A driver applies the brakes on 1,000 kg automobile to stop from a speed of V = (70 + y/2) km/hr. Find the entropy generation assuming an ambient temperature of Tamb = 20oC:                                                                                                 DS = _______ kJ/K (+ 1%) y=95

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Q17 An ideal gas (Cp = R and C₁ = R), undergoes the following mechanically reversible changes in series of nonflow processes: a) From initial state of 20 °C and 130 kPa, it is compressed adiabatically to 500 kPa. b) It is then cooled to 20 °C at a constant pressure of 500 kPa c) Finally, the gas is expanded isothermally to its original state. Calculate the Q,W, AU and AH for each of three processes and for the cycle.

= 71°C with v₁ = 0.201 m³/kg. The gas v1 A piston-cylinder assembly holds 1.2 kg of air initially at T₁ undergoes a process as an ideal gas and reaches a final state at T2 = 149° C with v2 = Determine the change in entropy AS in kJ/K. Assume c = 0.72 kJ/kg. K. 0.725 m³/kg. (a) AS = Ex: 0.888 kJ/K (b) Is the process adiabatic? Pick (c) What is the direction of heat transfer? Pick Air

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Personal Hotspot : 1 connection(s),Used 41.0 MB Photos 1235/1236 0.05 kg of steam at 10 bar, dryness fraction 0.84, is hcated reversibly in a rigid vessel until the pressure is 20 bar. Calculate the change of entropy and the heat supplied. Show the area which represents the heat supplied on a T-s diagram. Send Set as Add to Edit Delete 发

17. A reversible non-flow, constant volume process decreases internal energy by 316.5 kJ for 2.268 kg of a gas for which R = 430 J/kg-K and k 1.35. For the process, determine the work, heat, change entropy. The initial temperature is 204.4°C.

Saturated vapor water at 100 kPa enters an isentropic compressor and exits at 2 MPa. Note that isentropic implies adiabatic and reversible. a) What is the temperature of the outlet in \deg C. Round to one decimal place. b) How much work, in kJ/kg, must be used for this process? Round your answer to one decimal place. Hint: Don't use temperature to perform the interpolation!

Q1. The adiabatic enthalpy drop in a given stage of a multi-stage impulse turbine is 22.1 16° KJ/kg of steam. The nozzle outlet angle is and the efficiency of the nozzle, defined as the ratio of the actual gain of kinetic energy in the nozzle to adiabatic heat drop, is 92%. The mean diameter of the blades is 1473.2 mm and the revolution per minutes is 1500. Given that the carry over factor is 0.88, and that the blades are equiangular (the blade velocity coefficient is 0.87). Calculate the steam velocity at the outlet from nozzles, blade angles, and gross stage efficiency.

A centrifugal air compressor having pressure compression ratio of 5 compresses air at the rate of 10kg/s. If the initial pressure and temperature of air is 1 bar and 20°C find 1. Final temperature of gas. 2. Power required to drive the compressor. Take y = 1.4 and Cp = 1 kg/kgK.