Description
The bench-mounting equipment includes a vertical duct that holds the chosen heat transfer surface and all instruments needed. We includes three diff erent common heat transfer surfaces with the equipment: • A fl at plate • A pinned surface – similar to a tubular heat exchanger • A fi nned surface – similar to the fi ns on air-cooled engines or electrical heat sinks Each surface has its own built-in variable-power electric heater. Students choose which surface they need to test and fi t it to the duct using simple fi xings. For free convection tests, the heated air rises from the surface and up the duct. For forced convection tests, a variable-speed fan draws air up through the duct and across the surface. Thermocouples measure the air temperature upstream and downstream of the surface and the temperature at the heat transfer surface. The downstream probe moves in a traverse mechanism to measure the temperature distribution across the duct, allowing calculation of the bulk outlet temperature. An additional probe allows students to measure the temperature distribution along the extended surfaces of the pinned and fi nned heater transfer surfaces. A sensitive anemometer measures the air velocity.
Learning outcomes
Comparing free and forced convection for different surfaces
Comparison of free convection from vertical and horizontal (finned) surfaces
Comparison of heat transfer surface efficiency
Comparing the coefficient of heat transfer and Nusselt Number for forced and free convection
Temperature distribution along finned and pinned surfaces
Features:
Includes three of the most common heat transfer surfaces: flat plate, pinned and finned
Thermocouples and a sensitive anemometer measure temperatures and air velocity – shown on a digital display
Additional hand-held thermocouple probe included – to measure temperatures along the length of the pins and fi ns of two heat transfer surfaces
Variable-speed fan and variable power heat source for a range of tests
Can connect to Versatile Data Acquisition System
Specifications
ATICO is committed to a programme of continuous improvement; hence we reserve the right to alter the design and product specifi cation without prior notice.
Nett dimension and weight (when assembled with anemometer on duct):
850 mm wide x 550 mm front to back x 1200 mm high and
approximately 30 kg (including the three heat transfer surfaces)
Approximate packed volume and weight: 0.6 m3 and 40 kg
Operating Conditions
Operating environment:
Laboratory
Storage temprature range :
–25°C to +55°C (when packed for transport)
Operating temprature range :
+5°C to +40°C
Operating relative humidity range :
80% at temperatures < 31°C decreasing linearly to 50% at 40°C
