What is the steady state surface temperature

Assignment Help Mechanical Engineering

Reference no: EM13710419

Let us revisit of homework assignment 2 wherein we analyzed and determined the steady state temperature of an electric heater. If the heater is made out of pure solid Aluminium (its density is 2702kg/m3 and its specific heat is 903J/kg/K) and if it was initially at room temperature (300K) determine how long it takes for the heater to reach 95% of its steady temperature value which we calculated it to be 72.4^oC. (Hints: The process is not steady state; the system (i.e. the heater) is a solid, hence incompressible. Start with the rate form of the 1st Law of thermodynamics to produce a differential equation with temperature and time being the variables.)

Problem: A cylindrical electric resistance heater has a diameter of 1cm and length of 0.25m. When water at 30^oC flows across the heater a heat-transfer coefficient of 15W/(m2^oC) exists at the surface. If the electrical input to the heater is 5W, what is the steady state surface temperature? of the heater?

Reference no: EM13710419

Questions Cloud

Series of two turbines and a heat exchanger : A series of two turbines and a heat exchanger are used to obtain shaft work from steam in a steady state process. The steam enters at 10bar and 250C, and exits the turbine at 3 bars. In the heat exchanger, the steam is heated back up to 250C, while t..

Find the net gravitational force on each of the masses : Four masses lie in a rectangular arrangement in the xy-plane. One mass is at the origin and the rectangular legs are parallel to the CS axes. Determine the net gravitational force on each of the masses

Biogas becomes flammable if the oxygen content exceeds : 100 kmol/h of biogas (75 mol% CH4 and 25 mol% CO2) is produced in a digester and is drawn off from the headspace under a slight vacuum and piped to a natural gas burning boiler. A slight leak develops in the pipe allowing air (79 mol% N2 and 21 mol% ..

Estimate how fast the baseball is moving : A 0.15 kg baseball collides with a 1.1 kg bat. The ball has a velocity of 43.5 m/s immediately before the collision. Estimate how fast the baseball is moving

What is the steady state surface temperature : A cylindrical electric resistance heater has a diameter of 1cm and length of 0.25m. When water at 30oC flows across the heater a heat-transfer coefficient of 15W/(m2oC) exists at the surface. If the electrical input to the heater is 5W, what is the s..

Determine the initial velocity of the mass : A 0.25 kg mass on a spring has a displacement x(t) = 0.2 cos(1.2 t - 0.15?). Determine the initial velocity of the mass

Exit temp of the air and the rate of heat transfer from air : Air enters the evaporator of an air conditioner at 14.7 psia, 90F, 200 ft3/min. R-134a at 20 psia, 30% quality enters at 4 lbm/min and leaves as saturated vapor at the same pressure. Find the exit temp of the air and the rate of heat transfer from t..

Changes in kinetic and potential energies are zero : Water in a vertical piston cylinder is heated at constant pressure of 10 bar. It is initially at 179.9 0C and has a specific volume of 0.1 m3/kg and is heated to a final specific volume of 0.248 m3/kg. Changes in kinetic and potential energies are ze..

What is the angular frequency of this oscillator : A block of mass m= .6 kg is attached to a spring with a natural frequency of oscillation f= 1.45 Hz. What is the angular frequency of this oscillator

User Account

All Pages