FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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In a steam turbine steam at 2 MPa, 360°C is
expanded to 8 kPa. 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 the cycle
efficiency.
3(360°C)
2 MPa
8 kPa
A small power plant produces 25 kg/s steam at 3 MPa, 600 degrees Celsius in the boiler. It cools the condenser with the ocean water coming in at 12 degrees Celsius and returning at 15 degrees Celsius so the condenser exit is at 45 degrees Celsius. Find the net power output and the required mass flow rate of ocean water.
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. (
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- The turbine section in a jet engine receives gas (assume air) at 1200 K, 800 kPa with an ambient atmosphere at 80 kPa. The turbine is followed by a nozzle open to the atmosphere and all the turbine work drives a compressor receiving air at 85 kPa, 270 K with the same flow rate. Find the turbine exit pressure P₂ so the nozzle has an exit velocity of 800 m/s.arrow_forwardSteam 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 ratearrow_forward2. An ideal turbine with one stage of reheat receives steam at 8 MPa, 500°C. Reheat pressure is 0.8 MPa and exhaust pressure is 0.005 MPa. The work is 1,560 and the kg thermal efficiency is 82%. Find the temperature of the steam leaving the reheater.arrow_forward
- Cogeneration is often used where a steam supply is needed for industrial process energy. Assume a supply of 5 kg/s steam at 0.5 MPa is needed. Rather than generating this from a pump and boiler, the setup in below. is used so the supply is extracted from the high-pressure turbine. Find the power the turbine now cogenerates in this process. 2 3 HP LParrow_forwardPlease help me solve this as soon as possible, and I will surely leave you a like.arrow_forward1.In a steam power plant, steam enters the turbine at a pressure of 7.2 Mpa and 550°C and exhaust at 20 Kpa. The turbine inlet is 3 m higher than the turbine exit. Inlet velocity of steam 20 m's, and outlet velocity of 100m/s. a) Calculate the required steam flow for a 2MW plant capacity b.) with 90% stage efficiency, find the quality and enthalpy of exhaust steamarrow_forward
- In the open-circuit steam plant, boiler feed water at atmospheric pressure 1 bar and 35oC is pumped into an oil-fired boiler which produces dry-saturated steam at 10 bar. This steam enters a steam turbine and is expanded isentropic ally to atmospheric pressure and freely discharged into the atmosphere. Find The thermal efficiency of the plant. The work ratio The specific steam consumptionarrow_forward1. 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.arrow_forwardAn ideal turbine with one stage of reheat receives steam at 8 MPa, 500 degree C. Reheat pressure is 0.8 MPa and exhaust pressure is 0.005 MPa. The work is 1,560 kj/kgand the thermal efficiency is 82%. Find the temperature of the steam leaving the reheater.arrow_forward
- An ideal reheat turbine with one stage of reheat receives steam at 8.0 MPa, 480 ̊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 thereheater.arrow_forwardAn 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.arrow_forwardSteam 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。arrow_forward
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