what is the thermal conductivity coeficient of copper wire at 40 clesius or 150 celsius at 40 gauge pressure?
Appendix C – Wire Properties The wire properties used for the calculations are listed here rather than in a separate design note. Material Properties Material Thermal Conductivity (W/cm/K) Electrical Resistivity (Ohm-m) Copper 4.0 1.7e-08 Manganin 0.15 4.6e-07 Teflon 0.003 -- The properties tabulated are average values over the temperature range 60-300K. For some calculations the temperature dependence of thermal conductivity for Teflon and G-10 was used. The formulae used were: k(Teflon) = 0.0013 + 0.00062(T/100) W/cm/K k(G10) = 0.0018 + 0.0018(T/100) W/cm/K These values are accurate to perhaps 30%. Wire Dimensions The standard teflon-coated manganin ribbon cable is 30 gauge (conductor 0.255 mm diameter, 0.0503 mm2 area). The copper ribbon cable is 28 gauge (conductor 0.321 mm diameter, 0.0804 mm2 area). The form of the ribbon cable is wires coated with insulation with a connecting strip between wires. The diameter of the coated wires for the 30 gauge cable is 0.73 mm, which indicates an insulation thickness of ~0.24 mm. This was assumed to apply to the 28 gauge cable as well. The dimensions for stranded wire are somewhat larger; the actual cross-sections of copper are 10-20% higher and there fill factor of the strands is also less than 100%. The differences in performance between single-conductor and stranded wire are less than other uncertainties. For the purposes of all calculations the individual wires were assumed to be isolated – the connections between conductors in the ribbon cable were ignored, as well as any effect on viewing factors for radiation, etc. Circuit Board Information Circuit boards (for cold-stationing) can be made up with in a variety of properties. For simplicity, the calculations considered fairly standard properties. A standard copper layer of 1 oz/sq ft corresponds to a layer thickness of 0.036 mm. A standard thickness (2-layer board) is 1/16 inch, or approximately 1.6 mm.
Thermal Conductivity Of Copper Wire
You obviously have no idea what you're doing. Do some research on basic electrical theory and try again.
