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 Sensors are fitted to measure the temperature of pipe walls for radial outward heat flow measurement. A Digital Temperature Controller is provided to have an automatic smooth control on required heat input to the heater as per user requirements. Further steady state of experiment is achieved in very less time as compared to manual control. Electronic energy meter is provided to measure the heat input.  

•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.