Estimate the radiant heat transfer from the wire you can

Assignment Help Mechanical Engineering

Reference no: EM13624739

1) A 10-cm long and 20-cm wide circuit board is covered with 100 closely spaced chips, each generating heat at a rate of 0.08 W and transferring it by convection to the surrounding air at 25°C. Heat transfer from the back surface of the board is negligible. What is the average surface temperature of the chips? The convective heat transfer coefficient on the surface of the board is 10 W/(m^2 K) and radiative heat transfer is negligible.

2) Toasters, blow dryers, and electric space heaters do their jobs via electric resistance heating: when electricity flows through a high-resistance wire, the temperature of the wire goes up, and heat is dissipated from the wire to the surroundings. A particular toaster uses 20 feet of a Nichrome resistance wire to cook toast. The diameter of the wire is 0.0285 inches.

a. Estimate the radiant heat transfer from the wire. You can assume that the surface temperature of the wire is approximately 750°C and that the wire is a thermal black body.
b. About how much current will this toaster use when connected to a 110 V power source?

Reference no: EM13624739

Questions Cloud

By what factor would the tension in a violin string have to : by what factor would the tension in a violin string have to change to tune it from baroque pitch of 415 hz to the

Determine the radius of curvature of the trajectory and the : a ball is released with the initial velocity of 80 ftsec at an angle of 35 degrees. determine the radius of curvature

When the three blocks are released from rest they : when the three blocks are released from rest they accelerate with a magnitude of 0.660 ms2. block 1 has mass m block 2

Estimate the radiant heat transfer from the wire you can : 1 a 10-cm long and 20-cm wide circuit board is covered with 100 closely spaced chips each generating heat at a rate of

A ray of light in the coating is incident on the : a glass lens has a scratch-resistant plastic coating on it. the speed of light in the glass is 0.607c and the speed of

A recent study of how americans get to work revealed the : a recent study of how americans get to work revealed the following dataurbanruraltotalautomobile400200600public

If the data set was split into 5 sets 4 s long each what is : an accelerometer was used to measure the vibrations of machinery. the sensor output was acquired during an experiment

He would like a prescription for contact lenses to serve : a farsighted man uses eyeglasses with a refractive power of 2.15 diopters. wearing the glasses 0.02 m from his eyes he

User Account

All Pages