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  • CMU Blast wall design for HUD Construction | Eng-Tips
    I am working on a Department of Housing and Urban Development (HUD)project where I need to design a 6 ft high concrete masonry unit (CMU) blast walls The requirement of the blast wall (and its material) is as follows, "Thermal heat flux exposure threshold of 450 BTU hr ft2 for people in open
  • Thermal Resistance | Eng-Tips
    "The thermal resistance often comes with the units, Km2 W " This is technically incorrect Thermal resistance is the inverse of thermal conductance, which is thermal conductivity (the inverse of thermal resistivity) multiplied by area length That makes thermal resistivity m*K W, and thermal resistance K W Thermal resistance is the temperature rise incurred by the heat flow, so something
  • Resistance on heat sink fins??? | Eng-Tips
    Dear all, I am working on a liquid cooling system and have to deal with resistance on base,fins and fluid flow I found the traditionally used equation for fin resistance doesnt have any dependance on fin materials thermal conductivity Isit that if i use a plastic fin which has a very
  • Junction vs. Case Temperatures | Eng-Tips
    and of course the power dissipated The temperature difference between junction and case is the thermal resistance junction-to-case (degC W) multiplied by the power in the chip (Watts)
  • Mutual Thermal Resistances between Pipe Layers | Eng-Tips
    I need to find this mutual thermal resistance between the cylindrical layers (i e between insulation and water) The aim here is to find the temperature of insulation (as well as steel and ground) so to consider the thermal inertia for the flow through a buried insulated pipe
  • Electrical Duct Bank Calcs | Eng-Tips
    The trick is in determining RCA, the effective thermal resistance between the conductor and surrounding ambient This effective resistance is the result of several complicated formulas that take depth into account A good book on the subject is Rating of Electric Power Cables, George J Anders, McGraw-Hill IEEE Press, 1997
  • RTDs | Eng-Tips
    An increase in resistance (loose or corroded connection) in the 3rd wire of a 3 wire RTD circuit that does lead wire compensation drives the indicated temperature lower A water-flooded field junction box could conceivably reduce the excitation current from the AI circuit by losing some current through a ground loop fault
  • CT Saturation | Eng-Tips
    On your side note, sounds like you're talking about the thermal current rating, which is the 1 sec withstand of the CT and always expressed in primary current This value varies widely with type of CT and manufacturer
  • fuse protection for resistive heater load | Eng-Tips
    I bet the resistance wire runs much hotter than this: without a decent temperature differential, you're not going to be able to drive heat through the thermal resistance of the insulating packing A
  • Bushing Thermal Expansion | Eng-Tips
    A metallic bushing with high thermal conductivity will operate at a very similar temperature to the housing A plastic bushing with low thermal conductivity is going to have a much higher temperature gradient across the bushing Assuming it's all hot is a safe design consideration





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