Chapter 8, Problem 8.10P

- =2 A reversible power cycle R and an irreversible power cycle I te between the same two reservoirs. Each receives Qy from the hot reservoir. reversible cycle develops work Wy while the irreversible cycle develops work Wy. (a) Evaluate the rate of entropy generation o for cycle Iin terms of Wy, Wg and the rature Te of the cold reservoir. (b) Demonstrate that ¢ must be positive.

5. Gaseous nitrogen actuates a Carnot power cycle in which the respective volumes at the four corners of the cycle, starting at the beginning of the isothermal expansion, are Vi 10.10 L, V2 = 14.53 L, V3 = 226.54 L, and %3D V4 = 157.73 L. The cycle receives 21.1 kJ of heat. Determine the work and the mean effective pressure.

Need help with this engineering problem.   Steam enters the turbine of a simple vapor power plant with a pressure of 12 MPa and a temperature of 500°C and expands adiabatically to condenser pressure, p. Saturated liquid exits the condenser at pressure p. The isentropic efficiency of both the turbine and the pump is 84%.For p = 100 kPa, determine: (a) the turbine exit quality, in percent.(b) the cycle thermal efficiency, in percent.

Gaseous Methane actuates a Carnot power cycle in which the respective volumes at the four corners of the cycle,starting at the beginning of the isothermal expansion, are V1 = 10.10 L, V2 = 14.53 L, V3 = 226.54 L, and V4 157.73L. The cycle receives 21.1 kJ of heat. Determine a) the work and b) the mean effective pressure.

A turboprop engine consists of a diffuser, compressor, combustor, turbine, and nozzle. The turbine drives a propeller as well as the compressor. Air enters the diffuser with a volumetric flow rate of 83.7 m3/s at 40 kPa, 240 K, and a velocity of 180 m/s, and decelerates essentially to zero velocity. The compressor pressure ratio is 10 and the compressor has an isentropic efficiency of 85 %. The turbine inlet temperature is 1,140 K, and its isentropic efficiency is 85 %. The turbine exit pressure is 50 kPa. Flow through the diffuser and nozzle is isentropic. Sketch the process on the T-s diagram and using an air-standard analysis, determine, the power delivered to the propeller, in MWt the velocity at the nozzle exit, in m/s.  Neglect kinetic energy except at the diffuser inlet and the nozzle exit.

Derive the formula of efficiency of the following: a. Otto Cycle in terms of compression ratio r and specific heat ratio k

103#1.  the working substance for a Carnot cycle is 8lbm of air. the volume at the beginning of isothermal expansion is 9cu ft and the pressure is 300 psia. the ratio of expansion during addition of heat is 2 and the temperature of the cold body is 90degree F. find (a)QA, (b) QR, (c) V3, (D)p3 ,(e) V4, (f) p4, (g) pm, (h) the ration of expansion during thge isenthropic process and (i) the overall ration of compression.

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Please solve it fast , Hurry.