A portable refrigeration machine requiring no external
Chapter 11, Problem 11.4D(choose chapter or problem)
A portable refrigeration machine requiring no external power supply and using carbon dioxide at its triple point is described in U.S. Patent No. 4,096,707. Estimate the cost of the initial carbon dioxide charge required by such a machine to maintain a 6 ft by 8 ft by 15 ft cargo container at \(35^{\circ} \mathrm{F}\) for up to 24 hours, if the container is fabricated from sheet metal covered with a 1-in. layer of polystyrene. Would you recommend the use of such a refrigeration machine? Report your findings in a PowerPoint presentation.
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