Dinesh Scientific.

The cross flow heat exchanger is air-to-air type heat exchanger. On both hot and cold

sides, air flow is generated by centrifugal blowers. Hot air is obtained by passing air over a bank of finned

tubes. The air then flows to heat exchanger section i. e. a bank of finned tubes. Hot air flows through tubes

while cold air flows over the tubes at right angle to hot air. The experiments can be conducted over various

air flow rates and air temperatures to determine LMTD, heat transfer rates and effectiveness of heat

exchanger.

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To determine the water side overall heat transfer coefficient on a

cross-flow heat exchanger

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Electricity Supply: 1Phase, 220 V AC, 3 kW

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Floor area 3 m x 2m

Finned tubes. 17mm. I. D., 20mm. O. D., 0.5mtr. long tube with

The present Setup is designed to measure the emissivity of test plate. The test plate

comprises of a mica heater sandwiched between two circular plates. Black plate is identical with test plate,

but its surface is blackened. As all the physical properties, dimension and temperature are equal; heat losses

from both plates will be same except radiation loss. Hence the input difference will be due to difference in

emissivity. Both plates are supported on individual brackets in a wooden enclosure with one side glass to

ensure steady atmospheric conditions. Temperature Sensors are provided to measure the temperature of

each plate and surrounding. Supply is given to heaters through

separate Variac so that temperatures of both can be kept equal

and is measured with Digital Voltmeter and Digital Ammeter.

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Determining the Emissivity of a test plate.

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Study the variation of emissivity of test plate with respect to

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Electricity Supply: 1Phase, 220 V AC, 4 Amps.

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Table for setup support

160mm

It is a superconducting device and involves the transfer of heat by boiling and condensation of a fluid and hence transfer of heat takes place under nearly isothermal condition. In this apparatus the comparison of heat pipe with the copper pipe as good conductor of heat and with the stainless steel pipe as same material of construction is made. It 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. The performance of the heat pipe as a superconducting device can be studied well in terms of the temperature distribution along the length at a given instant and can be compared with other two members. Nearly isothermal temperature distribution and fast rise of temperature in heat sink tank reveals the heat pipe superiority over the conventional conductors.

To demonstrate the super thermal conductivity of Heat Pipe and to compare its working with best

To plot the temperature v/s time response of three pipes

To plot the temperature distribution along the length of three pipes

Electricity Supply: 1Phase, 220 V AC, 4 Amp

Table for setup support

1st

Heat pipe made of stainless steel

nd

Made of coppe

Made of Stainless steel.

Material Stainless steel

The setup is designed to study the heat transfer in a pin fin. It consists of pin type fin fitted

in duct. A fan is provided on one side of duct to conduct experiments under forced draft

conditions. Airflow rates can be varied with the help of damper provided in the duct. A heater

heats one end of fin and heat flows to another end. Heat input to the heater is given through Variac. Digital

Temperature Indicator measures temperature distribution along the fin.

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To study temperature distribution along the length of fin in both Free & forced convection

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Comparison of theoretical temperature distribution with experimentally obtained distribution

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Electricity Supply: 1 Phase, 220 V AC, 5 Amps.

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Table for setup support

Brass Size : 12.5 mm (approx.) 15 cm long (approx.)

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.

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To determine average surface heat transfer coefficient for a pipe losing heat by forced convection.

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Comparison of heat transfer coefficient for different airflow rates and heat flow rates.

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To plot surface temperature distribution along the length of pipe

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Electricity Supply: 1 Phase, 220 V AC, 10Amp.

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Floor area of 1.2mx 0.5m

Dia : 28 mm (approx.)

The setup consists of a brass tube fitted in a rectangular duct in a vertical fashion.The duct is

open at the top and bottom, and forms an enclosure and serves the purpose of undisturbed

surrounding. One side of the duct is fitted with a transparent

good quality Acrylic window for visualization. An electric

heating element is kept in the vertical tube that in turns

heats the tube surface. The heat is lost from the tube to the

surrounding air by natural convection. The temperature of

the vertical tube is measure by Temperature Sensors and

displayed by a Digital Temperature Indicator with multichannel

switch. The heat input to the heater is measured by

a Digital Ammeter and a Digital Voltmeter and is varied by a

Variac. The tube surface is polished to minimize the radiation

losses.

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To determine average heat transfer coefficient

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Electricity Supply: I Phase, 220 V AC, 2 Amps.

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Table for setup support

Dia: 38 mm (approx).

It provides visualization of two phases of liquid viz. boiling and condensation. The liquid is

R-11 in which a hot cylinder is immersed. The boiling of liquid can be observed over heater

surface up to nucleate boiling phase. Condenser coil is provided at the top of the cylinder, over which the

vapor is condensed to liquid. A pressure of the vapor and water flow in condenser is measured by a pressure

gauge & Rotameter. Dimmer stat provides control of heater surface temperature and thermometer notes

liquid temperature, inside glass cylinder.

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To study the

two phases heat transfer

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Electricity Supply: 1Phase, 220 V AC, 3

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Floor area 2 m x 1m

0-230v, 2 Amps. Capacity for heater control.

Heat exchanger is devices in which heat is transferred from one fluid to another. The apparatus

consists of a concentric tube heat exchanger. Hot water flows through inner tube in one direction only and

cold water flows over the inner tube in outer tube. Direction of cold fluid flow can be changed from parallel

or counter to hot water so that unit can be operated as parallel or counter flow heat exchanger. Flow rates

of hot and cold water are measured using Rotameter. 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.

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To calculate the following parameters both for parallel and counter flow

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To find the rate of heat transfer

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To calculate the LMTD

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Overall heat transfer co-efficient.

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To compare the performance of Parallel and Counter flow heat exchanger

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Water supply 10 lit/min (approx.) and drain

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Electricity Supply: 1Phase, 220 V AC, 3 kW

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Floor area 2 m x 0.6m

Water to Water

The apparatus is designed to determine, the Stefan Boltzmann constant.

The apparatus

consists of a hemisphere fixed to a Bakelite plate, the outer surface of

which forms the jacket to heat it. Hot water to heat the hemisphere is

obtained from a hot water tank, which is fixed above the hemisphere. The

copper test disc is introduced at the center of hemisphere. The

temperatures of hemisphere and test disc are measured with the help of

temperature sensors.

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Determination of Stefan Boltzmann constant and study the effect of

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Electricity Supply: I Phase. 220 V AC, 2 kW.

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Table for setup support

Dia.200 mm (approx.) made of Copper

Insulating Powder Apparatus is designed to determine the thermal conductivity of insulating

powder. The Apparatus consists of two thin walled concentric copper spheres. Inner

sphere houses Nichrome Wire heating coil. Insulating powder is filled between the spheres. Heat flows

radially outwards. Temperature sensors at proper positions are fitted to measure surface temperatures of

spheres. Heat input to the heater is given through a Variac and measured by Digital Voltmeter & Digital

Ammeter. By varying the heat input rates, wide range of experiments can be performed.

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Determination of thermal conductivity of insulating

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Comparison of thermal Conductivity of insulating

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Electricity Supply: 1 Phase, 220 V AC, 2 Amps.

Dia. 100mm

The present apparatus is designed to determine thermal conductivities of different liquids.

The apparatus consists of a heater. The heater heats a thin layer of liquid. A cooling plate

removes heat through liquid layer, ensuring unidirectional heat flow. Temperature is measured across the

liquid layer and complete assembly is properly insulated. A proper arrangement for changing the liquids is

provided. The whole assembly is kept in chamber.

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Determination of Thermal conductivity of

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Study of variation of thermal conductivity

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Water supply 5 lit/min (approx.)

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Drain. .

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Electricity Supply: 1Phase, 220 V AC, 2

170 mm (approx) Height : 22 mm (approx)

The experimental set up consists of metal bar, one end of which is heated by an electric heater while the other end of the bar projects inside the cooling water jacket. A cylindrical shell filled with the asbestos insulating powder surrounds the middle portion of the bar. The temperature of the bar is measured at different sections. Heat Input to the heater is given through Variac and measured by Digital Voltmeter & Digital Ammeter. By varying the heat input rates, wide range of experiments can be performed. Water under constant head condition is circulated through the jacket and its flow rate and temperature rise is noted.

To plot the temperature distribution

To determine the thermal conductivity

Water supply 3 lit/min (approx.)

Drain

Electricity Supply: 1 Phase, 220 V AC 2

Copper Length : 450 mm Dia : 25mm