To determine The heat transfer of flowing air, in Btu/lb . 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, the air operates in steady state. It is given that, neglect the potential energy effects i.e. g ( z 1 − z 2 ) = 0 , the work done by the nozzle is zero i.e. W ˙ cv = 0 . Then the Equation (I) becomes as follows. Q ˙ cv + m ˙ [ ( h 1 − h 2 ) + ( V 1 2 − V 2 2 ) 2 ] = 0 Q ˙ cv = m ˙ [ ( h 2 − h 1 ) + ( V 2 2 − V 1 2 ) 2 ] Q ˙ cv m ˙ = ( h 2 − h 1 ) + ( V 2 2 − V 1 2 ) 2 (II) When, the inlet velocity is negligible i.e. V 1 = 0 . Substitute 0 for V 1 in the Equation (II)

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Chapter 4.12, Problem 33P

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The heat transfer of flowing air, in Btu/lb.

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Chapter 4.12, Problem 32P

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