Identify the layer that provides the greatest resistance to, Ask an Expert

Engineering

problem 1: Figure below shows a scale drawing of the temperature profile through a composite plane wall.

a) Identify the layer with the largest thermal conductivity,
b) Identify the layer that provides the greatest resistance to the flow of heat.

State any suppositions made and describe your answers.

2200_temperature profile.jpg

Figure: Temperature profile via a composite plane wall

problem 2: A 3kW electric water heater is a cylindrical element containing outside diameter 10mm. The heat transfer between the heater and the surrounding water is 980W/m2K.

Find out the length of the heater if the surface temperature must not surpass 95^oC when the water is at 65^oC.

The element includes an electric resistance heater, diameter 2mm in the centre of the 10mm diameter stainless steel tube that has a wall thickness of 1mm. The gap between the resistance heater and within of the tube is packed with a ceramic material, Thermal conductivity 2W/mK.

Find out the temperature of the electric heater element. You might supppose that the heater element is at uniform temperature and the thermal resistance between the element and the ceramic is negligible. The thermal conductivity of the stainless steel is 16W/mK

View complete question

Mechanical Engineering, Engineering

Category:- Mechanical Engineering
Reference No.:- M9959

Have any Question?

Related Questions in Mechanical Engineering

Rework problem if the exit velocity profile is given bywhen

Rework Problem. if the exit velocity profile is given by when y is measure vertically from the center line of the water tunnel. Problem A two-dimensional object is placed in a 4-ft-wide water tunnel as shown. The upstrea ...

Suppose that the performance of a bjt transistor is

Suppose that the performance of a BJT transistor is entirely limited by emitter injection efficiency, which limits the d.c. beta, and base spreading resistance, which limits the bandwidth. Show that the gain-bandwidth pr ...

Problem -a piston at one end of a gas filled circular tube

Problem - A piston at one end of a gas filled circular tube of area S oscillates with real-valued velocity: U p (t) = U 1 cos(ω 1 t) + U 2 sin(ω 2 t) Note that two oscillation frequencies are present. The other end of th ...

Why is a combination of torque and angle measurement or

Why is a combination of torque and angle measurement or control so popular in mass production operations? What is meant by window control? What is meant by yield control in mass production applications? Does tightening a ...

On a certain day the barometric pressure at sea level is

On a certain day the barometric pressure at sea level is 30.1 in. Hg, and the temperature is 70°F. The pressure gage in an airplane in flight indicates a pressure of 10.6 psia, and the temperature gage shows the air temp ...

A room has design conditions of78 f db and 50 rh and a rscl

A room has design conditions of78 F DB and 50% RH and a RSCL = 18,000 BTUlhr and RLCL = 8000 BTUlhr. An air conditioning unit supplies 900 CFM of air to the room at 58 F DB and 56 F WB. Will the unit maintain the room de ...

1 the following data define the sea-level concentration of

1) The following data define the sea-level concentration of dissolved oxygen for fresh water as a function of temperature: T 0 8 16 24 32 40 01F 14.64 11.85 9.87 8.41 7.30 6.43 Use MATLAB to fit the data with (a) piecess ...

A liquid column of height h is confined in a vertical tube

A liquid column of height h is confined in a vertical tube of cross-sectional area A by a stopper. At t = 0, the stopper is suddenly removed, exposing the bottom of the liquid to atmospheric pressure. Using a control-vol ...

Blood glucose concentration is regulated primarily by the

Blood glucose concentration is regulated primarily by the controlled release of insulin in the pancreas. However, patients with Type I diabetes mellitus are incapable of producing insulin and therefore require shots of i ...

A linear spring k is to be designed to stop a 20-mg

a linear spring k is to be designed to stop a 20-mg railroad car traveling at 8km/h within 400 mm after impact. Find the smallest value of k that will produce the desired result.

4,153,160 Questions Asked
13,132 Experts
2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Recent Questions

Ask Mechanical Engineering Expert