SANNI AMETU OLUWATOBI

This project presents the design and fabrication of a system capable of reheating food and maintaining its temperature. Heat was generated by converting the electrical energy derived from both the Alternating Current (A.C) and Direct Current (D.C) source. The A.C circuit consisted of a heating element of 220V, 1kW power rating, and an electrical outlet a thermocouple and a temperature controller; the D.C circuit consisted of a mobile filament of 6V, 55W power rating, a dry cell D.C lead battery of 12V and 18Ah a thermocouple and temperature controller. A cup of water, meat pie, and a bowl of cooked rice was used to test the system’s performance and the set temperature was 60 degrees (ºC). At the end of the A.C experiment, it took the system approximately 7 minutes to reach the set temperature in the case of water, 7 minutes for the meat pie, and 6 minutes for the cooked rice. Due to heat transfer conditions, the food overheated; the water reached a maximum temperature of 83 degrees and the meat pie reached a maximum temperature of 81 degrees (ºC). The time taken for the food to reach the set temperature value after heating was approximately 45 minutes. At the end of the D.C experiment, it took the system approximately 22 minutes to reach the set temperature in the case of water, 20 minutes for the meat pie, and 21 minutes for the cooked rice. Due to heat transfer conditions, the temperature of the food increased further; the water reached a maximum temperature of 70 degrees, the meat pie reached a maximum temperature of 66 degrees (ºC), and the cooked rice reached a temperature of 68 degrees. The time taken for the food to reach the set temperature value after heating was approximately 23 minutes.