PROPRIETARY MATERIAL. McGraw-Hill 5판 열역학 2장

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PROPRIETARY MATERIAL. McGraw-Hill 5판 열역학 2장에 대한 보고서 자료입니다.

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2-8 A river is flowing at a specified velocity, flow rate, and elevation. The total mechanical energy of the river water per unit mass, and the power generation potential of the entire river are to be determined.
Assumptions 1 The elevation given is the elevation of the free surface of the river. 2 The velocity given is the average velocity. 3 The mechanical energy of water at the turbine exit is negligible.
Properties We take the density of water to be ρ = 1000 kg/m3.
Analysis Noting that the sum of the flow energy and the potential energy is constant for a given fluid body, we can take the elevation of the entire river water to be the elevation of the free surface, and ignore the flow energy. Then the total mechanical energy of the river water per unit mass becomes
kJ/kg 887.0/sm 1000kJ/kg 12)m/s 3(m) 90)(m/s (9.81222222mech=

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열역학,   솔루션,   5판,   hill,   2장