Free and Forced Convection Heat Transfer Unit Model TH 015
Free and Forced Convection Heat Transfer Unit Model TH 015
Heat Transfer is an important subject in Engineering and Technology. Proper understanding of the heat transfer phenomena is essential to solve any research, design and development problem involving heat flow.
Heat is transmitted through conduction, convection and radiation.
Convection is an important mode of heat transfer in liquids and gases.
Item Description
Sci-tech Free and Forced Convection Heat Transfer Unit Model TH 015 is a bench top unit with observation
windows and is designed to enable students to study both free and forced convection heat transfer processes from the flat plate, circular cylinder in a tube bundle and the tapered fin. The design is modular in construction and there is a provision to change the heat transfer surface easily in the unit. The unit consists of a vertical square duct in which air flow is obtained by means of a variable speed axial flow fan to carryout forced convection experiments.
Honeycomb and screens are provided at the inlet of the duct to straighten the air flow. The flat plate, cylinder and tapered fin models are electrically heated using a variable heater and the temperature of the heat transfer surface can be limited using thermostats. The fan can be switched-on for forced convection experiments and switched-off for free convection experiments. There is a provision for the measurement of temperature of the heat transfer surface and the surrounding air inside the duct using temperature sensors. Air velocity inside the duct is measured using sensor. The control panel houses heater and fan speed controls, digital displays of fan speed, surface and surrounding temperatures, air flow velocity, switches and fuses.
Technical Specifications
1. Air duct, vertically placed, 1.2 m long, 120 mm square cross section with honey comb and screen at inlet,
max. air flow velocity: 15 m/s.
2. Variable speed axial flow fan with speed controller.
3. Flat plate with heater, copper, 100 mm X 150 mm.
4. Circular cylinder with heater, copper, in tube bundle, total surface area of tubes: 0.1 m2.
5. Tapered fin with heater, copper, surface area: 0.16m2.
6. Heater elements, (3 Nos.). 200 W, max. temp. 1250C with temperature controller.
7. K-type thermocouples, (3 Nos.) 0-1500C.
8. Air flow velocity sensor, 0 – 20 m/s.
9. Hand held temperature sensor.
10. Control panel with digital display of measured parameters.
Services required: Single phase mains electrical supply: 220-240 V, 50 Hz.
Overall dimensions: Length: 800mm, Width: 400mm, Height: 1500mm.
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