentropic efficiency. For instance, i can get the following values, as an example: - Isentropic...
  7. mfqd13

    Natural convection outside helical coil

    Dear MisterE2, Thanks again for the reply! I agree 100% with you. This is a specific phenomena that varies with a ton of things like dimension of the coil, outside fluid properties, etc... So i've searched a lot and in several books, articles and foruns the conclusion was the same that we are...
  8. mfqd13

    Natural convection outside helical coil

    I don't know what you mean with "upright", but i think it is vertical. What tou say about the convection phenomena is correct and thats why i asked for some help with specific formulas for this application. The tube material is SS 316. Thanks
  9. mfqd13

    Natural convection outside helical coil

    Hi everyone, I'm ending some calculations of a helical coil immersed in a liquid solution. Inside the tube runs superheated steam that condensates along it. Here i don't have problems, even though we're talking about condensation. My problem is to calculate the heat transfer coef. outside the...
  10. mfqd13

    Phosphoric Acid (H3PO4) - coefficient of expansion

    Dear Latexman, Thanks in advance for the reply. Meanwhile, i've already made that. I've putted this post, but i forgot that this could be obtained exactly as you said. So thank you anyway.
  11. mfqd13

    Phosphoric Acid (H3PO4) - coefficient of expansion

    Hi, I'm making some heat transfer calculations, to determine a steam coil to heat a phosphoric acid tank. For this i need the coefficient of expansion of this acid. I've searched a lot but i didn't find anything. Does anyone have a value?? Thanks
  12. mfqd13

    pressure drop behind pump

    Please see the pump curvehttp://files.engineering.com/getfile.aspx?folder=53ec56e1-a9b2-46cc-819d-1eb19b32d705&file=PIUSI-PIUSI-EX50-esp.pdf
  13. mfqd13

    pressure drop behind pump

    LittleInch Thanks. Please see the attachment. I've attached also the pump and the filter specifications. Let me tell you i'm only analysing 1 pump, but i will have 3 in parallel and the idea was to put only 1 filter for the whole system...
  14. mfqd13

    pressure drop behind pump

    The only information that i get from the supplier is that the pump has a max. aspiration height of -4m. The difference between the bottom diesel tank and the centerline of the pumps is aprox 400mmm. (i can increase a little bit this) This is in design stage
  15. mfqd13

    pressure drop behind pump

    Hi, i have de following situation: vertical diesel tank with aprox. 7m height above the outlet. next i have a coalescent filter that has a pressure drop of 0,4 bar (clean) to 1,0 bar (change-out). next i have a pump for 50 l/min and 0,6 bar head. it pumps to a consumer at 50m distance and with...
  16. mfqd13

    Pumps in series

    Sorry, i was talking about the nominal flow rate capacity of each pair. Of course, if the 2nd pair in operation mode only works with a flow rate of 100 m3/h the 2st pair will adjust it's working point in the curve, but i was talking about the nominal capacity.
  17. mfqd13

    Pumps in series

    Ok, so let's say that the 1st group of pumps as a volumetric flowrate of 200 m3/h and the 2nd group of 100 m3/h. Now, look at the new diagram (in attachment) where the 2nd consumer was substituted by an open tank. What should be the flowrate going through this line to the opened tank? It...
  18. mfqd13

    Pumps in series

    I forgot to attach the file...http://files.engineering.com/getfile.aspx?folder=d4fdcd01-f0f8-473c-889f-a69e51c1a648&file=Exp_diag.pdf
  19. mfqd13

    Pumps in series

    Hi, I have a specific situation to study but i would like to receive some opinions and i will put the question in a very basic way so that i can start from scratch. I've attached a pdf file with a simple drawing. Assumptions: - Both pair of pumps are working at 50Hz - Each pair of pumps has...
  20. mfqd13

    Thermodynamic properties of gas mixtures

    Dear chemlite, Thank you very much for the anwer. It was great! I will look deep in this and try to take a look to that book. Thanks!

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