Chapter 9, Problem 9.106EP

2.A steam throttling valve with inlet conditions of 3MPA and 500C is connected to the inlet of the turbine. The turbine has 800kW power output and heat absorbed of 500kw. If the mass flow rate is 1kg/s and the exit temperature of steam is 400C, find the exit turbine pressure. (

An ideal reheat turbine with one stage of reheat receives steam at 8.0 MPa, 500° C. Reheat pressure is 0.83 MPa and exhaust pressure is 0.007 MPa. The work is 1559 kJ/kg and the thermal efficiency is 41.05%. Find the temperature of steam leaving the reheater.

1. In a Regenerative cycle, the steam is extracted from the turbine at 2 Mpa and 250C for feedwater heating and it is mixed with condenser exit at 30 kpa after pumping. Find the fraction of vapor extracted from the turbine.

In a steam turbine steam at 20 bar, 360°C is expanded to 0.08 bar. It then enters a condenser, where it is condensed to saturated liquid water. The pump feeds back the water into the boiler. Assume ideal processes, find per kg of steam the net work and cycle efficiency.

Steam engine with incomplete expansion receives saturated steam at 1.04 Mpa,expands it to 0.105 Mpa where release occurs. Exhaust is to a condenser at 40C.The actual engine uses 6070 kg/h of steam; it has a brake engine efficiency of 60%and a mechanical efficiency of 85%. The electric generator which it drives has anefficiency of 925. (a) For the ideal engine, find the thermal efficiency and the mep.For the actual engine, determine (b) the brake work in kW and the brake thermalefficiency, (c) the indicated work in kW, indicated thermal efficiency and indicatedsteam rate, (d) the combined thermal efficiency and the combined steam rate

A smaller power plant produces 25 kg/s steam at 3 MPa, 600°C in the boiler. It cools the condenser with ocean water so the condenser exit is at 45°C. There is a reheat done at 500 kPa up to 400°C and then expansion in the low pressure turbine. For the engine, find W and e?

An Otto cycle has a heat rejected of 300 kJ and work of 700 kJ. Find the cycle efficiency.

An ideal reheat turbine with one stage of reheat recieves steam at 8.0 Mpa,500°c.Reheat pressure is 0.83 Mpa and exhaust pressure is 0.007 mpa. The work is 1559kj/kg and the thermal efficiency is 41.05%.Find the temperature of steam leaving the heater.

Steam at 6.2 MPa and 480°C is received by a regenerative engine. Extractions for feedwaterheating occurs at 3 MPa and again at. 1.4 MPa,with the remaining steam expanding to0.0065 MPa. For the ideal engine with a throttla flow of 54,500 kg/h, find the hourlyquantities of steam ex-tracted, the turbine work in kW, and the thermal efficiency. For an ideal cycle through the same states, calculate Q and e。