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  1. #1
    Completely NUTS UberBlue's Avatar
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    The most complete compendum of P/Q graphs. (BIG)

    LOOK HERE FOR THE GRAPHS

    I don't have enough post at the top to stuff everything in here.

    EDIT: Gah! The hotlinked images are tiiiiny. (I dunno... something with the coding here. Hotlinks work fine in the linked to thread.)
    Last edited by UberBlue; 09-20-05 at 06:58 PM.

  2. #2
    Completely NUTS UberBlue's Avatar
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    All Graphs; ALL.



    P/Q, ALL
    ________________________________________________



    Pump Efficiency (pip/pop) [ Greater than 4M head]
    ________________________________________________



    Overall Pump Efficiency (eip/pop) [ALL]
    ________________________________________________



    Point of Best Efficiency, ALL
    Last edited by UberBlue; 09-20-05 at 06:57 PM.

  3. #3
    Member {BC}Helix's Avatar
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    whew! nice. the comparison between tube sizes and flow rates is helpful. thanks.
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  4. #4
    Completely NUTS UberBlue's Avatar
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    whew!? Tell me about it. I spent three full days working on those bad boys.

  5. #5
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    Originally posted by UberBlue
    whew!? Tell me about it. I spent three full days working on those bad boys.
    Well done.
    Data manipulation and graph presentation is a thankless chore.
    However using Watts~ m(H2O)x lpm/6 did a rough check on a couple of values:-
    MCP1200 @ 10 lpm & 8.6m(H2O), W~ 14.3w.
    Eheim1048 @ 5lpm & 5.1m(H2O), W~ 0.9w

    Arithmetic error?

  6. #6
    Member slater3333uk's Avatar
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    Wow thats very useful!

    This is Uber Sticky meterial.

  7. #7
    Completely NUTS UberBlue's Avatar
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    Originally posted by Les56


    Well done.
    Data manipulation and graph presentation is a thankless chore.
    However using Watts~ m(H2O)x lpm/6 did a rough check on a couple of values:-
    MCP1200 @ 10 lpm & 8.6m(H2O), W~ 14.3w.
    Eheim1048 @ 5lpm & 5.1m(H2O), W~ 0.9w

    Arithmetic error?
    I dunno. My math skill are quite horrid. I can plug stuff into a formula and that's about it.

    I went about things the long way and used the formula-

    P = Q*H*s/366

    Where:

    Q = flow rate in M^3/h
    H = total head in meters
    s = specific gravity
    P = water horsepower

    Then it was a simple matter of converting wHP to watts. 1 wHP = 746.043 watts.

    (0.6m^3*8.58Mh*1)/366 = 0.014065574wHP = 10.49352285watts

    Thank god for Excel.

    Since you're the math guru, want the source data?

    EDIT: This just dawned on me. The water block resistance curves and the pump P/Q's intersect at the same flow rates on both types of charts. If the PBE data was bad, that wouldn't be the case.
    Last edited by UberBlue; 01-29-04 at 04:46 AM.

  8. #8
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    Originally posted by UberBlue
    ......
    Since you're the math guru, .............................?
    ...
    I am not a "math guru".
    I just do sums on beer-mats with the aid of a calculator(misplaced slide rule).
    However I suspect the equation is wrong:

    My "beer-mat" version:-
    Power(foot pounds/sec) = Head(ft) x Flow(lb/sec) =Head(3.281m) x Flow(8.33 gps) =Head(3.281m) x Flow(8.33 x 0.0734 m^3/h)
    = 2.006 x Head(mH2O) x Flow(m^3/h)
    Power(Horsepower) = 2.006/550 x Head(mH2O) x Flow(m^3/h) = 0.00365 x Head(mH2O) x Flow(m^3/h)

  9. #9
    Member vonkaar's Avatar
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    Great work ^_^.
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  10. #10
    Member Bald Shadow's Avatar
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    Awesome job UberBlue. I vote sticky, great graphs to use as a reference.

  11. #11
    Completely NUTS UberBlue's Avatar
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    Originally posted by Les56

    I am not a "math guru".
    I just do sums on beer-mats with the aid of a calculator(misplaced slide rule).
    However I suspect the equation is wrong:

    My "beer-mat" version:-
    Power(foot pounds/sec) = Head(ft) x Flow(lb/sec) =Head(3.281m) x Flow(8.33 gps) =Head(3.281m) x Flow(8.33 x 0.0734 m^3/h)
    = 2.006 x Head(mH2O) x Flow(m^3/h)
    Power(Horsepower) = 2.006/550 x Head(mH2O) x Flow(m^3/h) = 0.00365 x Head(mH2O) x Flow(m^3/h)
    Ahhh! My brain, it's tingling.

    And you're being modest. I've seen some of the work you've done @ procooling.

    The equation I used is a pump industry standard. A couple of people "who are in the know" about pumps checked my preliminary math and verified it correct.

    There are two versions of the equation I used, one for metric units and one for US units. And there is a slight difference between water horsepower and brake horsepower.

    Like I said, about the extent of my math ability is plugging numbers into an equation. I can find the equation I need and interpret the output of it, but as to what the equation is actually doing, it's usually beyond me. Like the "366" in my equation. I have no idea what that is. I just know I have to divide by it.

  12. #12
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    Thats awesome.

    What graphing software did you use for that? I could use that for my math class next semester.

    Thanks.

  13. #13
    Completely NUTS UberBlue's Avatar
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    Originally posted by 9mmCensor
    Thats awesome.

    What graphing software did you use for that? I could use that for my math class next semester.

    Thanks.
    Microsoft Excel. It's all about the formating.

  14. #14
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    Originally posted by UberBlue


    Microsoft Excel. It's all about the formating.
    Wow, those are the Best Excel graphs I've ever seen. Mine always look like junk : (

  15. #15
    Completely NUTS UberBlue's Avatar
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    There is nothing on an Excel graph you can't change with a right click.

  16. #16
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    nice work

  17. #17
    wow... nice job there UberBlue...


    *cough*give dis man a sticky!*cough*

  18. #18
    Completely NUTS UberBlue's Avatar
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    Thanks for the kind words.

    They're going to get better. I hopefully belive I have a crap load of radiator and waterblock data to soon put on there.

  19. #19
    Senior Member Cathar's Avatar
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    Now what would be nice would be an interactive calculator and grapher.

    Select the waterblock from a drop-down menu
    Select the pump from a drop-down menu
    Select the radiator from a drop-down menu
    Select the fan(s) from a drop-down menu
    Assume 2m of 1/2" tubing
    Type in a heat-load

    A whole mass of values and PQ curves comes out.

    Of course this requires engineering level data for the devices in question.

  20. #20
    Member Korndog's Avatar
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    i can do that in C++ but of course it would be in a dos console.
    actually made a very similar program that does the same thing but with machine productions for numbers in my 'programming for engineers' class, hehe. give me the tables and you'll get a program.

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