The following data refer to a boiler trial:

Calculate

(a) boiler efficiency,

(b) equivalent evaporation, and

(c) percentage heat unaccounted

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Feed water Feed water temperature Steam pressure Steam temperature Coal burnt C.V. of coal = 700 kg/h = 25C = = 15 bar = 300C = 90 kg = 30,500 kJ/kg Ash and unburnt coal in ash pit = 4 kg/h with C.V. = 2200 kJ/kg Flue gas formed Flue gas temperature at chimney Ambient temperature Mean specific heat of flue gases 20 kg/kg of coal burnt = 300C = 30C = 1.025 kJ/kg.K