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In this work, the design and development of an ice block making machine is reported.The average temperature of many tropical parts of Africa like Nigeria is around 35oC which increases the demand for ice block, thus, the need for an ice block making machine.The machine is of external dimensions of 900mm × 600mm × 500mm.It is 20mm thick made up of 1mm of galvanized steel plate (outside), 15mm of polystyrene (an insulating material) and 1mm of aluminum (inside).The cooling load calculation gives a refrigeration capacity of 4.014kW, compressing/condensing unit of 1hp and with 4 evaporator plates each rated hp.The calculated coefficient of performance (C.O.PR) was 5.65 and the refrigerating efficiency 84.0%.Under test running with 3.85kg of water placed inside the box at an initial temperature of 280 C, there was a gradual reduction in temperature at interval of 30minutes.After a period of 5hrs-30mins, the temperature of the water dropped to 00C.A graph of temperature T (Celsius) against time (min.)indicated that the temperature varied inversely as the time.The implication of this inverse relationship is that the temperature drops with increase in time.From the graph, it was determined that for the water to completely turn to ice block at -40C, it would require a time period of 6hrs, 30mins The outcome of this test shows that the constructed Ice Block Making Machine has been able to produce a cooling effect capable of turning water from room temperature into Ice block.
Halleluyah et al. (Tue,) studied this question.