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Prelim_1_problem_2

# Prelim_1_problem_2 - problem the power strokes are...

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Prelim #1 - Problem #2. Known: thermodynamic cycle with 3 different states. Find: p-v diagram; W cycle ; Power strokes; Work power Analysis: a) p-v diagram, from the given data, we can determine the pressure and volume at 3 states. P(mPa) V(m 3 ) 0.1, 0.5 0.6, 2 0.1, 3.5 0.1 0.6 3.5 0.5 2.0 b) For a cycle, W cycle = Q cycle W cycle = Q cycle = area of the triangle = (1/2) * (3.5-0.5)(m 3 ) * (0.6-0.1)(mPa) = 0.75 mJ = 750 kJ c) Power strokes are the strokes which output power to the surroundings. In this
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Unformatted text preview: problem, the power strokes are processes 1-2 and 2-3 d) Work power is the work by processes 1-2 and 2-3. On the p-v diagram, its value is the area under the line of 1-2-3, including the part which is under 3-1. Work Power = area under 1-2-3 = W cycle + area under 3-1 =0.75 mJ + 0.1(mPa) * (3.5-0.5)(m 3 ) = 1.05 mJ = 1050 kJ...
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