Prepare the thermal design for a refrigerated container truck to carry frozen meat from Butte, Montana, to Phoenix, Arizona. The refrigerated shipping container has dimensions of 6 m × 3 m × 2.5 m and uses dry ice as the refrigerant. For this design it is necessary to select suitable insulation type and thickness. Also estimate the size of the dry ice compartment sufficient to maintain the temperature inside the container at 0°C when the average outside surface temperature of the container during the trip may rise up to 38°C. Dry ice currently costs $0.6/kg and the shipping company would like to know the amount of dry ice required for one trip and its cost. Assuming that the insulation on the truck lasts for 10 years, prepare a cost comparison of insulation thickness for the container vs. the amount of dry ice necessary to maintain the refrigeration temperature during the trip. Clearly state all of your assumptions.

Transcribed Image Text:

Compacted MgO insulation 3 cm 2 cm 3 cm (www) cm.……………….. Nichrome wire 2 cm Nichrome wire Metal sheath (a) Metal sheath Compacted MgO insulation. (b) XXXXX Flowing water (c) Insulated pipe