A turbine operates under the following conditions, steam being bled off from two stages for feed heating purposes: Initial steam pressure Initial steam temperature Steam pressure in first heater Steam pressure in second heater Exhaust pressure Condensate temperature Feed temperature after second heater Feed temperature after first heater The bled steam is condensed in the feed heaters and there is no cooling of the condensate. The drains from the first heater are passed through a steam trap into the second heater and the combined drains from the second heater are pumped by a drain pump into the feed pipe after the second heater. If the internal power developed by the turbine is 12000 kW, find the required capacity of the heater drain pump. The efficiency ratio of the turbine is 0.8. P= P=6 30 bar 400°C m2 39°c j11-m,-m2) 6 bar 1 bar 0.07 bar 39°C 95°C 154°C TRAP O (m, +m2) 95°C 154°C

A turbine operates under the following conditions, steam being bled off from two stages for feed heating purposes: Initial steam pressure Initial steam temperature Steam pressure in first heater Steam pressure in second heater Exhaust pressure Condensate temperature Feed temperature after second heater Feed temperature after first heater The bled steam is condensed in the feed heaters and there is no cooling of the condensate. The drains from the first heater are passed through a steam trap into the second heater and the combined drains from the second heater are pumped by a drain pump into the feed pipe after the second heater. If the internal power developed by the turbine is 12000 kW, find the required capacity of the heater drain pump. The efficiency ratio of the turbine is 0.8. P= P=6 30 bar 400°C m2 39°c j11-m,-m2) 6 bar 1 bar 0.07 bar 39°C 95°C 154°C TRAP O (m, +m2) 95°C 154°C

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

solve part A only not others
! Required information Consider an ideal gas-turbine cycle with two stages of compression and two stages of expansion. The pressure ratio across each stage of the compressor and turbine is 3. The air enters each stage of the compressor at 300 K and each stage of the turbine at 1200 K. Use variable specific heats. Determine the back work ratio and the thermal efficiency of the cycle, assuming a regenerator with 79 percent effectiveness is used. The back work ratio is The thermal efficiency is [ %. 1%.
1. In a reheat cycle steam at 15 MPa, 500oC enters the engine and expands to 2 MPa. At this point the steam is withdrawn and passed through a reheater. It reenters the engine at 500oC. Expansion now occurs to the condenser pressure of 5 kPa. The steam flow is 150000 kg/hr, the generator efficiency is 96%, mechanicalefficiency of 80% and indicated steam rate of 5.5 kg/kWh. For actual engine, find the following:a. output power in kWb. brake steam ratec. brake thermal efficiencyd. combined engine efficiency 2. An ideal reheat Rankine cycle operates between 8 MPa and 5 kPa with a maximum temperature of 600oC. Two reheat stages, each with a maximum temperature of 600oC are to be added to 2 MPa and 100 kPa. Calculate:a. turbine workb. heat added in the boilerc. heat added in the reheaterd. thermal efficiency
A gas turbine cycle with two stage of compression and two stage of expansion, the overall pressure ratio is 9, air enters each stage of compression at 298 K and each stage of turbine at 1200 K. Determine the thermal efficiency of the cycle under the following conditions:- 1- no heat exchanger is used. 2- ideal regenerator is used
In an ideal reheat-rgenerative cycle, steam enters the turbine at 6 MPaa and 400 degrees Celsius. After expansion to 1.4 MPaa steam is withdrawn and reheated to 300 degrees Celsius . Extractions for regenerative heating occur at 0.15 MPaa and 1.4 MPaa and the condenser pressure is 0.1 MPaa. Use mass flowrate of 1 kg/s.
A Brayton cycle is used to estimate the performance of an aircraft engine with nitrogen as the working fluid. The engine generates a net power of 10 MW. Nitrogen enters the compressor of the engine at 250 K and 80 kPa and is compressed to a pressure of 400 kPa. The gas exits the turbine of the engine at 450 K and 80 kPa.a. Calculate the mass flow rate of nitrogen through the engine.b. Calculate the thermal efficiency of the cycle.c. Determine the irreversibility per unit mass for each process and for the cycle if TH = 1500 K and TL = To = 250 K.d. Which process has the largest irreversibility?
In a gas turbine generating set two stages of compression are used with an intercooler between stages. The HP turbine drives the HP compressor, and the LP turbine drives the LP compressor and the generator. The exhaust from the LP turbine through a heat exchanger which transfer heat to the air leaving the HP compressor. There is a reheat combustion chamber between turbine stages which raises the gas temperature to 8000C, which is also the gas temperature at entry to the HP turbine. The overall pressure ratio is 30, each compressor having the same pressure ratio, and the air temperature at entry to the unit is 300C. The heat exchanger thermal ratio may be taken as 0.75, and intercooling is complete between compressor stages. Assume isentropic efficiencies of 0.85 for both compressor stages, and 0.9 for both turbine stages, and the 4% of the work of each turbine is used in overcoming friction. Neglecting the losses in pressure, and assuming that velocity changes are negligibly small,…
A power station consists of a four-unit coal fired power station, having a combined capacity of 2,880 MW. The current efficiency of each unit is around 37.7%. You are asked to improve the thermal efficiency of each unit by lowering the condenser pressure. To simplify this task, assume that each unit operates on a simple ideal Rankine cycle. If the superheated vapour enters the turbine at 10 MPa and 500 ֯C and is cooled in the condenser at a lower pressure 10 kPa, determine the quality of the steam at the turbine exit and the thermal efficiency of the cycle for one unit.
The following is how a reheat turbine works. It takes steam with a pressure of 1560 psi and a temperature of 780 F and expands it to 430 psi. The steam now returns to the boiler to be resuperheated before returning to the turbine at 410 psi and 600 F. The steam then expands to the condenser temperature of 96 F. Calculate the efficiency of the cycle.
A Joule cycle is used for electricity production in a power plant. Air is introduced to the cycle from the ambient with a pressure of 1 bar, and a temperature of 20 °C. The air is compressed in compressor C1 and is thereafter cooled down to 30 °C. The air is compressed again in compressor C2. The air passes through a regenerator where it is heated by exhaust gases. Heat is added by combustion of fuel in combustion chamber CC1. The air is thereafter expanded in turbine T1. The air is reheated in combustion chamber CC2. The air is expanded in turbine T2, and the exhaust gases after the turbine pass through the regenerator and is finally vented to the ambient. Turbine T2 is driving compressor C2. The net work from the cycle is produced by the difference between the work produced by turbine T1 and compressor C1. The regenerator efficiency is 0.80, the isentropic efficiency of the compressor is 0.83, and for the turbine 0.85. The temperature after CC1 and CC2 is tCC, the pressure after…