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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During the isothermal process of a cannot cycle,the working fluid experiences an entropy change of -0.7Btu/R.If the temperature of the heat sink is 95.Determine the heat transfer in KJ
15m3/sofmoistairat45Cdb,31Cwbandpassesthroughairwasher. If the saturation efficiency is 90%. Determine the air state at the outlet of the air washer.
A completely insulated mixing vessel is designed to deliver water at 60 ⁰Cand atmospheric pressure at a rate of 4 kg/s by mixing two streams of incomingwater in an environment at 25 ⁰C. Saturated steam at atmospheric pressure isinserted on the hot side. Two options are being considered for the cold side: (a)chilled water from the plant at 3 ⁰C or (b) water from the tap at 20 ⁰C (both atatmospheric pressure). 1. Determine the thermal efficiency of each process
Problem • Engine I Referring to the schematic energy flow diagram of a typical automobile engine as shown in Figure. (A) What is the heat lost to the cold reservoir? (B) Calculate the entropy changes in the hot reservoir, the cold reservoir, and the engine, respectively. (C) What is the thermal efficiency of the engine? (D) Compute the Reversible (Carnot) efficiency and the Second-Law Efficiency Hot reservoir 460K (187C) Heat 1200 J Useful work 320I Engine system Cold reservoir 325K (52°C)
A completely insulated mixing vessel is designed to deliver water at 60 ⁰Cand atmospheric pressure at a rate of 4 kg/s by mixing two streams of incomingwater in an environment at 25 ⁰C. Saturated steam at atmospheric pressure isinserted on the hot side. Two options are being considered for the cold side: (a)chilled water from the plant at 3 ⁰C or (b) water from the tap at 20 ⁰C (both atatmospheric pressure).(i) Determine the mass flow rate of steam and chilled water in each case.(ii) Determine the thermal efficiency of each process.(iii) Determine the exergetic efficiency of each process, defined here as exergy outdivided by exergy in.(iv) Based on the previous answers, discuss which process makes better use ofavailable resources and why.
R-134a in saturated liquid form at -16 degree in an ice machine is evaporated to atmosphericpressure and ensured to freeze at 0 degree. R-134a is leaving from the evaporator as saturated vaporis known. The device produces ice at a flow rate of 2000 kg / h and a temperature of 0 degree. Calculate the entropy generation rate.
Problem 1 During the isothermal heat addition process of a Carnot cycle, 2000 kJ of heat is added to the working fluid from a source at 500°C. Determine: The entropy change of the working fluid. The entropy change of the source. The total entropy change for the process. Use the answer in part (c) to determine if under the given conditions the process is reversible. Explain why.
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
Consider the conditions of Problem 1, homework 5 (it is repeated below) and that the surroundings are at a temperature of 4 C. Instead of mixing the two fluids together consider the following proposal. Heat is allowed to flow from the 3 Kg mass of water through a Carnot heat engine and is rejected to the cooler mass which acts as the low temperature thermal reservoir. Determine the maximum amount of work that could be performed by the heat engine, the entropy produced, and the exergy destroyed in the 3 Kg mass during this operation. Also, determine the total entropy produced and exergy destroyed in the total system. In this case the temperature and internal energy of the mass of water is changing unlike the infinite heat reservoir case. Since the temperature of both the high temperature and low temperature heat input is changing, the Carnot efficiency is also changing. This problem should be solved using a numerical technique that you write using either excel or Matlab. In…
Liquid water at 325 K and 8000 kPa flows into a boiler at a rate of 10 kg-s-¹ and is vaporized, producing saturated vapor at 8000 kPa. What is the maximum fraction of the heat added to the water in the boiler that can be converted into work in a process whose product is water at the initial conditions, if To = 300 K? What happens to the rest of the heat? What is the rate of entropy change in the surroundings as a result of the work-producing process? In the system? Total?

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