a. What physical phenomena causes the pressure to drop from point 4-5 (and point 1-2)? b. Define the following types of processes: • an isothermal process is a constant process. an isobaric process is a constant _process. An isenthalpic process is a constant _process. • An isometric process is a constant process. • An isentropic process is a constant_ _process. An adiabatic process does not transfer heat to the

a. What physical phenomena causes the pressure to drop from point 4-5 (and point 1-2)? b. Define the following types of processes: • an isothermal process is a constant process. an isobaric process is a constant _process. An isenthalpic process is a constant _process. • An isometric process is a constant process. • An isentropic process is a constant_ _process. An adiabatic process does not transfer heat to the

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

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A dry steam geothermal power plant is operating on the Rankine cycle under the following conditions:• Plant electric power output Pel = 64 MW• Dry saturated steam pressure at the turbine inlet p1 = 40 bars• Pressure and dryness fraction of wet saturated steam at turbine exit: p2 = 0.05 bar and x2s = 0.7 (after isentropic expansion)• Direct contact condenser pressure p2 = 0.05 bar• Turbine isentropic efficiency ηit = 0.92• Combined mechanical and electrical efficiency of turbine–generator ηtg = 0.96• Plant capacity factor CF = 0.95 Calculate: (a) the plant net specific work, (b) the plant thermal efficiency, (c) the plant overall (electrical) efficiency, (d) the plant steam rate, (e) the plant annual power generation, and (e) the plant rate of heat rejection. Ignore work of the feed pump.
An ideal Rankine cycle operates between the pressure limits of 15,000 kPa in the boiler and 15 kPa in the condenser. If the turbine inlet temperature is 500 deg C and the cycle produces 2500 kW of net work, determine the mass flow rate of the steam in kg/s. Refer to the tables below. a. 1.993 b. 2.122 c. 1.856 d. 2.016
A 1000-MW supercritical double-reheat steam power plant operates withthe main (live) steam condition of 250 bars and 560°C and the condenserpressure of 0.04 bar. The steam is reheated first at 30 bars to 560°C andthen at 4 bars to 560°C. The turbine efficiency is 0.92. The feed pumpwork may be ignored. Calculate: (a) the plant net specific work, (b) the plant thermal efficiency, (c) the plant steam mass flow rate, and (d) the plant heat rate.
10- A steam power plant with a power of 210 MW operates according to the simple ideal Rankine cycle. The steam enters the turbine at 10MPa pressure and 500 ºC and is cooled in the condenser at 10 kPa pressure. Calculate the mass flow of steam. A-164,7 kg/sB-96,3 kg/sC-35,4 kg/sD-65,8 kg/sE-154,9 kg/s (Note: This question is Turkish) orginal question: 210 MW gücünde bir buharlı güç santrali basit ideal Rankine çevrimine göre çalışmaktadır. Buhar türbine 10MPa basınç ve 500 ºC sıcaklıkta girmekte ve yoğuşturucuda 10 kPa basınçta soğutulmaktadır. Buharın kütlesel debisini hesaplayınız.
A steam-powered power plant works on the basic Rankine cycle.shown in the figure. Likewise, some of its thermodynamic states are summarized in the attached table.Knowing that the work per unit mass delivered to the pump is ›W = 2480 (J/kg], determinein SI units the following: a) The specific volume of water in state 4.b) The associated work per unit mass, developed in the Curbina.c) The associated heat per unit mass released by the water in the condenser.d) The efficiency of the cycle
A dual-pressure combined-cycle power plant consists of a gas turbine,HRSG, and steam turbine plant. The gas turbine exhaust gas flow rate is590 kg/s, temperature is 608°C, HP superheated steam condition is 140bars and 550°C temperature, LP saturated steam is at 8 bar, condenserpressure is 0.05 bar, and feedwater temperature is 120°C. Assuming apinch point of 11 K for both high and low pressure, an exhaust gas specific heat of 1.05 kJ/(kg K), and an isentropic efficiency of the steamturbine of 0.9, calculate (a) the total steam production rate of the HRSG inkg/s, (b) the HRSG heat transfer rate in kJ/s, (c) the stack gas temperaturein °C, and (d) the steam turbine power output in kW.
Consider a water-ammonia binary vapor cycle consisting. In the steam cycle,superheated vapor enters the turbine at 7 MPa, 450oC, and saturated liquid exits thecondenser at 55oC. The heat rejected from the steam cycle is provided to the ammoniacycle, producing saturated vapor at 45oC, which enters the ammonia turbine.Saturated liquid leaves the ammonia condenser at 1 MPa. For a net power output of24 MW from the binary cycle, determine (c) the rate of heat input to the ammoniacycle, in MW, (d) the rate of heat addition to the binary cycle, in MW, and (e) thethermal efficiency of the binary vapor cycle.
A steam-powered power plant works on the basic Rankine cycle.shown in the figure. Likewise, some of its thermodynamic states are summarized in the attached table.Knowing that the work per unit mass delivered to the pump is 3W4 = 2480 (J/kg], determinein SI units the following: a) The specific volume of water in state 4.b) The associated work per unit mass, developed in the Curbina.c) The associated heat per unit mass released by the water in the condenser.d) The efficiency of the cycle
1.5An ideal Rankine cycle with reheat uses water as the working fluid. As shown in the figure below, the conditions at the inlet to the first turbine stage are 1600 lbf/in.2, 1200°F and the steam is reheated to a temperature of T3 = 800°F between the turbine stages at a pressure of p3 = p2 = 200 lbf/in.2 For a condenser pressure of p5 = p4 = 1 lbf/in.2, determine:(a) the quality of the steam at the second-stage turbine exit. h6≈h5+v5(p6−p5)h6≈h5+v5(p6-p5)Determine the quality of the steam at the second-stage turbine exit. x4 =(b) the cycle percent thermal efficiency.
A 258-MW steam power plant operates on the Rankine cycle but with turbine and pump efficiencies of 90%. The steam enters the turbine at 10,000 kPa and 550°C. It discharges to the condenser at 50 kPa. Determine the rate of heat rejection to the environment in the condenser in MW.
1. A Rankine cycle with reheating has a throttle pressure of 135 bars at the turbine inlet and 28 bars reheatpressure, the throttle and reheat temperature of the steam is 550C, condenser pressure is 0.035 bar, massflow rate of steam is 10 kg/sec. Draw the T-s and schematic diagram of the cycle and determine the following:(a) ideal turbine work(b) ideal pump work(c) theoretical thermal efficiency(d) the steam rate(e) heat rate of the cycle(f) actual work of the pump if pump isentropicefficiency is 89%(g) actual turbine work if turbine isentropic efficiencyis 90%
Consider the secondary side of a simplified PWR plant consisting only of the steam generator, turbine, condenser, and the feedwater pump. This plant is operating in an ideal Rankine cycle and producing dry saturated steam at a rate of 5.674E6 kg/h and at a pressure of 7 MPa. A two-phase mixture leaves turbine and enters the condenser at 0.0075 MPa. The feedwater pump demands 9.4 kJ/kg at steady state to pump water from the condenser to the steam generator. A river flowing adjacent to the plant provides the cooling water to the condenser. According to regulations, the rise in the temperature of the river water exiting the plant must not exceed 8 C. Find a) plant thermal efficiency, b) maximum efficiency, and c) the flow rate of the circulating water through the condenser tubes. [Ans.: 36.7%, 43.9%, and 9.3E8 kg/h]