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  1. fuggeos

    sizing of circuit breakers

    on dpc's comments about the cable- the cable will be double armored, so no problem in supporting its own weight. I can get the capacitance/ft of the cable but how do i model that accurately? is it a pi configuration ( 2 Cs and 1 R) or a T, or something else? or can I just lump it in one R and...
  2. fuggeos

    sizing of circuit breakers

    thank you dpc and advidana for the comments. The power supply that we will be using is the universal input type, i.e., it will work from 90-260VAC input. we estimate the input power to the power supplies at 275 watts. Using #12 AWG, the calculated input voltage down there ( after the voltage...
  3. fuggeos

    sizing of circuit breakers

    We have an application where a universal input power supply with 48VDC output, 275 watts maximum input powering some instruments is to be supplied with 208VAC input via a long cable ( about 6500 ft' long ) using 2- #12AWG wires. The power supply will be mounted inside a subsea housing located...
  4. fuggeos

    liquid cooling

    Thank you all for the useful information. This forum is great! As regards 23562'c comments, I agree that it's better to do a real lab test but unfortunately, the stainless steel pressure housing is yet to be built. We're a small company with a limited budget for R&D so we're looking at some...
  5. fuggeos

    liquid cooling

    Hello everyone, I have an application where some electronics with a known heat dissipation of 50 watts, will be fully immersed in oil with a known thermal conductivity, k, in w/m-K, to aid in cooling. This electronics will be housed in a closed cylindrical stainless steel housing. The...
  6. fuggeos

    Mineral oil

    Hello, I am also involved in a project whereby some piece of electronics will be (hopefully) cooled by oil filling a pressure vessel that will be submerged in water. We're looking at DC200 silicon oil by Dow Corning, the 20 cs viscosity type. Shell Diala has also been used in these...
  7. fuggeos

    oil cooling of electronics

    I am trying to use Dow Corning DC200 silicon oil for oil cooling of electronics inside a stainless steel housing. The housing will be immersed in water, for an extended period of time. at about 30m below sea level. Can anybody please help in the equations to use, to determine the temperature...

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