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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.
You are required, as part of a small team, to design a remote controlled buggy that can be made to move forwards, backwards and from side to side. The basic buggy and motors are pr
A solid shaft of diameter d is taken in power transmission. Because of modification of existing transmission system, it is needed to replace the solid shaft by a hollow shaft of th
A semi-elliptic multi-leaf spring is needed for the suspension of the rear axle of a truck. It consists of two extra full-length leaves and ten graduated length leaves including th
with the aid of notes and sketches describe how you would transfer the design from a sheet of paper onto the wooden panel prior to carving
A steel dia 10 mm passes through a brass tube of internal dia 15mm and external dia is 25 mm. The bolt is tightened by a nut. The length of tube is reduced by 1.5mm and the length
Q. Requirements for vessels with thickness? The following additional requirements are applicable, as specified, to Carbon Steel and Low Alloy steel pressure vessels with main
EQUIPMENT FOR RESISTANCE WELDING-Protection A circuit breaker can be provided (this equipment can be rated for interrupted capacity) which will cater to a number of resistance
Draw and Illustrate all the inversions of a double slider crank chain. Get an expression for the length of a belt in 1. an Open belt drive ; And 2. a Cross belt drive.
difference between blow hole and porosity
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