Eggs with a mass of 0.12 kg per egg and a specific heat of 3.32 kJ/kg.°C are cooled from 30°C to 10°C at a rate of 800 eggs per minute. The rate of heat removal from the eggs is
A)8.0 kW
B)53 kW
C)478 kW
D)106 kW
E)159 kW

Question

Quizplus · Accepted Answer

Solved by EES Software. Solutions can be verified by copying-and-pasting the following lines on a blank EES screen. 
C=3.32 "kJ/kg.K"
m_egg=0.12 "kg"
T1=30 "C"
T2=10 "C"
n=800 "eggs/min"
m=n*m_egg/60 "kg/s"
"Applying energy balance E_in-E_out=dE_system gives"
"-E_out = dU_system"
Qout=m*C*(T1-T2) "kJ/s"
"Some Wrong Solutions with Common Mistakes:"
W1_Qout = m*C*T1 "Using T1 only" 
W2_Qout = m_egg*C*(T1-T2) "Using one egg only" 
W3_Qout = m*C*T2 "Using T2 only" 
W4_Qout=m_egg*C*(T1-T2)*60 "Finding kJ/min"

Eggs with a Mass of 0