Bolaji, B.O. & Falade, T.O. recognizethe need of an experimental apparatus for institutions of higher educations toimprove learning experience of students by providing practical demonstrations. Withthis apparatus, principles learn in classroom lectures can be simulated orapplied to real-life problems such as the demonstration of a vapour compressioncycle in a refrigeration system which is basically what the researchers did.
Inthe design process, the first step involves the formulation of the problemstatement followed by evaluating conceptual designs. The effectiveness of thedesign as an instructional laboratory apparatus was considered in the criteriaalong with the cost, safety, simplicity and size. The components selected werehermetically sealed compressor, simple capillary tube as expansion device, finned-tubecondenser, and the evaporator with bare plate & inner coil tube forrefrigerant. Dryer-filter and receiver were also added between the condenserand capillary tube, and a flow meter for the mass flow rate measurement.
Theworking fluid used is R134a with temperature and pressure measured at fourdifferent points indicated in Figure <__>.Figure <___>: Schematic diagram of the experimentalapparatus for demonstrating vapour compression refrigeration systemUpon construction, tests were done which shows the sampleresults that the apparatus is successfully designed and built for the intentionof demonstrating the said principles. The tests include the computation of thesystem’s heat gain & loss, and the performance parameters of the systemsuch as the coefficient of performance (COP) of the refrigeration cycle andCarnot cycle, isentropic efficiency, and relative efficiency.