The following observations were made during a boiler trial:

Calculate

(a) equivalent evaporation per \(\mathrm{kg}\) of fuel per \(\mathrm{m}^{2}\) of heating surface area per hour,

(b) boiler efficiency, and

(c) draw the heat balance sheet on \(1 \mathrm{~kg}\) of fuel basis.
Take the partial pressure of steam in exhaust gases \(=0.07\) bar.

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Mass of feed water and its temperature Steam pressure = 640 kg/h, 50C 10 bar Fuel burnt = 55 kg/h H.C.V. of fuel = 44,100 kJ/kg = = 30C Temperature of flue gases = 300C Boiler house temperature Dryness fraction of steam Heating surface of boiler Specific heat for flue gases Specific heat for superheated steam Composition of liquid fuel used by mass: 0.97 = 18.6 m - = 1.1 kJ/kg.K = 2.1 kJ/kg.K C=85%, H = 13%, ash = 2% The flue gas analysis by volume done by using or set apparatus: CO = 12.5%, O2 = 4.5%, N = 83%