Engineers R Us is preparing for the Spring Fish Fry. To start off preparations,
ID: 1628552 • Letter: E
Question
Engineers R Us is preparing for the Spring Fish Fry. To start off preparations, they are going to heat 2 gallons of cooking oil from room temperature (70 degree F) to 350 degree F. You may assume that the specific heat of the cooking oil is 2.25 J/(g degree C) and the specific gravity is 1.72. You will need this information for Questions 12 and 13. 12. How much energy is required for the task, in units of Btu? 13. Knowing how much energy is required from Question 12, if the burner selected burns 1350 W of fuel and is 30% efficient, how long, in units of hours [hr], will it take the burner to heat the oil?Explanation / Answer
12
energy=mass*specific heat capacity*change in temp
mass=density*volume=1.72*1000*0.00757082=13.02 kg
specific heat=2250 J/kg C
change in temp=155.5559 C
energy=4557010.09 J=4319.212 Btu
13
efficient energy=0.3*1350*time=4557010.09
time=11251.87 sec=3.12 hours
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