Question

. You're going camping with friends for the weekend, and it is your task to bring a case (24 cans) of beer (or soda, if you prefer). For the task you bought the cooler shown at left. You and your friends like your beer (or soda) ice-cold. You bought it warm, so you will chill it in the cooler, and you need it to stay cold for 48 hours. How many 5 lb bags of ice should you buy? . This task is about translating a real world problem into a problem that you THE HERCULES can solve with your knowledge Heat Transfer. You will need to make several assumptions. Your assumptions should be conservative, but not too conservative. . Your friends don't trust you. They do not want to drink warm beer (or soda) Lifoam's 5345 Hercules heavy duty ice chest offers thick 1.5 inch walls to give you years of quality service. The thick insulation will keep things cool for an extra long time. With molded in side handles and a hinged lid, it is easier to use this great product. The 45 quart capacity will hold up to 48 of your favorite 12 ounce beverages. come Sunday, so they want to review your calculations before the trip. They have studied Heat Transfer, so you do not need to educate them, but you do need to show how you came to your answer. You must declare your assumptions and explain why they are conservative. You must reference your source for any material properties, and you must present your calculations clearly and in sufficient detail for them to review their accuracy Item Weight Product Dimensions Item model number 1.8 pounds 25.2 x 16 x 12.6 inches 5345

Answer 1

Given data no.of beverages n_1 = 48 mass of cone beverage m = 12 ounce = 0.7 slb Initial temp of cold water T_1 = 70 degree F Final temperature of cold water,T_2 = 44 degree F Now our assumption are. The ambient temp is 86 degree F The heat release from the beam Q = 3000 Btu/day the specific heat of beverage is C = 0.82 Btu/lb degree F Apply the heat balance of the system theta required to freez the cala + heat pass from the cal forum b theta n = heat release from the fusion of ic n_1 mc(T_2 - T_1) + Q = n times mice XL} Substitute the values in the above equation 48 times 0.75 times 0.02 (70 - 44) + 3000 times 2 = n times s times 144 Therefore n = 9.39 n TildeEqual 10 Therefore The number of ice bags of 5 lbm required to load the drinks for 48 hrs in 10