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At the beginning of the compression process in an ideal Diesel cycle, the pressure is 15 psia, the temperature is 70°F, and the volume is 6.54 cubic feet. The compression ratio for the cycle is 15, and the heat supplied is 188 BTU. At the end of the compression process, the pressure is 665 psia, and the temperature is 1108°F. Using constant specific heat, calculate the following: a. the maximum temperature in the cycle, °F; b. the temperature at the end of the expansion process, °F; c. the heat rejected, BTU; d. the net cycle work, BTU; e. the thermal efficiency of the cycle, %; f. the horsepower of an engine operating on such a cycle using 0.5 pounds of air per second.
Gordon A.
The conditions at the beginning of compression in an airstandard Diesel cycle are fixed by $p_{1}=200 \mathrm{kPa}, T_{1}=380 \mathrm{~K}$. The compression ratio is 20 and the cutoff ratio is $1.8$. For $k=1.4$, determine (a) the maximum temperature, in $\mathrm{K}$. (b) the heat addition per unit mass, in $\mathrm{kJ} / \mathrm{kg}$. (c) the net work per unit mass, in $\mathrm{kJ} / \mathrm{kg}$, (d) the thermal efficiency. (e) the mean effective pressure, in $\mathrm{kPa}$. (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 .
Gas Power Systems
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The conditions at the beginning of compression in an airstandard Diesel cycle are fixed by $p_{1}=200 \mathrm{kPa}, T_{1}=380 \mathrm{~K}$. The compression ratio is 20 and the heat addition per unit mass is $900 \mathrm{~kJ} / \mathrm{kg}$. Determine (a) the maximum temperature, in $\mathrm{K}$. (b) the cutoff ratio. (c) the net work per unit mass of air, in $\mathrm{kJ} / \mathrm{kg}$. (d) the thermal efficiency. (e) the mean effective pressure, in $\mathrm{kPa}$. (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 .
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