Explanation Write the energy balance equation for the closed system for which the exhaust pipe is taken as system. E ˙ in − E ˙ out = Δ E ˙ system (I) Here, rate of net energy transfer in to the control volume is E ˙ in , rate of net energy transfer exit from the control volume is E ˙ out and rate of change in internal, kinetic, potential energies of system is Δ E ˙ system . For steady state, the rate of change in internal, kinetic, potential energies of system is zero. Δ E ˙ system = 0 Substitute 0 for Δ E ˙ system in Equation (I). E ˙ in − E ˙ out = 0 E ˙ in = E ˙ out m ˙ h 1 = Q ˙ out + m ˙ h 2 Q ˙ out = m ˙ gas ( h 1 − h 2 ) Q ˙ out = m ˙ gas c p ( T 1 − T 2 ) (II) Here, mass flow rate of exhaust gas is m ˙ ( m ˙ gas ) , rate of heat transfer from the exhaust gas is Q ˙ out , constant pressure specific heat of exhaust gas is c p , specific enthalpy of exhaust gas at the inlet is h 1 , specific enthalpy of exhaust gas at the exit is h 2 , temperature of exhaust gas at the inlet is T 1 and temperature of exhaust gas at the exit is T 2

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ISBN: 9781307434316

Author: CENGEL

Publisher: INTER MCG

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Chapter 8.8, Problem 81P

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The rate of heat transfer to the air.

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Chapter 8.8, Problem 80P

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The rate of heat transfer to the air.

Solution Summary: The author explains the energy balance equation for the closed system for which the exhaust pipe is taken as system.

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