Calculate the thickness of insulation, Mechanical Engineering

A hot gas at 300°C flows through a long metal pipe 100mm outer diameter and 3mm thick. From the standpoint of safety and energy conservation, mineral wool insulation of thermal conductivity 0.052W/m K is wrapped around it so that the exposed surface of the insulation is at a temperature of 50°C. Calculate the thickness of insulation required to achieve this temperature if inner heat transfer coefficient 29W/m2K and outer heat transfer coefficient is 12W/m2K and the surrounding air temperature is 25°C. Also calculate the corresponding heat loss rate per unit length.

Asbestos insulation of thermal conductivity 0.2W/m K is put on a steel pipe of 16mm inner diameter and 20mm outer diameter. Hot water at 90°C flows through the pipe and the heat transfer coefficient is 500 W/m2 K. Heat is lost from the outer surface by natural convection to surrounding air at 30°C and the heat transfer coefficient is 10 W/m2 K. Calculate the heat loss rate per meter length of the pipe for no insulation and insulation thicknesses of 5, 10, 20, 30, 40 and 50mm. Plot the results and explain the variation obtained.

Posted Date: 3/14/2013 6:44:38 AM | Location : United States

Related Discussions:- Calculate the thickness of insulation, Assignment Help, Ask Question on Calculate the thickness of insulation, Get Answer, Expert's Help, Calculate the thickness of insulation Discussions

Write discussion on Calculate the thickness of insulation
Your posts are moderated
Related Questions
Ask what is hazard and how it is occuring

a) Illustrate with neat and clean diagram the measurement of brake power by prony brake Dynamiter OR Belt transmission type Dynamiter. b) A torsion dynamometer is fixed to a pro

First Law for Closed System Undergoing Change of State - thermodynamics: In accordance to first law, when system undergoes a thermodynamic process (change of state) heat and w

what is the formula for measuring the safe speed to drive for a cyclist

Q. What do you understand by Myocardial Oxygen Uptake? VO 2 max = Maximum C.O x Maximum A-V Oxygen difference. It is the maximum amount of oxygen that the person can use du

(a) Show by use of Buckingham's Pi-Theorem that the velocity through an orifice is given by V = √2gH  f D/H , M/ΡVH , σ/ΡV 2 H . Where H is the head causing flow, D is the diame

(a) Differentiate between carnot Heat pump and carnot Heat engine. What is the basic cycle for a carnot Heat pump ? Explain it. (b) A reversible heat engine delivers 0.6 K at po

How is metal removed in metal cutting ? Explain the process by giving simple model to explain the metal removed process. What are the different conditions that could allow a con