FE 356 Appl. Math. In Food Engineering

An electrical coil is used to heat 80 L of oil in a closed vessel. The oil is initially at 25C. The coil delivers a power as a function of time; 0.0520tQe power in kW. At time zero, 2L/min of oil at 15c enters the vesselwhile the same amount discharges from it. At the same time 30 kj/min of heat is lost from the system. Given; 800 3 kg/m, Cp=2.5 kj/kgC. Determine;

a) the temperature of oil as a function of time,

b) the time required fort he temperature of oil t oto 80C

c) the maximum temperature.

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