DESCRIPTION:-

The apparatus consists of a pair of M.S. plates, Bakelite, brass/aluminum. These plates in series on either side of the heater form a composite wall. The whole unit is clamped in a frame, which can be viewed through the Perspex sheet. The thermocouple tapings enables us to find out the conductivity and resistance of the composite walls.

Technical Details:-

• Heater- Mica healer of dia. 250 mm.

• M.S. plates of thickness 25mm & dia. 250mm.-2 nos.

• Bakelite plates of thickness 10mm & dia. 250mm.-2 nos.

• Brass/Aluminum plates of thickness 15mm & dia. 250mm.-2nos

• Dimmerstat – 2 A capacity.

• Measurements —

• voltmeter and an Ammeter to measure input power.

• Multichannel digital temperature indicator to measure temperatures at- various points.

• technical manual accompanies the unit.

• 230 V, A.C. operating

• Bench area Im x lm x 0.5m height

DESCRIPTION:-

The Stefan Boltzmann constant is an important constant in heat transfer. The apparatus determines Stefan Boltzmann constant. The apparatus consists of a hemisphere surrounded by hot water. Hot water is obtained from a water-heating tank. When the blackened disc is inserted at the center of hemisphere, heat is transferred into the disc from hemisphere by radiation and its temperature begins to rise, and from temperature raise rate. (It is measured at the intervals of 5 sec.) Stefan Boltzmann constant is determined.

Technical Details:-

• Water heating tank provided with electric immersion heater.

• Hemisphere made of copper sheet, 200mm. dia. Surrounded water jacket of 250 mm. Dia.

• Test disc made of copper 20 mm. dia. provided with thermocouple at the center.

• Multichannel digital temperature indicator 0-200 C with 0.1C least counts to measure the temperature of hemisphere and disc.

• A technical manual accompanies the unit.

• 230 V, A.C. operating

• Bench area 750 mm x 500 mm x 500 mm height

DESCRIPTION:-

The apparatus consists of a channel in which the pin fin is tested in both natural as well as forced convection. The channel is connected to the suction of blower. The blower is operated to touch the pin fin in forced convection only. In natural convection, the window above the pin fin is kept open to the atmosphere. Five thermocouple tapings are given along the length of the fin. Thus the temperature distribution along the length can be distinguished. Also natural and forced heat transfer co-efficient, effectiveness, etc. can be found out.

Technical Details:-

• Three pin fins- Mild Steel.,Brass, Aluminium

• Channel- 150mm x 100mm x 1000mm

• Blower – run by f.h.p. motor.

• Orifice meter along with water manometer to measure airflow.

• Voltmeter and ammeter to measure power input.

• Thermocouple with 6 tapings along with temperature indicator.

• Dimmer stat to control power input.

• A band heater to heat the pin fin.

• 230 V, A.C. operating

• Bench area 2000 mm x 1000 mm x 1000 mm height

DESCRIPTION:-

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. Thus students can determine overall heat transfer coefficient and local transfer coefficients in natural convection at various heat transfer rates.

Technical Details:-

• Pipe – Brass pipe, 38mm. dia. (OD) 500mm. long, fitted with cartridge heater inside.

• Thermocouples are fitted along with the length of pipe for Temperature measurement – 7 nos.

• Enclosure 200mm. x 200mm. x 800mm. size, with one side of Perspex sheet.

• Dimmerstat for heater input control.

• Voltmeter and Ammeter for heater input measurement.

• Multichannel digital temperature indicator.

• 230 V, A.C. operating

• Bench area 1500 mm x 700 mm x 700 mm height

DESCRIPTION:-

The apparatus consists of a copper bar, which is heated at one end, a heat sink is provided at other end. The test section of bar is properly insulated and thermocouples are attached along the length of bar. Heat conducted through the section of bar is measured by heat collection in water-cooled heat sink. A panel comprising of controls and measurements is provided, which provides easy operation and sturdy mounting of unit.

Technical Details:-

• Metal Bar – 25mm of adequate length, provided with 8 Thermocouples along the length, Band heater at one end and water-cooled heat sink at other end. Test portion of bar is insulated.

• Voltmeter … 1No.

• Ammeter … 1No.

• Dimmer stat 0-230v, 2A, capacity.

• Multichannel Digital temperature Indicator.

• Measuring flask and stop clock

• 230 V, A.C. operating

• Bench area 1500 mm x 700 mm x 700 mm height

• Water supply at the rate of 2 lit/mm required

DESCRIPTION:-

The unit consists of a circular pipe; loosing heat by forced convection to air, being forced through it. Constant heat flux is added to pipe by an electrical heater, provided with input control. The pipe surface temperature is measured at various points along length of pipe. Temperature of air at inlet and outlet of test section are measured. Thus the students can calculate local and overall heat transfer coefficients in forced convection, at various airflow rates and various heat flux values.

Technical Details:-

• Test pipe – 32mm NB GI pipe, 500 mm. long, heated by band heater, outside.

• Centrifugal blower to force air through test pipe with How control valve.

• Variac 2A, capacity to force air through test pipe with flow control valve.

• An orifice meter with differential water manometer.

• Voltmeter and Ammeter to measure heater input.

• Multichannel digital temperature indicator to measures various temperatures.

• A technical manual accompanies the unit.

• Bench area 0500 mm x 700 mm x 700 mm height

DESCRIPTION:-

The apparatus consists of a test plate and a comparator. A black plate is used as a comparator for test plate. When all the physical, dimensions and the temperatures are equal, heat losses from both plates will also be the same, except radiation losses. Hence the input difference will be due to difference in emissive. Both the plates are kept in a panel enclose with perplex front and are given inputs through separate dimmerstats so that temperatures of both can be kept equal. Thus emissivity can determine over a wide range of temperatures.

Technical Details:-

• Test plate and Black plates — 160mm. Dia. Aluminum plates, mounted in Panel with mica heater inside.

• Voltmeter and ammeter for input measurement to both heaters through a selector switch.

• Separate dimmers for both the plates.

• Multichannel digital temperature indicator.

• A technical manual accompanies the unit.

• Bench area 0500 mm x 700 mm x 700 mm height