[Ans. 72.2.54.43%; 84.1%]9. The following particulars were recorded during a steam boiler trial:Pressure of steam 11 bar; Mass of feed water = 4600 kg/h; Temperature of feed water= 75° C;Dryness fraction of steam 0.96; Coal used = 490 kg/h: Calorific value of coal = 35 700 kJ/kg; Moisture incoal = 4% by mass; Mass of dry flue gases = 18.57 kg/kg of coal ; Temperature of flue gases = 300" C; Boilerhouse temperature 16" C; Spccific heat of flue gases 0.97 kJ/kg K.%3D%3D%3D%3DDraw the heat balance sheet of the boiler per kg of coal.

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9. The following particulars were recorded during a steam boiler trial : Pressure of steam = 11 bar; Mass of feed water = 4600kg/h; Temperature of feed water 7Sº C ;Dryness fraction of steam 0.96; Coal used = 490 kg/h: Calorific value of coal = 35 700 KJK ; Moisture in coal = 4% by mass; Mass of dry flue gases = 18.57 kg/kg of coal; Temperature of flue gases 300"C; Boiler house temperature = 16" C; Spccific heat of flue gases 0.97 kJ/kg K. %3D Draw the heat balance sheet of the boiler per kg of coal.

9. The following particulars were recorded during a steam boiler trial : Pressure of steam = 11 bar; Mass of feed water = 4600kg/h; Temperature of feed water 7Sº C ;Dryness fraction of steam 0.96; Coal used = 490 kg/h: Calorific value of coal = 35 700 KJK ; Moisture in coal = 4% by mass; Mass of dry flue gases = 18.57 kg/kg of coal; Temperature of flue gases 300"C; Boiler house temperature = 16" C; Spccific heat of flue gases 0.97 kJ/kg K. %3D Draw the heat balance sheet of the boiler per kg of coal.

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

[Ans. 72.2.
54.43%; 84.1%]
9. The following particulars were recorded during a steam boiler trial:
Pressure of steam 11 bar; Mass of feed water = 4600 kg/h; Temperature of feed water= 75° C
;Dryness fraction of steam 0.96; Coal used = 490 kg/h: Calorific value of coal = 35 700 kJ/kg; Moisture in
coal = 4% by mass; Mass of dry flue gases = 18.57 kg/kg of coal ; Temperature of flue gases = 300" C; Boiler
house temperature 16" C; Spccific heat of flue gases 0.97 kJ/kg K.
%3D
%3D
%3D
%3D
Draw the heat balance sheet of the boiler per kg of coal.

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