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 %
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- 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.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 kWSteam 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
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- :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.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 aboveA Carnot engine uses hydrogen as its medium. The volumes at the beginning and end of the reversible adiabatic expansion process are 1.0 ft³ and 2.5 ft3, respectively. Find the thermal efficiency. O 0.5 O 0.2 O 0.8 O 0.3 0.1 O 0.7 O 0.6 O 0.4 O 0.9
- 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.0.05 kg of steam at 1.5 MPa is contained in a rigid vessel of volume of 0.0076 m^3. A. What is the temperature of the steam? B. If the vessel is cooled, at what temperature will the steam be just dry and saturated? C. Cooling is continued until the pressure in the vessel is 1.1 MPa, calculate the amount of vapor at this point. D. Calculate the amount of heat rejected between the initial and the final state. E. Draw the Ts diagram of the whole process.1) A cylinder of volume 50cm made of Pyrex glass is full to the brim with acetone. Suppose the cylinder and acetone are warmed by 30°C. (Coefficient of linear expansion of glass, 3.2 x 10-6K-1 and acetone, 5.0 x 10-5K-1) i. Calculate the change in volume of the glass. ii. Calculate the change in volume of the acetone. ii. Will any acetone spill out of the cylinder? Explain.