NUST Institutions Library Catalogue

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.