You Are Planning To Bake A Loaf Of Bread In An Oven Set To A Temperature Of 225 C The Unbaked Bread Is Initially At 20 1 (57.16 KiB) Viewed 21 times
You are planning to bake a loaf of bread in an oven set to a temperature of 225°C. The unbaked bread is initially at 20°C. The loaf is considered to be baked once its temperature reaches 80°C. The heat transfer (i.e. convection) coefficient between the bread and the inside of the oven is 1 W/m²K. You may assume that the loaf of bread can be treated as a rectangular solid (40 cm long and 10 cm on the other two sides) and that radiation effects can be neglected. Assume the following constant properties- Bread: p=240 kg/m”, k=0.4 W/m K, Cp=1.5 kJ/kg K; Air: p=1.2 kg/m3, k=0.03 W/mK, Cp=1 kJ/kg K. Question 15 5 pts Quantitatively determine if a lumped system analysis can be used to analyze the heat transfer between the loaf of bread and the oven. Justify your answer in your submitted work (or here). Edit View Insert Format Tools Table 12pt Paragraph Β Ι Ο A < T2 v
> Question 16 10 pts Assuming that you can use a lumped system analysis, determine the total amount of energy gained by the bread during baking from 20°C to 80°C (in kJ). > Question 17 10 pts Assuming that you can use a lumped system analysis, determine how long it will take to bake the bread (in minutes).
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