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    Flow Rate Calculation

    Is their anyway to change the calculation method that revit uses to calculate Cold water flow rates? All the "architecture" already exists for the current "Fixture Units" method, I would just need to change the actual calculation used to suit the British Standard.

    #2
    Yes its possible.. but you will need to do a bit of C# programming and make an add in.
    There is the possibility to replace the pipe/duct calculation servers with your own. Theres some info on this here;
    I managed to get this working for tapwater using dutch 'Tapeenheiden' instead of Fixture Units.

    It works, but the only examples I could find where from 2013 and I had to strip it right down to the minimum because so many things where old and no longer worked with the API. I dont have a lot of programming experience so its amateur stuff... so feel free to have a look and copy it if you like.
    Its a Visual Studio 2015 project. I suggest you download the full example too and start with that for your own calcs.

    (BTW the actual WFU calculation is ridiculously simple, it just looks up a table. If you can get the rest of the add in working, just replace that bit with your own formulas.)

    I gather from the lack of available examples that almost no one has tried this...


    EDIT: Als je wil toch de berekeningen gebruiken volgens NTR3215, je zal een geschikte family moeten maken. TE SE en constant debiet zijn door hetzelfde WFU parameter gestuurd als volgt;
    Attached Files
    Last edited by josephpeel; August 10, 2017, 12:52 PM.
    "One must imagine Sisyphus happy." Albert Camus - "The innovator has for enemies all those who have done well under the old conditions, and lukewarm defenders in those who may ​do well under the new." Nicolo Machiavelli -"Things that are too complex are not useful, Things that are useful are simple." Mikhail Kalashnikov

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      #3
      I have downloaded your attached file thank you. How do I install this/add it into Revit?

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        #4
        Put the compiled .addin and .dll files in the folder C:\ProgramData\Autodesk\Revit\Addins\2016 (Or other version.)
        Then when you open revit it will run as a service (There is no AddIn button) and you can select it in Mechanical Settings

        Note that if you make changes (In Visual Studio), build and overwrite the files, you still need to close revit and open it again for it to update. Which makes debugging a bit more tedious than a normal addin
        Last edited by josephpeel; August 10, 2017, 01:35 PM.
        "One must imagine Sisyphus happy." Albert Camus - "The innovator has for enemies all those who have done well under the old conditions, and lukewarm defenders in those who may ​do well under the new." Nicolo Machiavelli -"Things that are too complex are not useful, Things that are useful are simple." Mikhail Kalashnikov

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          #5
          I have attached an image showing the files I have placed in the below directory. Is this correct?

          F:\Program Files (x86)\Autodesk Revit 2015\Revit MEP 2015\AddIns\MEPCalculation
          Attached Files

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            #6
            Dear Joseph,

            I'm trying to adapt the User Flow conversion to the spanish Normative.
            Do you know if there's any way of knowing wich Plumbig Fixture has the lowest flow in the system?

            [email protected]
            www.revitmep.es
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