Design of control system and fabrication of special compartment in Static Refrigerators

Abstract

Refrigerators being used for domestic purposes are of three types, namely static, brewed, and no-frost. The aim of this project was to introduce a new compartment in static refrigerators to enhance the quality and freshness of food present in this compartment. It was achieved by having control over temperature depending on the needs of the user and needs for the type of food inside the compartment. There can be two methods to fabricate this special compartment. One is by using parallel evaporators and other is by using fan and airduct. The parallel evaporator method is expensive but highly efficient, while air duct is less expensive and does not compromise enough efficiency, in term of energy consumption and cooling. The airduct was implanted in the refrigerator and results were taken. The result shows the total time to reach the target temperature, and time to drop per half degree of temperature. The target was to set the temperature at any value between 5 to -5 oC. In this project, the minimum temperature achieved was -1 oC, as the average temperature of evaporator goes to -12 oC, rather than the -18 oC for most of the domestic refrigerators.