List of Heat Transfer Lab. Equipment’s PCC-ME502L:

01.Composite wall Apparatus

 

This apparatus is utilised to obtain the heat transfer rate through different materials. The unit consists of a three slabs of different materials namely mild steel, press wood and Bakelite. Mica heater is provided to supply heat input across these composite walls. Total heater assembly comprises of a heater bound between two aluminium plates. On both side of this heater identical structures of composite wall are placed. Thermocouples are provided at proper position in the composite wall to record desired inside temperature of composite wall

 

02.  Thermal conductivity of Metal bar Apparatus

 

This apparatus is used to measure the temperature gradient along the length of the metal (copper) rod and to determine the co-efficient of thermal conductivity of the metal (copper). It consists of a copper rod one end of which is heated by an electric heater and the other end projects inside the cooling water jacket. The middle portion of the rod is thermally insulated from the surroundings using asbestos rope. The temperature of the rod is measured at four different locations along its length with the help of thermocouples.

 

 

 

 

 

03.  Thermal conductivity of Insulating Powder Apparatus

 

This apparatus helps to determine thermal conductivity of an insulating powder. After experiment performance, the students must be able to understand derivation of steady state heat conduction in hollow sphere and evaluation of thermal conductivity of insulating powder and its comparison with theoretical value. The apparatus consists of two thin walled concentric copper spheres. The inner sphere houses the heating coil. The insulating powder filled in the annular gap between two copper spheres, takes the form of a hollow sphere. The power supply to the heating coil is adjusted by dimmer-stat and it is measured by voltmeter and ammeter. The ten thermocouples are used to measure the temperature at inner and outer surface of insulating powder sphere. The four thermocouples, numbered as T1 to T4 are embedded on outer surface of the inner sphere and six thermocouples, numbered as T5 to T10 are embedded on inner surface of the outer sphere.

 

 

04.  Natural Convection  Apparatus

 

This apparatus helps to determine overall heat transfer coefficient and local transfer coefficients in natural convection at various heat transfer rates. The unit consists of a vertical brass pipe heated by a cartridge heater inside it. The pipe looses heat to atmosphere by natural convection. It is fitted in an enclosure to provide undisturbed natural convection currents. Thermocouples are attached on the pipe to measure local temperatures. Heater input is measured on voltmeter and ammeter.

 

 

 

 

 

 

 

This apparatus helps to determine the average surface heat transfer coefficient of a pipe by forced convection and students can compare heat transfer coefficient for different airflow rates and heat flow rates. The apparatus consists of blower unit fitted with the test pipe. Nichrome wire heater surrounds the test section. Four Temperature Sensors are embedded on the test section, two placed in the air stream at the entrance and exit of the test section to measure the inlet and outlet air temperature. Test pipe is connected to the delivery side of the blower along with the orifice to measure flow of air through the pipe. Constant heat flux is given to pipe by an electric heater through a variac and measured by Digital Voltmeter and Digital Ammeter.

 

 

 

 

This apparatus is used to calculate the rate of heat transfer, LMTD and overall heat transfer co-efficient. The apparatus consists of fabricated shell, inside which tubes with baffles on outer side are fitted. The present set up is a 1-2 heat exchangers, with cold water flows through shell. Valves are provided to control the flow rates of hot and cold water. Flow rates of hot and cold water are measured using Rotameters. A magnetic drive pump is used to circulate the hot water from a re-cycled type water tank, which is fitted with heaters and Digital Temperature Controller.

 

 

 

 

 

 

This apparatus helps to demonstrate the super thermal conductivity of Heat Pipe and to compare its working with best conductor i.e. Copper pipe & Stainless steel pipe as same material of construction. This apparatus consists of three identical cylindrical conductors In respect of geometry. One end of these is heated electrically while there are small capacity tanks acting as heat sinks at the other end. The unit consists of a heat pipe a copper pipe and a stainless steel pipe. Temperature sensors are embedded along the length to measure the temperature distribution and the heat transfer rate is noted in terms of the temperature rise in the heat sink tanks.