A gas turbine is used to drive an electric generator. It consists of two stage compressors...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
A gas turbine is used to drive an electric generator. It consists of two stage compressors with an intercooler between stages, two combustion chambers, two stage turbines and a heat exchanger. The H.P turbine drives the H.P compressor, and the L.P turbine drives the L.P compressor and the alternator. The gas from the L.P turbine passes through the heat exchanger, which transfers heat to the air leaving the H.P compressor. The reheat combustion chamber between turbine stages raises the gas temperature to 600°C, which is also the gas temperature at entry to the H.P turbine. The overall pressure ratio is 10/1; each compressor having the same pressure ratio, and the air temperature at entry to the first stage compressor is 20ºC. Assuming isentropic efficiencies of 0.8 for both compressor stages, and 0.85 for both turbine stages, and that 2% of the work of each turbine is used in overcoming friction, calculate the power output in kW for a mass flow rate of 115 kg/s. The heat exchanger thermal ratio is 0.7, and inter-cooling is complete between compressor stages. Neglect all losses in pressure, and assume that velocity changes are negligibly small. Calculate also the overall thermal efficiency of the plant. For air, take cp = 1.005 kJ/kg.K and y = 1.4 and for gas, take cp = 1.150 kJ/kg.K and y = 1.333. A gas turbine is used to drive an electric generator. It consists of two stage compressors with an intercooler between stages, two combustion chambers, two stage turbines and a heat exchanger. The H.P turbine drives the H.P compressor, and the L.P turbine drives the L.P compressor and the alternator. The gas from the L.P turbine passes through the heat exchanger, which transfers heat to the air leaving the H.P compressor. The reheat combustion chamber between turbine stages raises the gas temperature to 600°C, which is also the gas temperature at entry to the H.P turbine. The overall pressure ratio is 10/1; each compressor having the same pressure ratio, and the air temperature at entry to the first stage compressor is 20ºC. Assuming isentropic efficiencies of 0.8 for both compressor stages, and 0.85 for both turbine stages, and that 2% of the work of each turbine is used in overcoming friction, calculate the power output in kW for a mass flow rate of 115 kg/s. The heat exchanger thermal ratio is 0.7, and inter-cooling is complete between compressor stages. Neglect all losses in pressure, and assume that velocity changes are negligibly small. Calculate also the overall thermal efficiency of the plant. For air, take cp = 1.005 kJ/kg.K and y = 1.4 and for gas, take cp = 1.150 kJ/kg.K and y = 1.333.
Expert Answer:
Answer rating: 100% (QA)
1 Given Mass flow rate 115 kgs Overall pressure ratio 10 Each compressor pressure ratio 10 31622 HP ... View the full answer
Related Book For
Thermodynamics Fundamentals And Engineering Applications
ISBN: 9780521862738
1st Edition
Authors: William C. Reynolds, Piero Colonna
Posted Date:
Students also viewed these accounting questions
-
One challenge student affairs professionals face is demonstrating qualitative outcomes in a quantitative manner. This is necessary to validate the effectiveness of the work of student affairs and...
-
Combustion gas with the composition of Exercise 7.15 at the inlet of the reheated stages of a gas turbine is at 1400 K and 40 bar. The gas expands to atmospheric pressure. Between the high pressure...
-
Given this expression, what can we say about the problem domain? tBoat (BoatSerialNo, BoatType, Manufacturer, Price, Customer, Date Of Sales Rep) SalesRep should not be in the expression at all...
-
Does sound travel faster in warm air than in cold air?
-
A self-priming centrifugal pump is used to pump water at 25C from a reservoir whose surface is 2.2 m above the centerline of the pump inlet (Fig. P1460). The pipe is PVC pipe with an ID of 24.0 mm...
-
Water flows steadily from a tank mounted on a cart as shown in Fig. P5.44. After the water jet leaves the nozzle of the tank, it falls and strikes a vane attached to another cart. The cart's wheels...
-
BlueCo, a domestic corporation, incorporates GreenCo, a new wholly owned entity in Germany. Under both German and U.S. legal principles, this entity is a corporation. BlueCo faces a 35% U.S. tax...
-
1. What is the work required to raise a 100 kilogram barbell 2 meters upwards? 2. What is the velocity of a 500 kg car that is pulled with 10000 N of force for a total distance of 30 meters? Assume...
-
4 A rectangular container with four sides, open top and square bottom is to have 2000 cubic units What are the dimensions of the container with the minimum surface area?
-
Develop a revenue management (maximizing) model based on the information given in the scenario. How many seats should be allocated to each of the 16 itineraries to maximize revenue? What is the...
-
ABC's stock price is $90. The stock price will either increase 10% or decrease 8% in the first month. If the price increases in the first month, it will go up by $12 or down by $15 in the second...
-
a) Give one reason why local Pakistan bus businesses could benefit from Pakistan's crisis. b) Give one reason why local bus businesses could be hurt by the Rupee crisis.
-
Assuming that the assessed valuation of property within the City of Bingham is $1,409,090,909, and the legal general obligation debt limit is 5 percent of assessed valuation, compute the legal debt...
-
:EXAM-STYLE QUESTIONS The points A and B have coordinates (-2,-3,-4) and (-6, -7,-2) 1.0 respectively. The line 1, has equation r = a Show that point A lies on 1. b Show that AB is perpendicular to...
-
You are an audit supervisor of Amethyst & Co and are currently planning the audit of your client, Aquamarine Co (Aquamarine) which manufactures elevators. Its year end is 31 July 2016 and the...
-
Use nodal analysis to determine voltages v1, v2, and v3 in the circuit Fig. 3.76. Figure 3.76 4 S 3i, 2 A 4A
-
2000 kg of oxygen is in a 1.8 m 3 container maintained at 90 K. Calculate the liquid and vapor masses (kg) and the liquid and vapor volumes (m 3 ). Use the tables in Appendix A.8 for data. Data From...
-
One kilogram of R134a is heated in a constant volume container from the critical point to 450 K. How much energy is transferred as heat to the fluid? Use the diagrams or data in Appendix A.4. Data...
-
Propane is to be stored at 4 MPa, 100C. The critical temperature and pressure of propane are equal to 369.8 K and 4.23 MPa, respectively. Estimate the specific volume at these conditions. How large...
-
Someone who exposes the ethical misdeeds of others in an organization is usually called a/an _________. (a) whistleblower (b) ethics advocate (c) ombudsman (d) stakeholder
-
If a manager fails to enforce a late-to-work policy for all workersthat is, by allowing some favored employees to arrive late without penaltiesthis would be considered a violation of _________. (a)...
-
According to research on ethics in the workplace, _________ is/are often a major and frequent source of pressures that create ethical dilemmas for people in their jobs. (a) declining morals in...
Study smarter with the SolutionInn App