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  1. #1
    Join Date
    Jul 2009
    Location
    South Carolina
    Posts
    3,192

    Online Manual J load calculator

    After about two years I finally got my online Manual J load calculator finished.
    Its been a fun project so far & I hope someone can get some use out of it besides myself. I also plan to add some data for Canada in the near future.
    I'd appreciate any ideas or feedback from anyone.
    The site is at: http://www.loadcalc.net
    Gary
    -----------
    http://www.oceanhvac.com
    An engineer designs what he would never work on.
    A technician works on what he would never design.

  2. #2
    Join Date
    Jun 2011
    Location
    Houston area
    Posts
    1,493
    Thanks Gary! May I offer some constructive criticism?
    The picture in my avatar is of the Houston Ship Channel and was taken from my backyard. I like to sit outside and slap mosquitos while watching countless supertankers, barges and cargo ships of every shape and size carry all sorts of deadly toxins to and fro. It's really beautiful at times.....just don't eat the three eyed fish....

    `. .` .>(((>

    `... `. .` .>(((>

    .` .>(((>

    LMAOSHMSFOAIDMT

  3. #3
    Join Date
    Apr 2010
    Location
    Red Deer, Alberta
    Posts
    653
    Quote Originally Posted by garyed View Post
    After about two years I finally got my online Manual J load calculator finished.
    Its been a fun project so far & I hope someone can get some use out of it besides myself. I also plan to add some data for Canada in the near future.
    I'd appreciate any ideas or feedback from anyone.
    The site is at: http://www.loadcalc.net
    Hi Gary...
    I tried to enter my house specs and could not find anything even approaching it... I'd suggest increasing roof R values up to about R70 or so (and above), and at least R50 (and/or above) for walls. Otherwise, looks like you are doing something good, give yourself a raise!

  4. #4
    Join Date
    Jul 2009
    Location
    South Carolina
    Posts
    3,192
    Quote Originally Posted by Cooked View Post
    Thanks Gary! May I offer some constructive criticism?
    Definitely, I would appreciate hearing it.
    Gary
    -----------
    http://www.oceanhvac.com
    An engineer designs what he would never work on.
    A technician works on what he would never design.

  5. #5
    Join Date
    Dec 2003
    Location
    Citrus County, Florida
    Posts
    1,517
    drop down menus for constructions are cut off. Using this calculator, one would need to use manual J book to look up construction numbers, right?

    nice job, I'm sure you have a lot of time in this project.
    Doug

  6. #6
    Join Date
    Jul 2009
    Location
    South Carolina
    Posts
    3,192
    Quote Originally Posted by enb54 View Post
    Hi Gary...
    I tried to enter my house specs and could not find anything even approaching it... I'd suggest increasing roof R values up to about R70 or so (and above), and at least R50 (and/or above) for walls. Otherwise, looks like you are doing something good, give yourself a raise!
    Thanks, I'll try to find some higher R-values to add.
    Gary
    -----------
    http://www.oceanhvac.com
    An engineer designs what he would never work on.
    A technician works on what he would never design.

  7. #7
    Join Date
    Jul 2009
    Location
    South Carolina
    Posts
    3,192
    Quote Originally Posted by Gunslinger View Post
    drop down menus for constructions are cut off. Using this calculator, one would need to use manual J book to look up construction numbers, right?

    nice job, I'm sure you have a lot of time in this project.
    Thanks for the input,
    No, you shouldn't need to use any manual J book.
    Can you tell me what browser & OS versions you're using.
    Not all browsers work the same, depending on the OS & version numbers there are sometimes features that can be left out or displayed different.
    Sometimes its easily fixable & sometimes not. I've already made some adjustments to accommodate some different browsers but its hard to test every one so I would appreciate your info.
    Gary
    -----------
    http://www.oceanhvac.com
    An engineer designs what he would never work on.
    A technician works on what he would never design.

  8. #8
    Join Date
    Dec 2003
    Location
    Citrus County, Florida
    Posts
    1,517
    you have mail. I am using windows IE
    Last edited by Gunslinger; 12-20-2011 at 02:51 PM. Reason: added info
    Doug

  9. #9
    Join Date
    Sep 2007
    Location
    Boise, ID
    Posts
    4,261
    Nice job. I might try comparing it against Trane Trace or Carrier HAP when I have some spare time.
    If a nation expects to be ignorant and free, in a state of civilization, it expects what will never be. (Thomas Jefferson 1816)

  10. #10
    Join Date
    Jul 2009
    Location
    South Carolina
    Posts
    3,192
    Quote Originally Posted by Gib's Son View Post
    Nice job. I might try comparing it against Trane Trace or Carrier HAP when I have some spare time.
    I'd be curious to see how they compare.
    The one thing I know I left some room for error is the duct load. I used a default spider duct system instead of allowing for the actual duct area. The problem with making things simple is it makes things less accurate also.
    Gary
    -----------
    http://www.oceanhvac.com
    An engineer designs what he would never work on.
    A technician works on what he would never design.

  11. #11
    My husband and I are building a house ourselves, contracting out minimally--stuff like the concrete and the HVAC. In order to pull building permits, we have to have a manual J load calculation. In trying to use yours, in the "Floor" options, I discovered there's no choice for a "floor over a basement." Are any of the options you have listed comparable? We're doing a 1550 sq ft house over a full basement, 8 ft below grade/9ft ceilings, which we will finish at some point on down the road. Any help/insight you can provide would be appreciated!

  12. #12
    Quote Originally Posted by garyed View Post
    After about two years I finally got my online Manual J load calculator finished.
    Its been a fun project so far & I hope someone can get some use out of it besides myself. I also plan to add some data for Canada in the near future.
    I'd appreciate any ideas or feedback from anyone.
    The site is at: http://www.loadcalc.net
    My husband and I are building a house ourselves, contracting out minimally--stuff like the concrete and the HVAC. In order to pull building permits, we have to have a manual J load calculation. In trying to use yours, in the "Floor" options, I discovered there's no choice for a floor over a basement. Are any of the options you have listed comparable? We're doing a 1550 sq ft house over a full basement, 8 ft below grade/9ft ceilings, which we will finish at some point on down the road. Any help/insight you can provide would be appreciated!

  13. #13
    Join Date
    Jul 2009
    Location
    South Carolina
    Posts
    3,192
    Quote Originally Posted by catblackmore View Post
    My husband and I are building a house ourselves, contracting out minimally--stuff like the concrete and the HVAC. In order to pull building permits, we have to have a manual J load calculation. In trying to use yours, in the "Floor" options, I discovered there's no choice for a floor over a basement. Are any of the options you have listed comparable? We're doing a 1550 sq ft house over a full basement, 8 ft below grade/9ft ceilings, which we will finish at some point on down the road. Any help/insight you can provide would be appreciated!

    Since I haven't gotten into basements yet on the program the closest thing to unconditioned basement would be "closed or vented crawl space" with whatever insulation you plan to have. I would recommend that you get an HVAC pro to do a loadcalc to be safe that your system is sized correctly. Even using the same program, rarely do two people come up with the same numbers on the same house. It takes a basic understanding
    to do a proper loadcalc no matter what program you use & there's never a guarantee that the program itself doesn't have errors.
    Gary
    -----------
    http://www.oceanhvac.com
    An engineer designs what he would never work on.
    A technician works on what he would never design.

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