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Homework Solution - transfer need not be zero. As an...

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San Francisco State University ENGR 303: Engineering Thermodynamics School of Engineering Prof. Ed Cheng, Spring 2011 Homework 1 solutions NOTE : Solutions for HW problems that are based upon textbook problems reflect numerical values from the text. Numerical values may differ for these problems when they appear on iLearn. In such cases, the solution presented below provides the appropriate solution method . 3. The correct answer is (d). For a thermodynamic cycle, the change in any thermodynamic property of the system (including the energy) is zero, since the system returns to its initial state following execution of the cycle. If E sys = 0, then by the first law of thermodynamics the net energy transfer to the system must also be zero. However, the individual components that contribute to the net energy
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Unformatted text preview: transfer need not be zero. As an example, consider a cyclic process that occurs to a closed system (no mass transfer) for which Q = 100 kJ (heat input) and W = 100 kJ (work output). For this process, the net energy transfer to the system is zero, even though Q and W are both nonzero. 1 & 2: San Francisco State University ENGR 303: Engineering Thermodynamics School of Engineering Prof. Ed Cheng, Spring 2011 HW 1 solutions 2 5. The correct answer is (a): 0.81 or 81%. The combined or overall efficiency is the product of the individual efficiencies. Ref. discussion in textbook, section 2-7. 4: San Francisco State University ENGR 303: Engineering Thermodynamics School of Engineering Prof. Ed Cheng, Spring 2011 HW 1 solutions 3 6:...
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Homework Solution - transfer need not be zero. As an...

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