FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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In a Rankine cycle, steam leaves the boiler and enters the turbine at 4 MPa, 400C. The condenser pressure is 10 kPa. What is the pump work in kJ/kg?
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?
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.
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- 10 0.9967. Ans. H.W 2 A smaller power plant produces steam at 3 MPa, 600 C, in the boiler. It keeps the condenser at 45 C by the transfer of 10MW out as heat transfer. The first turbine section expands to 500 kPa, and then flow is reheated followed by the expansion in the low-pressure turbine. Find the reheat temperature so that the turbine output is saturated vapor. For this reheat, find the total turbine power output and the boiler heat transfer. Answer. (Reheat temperature= 529°C , total turbine power output= 6487 kW, the boiler heat transfer= 16 475 kW)arrow_forwardSee photo belowarrow_forwardA steam power plant has a steam generator exit at 4 MPa, 600 ℃ and a condenser exit temperature of 45 ℃. Assume all components are ideal and find the cycle efficiency and the specific work and heat transfer in the components, (wt, wc, qh, ql, ηth=?).arrow_forward
- 2. 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_forward9.13 A steam power plant should produce 10 MW net work. Steam flows at 5 MPa, 500°C to the turbine which has a condenser exit at 50°C. Find the mass flow rate of steam needed. 9.14 For the previous problem find all the specific work and heat transfer terms and the cycle efficiency.arrow_forwardН.W A smaller power plant produces steam at 3 MPa, 600•C, in the boiler. It keeps the condenser at 45 C by the transfer of 10MW out as heat transfer. The first turbine section expands to 500 kPa, and then flow is reheated followed by the expansion in the low-pressure turbine. Find the reheat temperature so that the turbine output is saturated vapor. For this reheat, find the total turbine power output and the boiler heat transfer. [Answer. (Reheat temperature= 529°C , total turbine power output= 6487 kW, the boiler heat transfer= 16 475 kW)]arrow_forward
- 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.arrow_forwardWater at 55°C is cooled in a The temperature of the surrounding air is from the condenser is 2,300,000 kJ/h. Find the capacity in liters per second of the pump used in the cooling tower. cooling tower which has 32°C dry bulb and 70% RH. an efficiency of 65%. The heat dissipatearrow_forwardIn a steam power plant that uses reheat cycle steam at 15.5 MPa, 545 °C enters the engine and expands to 1.95 MPa. At this point the steam is withdrawn and passes through a reheater. It reenters the engine at 535 °C. Expansions now occur to the condenser pressure of 0.0035 MPa. Find the efficiency in %.arrow_forward
- A smaller power plant produces 25 kg/s steam at 3 MPa, 600o C in the boiler. It cools the condenser with ocean water so the condenser exit is at 45o C. There is a reheat done at 500 kPa up to 400o C and then expansion in the low pressure turbine. For the engine find W and ?? .arrow_forwardAnother.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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