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Unformatted text preview: Assignment 9
Gas Power Cycles D60 An airstandard Otto cycle has a compression ratio of 8.5. At the beginning of
compression, p1 = 100 kPa and T1 = 300 K. The heat addition per unit mass of air is 1400
kJ/kg. Determine (a) the net work, in kJ per kg of air, (b) the thermal efﬁciency of the
cycle, (c) the mean effective pressure, in kPa, (d) the maximum temperature in the cycle,
in K, and (e) To investigate the effects of varying compression ratio plot each of the
quantities calculated in parts (a) through (d) for compression ratios ranging from 1 to 12. D61 Solve Problem D8.1 on a cold airstandard basis with speciﬁc heats evaluated at 300
K. D62 The conditions at the beginning of compression in an airstandard Diesel cycle are
ﬁxed by p; = 200 kPa, T1 = 380 K. The compression ratio is 20 and the heat addition per
unit mass is 900 kJ/kg. Determine (a) the maximum temperature, in K, (b) the cutoff
ratio, (0) the net work per unit mass of air, in kJ/kg, (d) the thermal efﬁciency, (e) the 4 mean effective pressure, in kPa, and (f) To investigate the effects of varying compression
ratio, plot each of the quantities calculated in parts (a) through (e) for compression ratios ranging from 5 to 25 . D63 The rate of heat addition to an air—standard Brayton cycle is 5.2E8 Btu/h. The
pressure ratio for the cycle is 12 and the minimum and maximum temperatures are 520°R
and 2800°R, respectively. Determine (a) the thermal efﬁciency of the cycle, (b) the mass
ﬂow rate of air, in lb/h, and (c) the net power developed by the cycle, in Btu/h. D64 Solve Problem 8.4 on a cold airstandard basis with speciﬁc heats evaluated at
520°R. D65 Air enters the compressor of a regenerative gas turbine with a volumetric ﬂow rate
of 1.4E5 ft3/min at 14 lbf/inz, 540°R, and is compressed to 70 lbf/inz. The air then passes
through the regenerator and exits at 1060°R. The temperature at the turbine inlet is
1540°R. The compressor and turbine each have an isentropic efﬁciency of 80%. Using
an airstandard analysis, calculate (a) the thermal efﬁciency of the cycle, (b) the
regenerator effectiveness, and (c) the net power output, in Btu/h. g College of Engineering . go
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 Spring '09
 Davis
 Thermal efficiency, compression ratio, mean effective pressure, cold airstandard basis, Q UNIVERSITY

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