Air contained in a piston-cylinder assembly undergoes the power cycle shown in the figure below. P (bar) 6.0 1.0 3 Isothermal process 2 1.0 6.0 v (m³/kg) Assuming ideal gas behavior for the air, evaluate the thermal efficiency of the cycle. = i 24.723 % do
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- Air contained in a piston-cylinder assembly undergoes the power cycle shown in the figure below. P (bar) 6.0 1 1.0 3 Isothermal process 2 0 1.0 6.0 v (m³/kg) Assuming ideal gas behavior for the air, evaluate the thermal efficiency of the cycle. n = i %Steam enters a turbine at 15bar and 600°C with a rate of 0.371 kg/s. The steam expands to 0.08 bar with quality at 90%. Stray heat transfer and kinetic and potential energy effects are negligible. For operation at steady state, • the volume flowrate at the turbine outlet is m³/s, ⚫the power developed by the turbine is ⚫and the temperature at the turbine exit is kW, °C.Steam enters a turbine at 30 bar, 300°C (u = 2750 kJ/kg, h = 2993 kJ/kg) and exits the condenser as saturated liquid at 15 kPa (u = 225 kJ/kg. h = 226 kJ/kg). Heat loss to the surrounding is 50kJ/kg of steam flowing through the turbine. Neglecting changes in kinetic energy and potential energy, the work output of the turbine (in kJ/kg of steam) is
- B. A Carnot engine operates between two temperature reservoirs maintained at 200°C and 20 °C, respectively. If the desired output of the engine is 15 kW, as shown in Fig. below, determine the heat transfer from the high-temperature reservoir and the heat transfer to the low-temperature reservoir. TH-200°C On Engine QL T₁ - 20°C W 15 kWA 10-kg mass of superheated refrigerant-134a at 1.2 MPa and 70°C is cooled at constant pressure until it exists as a compressed liquid at 20°C. (a) Show the process on a T-v diagram with respect to saturation lines. (b) Determine the change in volume. (c) Find the change in total internal energy.A certain fluid has an enthalpy 1800 KJ/kg and 500 KJ/kg work flow. Find the internal energy.
- A vapor compression refrigeration cycle uses steam as the working fluid. Steamflows steadily with a mass ow rate of 0.5 kg/s. Saturated vapor at 2.0 o C (State 1) enters an uninsulated compressor and it is compressed to 0.35 bar (State 2). Heat transfer at the rate of 105 kJ/s occurs from the compressor to its surroundings and the heat transfer exactly balances the entropy generation rate so that s2 = s1. The boundary and surrounding temperature of the compressor is measured to be 26.67 o C. Steam exits as saturated liquid at 0.34 bar (State 3) from the condenser. Steam leaving the condenser is then throttled in an expansion valve (State 4) before entering a constant pressure evaporator to complete the thermodynamic cycle. (a) Calculate the power (kJ/s) for the compressor. (b) Determine the isentropic efficiency (%) of the compressor. (c) Calculate the entropy generation for the compressor. (d) Find the coefficient of performance of the refrigeration cycle. (e) Show the cycle on T-s…A 9.00-mol sample of H₂ gas is contained in the left side of the container shown below, which has equal volumes on the left and right. The right side is evacuated. When the valve is opened, the gas streams into the right side. H₂ Valve Vacuum (a) What is the entropy change of the gas? J/K (b) Does the temperature of the gas change? Assume the container is so large that the hydrogen behaves as an ideal gas. The temperature decreases. O The temperature increases. The temperature does not change. ✓Calculate the specific heat of the material in J/g-deg C if material of 10 kilograms raises by 2 deg C when 2000 joules of heat is added. O 100 O 50 O 0.1 O 0.2 O none of the above
- Calculate the temperature of 0.39 mole of Xenon gas that occupies 9850 millimeters under a pressure of 631 torr.:A rigid tank contains 5 kg of saturated vapor steam at 100°C. The steam is cooled to the ambient temperature of 25°C. a) Determine the entropy change of the steam, in KJ/K b) For the steam and its surrounding, determine the total entropy change associated with this process, in KJ/K.Prove that k = 1.35 in the problem: The internal energy of a certain ideal gas is given by the expression u = 850 + 0.529 Pv Btu/lb. where P is in psia. Identify the exponent k in the Pvk = C for this gas undergoing in an isentropic process.