i used efficiency = [generated steam * hfg] / [fuel consumed * CV ]
for efficiency i used 0.70, for generated steam 6250, hfg 1880, CV as 45000
and i found for the fuel consumed
Homework Statement
A boiler is to produce 6250 kg/h of steam superheated by 40 oC at a pressure of 2.1 MN/m2. The temperature of the feedwater is 50 oC. If the thermal efficiency of the boiler is 70%, how much fuel oil will be consumed in one hour? The calorific value of the fuel oil used is...