b) (2 pts) What is the rate of heat transfer due to convection? c) (2 pts) What
ID: 1655882 • Letter: B
Question
b) (2 pts) What is the rate of heat transfer due to convection?
c) (2 pts) What is the rate of heat transfer due to radiation?
d) (4 pts) During a process which takes a thermodynamic system from state 1 to state 2, there is one heat transfer into the system, Q1, one heat transfer out of the system, Q2, and one work transfer from the system, W1. Write the conservation of energy equation for the system undergoing this process.
a) (2 pts) What is the rate of heat transfer due to conduction? b) (2 pts) What is the rate of heat transfer due to convection? c) (2 pts) What is the rate of heat transfer due to radiation? d) (4 pts) During a process which takes a thermodynamic system from state 1 to state 2, there is one heat transfer into the system, Q1. one heat transfer out of the system, Q2, and one work transfer from the system, Wi. Write the conservation of energy equation for the system undergoing this process.Explanation / Answer
a) heat transfer due to conduction
in conduction the heat flow is within and through the body.
Q/t = kA(T2 - T1)/d
where k = thermal conductivity A = area d = thicness of the material.
b) heat transfer due to convection.
convecton is the form of heat transfer in liquids and gases.
Q/t = hA(Ta - Tb )
h = heat transfer coeff.
c) heat transfer due to radiaton
this is due to emmison of electromagnetic waves.
Q/t = sigma*T^4*A
where sigma = stefan boltzman constant
T = temperature of body
d) conservation of energy equation for the system
Q1 = Q2 + W1
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