Engineering, 19.03.2020 08:20 kaylaelaine18

A 1200-W iron is left on the iron board with its base exposed to ambient air at 26°C. The base plate of the iron has a thickness of L = 0.5 cm, base area of A = 150 cm2 , and thermal conductivity of k = 18 W/m·K. The inner surface of the base plate is subjected to uniform heat flux generated by the resistance heaters inside. The outer surface of the base plate whose emissivity is ε = 0.7, loses heat by convection to ambient air with an average heat transfer coefficient of h = 30 W/m2 ·K as well as by radiation to the surrounding surfaces at an average temperature of Tsurr = 295 K. Disregarding any heat loss through the upper part of the iron,

(a) express the differential equation and the boundary conditions for steady one-dimensional heat conduction through the plate,

(b) obtain a relation for the temperature of the outer surface of the plate by solving the differential equation, and

(c) evaluate the outer surface temperature.

Answers: 3

Show answers

Another question on Engineering

Engineering, 04.07.2019 18:10

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

Answers: 1

Answer

Engineering, 04.07.2019 18:10

Abrake has a normal braking torque of 2.8 kip in and heat-dissipating cast-iron surfaces whose mass is 40 lbm. suppose a load is brought to rest in 8.0 s from an initial angular speed of 1600 rev/min using the normal braking torque; estimate the temperature rise of the heat dissipating surfaces.

Answers: 3

Answer

Engineering, 04.07.2019 18:10

Water in a partially filled large tank is to be supplied to the roof top, which is 8 m above the water level in the tank, through a 2.2-cm-internal-diameter pipe by maintaining a constant air pressure of 300 kpa (gage) in the tank. if the head loss in the piping is 2 m of water, determine the discharge rate of the supply of water to the roof top in liters per second.

Answers: 3

Answer

Engineering, 04.07.2019 18:10

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.

Answers: 3

Answer

You know the right answer?

A 1200-W iron is left on the iron board with its base exposed to ambient air at 26°C. The base plate...

Questions