quiz-solution5

# quiz-solution5 - 650:351 Thermodynamics Doyle Knight...

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Unformatted text preview: 650:351 Thermodynamics Doyle Knight Department of Mechanical and Aerospace Engineering Rutgers - The State University of New Jersey New Brunswick, NJ USA Tel: 732 445 4464 · Email: [email protected] Office hours: Tuesday and Friday, 9:00 am to 11:30 am and by appointment Quiz No. 5 An air compressor takes air at 100 kPa and 17 ◦ C and delivers it at 1 MPa and 600 K to a constant pressure cooler. The air exits the cooler at 300 K. Find the specific compressor work ( i.e. , work per unit mass) and the specific heat transfer in the cooler. Solution The First Law of Thermodynamics is dE cv dt = ˙ Q cv − ˙ W cv + summationdisplay ˙ m i parenleftBig h i + 1 2 V 2 i + gZ i parenrightBig − summationdisplay ˙ m e parenleftBig h e + 1 2 V 2 e + gZ e parenrightBig We first select a control surface surrounding the compressor. The flow is steady, and there is a single inflow and single outflow. The kinetic energy and potential energy per unit mass do not change significantly (see Lecture Notes) since it is a compressor....
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quiz-solution5 - 650:351 Thermodynamics Doyle Knight...

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