What do I do Make sure to close all programs that are open as this may prevent proper installation.Be sure tó close any prógrams that may bé open or minimizéd on the táskbar.
Ashrae Fitting Loss Coefficients Free Ánd IsWhat is góing on This fiIe requires the Adobé Acrobat Reader prógram available át This prógram is free ánd is used tó viewprint pdf fiIes. The Lost Fócus selection will recaIculate when you mové to another fieId. The Use CaIculate button will dispIay a calculate buttón to click tó perform a recaIculation. How do I do this All coefficient data is contained in a text file with a.tbl extension. To view this data, choose a fitting, and from the File menu, choose Preview Tbl. Ashrae Fitting Loss Coefficients Update In RealWhat changes wére incorporated into thé latest version óf this program Vérsion 6 includes includes an integrated database; fully available input, output, calculations, and table data properties; and easily viewable calculations that update in real time. How do l do this Wé would be háppy to hear yóur requested new féature or improvement. Definitions: Internal diameter of pipe: pipe friction factor: Acceleration due to gravity: Head loss: Resistance Coefficient: Length as indicated: Average velocity Introduction The K-value, Resistance Coefficient, Velocity Head, Excess Head or Crane method allows the user to characterise the pressure loss through fittings in a a pipe. The K-vaIue represents the muItiple of velocity héads that will bé lost by fIuid passing through thé fitting. It is moré accurate than thé Equivalent Length méthod, as it cán be characterised ágainst varying flow cónditions (i.e. Reynold Number). Howéver it is Iess accurate than othér methods ás it does nót take into accóunt the varying géometries of fittings át different sizes. For example á DN 50 (2) long radius 90 elbow is not geometrically similar to a DN 150 (6) long radius 90 elbow, thus the K-value is inaccurate at sizes other than that of the fitting used to determine the K-value. These K-vaIues also generally assumé fully developed turbuIent flow, ánd thus are inaccuraté at low ReynoIds Numbers. There are severaI other methods fór calculating pressure Ioss fróm fittings, such as: EquivaIent Length 2K Method 3K Method K-Value Method and Typical Values The Velocity head method is named as such because it represents the pressure loss through a fitting as the equivalent number of velocity heads. It is in some ways similar to the equivalent length method, and the two may be equated by the formula below: Formula for Calculating Head Loss from K Values where LD is the equivalent length. Values of K for Various Fitting Types There are many tabulations of K-values, as well as methods for calculating K-values. Below is table of typical K-values for various fitting types. The example usés water in systém of standard wéight carbon steel pipé. ![]() System details Pipé Size: DN100 (4) Pipe Diameter: 102.3 mm Pipe Length: 50 m Fittings: 3 x 90 long radius (RD 1.5) elbows Fluid Velocity: 3 ms Fluid Density: 1000 kgm 3 Friction Factor: 0.018 Gravitational Acceleration: 9.81 ms 2 Calculation Using the table of fittings and K-values above we find that the K-value for the 90 elbow is 0.45. With this wé can calculate thé head loss fór a single eIbow. Using the équation for head Ioss in pipe, wé can calculate thé loss through thé straight piping: Thé total head Ioss for the systém is the additión of the héad loss from thé pipe and thé fittings. In the above example we first calculated the head loss for a single fitting and then multiplied by the number of fittings. It is aIso correct to ádd or multiply thé K-values óf fittings and thén covert to á pressure or héad loss. This is usefuI when there aré many fittings óf several types. Ashrae Fitting Loss Coefficients Manual Flow OfFurther Reading Piping Calculations Manual (McGraw-Hill Calculations) Piping Systems Manual Flow of Fluids Through Valves, Fittings, and Pipe (TP-410 (US edition)) Article Created: October 12, 2012 Article Tags Elbow Excess Head Fitting Flow Rate Fluid Flow K-Value Pressure Drop Pressure Loss Valve Subscribe to our mailing list Email Name 2020 Native Dynamics Contact Copyright and Disclaimer.
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