The interest to make more efficient use of solar energy in the heating of liquids hasadvanced the solar cookers development. The solar cooker type box with multi-step innerreflector is a strong representative of these developments. The double glass cover, part ofthese cookers, reduce the heat loss convection to the outside and generate the greenhouseeffect within the cooker.The inside of the cooker is lined with an arrangement of inclined mirrors (innerreflectors). These are placed in angles that allow reflecting the solar rays toward onecooking recipient. The temperatures reached by these cookers can be near to 90 Oc,enough temperature for the heating of foods. However, the costs of construction of thiscooker type can be high and such a situation can be an important inconvenience if it isconsidered that these devices should be directed to sectors of the society with lowincome.In this work a second law analysis applied to a solar cooker type box with multi-stepinner reflectors is presented. By the second law efficiency concept, the real yield of thiscooker type is shown. The result of the analysis shows that the yield of the solar cookerunder transitory operation conditions is smaller than 5% and this result added to theconstruction costs, allows a real evaluation of it. The obtained results could be used toestablish the operation conditions and a better use. Further, the results could be used toimprove the design and performance solar cooker type. The analysis is made by numericsimulation, using a non commercial software called ESCRIM.
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