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a) You are probably familiar with the frozen Pizza Pockets snacks by McCain that you can buy in any grocery store. In this problem,
a) You are probably familiar with the frozen Pizza Pockets snacks by McCain that you can buy in any grocery store. In this problem, you have to evaluate the energy required to heat a Pizza Pocket from its initial frozen temperature of -20C to a final temperature of 95C. (50 marks) The following information is to be used: 1 POCKETS POCHETTES Fro Ingredient Crust Tomato sauce Cheese Water content (% mass) 30% 70% McCain PIZZA POCKETS POCHETTES Three Cheese Trois Fromages 60% Mass 25 grams 60 grams 15 grams Freezing point 0C 0C 0C You can use Siebel's formula: Melting point Cpfresh = 3.35-a +0.84 [kJ/kg C] Cpfrozen = 1.26-a +0.84 [kJ/kg C] Ahlatent 334-a [kJ/kg] 65C For full marks, use the methodology shown in class, write all assumptions. For the cheese, you may assume that (1) the specific heat is the same whether it is fresh or melted, and (2) the melting process can be approximated as a phase change. b) The cooking instructions on the packaging recommend cooking a Pizza Pocket in the microwave on high setting for 60-90 seconds. If your microwave oven has a power output of 800Watts, how long will it take to heat the Pizza Pocket? Are the cooking instructions adequate? (10 marks)
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