A boiler is supplied with 15, 900 kg of feed water at1 5°C, during a trial period of 8 hours and 20 minutes. At the end of the trial, the weight of water was 680 kg less than that of commencement of trial. The steam produced at the pressure of 12. 5 bar is 95% dry. The coal having the calorific value of 30,000 kJ/kg is fired at the rate of 275.8 kg/h. Calculate (a) actual evaporation rate, (b) equivalent evaporation, and (c) thermal efficiency of the boiler.

A boiler is supplied with 15, 900 kg of feed water at1 5°C, during a trial period of 8 hours and 20 minutes. At the end of the trial, the weight of water was 680 kg less than that of commencement of trial. The steam produced at the pressure of 12. 5 bar is 95% dry. The coal having the calorific value of 30,000 kJ/kg is fired at the rate of 275.8 kg/h. Calculate (a) actual evaporation rate, (b) equivalent evaporation, and (c) thermal efficiency of the boiler.

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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Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

A boiler is supplied with 15, 900 kg of feed
water at1 5°C, during a trial period of 8 hours
and 20 minutes. At the end of the trial, the
weight of water was 680 kg less than that of
commencement of trial. The steam produced at
the pressure of 12. 5 bar is 95% dry. The coal
having the calorific value of 30,000 kJ/kg is fired
at the rate of 275.8 kg/h. Calculate (a) actual
evaporation rate, (b) equivalent evaporation,
and (c) thermal efficiency of the boiler.

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