Heat transfer coefficient at the surface of the base plate

Assignment Help Mechanical Engineering

Reference no: EM13703874

Consider a 1000-W iron whose base plate is made of .5 cm thick aluminium alloy 2024-T6 (p = 2270 kg/m^3, cp= 875 J/kg*K, alpha = 7.3 x 10 ^-5 m^2/s). The base plate has a surface area of .03 m^2. Initially, the iron is in thermal equilibrium with the ambient air at 22 degrees C. Taking the heat transfer coefficient at the surface of the base plate to be 12 W/m^2*K and assuming 85% of the heat generated in the resistance wires is transferred to the plate, determine how long it will take for the plate temperature to reach 140 degrees C. Is it realistic to assume the plate temperature to be uniform at all times?

Reference no: EM13703874

Questions Cloud

Design the helical compression spring for minimum mass : A helical compression spring made from hard drawn wire needs to be designed to fit inside a 50mm cylindrical cavity and there must be enough space inside the coils for a 20mm cylindrical guide rod.

Water temp in the inlet heavy any effect on required flow : A water pump increases water pressure from 10 psia to 50 psi. Determine the power input required in hp to pump 1.2 ft^3/s of water. Does water temp in the inlet heavy any effect on the required flow?

Estimate the heat flow per unit of area : A composite wall consists of a 1 mm-thick stainless steel plate (AISI 316), 2 cm of plywood, and 2 cm of low-density particle board. The stainless steel surface is maintained at 380 K while the other side loses heat to ambient air at 300 K, with conv..

Two series of cash flows described below equivalent : What value of G makes the two series of cash flows described below equivalent at an interest rate of 3% per year, compounded every 3 months? 22 annual deposits in the amount of $400. 11 annual deposits in the amount of $400 in the first year, and inc..

Heat transfer coefficient at the surface of the base plate : Consider a 1000-W iron whose base plate is made of .5 cm thick aluminium alloy 2024-T6 (p = 2270 kg/m^3, cp= 875 J/kg*K, alpha = 7.3 x 10 ^-5 m^2/s). The base plate has a surface area of .03 m^2.

What is the efficiency of the turbine : Water flows from the bottom of a large tank where the pressure is 120 psia to a turbine located 65 ft below the bottom of the tank that produces 40 hp. The pressure at the turbine exit is 42 psia and the water velocity is 36 ft/sec. The flow rate of ..

Determine the highest possible average flow velocity in duct : The 60-W fan of a central heating system is to circulate air through the ducts. The analysis of the flow shows that the fan needs to raise the pressure of air by 50 Pa to maintain flow. The fan is located in a horizontal flow section whose diameter i..

A power cycle has a thermal efficiency : A power cycle has a thermal efficiency of 40% and generates electricity at a rate of 100 MW. The electricity is valued at $0.08 per kW h. Based on the cost of fuel, the cost to supply Qin is $4.50 per GJ.

A weather balloon carries a mercury barometer : A weather balloon carries a mercury barometer in order to determine altitude as a function of flight time. At a particular moment, the barometer gives a reading of 558 mm. How high (in meters) is the balloon above standard sea level? (Assume mercury ..

User Account

All Pages