Explanation Write the energy rate balance equation. 0 = Q ˙ cv − W ˙ cv + m ˙ [ ( h 1 − h 2 ) + ( V 1 2 − V 2 2 ) 2 + g ( z 1 − z 2 ) ] (I) Here, the rate of heat transfer is Q ˙ cv , rate of work transfer is W ˙ cv , rate of mass flow is m ˙ , the enthalpy is h , velocity is V , gravitational acceleration is g , the elevation is z and the suffixes cv, 1 and 2 indicates control volume, initial and final state of the system respectively. Here, hot combustion gases modeled as air behaving as an idea gas. Hence, the kinetic and potential energies are neglected, i.e. ( V 1 2 − V 2 2 ) 2 = 0 and g ( z 1 − z 2 ) = 0 . Then the Equation (I) becomes as follows. W ˙ cv = Q ˙ cv + m ˙ ( h 1 − h 2 ) (II) Refer Table A-22E, “Ideal gas properties of air”. The inlet enthalpy ( h 1 ) corresponding to the temperature of 2700 ° R is 703

Fundamentals of Engineering Thermodynamics

8th Edition

ISBN: 9781118832318

Author: MORAN

Publisher: WILEY

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The word 'thermodynamics' can be divided into two words, 'thermo' and 'dynamics'. The word thermo deals with the heat and thermal phenomenon, whereas dynamics deals with forces or external agent that drives the heat flow or aids in the motion of heat.

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