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  1. Gianfranco

    Thermophysical properties of lubricants

    romke, 25362, CheTr Thanks for your useful obs/data. Gianfranco
  2. Gianfranco

    Italian Refrigeration Units

    Peter, you're welcome. Hi Quark, many thanks for your replay. Gianfranco
  3. Gianfranco

    Italian Refrigeration Units

    Dear Pkoestler, The refrigeration technical units used in Italy is the "Frigorie/ora" or Frig/h. Conversions of units are easy because 1 Frig = 1 kcal = 4,187 kJ. The units are now largely superseeded by IS. Frigorie units are used by old operators and maintenance people. Best...
  4. Gianfranco

    Thermal Properties of H20-LiBr

    Hi TCrush, First of all, see the LiBr-H2O's (h,%,t) diagrams and algorithmis on Ashrae's Handbook, Fundamentals, chap. 17. For details see the Final Report, RP919, Secondary Properties Of Aqueous Lithium Bromide Solutions, Robert Tapscott, Murdoch University, September 1996 - June 1997, TC...
  5. Gianfranco

    Heat Transfer Coefficients

    Hi ran13, The reference books on thermal conductivity of materials are edited by Touloukian-Ho, Purdue University. See the vol. 1 and vol. 2. Otherwise, look for trough the following gate: http://www.mayahtt.ca/tmwiz/default.htm Follow the instructions to come in to The Thermal Wizard where...
  6. Gianfranco

    lean manufacturing

    Hi MG74, I agree to Ivimike and GregLocock (BTW: Goldratt and followers are strongly against the lean approach. They propose to focus the improvements on the mainly in bottle necks and not on all the flow). I prepared a sheet/note on this subject, hoping it is useful for the forum. Gianfranco...
  7. Gianfranco

    Flagnoting every print dimension - bad drafting practice?

    Hi Umhoefer, Thanks! I fully agree with you. Your savvy do hope myself for the better future! May you repeat your answer at thread404-16033? Thanks again. Gianfranco PS. McLeod, you have open a lot of threads on the same subject. Now, could you summarize the answers given on others threads...
  8. Gianfranco

    Looking for Nusselt relationship

    Hi Packdaddy, For the purpose you said the correlation 8-73a, 8-74, or better 8-78, where you introduce the mu/muw parameter on Table 8-6, are enough to performe the sensitivity analysis around one working condition point (nominal). D UA ^ | 1 -| | | | |...
  9. Gianfranco

    Should have different part codes if they are interchangeable?

    Pavanje (Pav), MadMango (MM), Greg (GL), Many thanks for your interesting replays. Let me summarize your opinions and mine (GI) and let permit me expose a criteria to be used for setting the interchangeability of parts. 1. Two, or more "similar" parts, should have the same code or...
  10. Gianfranco

    Selection of alumium for casting

    Wil, Semisolid, Thanks for your advises: I bought the ASM Specialty Handbook, Aluminum and Aluminum Alloys. Fabrizio, I appreciated very much your availability but your E-mail address seems not correct: please, send to lopad@tin.it an E-mail. Fabrizio you have the tech. infos in the previous...
  11. Gianfranco

    Looking for Nusselt relationship

    Hi Packdaddy, Yes, if you have not the specific correlation, it is "always" correct to take into consideration the closer available correlation :-) Did you take into account the correlation for annular spaces? Have you decided what is the characteristic dimension: D or L? Gianfranco
  12. Gianfranco

    hair dryer heaters needed

    Hi ProEpro, You could looking for in the list below. Andy Baumen Associates, Ltd. APCOM Beswick Engineering Co., Inc. Blasdel Enterprises Inc. Bleckmann GmbH Bomac Electric Limited C.S.M. S.p.A. Caloritech, Inc. CEBI Deutschland Vertriebs GmbH Cristal Controls Ltd. Dalton Electric Heating Co...
  13. Gianfranco

    Should have different part codes if they are interchangeable?

    Hi all, 1. In your opinion, and experience, two or more interchangeable parts should have the same code or, viceversa, different codes? 2. Which is the definition of interchangeabiliy of parts? 3. Which are the aspects that are to taking into account to settle the interchangeablity of parts...
  14. Gianfranco

    Heat transfer rate between an underground concrete cistern and the soi

    Hi Jerre, We assuming no ground water movements in soil (no seepage) and that the cistern is an horizontal cylinder of diameter Do and leght L, buried ad a depth = X + Do/2. The heat flow from the cistern is: Q = ( tw - ta ) / Rt Where: tw = temperature of water (average along the...
  15. Gianfranco

    Condensating heat transfer coefficient

    Ciao Guido, There's a change of phase Gas -> Liquid :-) The heat transfer coefficient greatly increases because it involves the Latent Heat of Condensation (or change phase heat). The condensation heat transfer coefficients depend on the arrangement of the flow and orientation (horizontal...
  16. Gianfranco

    Friction Coefficients

    Hi dandan, See thread404-15296. Last month we discuss the subject in a deepest way. Please, before to do a new thread, I advise you to use the Search window for finding out if the subject has already been treated. Have a good reading. Gianfranco
  17. Gianfranco

    What is the EHD in heat transfer?

    Introduction to Electro Hydro Dynamic(EHD)in Heat Transfer EHD is a technique of augmentig of surface convective heat transfer coefficients (1), (2). For instance, experimental results have shown an increasing > 1000% in heat transfer coefficients for the refrigerant R-134a. The EHD...
  18. Gianfranco

    K ? of best insulator

    Nong, Please, could you specify why the insulation doesn't work well. In other words: from which point of view the rockwool are not satisfactory? - heat dissipated or flowed from the pipeline - temperature of the outside surfaces (for safety or evnvironmental aspects) - mechanical stability...
  19. Gianfranco

    Flagnoting every print dimension - bad drafting practice?

    Dear Friends, I'm seeing the "walls of castle" of the Engineering Departements growing up more and more :-) McLoad, you have lifted the "bridge" "for a moment": and this is not a good new for me. Please, take into account the following facts. The use of CIM and...
  20. Gianfranco

    Helically coiled heat exchanger

    Hello Bob, I confirm you that Dn = Dean Number = Re * (d/Dc)^0,50. The first Dn's definition was incomplete: sorry. I confirm that Fst = 16/Re The author Mr. Ito, Friction Factor for Turbolent Flow in Curved Pipes, J. Basic. Eng. 81, 123, 1959, uses Fst that is equal to the Fanning's Friction...

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