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  1. #1

    Hvac Trial On Ship

    Can I consider Electrical bulb watt as a replacement of human load

  2. #2
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    Btu's are btu's.

  3. #3
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    Just sensible not latent.

  4. #4
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    As long as your design is right to take care of the latent (air flow, coil design, coil temp) I would think you could substitute for load testing. Not sure though. I don't design them, I just fix em when they break.

  5. #5
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    Quote Originally Posted by jemawalton View Post
    As long as your design is right to take care of the latent (air flow, coil design, coil temp) I would think you could substitute for load testing. Not sure though. I don't design them, I just fix em when they break.
    Correct but to do right design you need to know the SHR to match the equipment to.

  6. #6
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    while in school i remember doing heat load calcs for a room full of disco dancers... the human heat load was something like 917 btu/ hr/ person...

    i would have to go back and look at my notes...

    are the bodies in the room hard at work???

  7. #7
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    Quote Originally Posted by aniruddha View Post
    Can I consider Electrical bulb watt as a replacement of human load
    I would not use it as a replacement, but figure your btus for both. Like ChillerRob said, there is a multiple for lights, people, activity (light work will be less btus than an aerobic center), windows (N,S,E,W), any server equip etc. I think you get what I'm saying. Hope this can help.
    Sic Semper Tyrannis.

  8. #8

    Hvac Trial

    We have to give a trial for AC sytem on coast guard ship .As the customer can not put 135 crew on board at the time of trial .Can it advisable to put on electrical bulb of equivalent to Human heat load.Design temp is 25 degree celcius and RH 60%

  9. #9
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    yes you could do that
    with some research you should be able to find the human factor...

    i still have not verifed the 917 btu/ hr...

    the math should look like this... i think...

    917 btu/ hr/ person X 135 person = 123,795 btu/ hr

    123,795 btu/hr divided by 3.41 btu/watt = 36303.5 watts/hr

    so 36303.5 divieded by 100watt light bulb = 363, 100 watt light bulbs/ hr

    so if you have 302 amps of single phase 120 that you could use you may have an artificial load...

    that is not very realistic but looks like you have a 10.3 ton addtional load with the room at maximum occupancy...

    if i am in left field someone help me out... thanks...

  10. #10

    Trial of AC SYSTEM

    I have observed that with bulb is on on board the RH comes very low as latent heat is not being added as it is only sensible heat from bulb so putting bulb may not be a correct idea .

  11. #11
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    light bulbs don't breath and sweat.

  12. #12
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    Quote Originally Posted by t527ed View Post
    light bulbs don't breath and sweat.
    so then the question is; "How many psychatrists does it take to change a light bulb?" Only one but it takes a long time and the bulb really has to want to change
    Last edited by adrianf; 04-04-2008 at 11:45 AM.

  13. #13
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    Frown

    Quote Originally Posted by aniruddha View Post
    We have to give a trial for AC sytem on coast guard ship .As the customer can not put 135 crew on board at the time of trial .

    Can it advisable to put on electrical bulb of equivalent to Human heat load. Design temp is 25 degree celcius and RH 60%
    135 People
    300 BTU/ Person
    40,500 BTUh Sensible Load

    3,413 BTUh /kw
    11.87 kW Sensible Load

    5,000 Watts = 50 x 100 w light bulbs

    You could boil water using 1 KW in several location to
    simulate latent load of ~ 40,000 BTU.

    That's just for a brain-storming starter

    Test set-up needs a LOT OF DEFINITION
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

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