Feed water heaters are used to preheat water before entering the boiler of a steam power plant by mixingcold water with steam bled from some middle stages of the turbine. The feed water heater shown in thefigure is assumed steady-flow. The device is not fully insulated, and 400 kW heat is rejected to theenvironment at the temperature of 27°C during the process. Calculate the rate of total entropy generationfor the system. States at inlets and outlet of the feed water are specified in the figure.%3DZloss= 400kWState 3: P2=1.4 MPaT= 180°CState 1: P=1.4 MPaT= 50°Cm, = 5 kg / sFeed WaterHeaterState 2: P=1.4 MPaT= 300°C

Assumption took to this question:- 1. Steady flow device 2. Kinetic and potential energy are…

Answered: Feed water heaters are used to preheat…

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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Problem 4 An air compressor is to be powered by a direct-coupled steam turbine (as shown in the figure below) that is also driving a generator. Steam enters the turbine at 13 MPa and 500 C at a rate of 20 kg/s and exits at 15 kPa and a quality of 0.85. Air enters the compressor at 98 kPa and 295 K at a rate of 7 kg/s and exits at 1 MPa and 600 K. Calculate the net power delivered to the generator.
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A high pressure steam turbine receives steam from a boiler under unknown conditions. The isentropic efficiency of the turbine is 75% and it produces 1MW. The high pressure turbine outlet steam is at 1.4 MPa under saturated conditions. The high pressure turbine exhaust supplies 1000kg/min for use in a process, in addition to an unknown flow of steam that follows the path, being supplied to a low pressure turbine that produces 820kW when it releases steam at 10kPa and has a isentropic efficiency of 60%. The steam that was used for the process (out of the high pressure turbine) after being used, returns to the cycle taken by the pump, which also takes the outlet of the condenser and does so at 10kPa as saturated liquid. Consider the efficiency of the pump equal to 90%. Determine: A) the mass flow through the boiler B) the pressure and temperature at the outlet of the boiler C) the thermal efficiency of the cycle
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