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Florescent light heat load

helgy_2
helgy_2 Member Posts: 14
in THE MAIN WALL
Does anyone have a web sight or other good information sourse were I could find florescent heat loads. I'm in the process of sizing a comm. job that has a greater number than usual. Any information would be great.

Thanks, Helgy

Comments

  • JimGPE_3
    JimGPE_3 Member Posts: 240


    The catalog should list the lamp Watts and number of lamps per fixture. Add some for the balast (15%) and add 'em up. Total watts x 3.41 = BTU/Hr.

    Having said that, if you need exact numbers, post the type of lamp (T-8, T-12, etc.), the length of the lamp, the number of lamps per fixture, the type of balast (electronic, magnetic) and post again. I can get you real close.
  • Matt Undy
    Matt Undy Member Posts: 256


    Woudln't power factor of the ballast also be significant in the ballast loss calculations? Doesn't a portion of tht also become heat in the ballast and wiring?

    Matt
  • JimGPE_8
    JimGPE_8 Member Posts: 15
    Hoboy...

    You're gonna need a sparky for that answer. I'm just an airhead. But the power factor would be included in the balast multiplier. The lamps, of course, don't have a power factor.
  • Matt Clina
    Matt Clina Member Posts: 90
    ASHRAE Fundamentals

    The ASHRAE Fundamentals book has formulas for this in the cooling load chapter (Chapter 33 maybe?). I am out of my office, so I can't look it up right now, but it includes factors for number of hours per day that the lights are on, whether the fixtures are ventilated to above a suspended ceiling, efficiency of the ballasts, etc..
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