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  1. Miran Fernando

    Mathematical modelling of heating of air in enclosure

    Hello all, I’m looking for some guidance on a calculation that I’m trying to do. I posted a similar recent thread titled 'Heating of air in enclosure - calculation and experiment discrepancy'. This question is in relation to the same device as the one in that other thread, but the enclosure is...
  2. Miran Fernando

    Heating of air in enclosure - calculation and experiment discrepancy

    Hello everybody, I would like feedback please on a large discrepancy between a theoretical calculation and an experimental measurement I have taken. I ran a 470 Ohm 5 Watt ceramic (at 50 V and 0.1 A, both confirmed using a multimeter) resistor inside of an 8 litre insulated cooler box and...
  3. Miran Fernando

    Flow rate heat transfer confusion

    Hello, I try to use equation to calculate how much flow rate needs to be to removed heat from apparatus, but I confuse myself. I thought more flow means more heat taken away? I take this equation: Qdot = Vdot * cp * ρ * ΔT. I rearrange to find Vdot: Vdot = Qdot / cp * ρ * ΔT If Qdot kept...
  4. Miran Fernando

    Cooling of box and apparatus inside

    Hello, New user here, excited to draw on knowledge of others. I have a small box to contain a science apparatus. The science apparatus needs to be kept cool and has inlet and outlets for fluid tubes. Sorry for this question if it is silly: do I need to cool the inside of the box as well? If I...

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