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The following data were obtained in a boiler trail:
Mass and temperature of feed water: 680 kg/hr and 200C, Steam temperature and its pressure : 15bar and 3000C, Coal used and its calorific value: 98kg/hr and 26500kg/kg, Flue gas formed and its temperature at chimney: 18kg/kg of coal supplied and 3000C, Ash and unburnt coal in ash pit:
44kg/hr with 2200 kj/kg calorific value, Mean specific heat of flue gases and feed water: 1kj/kgK and 4.187 kj/kgK. If the ambient temperature in the boiler room is 280C, Evaluate the:
i) Boiler efficiency,
ii) Equivalent evaporation from and at 1000 C,
iii) Percentage heat unaccounted,
iv) Draught produced in mm of water column if the height of chimney in 50 m.
The maximum stress in each material: A copper tube of external diameter 60 mm and internal diameter 40 mm is closely fitted to a steel rod of 40 mm diameter to compose a compo
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