Introduction: This unit consists of a bench mounted vertical air duct positioned on the top of a centrifugal fan. The air duct incorporates an aperture positioned at the rear wall of the duct, into which three different types of heat transfer surfaces can be inserted. The three types of heat exchangers supplied are; flat plate, cylindrical pins and finned surface. Incorporating an electrical heating element, with positive thermal cut-out, and thermocouples for precise temperature measurement.

Specifications: A bench mounted unit specifically designed to demonstrate the phenomena of free and forced convection and to measure temperature profiles from three different heat transfer surfaces.Comprises a vertical air duct, with a transparent front for visibility mounted on a fan at the base of the duct, three heat transfer surfaces, air flow, and temperature probes.Technical data is included for each of the three heat transfer surfaces, which will enable students and researchers to compare practical results with theoretical analysis for free and forced convection.Three heat transfer surfaces supplied: a flat plate surface area 0.011m2, pinned extended surface area 0.0525m2, and finned extended surface area 0.1414m2.Vertical duct incorporates a transparent front wall allowing complete visualization of the process and identification of the air flow and temperature sensors.Each heat transfer surface is fitted with its own heater (240W) and thermocouples, to enable easy interchange.