Problem Statement: Design a cooler for use outdoors for camping or fishing in th

Question

Problem Statement: Design a cooler for use outdoors for camping or fishing in the summer in Georgia. Let's say that the internal volume of the cooler should be 0.1m3. This cooler, in order to keep your lunch or freshly caught fish cold, should be able to keep the contents a maximum of 5 °C when the outdoor temperature is 35 °C. For this problem assume the cooler is in the shade, so do not include radiation calculations 1. Decide what material the outside of the cooler will be made of and what shape you would like it to be. It is up to you whether you want this to be Wal-Mart quality or Yeti quality Investigate at least two different materials to use for insulation. Research their thermal properties and include them in your write-up. Try to locate some pricing for the materials as well, if possible 2. 3. Although you could probably run a computer model for this cooler, just assume that you can figure out the dimensions using the techniques we have studied in Chapter 3. Include internal and external convection coefficients that seems reasonable from looking at the information in the textbook (example problems, etc.) and list your assumptions on your paper. Again, there are no exact answers. Remember that the cooler has SIX sides for heat gains! Include a sketch of your cooler and final dimensions, along with calculations that show that you have met your design criteria! 4.

Explanation / Answer

1. To withstand the elements, an outdoor refrigerator must be rust-resistant. For that reason, almost all are constructed of stainless steel. But all stainless is not created equal. Buyers are urged to seek out grade 304 stainless, also called 18/8, because of the alloy’s higher resistance to corrosion. Less-expensive fridges will be made from plastic-wrapped steel or grade 430 stainless, a ferrous metal that is susceptible to rust.

2. insulation material table with their property:-

Density values and thermal conductivity at 20-25 °C of polyurethane insulation

Material Type Density Thermal Conductivity (W/M C) Foam 30 0.026 Rigid expanded board 30 0.02-0.025 Rigid expanded board 40 0.023 Rigid expanded board 80 0.04

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