Chapter 8, Problem 8.57P

= 10000 kg/h. Also, the plant has Q2. There are many electrical power plants in Iraq. The rate of steam flow : the following data refer to a simple steam power plant : Calculate : (i) Power output of the turbine. (ii) Heat transfer per hour in the boiler and condenser separately. 65 bar 70 bar 400°C Boiler 1 60 bar, 380°C 4 Wout Pump Turbine G Electricity 2 0.1 bar, 0.9 dry 3 Condenser 0.09 bar Saturated liquid

A 136 kg/s steam with an inlet condition of 52 bar, 400 C enters a rankine turbine and expands to 36 kPa. determine the work, the thermal efficiency, and the steam rate (a) for the cycle, (b) for the turbine. (c) With the same specifications, consider the steam expanded on an actual turbine and the brake steam rate is 4800 g/kwh and the driven electric generator has an efficiency of 0.93. Find Brake Thermal Eff, Brake Engine Eff, Combined Work, and quality or temperature of actual exhaust steam

Steam is delivered to turbine at 5.4 MPa and 600 degree C. Before condensation at 31 degree C, steam is extracted for feed water heating at 0.6 MPa. The turbine exhaust is 60 degree C. the required values of some state point properties are tabulated below. 10. Calculate the net work of the cycle.

2. Steam is supplied to a fully loaded 100-hp turbine at 20 psia with u, Exhaust is at 1 psia with u, v, = 1100 fps. The heat loss from the steam in the turbin is 1 Btu/lb. Neglect potential energy change and determine (a) th work per lb steam and (b) the steam flow rate in lb/h. 1163.3 Btu/lb, v, = 2.65 ft/lb and v, = 400 fps = 925 Btu/lb, v, = 294 ft/lb an %3D %3D Solution p = 200 psia u, = 1163.3 Btu/lb. v = 2.65 ftlb %3D P2 = 1 psia = 925 Btu/lb V2 294 ft31b %3D %3D v, = 400 fps V2 = 1100 fps Q =-10 Btu/lb %3D Turbine W = 100 hp 2- 2 P, + K, + W + U, + Q = P, + K, + W + U, + w f2

Two engines, one of the auto cycle type and the other of the diesel type, have the same compression ratio and the same amount of heat entering, which one is more efficient? Prove it with a diagram.

A generator uses a gas turbine cycle. Air enters the compressor at a pressure of 1 bar and a temperature of 30°C with a compressor efficiency of 0.85. Hot gas exits the combustion chamber at a pressure of 9 bar and a temperature of 900°C. The power generated by the turbine is 2400 kW with a turbine efficiency of 0.82. a. Draw installation diagrams and T-s cycle process diagramd b. Determine the work of the compressor and turbine and the mass rate of the air requirement c. Cycle thermal efficiency (air: Cp=1,005 kJ/kg. K dan γ=1.4; Gas hot: cp=1,005 kJ/kg K and γ=1.4)

In an internal combustion engine, 2/3 of the heat supply takes place at constant volume and 1/3 at constant pressure. The other three condition changes of the engine are two isotropes and one isochore. The compression ratio (Va / Vb) is 10 and the cycle's highest and lowest pressures are 45 bar and 0.9 bar respectively. Work medium is an ideal gas with k = 1.35. All state changes are reversible. Calculate the thermal efficiency. gicd T4 d. qibc e Ec Ec e a S V

T = 300 K and T A gas turbine plant operates on the Brayton cycle between 1073 K. Find the maximum work done per kg of air, and the corresponding cycle efficiency. How does this efficiency compare with the Carnot cycle efficiency operating between the same two temperatures? min max

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