9.8 At the beginning of the compression process of an Otto cycle, p, = 14.7 lbf/in.² and T, = 530°R. The maximum cycle temperature is 3000°R. On a cold air-standard basis using k = 1.4, determine the net work developed, in Btu per unit mass of air, the thermal efficiency, and mean effective pressure, in lbf/in.², for compression ratios of 6, 8, and 10.

Q5/ Steam enters a turbine with a pressure of 30 bar, a temperature of 400 °C, and a velocity of 160 m/s. Saturated vapor at 100 °C exits with a velocity of 100 m/s. At steady state, the turbine develops work equal to 540 kJ per kg of steam flowing through the turbine. Heat transfer between the turbine and its surroundings occurs at an average outer surface temperature of 350 K. Determine the rate at which entropy is produced within the turbine per kg of steam flowing, in kJ/kg.K. Neglect the change in potential energy between inlet and exit. 30 bar 400°C Surroundings at 293 K P = 30 bar T, = 400°C V, = 160 m/s 1 Wex = 540 kJ/kg 100°C T,= 100°C Saturated vapor V2 = 100 m/s T = 350 K-

At the beginning of the compression process of an air-standard Otto cycle, p₁= 1 bar and T₁ = 300 K. The compression ratio is 8.5 and the heat addition per unit mass of air is 1400 kJ/kg. Determine (a) the net work, in kJ/kg, (b) the thermal efficiency of the cycle, (c) the mean effective pressure, in bar, (d) the maximum temperature of the cycle, in K.

Show that the thermal efficiency of any internal combustion engine can besimplified as a ratio of temperature differences

A power cycle operates between two thermal reservoirs at 1200 K and 400 K, respectively. For each of the three cases below, determine: (i) The net power produced by the cycle, in kW; (ii) The thermal efficiency; and (iii) Use the Clausius inequality and comparisons to the thermal efficiency of a reversible cycle operating between the given temperatures to determine whether the cycle operates in a reversible or irreversible manner, or is impossible. case |  QH(kJ/s)   | QL(kJ/s)   A    |   600           | 400   B    |   600          |   0   C    |   600          |  200

Select the Kelvin-Plank statement of the second law of Thermodynamics___________   A. It is impossible to construct a device that operates in a cycle and produces no effect other than the transfer of heat from a lower-temperature body to a higher-temperature body.     B. It is impossible for any device that operates on a cycle to receive heat form a single reservoir and produce a net amount of work.

The thermodynamic cycle is composed of the following reversible process: Isentropic compression 1-2; isothermal 2-3; constant pressure 3-1 operates on 0.25 lb of air; the compression ratio 1-2 is.rk = 5; T2 = 150°F, p1 = 15 psia. Determine (a)p, V and T at each point, (b) QA, & QR, (c)ŋ and Pm

At the beginning of the compression process of an air-standard Otto cycle, p1 = 1 bar and T1 = 300 K. The compression ratio is 6 and the heat addition per unit mass of air is 1400 kJ/kg. Determine: (a) the maximum temperature of the cycle, in K. (b) the net work, in kJ/kg. (c) the percent thermal efficiency of the cycle. (d) the mean effective pressure, in kPa.

Problems 1. A Carnot power cycle operates on 2 lb of air between the limits of 70°F and 500°F. The pressure at the beginning of isothermal expansion is 400 psia and at the end of isothermal expansion is 185 psig. Determine (a) the volume at the end of isothermal compression, (b) AS during an isothermal process, (c) Q, (d) Q, (e) W, (f) e, (g) the ratio of expansion during isothermal heating and the overall ratio of expansion, and (h) the mean effective pressure.

At the beginning of the compression process of an air-standard Otto cycle, p1 = 1 bar and T1 = 300 K. The compression ratio is 3.5 and the heat addition per unit mass of air is 1200 kJ/kg. Determine: (a) the maximum temperature of the cycle, in K. (b) the net work, in kJ/kg. (c) the percent thermal efficiency of the cycle. (d) the mean effective pressure, in kPa.