3. A commercial cubical refrigerator, 3 m on a side, has a composite wall consisting of an exterior sheet of 6.35-mm-thick plain carbon steel, an intermediate layer of 125-mm-thick cork insulation, and an inner sheet of 6.35-mm thick aluminum alloy (2024). Adhesive interfaces between the insulation and the metallic sheets are characterized by a thermal contact resistance of R=2.5 x 104 m²-K/W. What is the steady-state cooling load that must be maintained by the refrigerator when the outer and inner surfaces of all six sides are 25°C and -5°C, respectively?

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Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.