The present setup is designed and fabricated to study lagging phenomenon in pipes. It consists of three concentric pipes of small thickness as compared to diameter and closed with the help of two discs. Two different insulating materials fill the annuli between the cylinders. Inside the inner pipe, a Nichrome wire heater is placed axially. Temperature transmitters are fitted to measure the temperature of pipe walls for radial outward heat flow measurement. Electronic energy meter is provided to measure the heat input. It has an interfacing unit designed by Engineers along with Labview software. This educational software allows/enables user to log the real time experimental data and tabulate the experimental/sample reading according to the requirement of experiment. User have a control on data logging, printing the stored data and preparing spread sheets in Excel. Flexible graph plotting facility is also available in the software.

•An ENGLISH instruction manual consisting of experimental procedures, block diagram etc. will be provided along with the Apparatus.

•The whole set-up is well designed and arranged on a rigid structure painted with industrial PU Paint.

Experimentation/Learning Objectives

•To estimate the actual rate of heat transfer through the composite cylinders from the measured interface temperature of the two insulating materials with known thermal conductivities.

•To determine the effective thermal conductivity of the composite cylinder.

•To compare the theoretical temperature profile within the composite cylinders, with that of observed profile.

Utilities Required

•Electricity Supply: 1 Phase, 220 V AC, 50 Hz, 5-15 Amp combined socket with earth connection (Earth voltage should be less than 5 volts)

•Table for set-up support.

•Computer System: i-3 processor with DVD Drive, Windows 7/8, MS-Office pre-loaded. One USB slot required in PC for Data Acquisition Card.